core/java/android/view/ViewRoot.java

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.view;

import com.android.internal.view.IInputMethodCallback;
import com.android.internal.view.IInputMethodSession;

import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.graphics.Point;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.graphics.Region;
import android.os.*;
import android.os.Process;
import android.os.SystemProperties;
import android.util.AndroidRuntimeException;
import android.util.Config;
import android.util.Log;
import android.util.EventLog;
import android.util.SparseArray;
import android.view.View.MeasureSpec;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;
import android.widget.Scroller;
import android.content.pm.PackageManager;
import android.content.Context;
import android.app.ActivityManagerNative;
import android.Manifest;
import android.media.AudioManager;

import java.lang.ref.WeakReference;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;

import javax.microedition.khronos.egl.*;
import javax.microedition.khronos.opengles.*;
import static javax.microedition.khronos.opengles.GL10.*;

/**
 * The top of a view hierarchy, implementing the needed protocol between View
 * and the WindowManager.  This is for the most part an internal implementation
 * detail of {@link WindowManagerImpl}.
 *
 * {@hide}
 */
@SuppressWarnings({"EmptyCatchBlock"})
public final class ViewRoot extends Handler implements ViewParent,
        View.AttachInfo.Callbacks {
    private static final String TAG = "ViewRoot";
    private static final boolean DBG = false;
    @SuppressWarnings({"ConstantConditionalExpression"})
    private static final boolean LOCAL_LOGV = false ? Config.LOGD : Config.LOGV;
    /** @noinspection PointlessBooleanExpression*/
    private static final boolean DEBUG_DRAW = false || LOCAL_LOGV;
    private static final boolean DEBUG_LAYOUT = false || LOCAL_LOGV;
    private static final boolean DEBUG_INPUT_RESIZE = false || LOCAL_LOGV;
    private static final boolean DEBUG_ORIENTATION = false || LOCAL_LOGV;
    private static final boolean DEBUG_TRACKBALL = false || LOCAL_LOGV;
    private static final boolean DEBUG_IMF = false || LOCAL_LOGV;
    private static final boolean WATCH_POINTER = false;

    /**
     * Maximum time we allow the user to roll the trackball enough to generate
     * a key event, before resetting the counters.
     */
    static final int MAX_TRACKBALL_DELAY = 250;

    static long sInstanceCount = 0;

    static IWindowSession sWindowSession;

    static final Object mStaticInit = new Object();
    static boolean mInitialized = false;

    static final ThreadLocal<RunQueue> sRunQueues = new ThreadLocal<RunQueue>();

    private static int sDrawTime;    

    long mLastTrackballTime = 0;
    final TrackballAxis mTrackballAxisX = new TrackballAxis();
    final TrackballAxis mTrackballAxisY = new TrackballAxis();

    final int[] mTmpLocation = new int[2];
    
    final InputMethodCallback mInputMethodCallback;
    final SparseArray<Object> mPendingEvents = new SparseArray<Object>();
    int mPendingEventSeq = 0;
    
    final Thread mThread;

    final WindowLeaked mLocation;

    final WindowManager.LayoutParams mWindowAttributes = new WindowManager.LayoutParams();

    final W mWindow;

    View mView;
    View mFocusedView;
    View mRealFocusedView;  // this is not set to null in touch mode
    int mViewVisibility;
    boolean mAppVisible = true;

    final Region mTransparentRegion;
    final Region mPreviousTransparentRegion;

    int mWidth;
    int mHeight;
    Rect mDirty; // will be a graphics.Region soon
    boolean mIsAnimating;
    // TODO: change these to scaler class.
    float mAppScale;
    float mAppScaleInverted; // = 1.0f / mAppScale

    final View.AttachInfo mAttachInfo;

    final Rect mTempRect; // used in the transaction to not thrash the heap.
    final Rect mVisRect; // used to retrieve visible rect of focused view.
    final Point mVisPoint; // used to retrieve global offset of focused view.

    boolean mTraversalScheduled;
    boolean mWillDrawSoon;
    boolean mLayoutRequested;
    boolean mFirst;
    boolean mReportNextDraw;
    boolean mFullRedrawNeeded;
    boolean mNewSurfaceNeeded;
    boolean mHasHadWindowFocus;
    boolean mLastWasImTarget;

    boolean mWindowAttributesChanged = false;

    // These can be accessed by any thread, must be protected with a lock.
    Surface mSurface;

    boolean mAdded;
    boolean mAddedTouchMode;

    /*package*/ int mAddNesting;

    // These are accessed by multiple threads.
    final Rect mWinFrame; // frame given by window manager.

    final Rect mPendingVisibleInsets = new Rect();
    final Rect mPendingContentInsets = new Rect();
    final ViewTreeObserver.InternalInsetsInfo mLastGivenInsets
            = new ViewTreeObserver.InternalInsetsInfo();

    boolean mScrollMayChange;
    int mSoftInputMode;
    View mLastScrolledFocus;
    int mScrollY;
    int mCurScrollY;
    Scroller mScroller;
    
    EGL10 mEgl;
    EGLDisplay mEglDisplay;
    EGLContext mEglContext;
    EGLSurface mEglSurface;
    GL11 mGL;
    Canvas mGlCanvas;
    boolean mUseGL;
    boolean mGlWanted;

    final ViewConfiguration mViewConfiguration;    

    /**
     * see {@link #playSoundEffect(int)}
     */
    AudioManager mAudioManager;

    private final float mDensity;

    public ViewRoot(Context context) {
        super();

        ++sInstanceCount;

        // Initialize the statics when this class is first instantiated. This is
        // done here instead of in the static block because Zygote does not
        // allow the spawning of threads.
        synchronized (mStaticInit) {
            if (!mInitialized) {
                try {
                    InputMethodManager imm = InputMethodManager.getInstance(context);
                    sWindowSession = IWindowManager.Stub.asInterface(
                            ServiceManager.getService("window"))
                            .openSession(imm.getClient(), imm.getInputContext());
                    mInitialized = true;
                } catch (RemoteException e) {
                }
            }
        }

        mThread = Thread.currentThread();
        mLocation = new WindowLeaked(null);
        mLocation.fillInStackTrace();
        mWidth = -1;
        mHeight = -1;
        mDirty = new Rect();
        mTempRect = new Rect();
        mVisRect = new Rect();
        mVisPoint = new Point();
        mWinFrame = new Rect();
        mWindow = new W(this, context);
        mInputMethodCallback = new InputMethodCallback(this);
        mViewVisibility = View.GONE;
        mTransparentRegion = new Region();
        mPreviousTransparentRegion = new Region();
        mFirst = true; // true for the first time the view is added
        mSurface = new Surface();
        mAdded = false;
        mAttachInfo = new View.AttachInfo(sWindowSession, mWindow, this, this);
        mViewConfiguration = ViewConfiguration.get(context);
        mDensity = context.getResources().getDisplayMetrics().density;
    }

    @Override
    protected void finalize() throws Throwable {
        super.finalize();
        --sInstanceCount;
    }

    public static long getInstanceCount() {
        return sInstanceCount;
    }

    // FIXME for perf testing only
    private boolean mProfile = false;

    /**
     * Call this to profile the next traversal call.
     * FIXME for perf testing only. Remove eventually
     */
    public void profile() {
        mProfile = true;
    }

    /**
     * Indicates whether we are in touch mode. Calling this method triggers an IPC
     * call and should be avoided whenever possible.
     *
     * @return True, if the device is in touch mode, false otherwise.
     *
     * @hide
     */
    static boolean isInTouchMode() {
        if (mInitialized) {
            try {
                return sWindowSession.getInTouchMode();
            } catch (RemoteException e) {
            }
        }
        return false;
    }

    private void initializeGL() {
        initializeGLInner();
        int err = mEgl.eglGetError();
        if (err != EGL10.EGL_SUCCESS) {
            // give-up on using GL
            destroyGL();
            mGlWanted = false;
        }
    }

    private void initializeGLInner() {
        final EGL10 egl = (EGL10) EGLContext.getEGL();
        mEgl = egl;

        /*
         * Get to the default display.
         */
        final EGLDisplay eglDisplay = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
        mEglDisplay = eglDisplay;

        /*
         * We can now initialize EGL for that display
         */
        int[] version = new int[2];
        egl.eglInitialize(eglDisplay, version);

        /*
         * Specify a configuration for our opengl session
         * and grab the first configuration that matches is
         */
        final int[] configSpec = {
                EGL10.EGL_RED_SIZE,      5,
                EGL10.EGL_GREEN_SIZE,    6,
                EGL10.EGL_BLUE_SIZE,     5,
                EGL10.EGL_DEPTH_SIZE,    0,
                EGL10.EGL_NONE
        };
        final EGLConfig[] configs = new EGLConfig[1];
        final int[] num_config = new int[1];
        egl.eglChooseConfig(eglDisplay, configSpec, configs, 1, num_config);
        final EGLConfig config = configs[0];

        /*
         * Create an OpenGL ES context. This must be done only once, an
         * OpenGL context is a somewhat heavy object.
         */
        final EGLContext context = egl.eglCreateContext(eglDisplay, config,
                EGL10.EGL_NO_CONTEXT, null);
        mEglContext = context;

        /*
         * Create an EGL surface we can render into.
         */
        final EGLSurface surface = egl.eglCreateWindowSurface(eglDisplay, config, mHolder, null);
        mEglSurface = surface;

        /*
         * Before we can issue GL commands, we need to make sure
         * the context is current and bound to a surface.
         */
        egl.eglMakeCurrent(eglDisplay, surface, surface, context);

        /*
         * Get to the appropriate GL interface.
         * This is simply done by casting the GL context to either
         * GL10 or GL11.
         */
        final GL11 gl = (GL11) context.getGL();
        mGL = gl;
        mGlCanvas = new Canvas(gl);
        mUseGL = true;
    }

    private void destroyGL() {
        // inform skia that the context is gone
        nativeAbandonGlCaches();

        mEgl.eglMakeCurrent(mEglDisplay, EGL10.EGL_NO_SURFACE,
                EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT);
        mEgl.eglDestroyContext(mEglDisplay, mEglContext);
        mEgl.eglDestroySurface(mEglDisplay, mEglSurface);
        mEgl.eglTerminate(mEglDisplay);
        mEglContext = null;
        mEglSurface = null;
        mEglDisplay = null;
        mEgl = null;
        mGlCanvas = null;
        mGL = null;
        mUseGL = false;
    }

    private void checkEglErrors() {
        if (mUseGL) {
            int err = mEgl.eglGetError();
            if (err != EGL10.EGL_SUCCESS) {
                // something bad has happened revert to
                // normal rendering.
                destroyGL();
                if (err != EGL11.EGL_CONTEXT_LOST) {
                    // we'll try again if it was context lost
                    mGlWanted = false;
                }
            }
        }
    }

    /**
     * We have one child
     */
    public void setView(View view, WindowManager.LayoutParams attrs,
            View panelParentView) {
        synchronized (this) {
            if (mView == null) {
                mView = view;
                mAppScale = mView.getContext().getApplicationScale();
                mAppScaleInverted = 1.0f / mAppScale;
                mWindowAttributes.copyFrom(attrs);
                mSoftInputMode = attrs.softInputMode;
                mWindowAttributesChanged = true;
                mAttachInfo.mRootView = view;
                if (panelParentView != null) {
                    mAttachInfo.mPanelParentWindowToken
                            = panelParentView.getApplicationWindowToken();
                }
                mAdded = true;
                int res; /* = WindowManagerImpl.ADD_OKAY; */
                
                // Schedule the first layout -before- adding to the window
                // manager, to make sure we do the relayout before receiving
                // any other events from the system.
                requestLayout();

                try {
                    res = sWindowSession.add(mWindow, attrs,
                            getHostVisibility(), mAttachInfo.mContentInsets);
                } catch (RemoteException e) {
                    mAdded = false;
                    mView = null;
                    mAttachInfo.mRootView = null;
                    unscheduleTraversals();
                    throw new RuntimeException("Adding window failed", e);
                }
                mAttachInfo.mContentInsets.scale(mAppScaleInverted);
                mPendingContentInsets.set(mAttachInfo.mContentInsets);
                mPendingVisibleInsets.set(0, 0, 0, 0);
                if (Config.LOGV) Log.v("ViewRoot", "Added window " + mWindow);
                if (res < WindowManagerImpl.ADD_OKAY) {
                    mView = null;
                    mAttachInfo.mRootView = null;
                    mAdded = false;
                    unscheduleTraversals();
                    switch (res) {
                        case WindowManagerImpl.ADD_BAD_APP_TOKEN:
                        case WindowManagerImpl.ADD_BAD_SUBWINDOW_TOKEN:
                            throw new WindowManagerImpl.BadTokenException(
                                "Unable to add window -- token " + attrs.token
                                + " is not valid; is your activity running?");
                        case WindowManagerImpl.ADD_NOT_APP_TOKEN:
                            throw new WindowManagerImpl.BadTokenException(
                                "Unable to add window -- token " + attrs.token
                                + " is not for an application");
                        case WindowManagerImpl.ADD_APP_EXITING:
                            throw new WindowManagerImpl.BadTokenException(
                                "Unable to add window -- app for token " + attrs.token
                                + " is exiting");
                        case WindowManagerImpl.ADD_DUPLICATE_ADD:
                            throw new WindowManagerImpl.BadTokenException(
                                "Unable to add window -- window " + mWindow
                                + " has already been added");
                        case WindowManagerImpl.ADD_STARTING_NOT_NEEDED:
                            // Silently ignore -- we would have just removed it
                            // right away, anyway.
                            return;
                        case WindowManagerImpl.ADD_MULTIPLE_SINGLETON:
                            throw new WindowManagerImpl.BadTokenException(
                                "Unable to add window " + mWindow +
                                " -- another window of this type already exists");
                        case WindowManagerImpl.ADD_PERMISSION_DENIED:
                            throw new WindowManagerImpl.BadTokenException(
                                "Unable to add window " + mWindow +
                                " -- permission denied for this window type");
                    }
                    throw new RuntimeException(
                        "Unable to add window -- unknown error code " + res);
                }
                view.assignParent(this);
                mAddedTouchMode = (res&WindowManagerImpl.ADD_FLAG_IN_TOUCH_MODE) != 0;
                mAppVisible = (res&WindowManagerImpl.ADD_FLAG_APP_VISIBLE) != 0;
            }
        }
    }

    public View getView() {
        return mView;
    }

    final WindowLeaked getLocation() {
        return mLocation;
    }

    void setLayoutParams(WindowManager.LayoutParams attrs, boolean newView) {
        synchronized (this) {
            int oldSoftInputMode = mWindowAttributes.softInputMode;
            mWindowAttributes.copyFrom(attrs);
            mWindowAttributes.scale(mAppScale);

            if (newView) {
                mSoftInputMode = attrs.softInputMode;
                requestLayout();
            }
            // Don't lose the mode we last auto-computed.
            if ((attrs.softInputMode&WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST)
                    == WindowManager.LayoutParams.SOFT_INPUT_ADJUST_UNSPECIFIED) {
                mWindowAttributes.softInputMode = (mWindowAttributes.softInputMode
                        & ~WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST)
                        | (oldSoftInputMode
                                & WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST);
            }
            mWindowAttributesChanged = true;
            scheduleTraversals();
        }
    }

    void handleAppVisibility(boolean visible) {
        if (mAppVisible != visible) {
            mAppVisible = visible;
            scheduleTraversals();
        }
    }

    void handleGetNewSurface() {
        mNewSurfaceNeeded = true;
        mFullRedrawNeeded = true;
        scheduleTraversals();
    }

    /**
     * {@inheritDoc}
     */
    public void requestLayout() {
        checkThread();
        mLayoutRequested = true;
        scheduleTraversals();
    }

    /**
     * {@inheritDoc}
     */
    public boolean isLayoutRequested() {
        return mLayoutRequested;
    }

    public void invalidateChild(View child, Rect dirty) {
        checkThread();
        if (LOCAL_LOGV) Log.v(TAG, "Invalidate child: " + dirty);
        if (mCurScrollY != 0 || mAppScale != 1.0f) {
            mTempRect.set(dirty);
            if (mCurScrollY != 0) {
               mTempRect.offset(0, -mCurScrollY);
            }
            if (mAppScale != 1.0f) {
                mTempRect.scale(mAppScale);
            }
            dirty = mTempRect;
        }
        // TODO: When doing a union with mDirty != empty, we must cancel all the DIRTY_OPAQUE flags
        mDirty.union(dirty);
        if (!mWillDrawSoon) {
            scheduleTraversals();
        }
    }

    public ViewParent getParent() {
        return null;
    }

    public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) {
        invalidateChild(null, dirty);
        return null;
    }

     public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) {
        if (child != mView) {
            throw new RuntimeException("child is not mine, honest!");
        }
        // Note: don't apply scroll offset, because we want to know its
        // visibility in the virtual canvas being given to the view hierarchy.
        return r.intersect(0, 0, mWidth, mHeight);
    }

    public void bringChildToFront(View child) {
    }

    public void scheduleTraversals() {
        if (!mTraversalScheduled) {
            mTraversalScheduled = true;
            sendEmptyMessage(DO_TRAVERSAL);
        }
    }

    public void unscheduleTraversals() {
        if (mTraversalScheduled) {
            mTraversalScheduled = false;
            removeMessages(DO_TRAVERSAL);
        }
    }

    int getHostVisibility() {
        return mAppVisible ? mView.getVisibility() : View.GONE;
    }
    
    private void performTraversals() {
        // cache mView since it is used so much below...
        final View host = mView;

        if (DBG) {
            System.out.println("======================================");
            System.out.println("performTraversals");
            host.debug();
        }

        if (host == null || !mAdded)
            return;

        mTraversalScheduled = false;
        mWillDrawSoon = true;
        boolean windowResizesToFitContent = false;
        boolean fullRedrawNeeded = mFullRedrawNeeded;
        boolean newSurface = false;
        WindowManager.LayoutParams lp = mWindowAttributes;

        int desiredWindowWidth;
        int desiredWindowHeight;
        int childWidthMeasureSpec;
        int childHeightMeasureSpec;

        final View.AttachInfo attachInfo = mAttachInfo;

        final int viewVisibility = getHostVisibility();
        boolean viewVisibilityChanged = mViewVisibility != viewVisibility
                || mNewSurfaceNeeded;

        WindowManager.LayoutParams params = null;
        if (mWindowAttributesChanged) {
            mWindowAttributesChanged = false;
            params = lp;
        }

        if (mFirst) {
            fullRedrawNeeded = true;
            mLayoutRequested = true;

            Display d = new Display(0);
            desiredWindowWidth = (int) (d.getWidth() * mAppScaleInverted);
            desiredWindowHeight = (int) (d.getHeight() * mAppScaleInverted);

            // For the very first time, tell the view hierarchy that it
            // is attached to the window.  Note that at this point the surface
            // object is not initialized to its backing store, but soon it
            // will be (assuming the window is visible).
            attachInfo.mSurface = mSurface;
            attachInfo.mHasWindowFocus = false;
            attachInfo.mWindowVisibility = viewVisibility;
            attachInfo.mRecomputeGlobalAttributes = false;
            attachInfo.mKeepScreenOn = false;
            viewVisibilityChanged = false;
            host.dispatchAttachedToWindow(attachInfo, 0);
            getRunQueue().executeActions(attachInfo.mHandler);
            //Log.i(TAG, "Screen on initialized: " + attachInfo.mKeepScreenOn);
        } else {
            desiredWindowWidth = mWinFrame.width();
            desiredWindowHeight = mWinFrame.height();
            if (desiredWindowWidth != mWidth || desiredWindowHeight != mHeight) {
                if (DEBUG_ORIENTATION) Log.v("ViewRoot",
                        "View " + host + " resized to: " + mWinFrame);
                fullRedrawNeeded = true;
                mLayoutRequested = true;
                windowResizesToFitContent = true;
            }
        }

        if (viewVisibilityChanged) {
            attachInfo.mWindowVisibility = viewVisibility;
            host.dispatchWindowVisibilityChanged(viewVisibility);
            if (viewVisibility != View.VISIBLE || mNewSurfaceNeeded) {
                if (mUseGL) {
                    destroyGL();
                }
            }
            if (viewVisibility == View.GONE) {
                // After making a window gone, we will count it as being
                // shown for the first time the next time it gets focus.
                mHasHadWindowFocus = false;
            }
        }

        boolean insetsChanged = false;
        
        if (mLayoutRequested) {
            if (mFirst) {
                host.fitSystemWindows(mAttachInfo.mContentInsets);
                // make sure touch mode code executes by setting cached value
                // to opposite of the added touch mode.
                mAttachInfo.mInTouchMode = !mAddedTouchMode;
                ensureTouchModeLocally(mAddedTouchMode);
            } else {
                if (!mAttachInfo.mContentInsets.equals(mPendingContentInsets)) {
                    mAttachInfo.mContentInsets.set(mPendingContentInsets);
                    host.fitSystemWindows(mAttachInfo.mContentInsets);
                    insetsChanged = true;
                    if (DEBUG_LAYOUT) Log.v(TAG, "Content insets changing to: "
                            + mAttachInfo.mContentInsets);
                }
                if (!mAttachInfo.mVisibleInsets.equals(mPendingVisibleInsets)) {
                    mAttachInfo.mVisibleInsets.set(mPendingVisibleInsets);
                    if (DEBUG_LAYOUT) Log.v(TAG, "Visible insets changing to: "
                            + mAttachInfo.mVisibleInsets);
                }
                if (lp.width == ViewGroup.LayoutParams.WRAP_CONTENT
                        || lp.height == ViewGroup.LayoutParams.WRAP_CONTENT) {
                    windowResizesToFitContent = true;

                    Display d = new Display(0);
                    desiredWindowWidth = (int) (d.getWidth() * mAppScaleInverted);
                    desiredWindowHeight = (int) (d.getHeight() * mAppScaleInverted);
                }
            }

            childWidthMeasureSpec = getRootMeasureSpec(desiredWindowWidth, lp.width);
            childHeightMeasureSpec = getRootMeasureSpec(desiredWindowHeight, lp.height);

            // Ask host how big it wants to be
            if (DEBUG_ORIENTATION || DEBUG_LAYOUT) Log.v("ViewRoot",
                    "Measuring " + host + " in display " + desiredWindowWidth
                    + "x" + desiredWindowHeight + "...");
            host.measure(childWidthMeasureSpec, childHeightMeasureSpec);

            if (DBG) {
                System.out.println("======================================");
                System.out.println("performTraversals -- after measure");
                host.debug();
            }
        }

        if (attachInfo.mRecomputeGlobalAttributes) {
            //Log.i(TAG, "Computing screen on!");
            attachInfo.mRecomputeGlobalAttributes = false;
            boolean oldVal = attachInfo.mKeepScreenOn;
            attachInfo.mKeepScreenOn = false;
            host.dispatchCollectViewAttributes(0);
            if (attachInfo.mKeepScreenOn != oldVal) {
                params = lp;
                //Log.i(TAG, "Keep screen on changed: " + attachInfo.mKeepScreenOn);
            }
        }

        if (mFirst || attachInfo.mViewVisibilityChanged) {
            attachInfo.mViewVisibilityChanged = false;
            int resizeMode = mSoftInputMode &
                    WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST;
            // If we are in auto resize mode, then we need to determine
            // what mode to use now.
            if (resizeMode == WindowManager.LayoutParams.SOFT_INPUT_ADJUST_UNSPECIFIED) {
                final int N = attachInfo.mScrollContainers.size();
                for (int i=0; i<N; i++) {
                    if (attachInfo.mScrollContainers.get(i).isShown()) {
                        resizeMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE;
                    }
                }
                if (resizeMode == 0) {
                    resizeMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN;
                }
                if ((lp.softInputMode &
                        WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST) != resizeMode) {
                    lp.softInputMode = (lp.softInputMode &
                            ~WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST) |
                            resizeMode;
                    params = lp;
                }
            }
        }
        
        if (params != null && (host.mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) != 0) {
            if (!PixelFormat.formatHasAlpha(params.format)) {
                params.format = PixelFormat.TRANSLUCENT;
            }
        }

        boolean windowShouldResize = mLayoutRequested && windowResizesToFitContent
            && (mWidth != host.mMeasuredWidth || mHeight != host.mMeasuredHeight);

        final boolean computesInternalInsets =
                attachInfo.mTreeObserver.hasComputeInternalInsetsListeners();
        boolean insetsPending = false;
        int relayoutResult = 0;
        if (mFirst || windowShouldResize || insetsChanged
                || viewVisibilityChanged || params != null) {

            if (viewVisibility == View.VISIBLE) {
                // If this window is giving internal insets to the window
                // manager, and it is being added or changing its visibility,
                // then we want to first give the window manager "fake"
                // insets to cause it to effectively ignore the content of
                // the window during layout.  This avoids it briefly causing
                // other windows to resize/move based on the raw frame of the
                // window, waiting until we can finish laying out this window
                // and get back to the window manager with the ultimately
                // computed insets.
                insetsPending = computesInternalInsets
                        && (mFirst || viewVisibilityChanged);
                
                if (mWindowAttributes.memoryType == WindowManager.LayoutParams.MEMORY_TYPE_GPU) {
                    if (params == null) {
                        params = mWindowAttributes;
                    }
                    mGlWanted = true;
                }
            }

            final Rect frame = mWinFrame;
            boolean initialized = false;
            boolean contentInsetsChanged = false;
            boolean visibleInsetsChanged;
            try {
                boolean hadSurface = mSurface.isValid();
                int fl = 0;
                if (params != null) {
                    fl = params.flags;
                    if (attachInfo.mKeepScreenOn) {
                        params.flags |= WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
                    }
                }
                if (DEBUG_LAYOUT) {
                    Log.i(TAG, "host=w:" + host.mMeasuredWidth + ", h:" +
                            host.mMeasuredHeight + ", params=" + params);
                }
                relayoutResult = relayoutWindow(params, viewVisibility, insetsPending);

                if (params != null) {
                    params.flags = fl;
                }

                if (DEBUG_LAYOUT) Log.v(TAG, "relayout: frame=" + frame.toShortString()
                        + " content=" + mPendingContentInsets.toShortString()
                        + " visible=" + mPendingVisibleInsets.toShortString()
                        + " surface=" + mSurface);
                
                contentInsetsChanged = !mPendingContentInsets.equals(
                        mAttachInfo.mContentInsets);
                visibleInsetsChanged = !mPendingVisibleInsets.equals(
                        mAttachInfo.mVisibleInsets);
                if (contentInsetsChanged) {
                    mAttachInfo.mContentInsets.set(mPendingContentInsets);
                    host.fitSystemWindows(mAttachInfo.mContentInsets);
                    if (DEBUG_LAYOUT) Log.v(TAG, "Content insets changing to: "
                            + mAttachInfo.mContentInsets);
                }
                if (visibleInsetsChanged) {
                    mAttachInfo.mVisibleInsets.set(mPendingVisibleInsets);
                    if (DEBUG_LAYOUT) Log.v(TAG, "Visible insets changing to: "
                            + mAttachInfo.mVisibleInsets);
                }

                if (!hadSurface) {
                    if (mSurface.isValid()) {
                        // If we are creating a new surface, then we need to
                        // completely redraw it.  Also, when we get to the
                        // point of drawing it we will hold off and schedule
                        // a new traversal instead.  This is so we can tell the
                        // window manager about all of the windows being displayed
                        // before actually drawing them, so it can display then
                        // all at once.
                        newSurface = true;
                        fullRedrawNeeded = true;
    
                        if (mGlWanted && !mUseGL) {
                            initializeGL();
                            initialized = mGlCanvas != null;
                        }
                    }
                } else if (!mSurface.isValid()) {
                    // If the surface has been removed, then reset the scroll
                    // positions.
                    mLastScrolledFocus = null;
                    mScrollY = mCurScrollY = 0;
                    if (mScroller != null) {
                        mScroller.abortAnimation();
                    }
                }
            } catch (RemoteException e) {
            }
            if (DEBUG_ORIENTATION) Log.v(
                    "ViewRoot", "Relayout returned: frame=" + mWinFrame + ", surface=" + mSurface);

            attachInfo.mWindowLeft = frame.left;
            attachInfo.mWindowTop = frame.top;

            // !!FIXME!! This next section handles the case where we did not get the
            // window size we asked for. We should avoid this by getting a maximum size from
            // the window session beforehand.
            mWidth = frame.width();
            mHeight = frame.height();

            if (initialized) {
                mGlCanvas.setViewport((int) (mWidth * mAppScale), (int) (mHeight * mAppScale));
            }

            boolean focusChangedDueToTouchMode = ensureTouchModeLocally(
                    (relayoutResult&WindowManagerImpl.RELAYOUT_IN_TOUCH_MODE) != 0);
            if (focusChangedDueToTouchMode || mWidth != host.mMeasuredWidth
                    || mHeight != host.mMeasuredHeight || contentInsetsChanged) {
                childWidthMeasureSpec = getRootMeasureSpec(mWidth, lp.width);
                childHeightMeasureSpec = getRootMeasureSpec(mHeight, lp.height);

                if (DEBUG_LAYOUT) Log.v(TAG, "Ooops, something changed!  mWidth="
                        + mWidth + " measuredWidth=" + host.mMeasuredWidth
                        + " mHeight=" + mHeight
                        + " measuredHeight" + host.mMeasuredHeight
                        + " coveredInsetsChanged=" + contentInsetsChanged);
                
                 // Ask host how big it wants to be
                host.measure(childWidthMeasureSpec, childHeightMeasureSpec);

                // Implementation of weights from WindowManager.LayoutParams
                // We just grow the dimensions as needed and re-measure if
                // needs be
                int width = host.mMeasuredWidth;
                int height = host.mMeasuredHeight;
                boolean measureAgain = false;

                if (lp.horizontalWeight > 0.0f) {
                    width += (int) ((mWidth - width) * lp.horizontalWeight);
                    childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width,
                            MeasureSpec.EXACTLY);
                    measureAgain = true;
                }
                if (lp.verticalWeight > 0.0f) {
                    height += (int) ((mHeight - height) * lp.verticalWeight);
                    childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height,
                            MeasureSpec.EXACTLY);
                    measureAgain = true;
                }

                if (measureAgain) {
                    if (DEBUG_LAYOUT) Log.v(TAG,
                            "And hey let's measure once more: width=" + width
                            + " height=" + height);
                    host.measure(childWidthMeasureSpec, childHeightMeasureSpec);
                }

                mLayoutRequested = true;
            }
        }

        final boolean didLayout = mLayoutRequested;
        boolean triggerGlobalLayoutListener = didLayout
                || attachInfo.mRecomputeGlobalAttributes;
        if (didLayout) {
            mLayoutRequested = false;
            mScrollMayChange = true;
            if (DEBUG_ORIENTATION || DEBUG_LAYOUT) Log.v(
                "ViewRoot", "Laying out " + host + " to (" +
                host.mMeasuredWidth + ", " + host.mMeasuredHeight + ")");
            long startTime = 0L;
            if (Config.DEBUG && ViewDebug.profileLayout) {
                startTime = SystemClock.elapsedRealtime();
            }

            host.layout(0, 0, host.mMeasuredWidth, host.mMeasuredHeight);

            if (Config.DEBUG && ViewDebug.consistencyCheckEnabled) {
                if (!host.dispatchConsistencyCheck(ViewDebug.CONSISTENCY_LAYOUT)) {
                    throw new IllegalStateException("The view hierarchy is an inconsistent state,"
                            + "please refer to the logs with the tag "
                            + ViewDebug.CONSISTENCY_LOG_TAG + " for more infomation.");
                }
            }

            if (Config.DEBUG && ViewDebug.profileLayout) {
                EventLog.writeEvent(60001, SystemClock.elapsedRealtime() - startTime);
            }

            // By this point all views have been sized and positionned
            // We can compute the transparent area

            if ((host.mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) != 0) {
                // start out transparent
                // TODO: AVOID THAT CALL BY CACHING THE RESULT?
                host.getLocationInWindow(mTmpLocation);
                mTransparentRegion.set(mTmpLocation[0], mTmpLocation[1],
                        mTmpLocation[0] + host.mRight - host.mLeft,
                        mTmpLocation[1] + host.mBottom - host.mTop);

                host.gatherTransparentRegion(mTransparentRegion);

                // TODO: scale the region, like:
                // Region uses native methods. We probabl should have ScalableRegion class.

                // Region does not have equals method ?
                if (!mTransparentRegion.equals(mPreviousTransparentRegion)) {
                    mPreviousTransparentRegion.set(mTransparentRegion);
                    // reconfigure window manager
                    try {
                        sWindowSession.setTransparentRegion(mWindow, mTransparentRegion);
                    } catch (RemoteException e) {
                    }
                }
            }


            if (DBG) {
                System.out.println("======================================");
                System.out.println("performTraversals -- after setFrame");
                host.debug();
            }
        }

        if (triggerGlobalLayoutListener) {
            attachInfo.mRecomputeGlobalAttributes = false;
            attachInfo.mTreeObserver.dispatchOnGlobalLayout();
        }

        if (computesInternalInsets) {
            ViewTreeObserver.InternalInsetsInfo insets = attachInfo.mGivenInternalInsets;
            final Rect givenContent = attachInfo.mGivenInternalInsets.contentInsets;
            final Rect givenVisible = attachInfo.mGivenInternalInsets.visibleInsets;
            givenContent.left = givenContent.top = givenContent.right
                    = givenContent.bottom = givenVisible.left = givenVisible.top
                    = givenVisible.right = givenVisible.bottom = 0;
            insets.contentInsets.scale(mAppScale);
            insets.visibleInsets.scale(mAppScale);

            attachInfo.mTreeObserver.dispatchOnComputeInternalInsets(insets);
            if (insetsPending || !mLastGivenInsets.equals(insets)) {
                mLastGivenInsets.set(insets);
                try {
                    sWindowSession.setInsets(mWindow, insets.mTouchableInsets,
                            insets.contentInsets, insets.visibleInsets);
                } catch (RemoteException e) {
                }
            }
        }
            
        if (mFirst) {
            // handle first focus request
            if (DEBUG_INPUT_RESIZE) Log.v(TAG, "First: mView.hasFocus()="
                    + mView.hasFocus());
            if (mView != null) {
                if (!mView.hasFocus()) {
                    mView.requestFocus(View.FOCUS_FORWARD);
                    mFocusedView = mRealFocusedView = mView.findFocus();
                    if (DEBUG_INPUT_RESIZE) Log.v(TAG, "First: requested focused view="
                            + mFocusedView);
                } else {
                    mRealFocusedView = mView.findFocus();
                    if (DEBUG_INPUT_RESIZE) Log.v(TAG, "First: existing focused view="
                            + mRealFocusedView);
                }
            }
        }

        mFirst = false;
        mWillDrawSoon = false;
        mNewSurfaceNeeded = false;
        mViewVisibility = viewVisibility;

        if (mAttachInfo.mHasWindowFocus) {
            final boolean imTarget = WindowManager.LayoutParams
                    .mayUseInputMethod(mWindowAttributes.flags);
            if (imTarget != mLastWasImTarget) {
                mLastWasImTarget = imTarget;
                InputMethodManager imm = InputMethodManager.peekInstance();
                if (imm != null && imTarget) {
                    imm.startGettingWindowFocus(mView);
                    imm.onWindowFocus(mView, mView.findFocus(),
                            mWindowAttributes.softInputMode,
                            !mHasHadWindowFocus, mWindowAttributes.flags);
                }
            }
        }
        
        boolean cancelDraw = attachInfo.mTreeObserver.dispatchOnPreDraw();

        if (!cancelDraw && !newSurface) {
            mFullRedrawNeeded = false;
            draw(fullRedrawNeeded);

            if ((relayoutResult&WindowManagerImpl.RELAYOUT_FIRST_TIME) != 0
                    || mReportNextDraw) {
                if (LOCAL_LOGV) {
                    Log.v("ViewRoot", "FINISHED DRAWING: " + mWindowAttributes.getTitle());
                }
                mReportNextDraw = false;
                try {
                    sWindowSession.finishDrawing(mWindow);
                } catch (RemoteException e) {
                }
            }
        } else {
            // We were supposed to report when we are done drawing. Since we canceled the
            // draw, remember it here.
            if ((relayoutResult&WindowManagerImpl.RELAYOUT_FIRST_TIME) != 0) {
                mReportNextDraw = true;
            }
            if (fullRedrawNeeded) {
                mFullRedrawNeeded = true;
            }
            // Try again
            scheduleTraversals();
        }
    }

    public void requestTransparentRegion(View child) {
        // the test below should not fail unless someone is messing with us
        checkThread();
        if (mView == child) {
            mView.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS;
            // Need to make sure we re-evaluate the window attributes next
            // time around, to ensure the window has the correct format.
            mWindowAttributesChanged = true;
        }
    }

    /**
     * Figures out the measure spec for the root view in a window based on it's
     * layout params.
     *
     * @param windowSize
     *            The available width or height of the window
     *
     * @param rootDimension
     *            The layout params for one dimension (width or height) of the
     *            window.
     *
     * @return The measure spec to use to measure the root view.
     */
    private int getRootMeasureSpec(int windowSize, int rootDimension) {
        int measureSpec;
        switch (rootDimension) {

        case ViewGroup.LayoutParams.FILL_PARENT:
            // Window can't resize. Force root view to be windowSize.
            measureSpec = MeasureSpec.makeMeasureSpec(windowSize, MeasureSpec.EXACTLY);
            break;
        case ViewGroup.LayoutParams.WRAP_CONTENT:
            // Window can resize. Set max size for root view.
            measureSpec = MeasureSpec.makeMeasureSpec(windowSize, MeasureSpec.AT_MOST);
            break;
        default:
            // Window wants to be an exact size. Force root view to be that size.
            measureSpec = MeasureSpec.makeMeasureSpec(rootDimension, MeasureSpec.EXACTLY);
            break;
        }
        return measureSpec;
    }

    private void draw(boolean fullRedrawNeeded) {
        Surface surface = mSurface;
        if (surface == null || !surface.isValid()) {
            return;
        }

        scrollToRectOrFocus(null, false);

        if (mAttachInfo.mViewScrollChanged) {
            mAttachInfo.mViewScrollChanged = false;
            mAttachInfo.mTreeObserver.dispatchOnScrollChanged();
        }
        
        int yoff;
        final boolean scrolling = mScroller != null
                && mScroller.computeScrollOffset();
        if (scrolling) {
            yoff = mScroller.getCurrY();
        } else {
            yoff = mScrollY;
        }
        if (mCurScrollY != yoff) {
            mCurScrollY = yoff;
            fullRedrawNeeded = true;
        }

        Rect dirty = mDirty;
        if (mUseGL) {
            if (!dirty.isEmpty()) {
                Canvas canvas = mGlCanvas;
                if (mGL!=null && canvas != null) {
                    mGL.glDisable(GL_SCISSOR_TEST);
                    mGL.glClearColor(0, 0, 0, 0);
                    mGL.glClear(GL_COLOR_BUFFER_BIT);
                    mGL.glEnable(GL_SCISSOR_TEST);

                    mAttachInfo.mDrawingTime = SystemClock.uptimeMillis();
                    mView.mPrivateFlags |= View.DRAWN;

                    float scale = mAppScale;
                    int saveCount = canvas.save(Canvas.MATRIX_SAVE_FLAG);
                    try {
                        canvas.translate(0, -yoff);
                        if (scale != 1.0f) {
                            canvas.scale(scale, scale);
                        }
                        mView.draw(canvas);
                        if (Config.DEBUG && ViewDebug.consistencyCheckEnabled) {
                            mView.dispatchConsistencyCheck(ViewDebug.CONSISTENCY_DRAWING);
                        }
                    } finally {
                        canvas.restoreToCount(saveCount);
                    }

                    mEgl.eglSwapBuffers(mEglDisplay, mEglSurface);
                    checkEglErrors();

                    if (Config.DEBUG && ViewDebug.showFps) {
                        int now = (int)SystemClock.elapsedRealtime();
                        if (sDrawTime != 0) {
                            nativeShowFPS(canvas, now - sDrawTime);
                        }
                        sDrawTime = now;
                    }
                }
            }
            if (scrolling) {
                mFullRedrawNeeded = true;
                scheduleTraversals();
            }
            return;
        }

        if (fullRedrawNeeded)
            dirty.union(0, 0, (int) (mWidth * mAppScale), (int) (mHeight * mAppScale));

        if (DEBUG_ORIENTATION || DEBUG_DRAW) {
            Log.v("ViewRoot", "Draw " + mView + "/"
                    + mWindowAttributes.getTitle()
                    + ": dirty={" + dirty.left + "," + dirty.top
                    + "," + dirty.right + "," + dirty.bottom + "} surface="
                    + surface + " surface.isValid()=" + surface.isValid());
        }

        Canvas canvas;
        try {
            canvas = surface.lockCanvas(dirty);
            // TODO: Do this in native
            canvas.setDensityScale(mDensity);
        } catch (Surface.OutOfResourcesException e) {
            Log.e("ViewRoot", "OutOfResourcesException locking surface", e);
            // TODO: we should ask the window manager to do something!
            // for now we just do nothing
            return;
        }

        try {
            if (!dirty.isEmpty() || mIsAnimating) {
                long startTime = 0L;

                if (DEBUG_ORIENTATION || DEBUG_DRAW) {
                    Log.v("ViewRoot", "Surface " + surface + " drawing to bitmap w="
                            + canvas.getWidth() + ", h=" + canvas.getHeight());
                    //canvas.drawARGB(255, 255, 0, 0);
                }

                if (Config.DEBUG && ViewDebug.profileDrawing) {
                    startTime = SystemClock.elapsedRealtime();
                }

                // If this bitmap's format includes an alpha channel, we
                // need to clear it before drawing so that the child will
                // properly re-composite its drawing on a transparent
                // background. This automatically respects the clip/dirty region
                if (!canvas.isOpaque()) {
                    canvas.drawColor(0x00000000, PorterDuff.Mode.CLEAR);
                } else if (yoff != 0) {
                    // If we are applying an offset, we need to clear the area
                    // where the offset doesn't appear to avoid having garbage
                    // left in the blank areas.
                    canvas.drawColor(0, PorterDuff.Mode.CLEAR);
                }

                dirty.setEmpty();
                mIsAnimating = false;
                mAttachInfo.mDrawingTime = SystemClock.uptimeMillis();
                mView.mPrivateFlags |= View.DRAWN;

                float scale = mAppScale;
                Context cxt = mView.getContext();
                if (DEBUG_DRAW) {
                    Log.i(TAG, "Drawing: package:" + cxt.getPackageName() + ", appScale=" + mAppScale);
                }
                int saveCount =  canvas.save(Canvas.MATRIX_SAVE_FLAG);
                try {
                    canvas.translate(0, -yoff);
                    if (scale != 1.0f) {
                        // re-scale this
                        canvas.scale(scale, scale);
                    }
                    mView.draw(canvas);

                    if (Config.DEBUG && ViewDebug.consistencyCheckEnabled) {
                        mView.dispatchConsistencyCheck(ViewDebug.CONSISTENCY_DRAWING);
                    }
                } finally {
                    canvas.restoreToCount(saveCount);
                }

                if (Config.DEBUG && ViewDebug.showFps) {
                    int now = (int)SystemClock.elapsedRealtime();
                    if (sDrawTime != 0) {
                        nativeShowFPS(canvas, now - sDrawTime);
                    }
                    sDrawTime = now;
                }

                if (Config.DEBUG && ViewDebug.profileDrawing) {
                    EventLog.writeEvent(60000, SystemClock.elapsedRealtime() - startTime);
                }
            }
            
        } finally {
            surface.unlockCanvasAndPost(canvas);
        }

        if (LOCAL_LOGV) {
            Log.v("ViewRoot", "Surface " + surface + " unlockCanvasAndPost");
        }
        
        if (scrolling) {
            mFullRedrawNeeded = true;
            scheduleTraversals();
        }
    }

    boolean scrollToRectOrFocus(Rect rectangle, boolean immediate) {
        final View.AttachInfo attachInfo = mAttachInfo;
        final Rect ci = attachInfo.mContentInsets;
        final Rect vi = attachInfo.mVisibleInsets;
        int scrollY = 0;
        boolean handled = false;
        
        if (vi.left > ci.left || vi.top > ci.top
                || vi.right > ci.right || vi.bottom > ci.bottom) {
            // We'll assume that we aren't going to change the scroll
            // offset, since we want to avoid that unless it is actually
            // going to make the focus visible...  otherwise we scroll
            // all over the place.
            scrollY = mScrollY;
            // We can be called for two different situations: during a draw,
            // to update the scroll position if the focus has changed (in which
            // case 'rectangle' is null), or in response to a
            // requestChildRectangleOnScreen() call (in which case 'rectangle'
            // is non-null and we just want to scroll to whatever that
            // rectangle is).
            View focus = mRealFocusedView;
            if (focus != mLastScrolledFocus) {
                // If the focus has changed, then ignore any requests to scroll
                // to a rectangle; first we want to make sure the entire focus
                // view is visible.
                rectangle = null;
            }
            if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Eval scroll: focus=" + focus
                    + " rectangle=" + rectangle + " ci=" + ci
                    + " vi=" + vi);
            if (focus == mLastScrolledFocus && !mScrollMayChange
                    && rectangle == null) {
                // Optimization: if the focus hasn't changed since last
                // time, and no layout has happened, then just leave things
                // as they are.
                if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Keeping scroll y="
                        + mScrollY + " vi=" + vi.toShortString());
            } else if (focus != null) {
                // We need to determine if the currently focused view is
                // within the visible part of the window and, if not, apply
                // a pan so it can be seen.
                mLastScrolledFocus = focus;
                mScrollMayChange = false;
                if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Need to scroll?");
                // Try to find the rectangle from the focus view.
                if (focus.getGlobalVisibleRect(mVisRect, null)) {
                    if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Root w="
                            + mView.getWidth() + " h=" + mView.getHeight()
                            + " ci=" + ci.toShortString()
                            + " vi=" + vi.toShortString());
                    if (rectangle == null) {
                        focus.getFocusedRect(mTempRect);
                        if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Focus " + focus
                                + ": focusRect=" + mTempRect.toShortString());
                        ((ViewGroup) mView).offsetDescendantRectToMyCoords(
                                focus, mTempRect);
                        if (DEBUG_INPUT_RESIZE) Log.v(TAG,
                                "Focus in window: focusRect="
                                + mTempRect.toShortString()
                                + " visRect=" + mVisRect.toShortString());
                    } else {
                        mTempRect.set(rectangle);
                        if (DEBUG_INPUT_RESIZE) Log.v(TAG,
                                "Request scroll to rect: "
                                + mTempRect.toShortString()
                                + " visRect=" + mVisRect.toShortString());
                    }
                    if (mTempRect.intersect(mVisRect)) {
                        if (DEBUG_INPUT_RESIZE) Log.v(TAG,
                                "Focus window visible rect: "
                                + mTempRect.toShortString());
                        if (mTempRect.height() >
                                (mView.getHeight()-vi.top-vi.bottom)) {
                            // If the focus simply is not going to fit, then
                            // best is probably just to leave things as-is.
                            if (DEBUG_INPUT_RESIZE) Log.v(TAG,
                                    "Too tall; leaving scrollY=" + scrollY);
                        } else if ((mTempRect.top-scrollY) < vi.top) {
                            scrollY -= vi.top - (mTempRect.top-scrollY);
                            if (DEBUG_INPUT_RESIZE) Log.v(TAG,
                                    "Top covered; scrollY=" + scrollY);
                        } else if ((mTempRect.bottom-scrollY)
                                > (mView.getHeight()-vi.bottom)) {
                            scrollY += (mTempRect.bottom-scrollY)
                                    - (mView.getHeight()-vi.bottom);
                            if (DEBUG_INPUT_RESIZE) Log.v(TAG,
                                    "Bottom covered; scrollY=" + scrollY);
                        }
                        handled = true;
                    }
                }
            }
        }
        
        if (scrollY != mScrollY) {
            if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Pan scroll changed: old="
                    + mScrollY + " , new=" + scrollY);
            if (!immediate) {
                if (mScroller == null) {
                    mScroller = new Scroller(mView.getContext());
                }
                mScroller.startScroll(0, mScrollY, 0, scrollY-mScrollY);
            } else if (mScroller != null) {
                mScroller.abortAnimation();
            }
            mScrollY = scrollY;
        }
        
        return handled;
    }
    
    public void requestChildFocus(View child, View focused) {
        checkThread();
        if (mFocusedView != focused) {
            mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(mFocusedView, focused);
            scheduleTraversals();
        }
        mFocusedView = mRealFocusedView = focused;
        if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Request child focus: focus now "
                + mFocusedView);
    }

    public void clearChildFocus(View child) {
        checkThread();

        View oldFocus = mFocusedView;

        if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Clearing child focus");
        mFocusedView = mRealFocusedView = null;
        if (mView != null && !mView.hasFocus()) {
            // If a view gets the focus, the listener will be invoked from requestChildFocus()
            if (!mView.requestFocus(View.FOCUS_FORWARD)) {
                mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null);
            }
        } else if (oldFocus != null) {
            mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null);
        }
    }


    public void focusableViewAvailable(View v) {
        checkThread();

        if (mView != null && !mView.hasFocus()) {
            v.requestFocus();
        } else {
            // the one case where will transfer focus away from the current one
            // is if the current view is a view group that prefers to give focus
            // to its children first AND the view is a descendant of it.
            mFocusedView = mView.findFocus();
            boolean descendantsHaveDibsOnFocus =
                    (mFocusedView instanceof ViewGroup) &&
                        (((ViewGroup) mFocusedView).getDescendantFocusability() ==
                                ViewGroup.FOCUS_AFTER_DESCENDANTS);
            if (descendantsHaveDibsOnFocus && isViewDescendantOf(v, mFocusedView)) {
                // If a view gets the focus, the listener will be invoked from requestChildFocus()
                v.requestFocus();
            }
        }
    }

    public void recomputeViewAttributes(View child) {
        checkThread();
        if (mView == child) {
            mAttachInfo.mRecomputeGlobalAttributes = true;
            if (!mWillDrawSoon) {
                scheduleTraversals();
            }
        }
    }

    void dispatchDetachedFromWindow() {
        if (Config.LOGV) Log.v("ViewRoot", "Detaching in " + this + " of " + mSurface);

        if (mView != null) {
            mView.dispatchDetachedFromWindow();
        }

        mView = null;
        mAttachInfo.mRootView = null;

        if (mUseGL) {
            destroyGL();
        }

        try {
            sWindowSession.remove(mWindow);
        } catch (RemoteException e) {
        }
    }
    
    /**
     * Return true if child is an ancestor of parent, (or equal to the parent).
     */
    private static boolean isViewDescendantOf(View child, View parent) {
        if (child == parent) {
            return true;
        }

        final ViewParent theParent = child.getParent();
        return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent);
    }


    public final static int DO_TRAVERSAL = 1000;
    public final static int DIE = 1001;
    public final static int RESIZED = 1002;
    public final static int RESIZED_REPORT = 1003;
    public final static int WINDOW_FOCUS_CHANGED = 1004;
    public final static int DISPATCH_KEY = 1005;
    public final static int DISPATCH_POINTER = 1006;
    public final static int DISPATCH_TRACKBALL = 1007;
    public final static int DISPATCH_APP_VISIBILITY = 1008;
    public final static int DISPATCH_GET_NEW_SURFACE = 1009;
    public final static int FINISHED_EVENT = 1010;
    public final static int DISPATCH_KEY_FROM_IME = 1011;
    public final static int FINISH_INPUT_CONNECTION = 1012;
    public final static int CHECK_FOCUS = 1013;

    @Override
    public void handleMessage(Message msg) {
        switch (msg.what) {
        case View.AttachInfo.INVALIDATE_MSG:
            ((View) msg.obj).invalidate();
            break;
        case View.AttachInfo.INVALIDATE_RECT_MSG:
            final View.AttachInfo.InvalidateInfo info = (View.AttachInfo.InvalidateInfo) msg.obj;
            info.target.invalidate(info.left, info.top, info.right, info.bottom);
            info.release();
            break;
        case DO_TRAVERSAL:
            if (mProfile) {
                Debug.startMethodTracing("ViewRoot");
            }

            performTraversals();

            if (mProfile) {
                Debug.stopMethodTracing();
                mProfile = false;
            }
            break;
        case FINISHED_EVENT:
            handleFinishedEvent(msg.arg1, msg.arg2 != 0);
            break;
        case DISPATCH_KEY:
            if (LOCAL_LOGV) Log.v(
                "ViewRoot", "Dispatching key "
                + msg.obj + " to " + mView);
            deliverKeyEvent((KeyEvent)msg.obj, true);
            break;
        case DISPATCH_POINTER: {
            MotionEvent event = (MotionEvent)msg.obj;

            boolean didFinish;
            if (event == null) {
                try {
                    event = sWindowSession.getPendingPointerMove(mWindow);
                } catch (RemoteException e) {
                }
                didFinish = true;
            } else {
                didFinish = event.getAction() == MotionEvent.ACTION_OUTSIDE;
            }
            if (event != null) {
                event.scale(mAppScaleInverted);
            }

            try {
                boolean handled;
                if (mView != null && mAdded && event != null) {

                    // enter touch mode on the down
                    boolean isDown = event.getAction() == MotionEvent.ACTION_DOWN;
                    if (isDown) {
                        ensureTouchMode(true);
                    }
                    if(Config.LOGV) {
                        captureMotionLog("captureDispatchPointer", event);
                    }
                    event.offsetLocation(0, mCurScrollY);
                    handled = mView.dispatchTouchEvent(event);
                    if (!handled && isDown) {
                        int edgeSlop = mViewConfiguration.getScaledEdgeSlop();

                        final int edgeFlags = event.getEdgeFlags();
                        int direction = View.FOCUS_UP;
                        int x = (int)event.getX();
                        int y = (int)event.getY();
                        final int[] deltas = new int[2];

                        if ((edgeFlags & MotionEvent.EDGE_TOP) != 0) {
                            direction = View.FOCUS_DOWN;
                            if ((edgeFlags & MotionEvent.EDGE_LEFT) != 0) {
                                deltas[0] = edgeSlop;
                                x += edgeSlop;
                            } else if ((edgeFlags & MotionEvent.EDGE_RIGHT) != 0) {
                                deltas[0] = -edgeSlop;
                                x -= edgeSlop;
                            }
                        } else if ((edgeFlags & MotionEvent.EDGE_BOTTOM) != 0) {
                            direction = View.FOCUS_UP;
                            if ((edgeFlags & MotionEvent.EDGE_LEFT) != 0) {
                                deltas[0] = edgeSlop;
                                x += edgeSlop;
                            } else if ((edgeFlags & MotionEvent.EDGE_RIGHT) != 0) {
                                deltas[0] = -edgeSlop;
                                x -= edgeSlop;
                            }
                        } else if ((edgeFlags & MotionEvent.EDGE_LEFT) != 0) {
                            direction = View.FOCUS_RIGHT;
                        } else if ((edgeFlags & MotionEvent.EDGE_RIGHT) != 0) {
                            direction = View.FOCUS_LEFT;
                        }

                        if (edgeFlags != 0 && mView instanceof ViewGroup) {
                            View nearest = FocusFinder.getInstance().findNearestTouchable(
                                    ((ViewGroup) mView), x, y, direction, deltas);
                            if (nearest != null) {
                                event.offsetLocation(deltas[0], deltas[1]);
                                event.setEdgeFlags(0);
                                mView.dispatchTouchEvent(event);
                            }
                        }
                    }
                }
            } finally {
                if (!didFinish) {
                    try {
                        sWindowSession.finishKey(mWindow);
                    } catch (RemoteException e) {
                    }
                }
                if (event != null) {
                    event.recycle();
                }
                if (LOCAL_LOGV || WATCH_POINTER) Log.i(TAG, "Done dispatching!");
                // Let the exception fall through -- the looper will catch
                // it and take care of the bad app for us.
            }
        } break;
        case DISPATCH_TRACKBALL:
            deliverTrackballEvent((MotionEvent)msg.obj);
            break;
        case DISPATCH_APP_VISIBILITY:
            handleAppVisibility(msg.arg1 != 0);
            break;
        case DISPATCH_GET_NEW_SURFACE:
            handleGetNewSurface();
            break;
        case RESIZED:
            Rect coveredInsets = ((Rect[])msg.obj)[0];
            Rect visibleInsets = ((Rect[])msg.obj)[1];
            if (mWinFrame.width() == msg.arg1 && mWinFrame.height() == msg.arg2
                    && mPendingContentInsets.equals(coveredInsets)
                    && mPendingVisibleInsets.equals(visibleInsets)) {
                break;
            }
            // fall through...
        case RESIZED_REPORT:
            if (mAdded) {
                mWinFrame.left = 0;
                mWinFrame.right = msg.arg1;
                mWinFrame.top = 0;
                mWinFrame.bottom = msg.arg2;
                mPendingContentInsets.set(((Rect[])msg.obj)[0]);
                mPendingVisibleInsets.set(((Rect[])msg.obj)[1]);
                if (msg.what == RESIZED_REPORT) {
                    mReportNextDraw = true;
                }
                requestLayout();
            }
            break;
        case WINDOW_FOCUS_CHANGED: {
            if (mAdded) {
                boolean hasWindowFocus = msg.arg1 != 0;
                mAttachInfo.mHasWindowFocus = hasWindowFocus;
                if (hasWindowFocus) {
                    boolean inTouchMode = msg.arg2 != 0;
                    ensureTouchModeLocally(inTouchMode);

                    if (mGlWanted) {
                        checkEglErrors();
                        // we lost the gl context, so recreate it.
                        if (mGlWanted && !mUseGL) {
                            initializeGL();
                            if (mGlCanvas != null) {
                                mGlCanvas.setViewport((int) (mWidth * mAppScale),
                                        (int) (mHeight * mAppScale));
                            }
                        }
                    }
                }
                
                mLastWasImTarget = WindowManager.LayoutParams
                        .mayUseInputMethod(mWindowAttributes.flags);
                
                InputMethodManager imm = InputMethodManager.peekInstance();
                if (mView != null) {
                    if (hasWindowFocus && imm != null && mLastWasImTarget) {
                        imm.startGettingWindowFocus(mView);
                    }
                    mView.dispatchWindowFocusChanged(hasWindowFocus);
                }
                
                // Note: must be done after the focus change callbacks,
                // so all of the view state is set up correctly.
                if (hasWindowFocus) {
                    if (imm != null && mLastWasImTarget) {
                        imm.onWindowFocus(mView, mView.findFocus(),
                                mWindowAttributes.softInputMode,
                                !mHasHadWindowFocus, mWindowAttributes.flags);
                    }
                    // Clear the forward bit.  We can just do this directly, since
                    // the window manager doesn't care about it.
                    mWindowAttributes.softInputMode &=
                            ~WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION;
                    ((WindowManager.LayoutParams)mView.getLayoutParams())
                            .softInputMode &=
                                ~WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION;
                    mHasHadWindowFocus = true;
                }
            }
        } break;
        case DIE:
            dispatchDetachedFromWindow();
            break;
        case DISPATCH_KEY_FROM_IME: {
            if (LOCAL_LOGV) Log.v(
                "ViewRoot", "Dispatching key "
                + msg.obj + " from IME to " + mView);
            KeyEvent event = (KeyEvent)msg.obj;
            if ((event.getFlags()&KeyEvent.FLAG_FROM_SYSTEM) != 0) {
                // The IME is trying to say this event is from the
                // system!  Bad bad bad!
                event = KeyEvent.changeFlags(event,
                        event.getFlags()&~KeyEvent.FLAG_FROM_SYSTEM);
            }
            deliverKeyEventToViewHierarchy((KeyEvent)msg.obj, false);
        } break;
        case FINISH_INPUT_CONNECTION: {
            InputMethodManager imm = InputMethodManager.peekInstance();
            if (imm != null) {
                imm.reportFinishInputConnection((InputConnection)msg.obj);
            }
        } break;
        case CHECK_FOCUS: {
            InputMethodManager imm = InputMethodManager.peekInstance();
            if (imm != null) {
                imm.checkFocus();
            }
        } break;
        }
    }

    /**
     * Something in the current window tells us we need to change the touch mode.  For
     * example, we are not in touch mode, and the user touches the screen.
     *
     * If the touch mode has changed, tell the window manager, and handle it locally.
     *
     * @param inTouchMode Whether we want to be in touch mode.
     * @return True if the touch mode changed and focus changed was changed as a result
     */
    boolean ensureTouchMode(boolean inTouchMode) {
        if (DBG) Log.d("touchmode", "ensureTouchMode(" + inTouchMode + "), current "
                + "touch mode is " + mAttachInfo.mInTouchMode);
        if (mAttachInfo.mInTouchMode == inTouchMode) return false;

        // tell the window manager
        try {
            sWindowSession.setInTouchMode(inTouchMode);
        } catch (RemoteException e) {
            throw new RuntimeException(e);
        }

        // handle the change
        return ensureTouchModeLocally(inTouchMode);
    }

    /**
     * Ensure that the touch mode for this window is set, and if it is changing,
     * take the appropriate action.
     * @param inTouchMode Whether we want to be in touch mode.
     * @return True if the touch mode changed and focus changed was changed as a result
     */
    private boolean ensureTouchModeLocally(boolean inTouchMode) {
        if (DBG) Log.d("touchmode", "ensureTouchModeLocally(" + inTouchMode + "), current "
                + "touch mode is " + mAttachInfo.mInTouchMode);

        if (mAttachInfo.mInTouchMode == inTouchMode) return false;

        mAttachInfo.mInTouchMode = inTouchMode;
        mAttachInfo.mTreeObserver.dispatchOnTouchModeChanged(inTouchMode);

        return (inTouchMode) ? enterTouchMode() : leaveTouchMode();
    }

    private boolean enterTouchMode() {
        if (mView != null) {
            if (mView.hasFocus()) {
                // note: not relying on mFocusedView here because this could
                // be when the window is first being added, and mFocused isn't
                // set yet.
                final View focused = mView.findFocus();
                if (focused != null && !focused.isFocusableInTouchMode()) {

                    final ViewGroup ancestorToTakeFocus =
                            findAncestorToTakeFocusInTouchMode(focused);
                    if (ancestorToTakeFocus != null) {
                        // there is an ancestor that wants focus after its descendants that
                        // is focusable in touch mode.. give it focus
                        return ancestorToTakeFocus.requestFocus();
                    } else {
                        // nothing appropriate to have focus in touch mode, clear it out
                        mView.unFocus();
                        mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(focused, null);
                        mFocusedView = null;
                        return true;
                    }
                }
            }
        }
        return false;
    }


    /**
     * Find an ancestor of focused that wants focus after its descendants and is
     * focusable in touch mode.
     * @param focused The currently focused view.
     * @return An appropriate view, or null if no such view exists.
     */
    private ViewGroup findAncestorToTakeFocusInTouchMode(View focused) {
        ViewParent parent = focused.getParent();
        while (parent instanceof ViewGroup) {
            final ViewGroup vgParent = (ViewGroup) parent;
            if (vgParent.getDescendantFocusability() == ViewGroup.FOCUS_AFTER_DESCENDANTS
                    && vgParent.isFocusableInTouchMode()) {
                return vgParent;
            }
            if (vgParent.isRootNamespace()) {
                return null;
            } else {
                parent = vgParent.getParent();
            }
        }
        return null;
    }

    private boolean leaveTouchMode() {
        if (mView != null) {
            if (mView.hasFocus()) {
                // i learned the hard way to not trust mFocusedView :)
                mFocusedView = mView.findFocus();
                if (!(mFocusedView instanceof ViewGroup)) {
                    // some view has focus, let it keep it
                    return false;
                } else if (((ViewGroup)mFocusedView).getDescendantFocusability() !=
                        ViewGroup.FOCUS_AFTER_DESCENDANTS) {
                    // some view group has focus, and doesn't prefer its children
                    // over itself for focus, so let them keep it.
                    return false;
                }
            }

            // find the best view to give focus to in this brave new non-touch-mode
            // world
            final View focused = focusSearch(null, View.FOCUS_DOWN);
            if (focused != null) {
                return focused.requestFocus(View.FOCUS_DOWN);
            }
        }
        return false;
    }


    private void deliverTrackballEvent(MotionEvent event) {
        boolean didFinish;
        if (event == null) {
            try {
                event = sWindowSession.getPendingTrackballMove(mWindow);
            } catch (RemoteException e) {
            }
            didFinish = true;
        } else {
            didFinish = false;
        }
        if (event != null) {
            event.scale(mAppScaleInverted);
        }

        if (DEBUG_TRACKBALL) Log.v(TAG, "Motion event:" + event);

        boolean handled = false;
        try {
            if (event == null) {
                handled = true;
            } else if (mView != null && mAdded) {
                handled = mView.dispatchTrackballEvent(event);
                if (!handled) {
                    // we could do something here, like changing the focus
                    // or something?
                }
            }
        } finally {
            if (handled) {
                if (!didFinish) {
                    try {
                        sWindowSession.finishKey(mWindow);
                    } catch (RemoteException e) {
                    }
                }
                if (event != null) {
                    event.recycle();
                }
                // If we reach this, we delivered a trackball event to mView and
                // mView consumed it. Because we will not translate the trackball
                // event into a key event, touch mode will not exit, so we exit
                // touch mode here.
                ensureTouchMode(false);
                //noinspection ReturnInsideFinallyBlock
                return;
            }
            // Let the exception fall through -- the looper will catch
            // it and take care of the bad app for us.
        }

        final TrackballAxis x = mTrackballAxisX;
        final TrackballAxis y = mTrackballAxisY;

        long curTime = SystemClock.uptimeMillis();
        if ((mLastTrackballTime+MAX_TRACKBALL_DELAY) < curTime) {
            // It has been too long since the last movement,
            // so restart at the beginning.
            x.reset(0);
            y.reset(0);
            mLastTrackballTime = curTime;
        }

        try {
            final int action = event.getAction();
            final int metastate = event.getMetaState();
            switch (action) {
                case MotionEvent.ACTION_DOWN:
                    x.reset(2);
                    y.reset(2);
                    deliverKeyEvent(new KeyEvent(curTime, curTime,
                            KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_CENTER,
                            0, metastate), false);
                    break;
                case MotionEvent.ACTION_UP:
                    x.reset(2);
                    y.reset(2);
                    deliverKeyEvent(new KeyEvent(curTime, curTime,
                            KeyEvent.ACTION_UP, KeyEvent.KEYCODE_DPAD_CENTER,
                            0, metastate), false);
                    break;
            }

            if (DEBUG_TRACKBALL) Log.v(TAG, "TB X=" + x.position + " step="
                    + x.step + " dir=" + x.dir + " acc=" + x.acceleration
                    + " move=" + event.getX()
                    + " / Y=" + y.position + " step="
                    + y.step + " dir=" + y.dir + " acc=" + y.acceleration
                    + " move=" + event.getY());
            final float xOff = x.collect(event.getX(), event.getEventTime(), "X");
            final float yOff = y.collect(event.getY(), event.getEventTime(), "Y");

            // Generate DPAD events based on the trackball movement.
            // We pick the axis that has moved the most as the direction of
            // the DPAD.  When we generate DPAD events for one axis, then the
            // other axis is reset -- we don't want to perform DPAD jumps due
            // to slight movements in the trackball when making major movements
            // along the other axis.
            int keycode = 0;
            int movement = 0;
            float accel = 1;
            if (xOff > yOff) {
                movement = x.generate((2/event.getXPrecision()));
                if (movement != 0) {
                    keycode = movement > 0 ? KeyEvent.KEYCODE_DPAD_RIGHT
                            : KeyEvent.KEYCODE_DPAD_LEFT;
                    accel = x.acceleration;
                    y.reset(2);
                }
            } else if (yOff > 0) {
                movement = y.generate((2/event.getYPrecision()));
                if (movement != 0) {
                    keycode = movement > 0 ? KeyEvent.KEYCODE_DPAD_DOWN
                            : KeyEvent.KEYCODE_DPAD_UP;
                    accel = y.acceleration;
                    x.reset(2);
                }
            }

            if (keycode != 0) {
                if (movement < 0) movement = -movement;
                int accelMovement = (int)(movement * accel);
                if (DEBUG_TRACKBALL) Log.v(TAG, "Move: movement=" + movement
                        + " accelMovement=" + accelMovement
                        + " accel=" + accel);
                if (accelMovement > movement) {
                    if (DEBUG_TRACKBALL) Log.v("foo", "Delivering fake DPAD: "
                            + keycode);
                    movement--;
                    deliverKeyEvent(new KeyEvent(curTime, curTime,
                            KeyEvent.ACTION_MULTIPLE, keycode,
                            accelMovement-movement, metastate), false);
                }
                while (movement > 0) {
                    if (DEBUG_TRACKBALL) Log.v("foo", "Delivering fake DPAD: "
                            + keycode);
                    movement--;
                    curTime = SystemClock.uptimeMillis();
                    deliverKeyEvent(new KeyEvent(curTime, curTime,
                            KeyEvent.ACTION_DOWN, keycode, 0, event.getMetaState()), false);
                    deliverKeyEvent(new KeyEvent(curTime, curTime,
                            KeyEvent.ACTION_UP, keycode, 0, metastate), false);
                }
                mLastTrackballTime = curTime;
            }
        } finally {
            if (!didFinish) {
                try {
                    sWindowSession.finishKey(mWindow);
                } catch (RemoteException e) {
                }
                if (event != null) {
                    event.recycle();
                }
            }
            // Let the exception fall through -- the looper will catch
            // it and take care of the bad app for us.
        }
    }

    /**
     * @param keyCode The key code
     * @return True if the key is directional.
     */
    static boolean isDirectional(int keyCode) {
        switch (keyCode) {
        case KeyEvent.KEYCODE_DPAD_LEFT:
        case KeyEvent.KEYCODE_DPAD_RIGHT:
        case KeyEvent.KEYCODE_DPAD_UP:
        case KeyEvent.KEYCODE_DPAD_DOWN:
            return true;
        }
        return false;
    }

    /**
     * Returns true if this key is a keyboard key.
     * @param keyEvent The key event.
     * @return whether this key is a keyboard key.
     */
    private static boolean isKeyboardKey(KeyEvent keyEvent) {
      final int convertedKey = keyEvent.getUnicodeChar();
        return convertedKey > 0;
    }



    /**
     * See if the key event means we should leave touch mode (and leave touch
     * mode if so).
     * @param event The key event.
     * @return Whether this key event should be consumed (meaning the act of
     *   leaving touch mode alone is considered the event).
     */
    private boolean checkForLeavingTouchModeAndConsume(KeyEvent event) {
        if (event.getAction() != KeyEvent.ACTION_DOWN) {
            return false;
        }
        if ((event.getFlags()&KeyEvent.FLAG_KEEP_TOUCH_MODE) != 0) {
            return false;
        }

        // only relevant if we are in touch mode
        if (!mAttachInfo.mInTouchMode) {
            return false;
        }

        // if something like an edit text has focus and the user is typing,
        // leave touch mode
        //
        // note: the condition of not being a keyboard key is kind of a hacky
        // approximation of whether we think the focused view will want the
        // key; if we knew for sure whether the focused view would consume
        // the event, that would be better.
        if (isKeyboardKey(event) && mView != null && mView.hasFocus()) {
            mFocusedView = mView.findFocus();
            if ((mFocusedView instanceof ViewGroup)
                    && ((ViewGroup) mFocusedView).getDescendantFocusability() ==
                    ViewGroup.FOCUS_AFTER_DESCENDANTS) {
                // something has focus, but is holding it weakly as a container
                return false;
            }
            if (ensureTouchMode(false)) {
                throw new IllegalStateException("should not have changed focus "
                        + "when leaving touch mode while a view has focus.");
            }
            return false;
        }

        if (isDirectional(event.getKeyCode())) {
            // no view has focus, so we leave touch mode (and find something
            // to give focus to).  the event is consumed if we were able to
            // find something to give focus to.
            return ensureTouchMode(false);
        }
        return false;
    }

    /**
     * log motion events 
     */
    private static void captureMotionLog(String subTag, MotionEvent ev) {
        //check dynamic switch        
        if (ev == null ||
                SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_EVENT, 0) == 0) {
            return;
        } 
        
        StringBuilder sb = new StringBuilder(subTag + ": ");        
        sb.append(ev.getDownTime()).append(',');        
        sb.append(ev.getEventTime()).append(',');        
        sb.append(ev.getAction()).append(',');        
        sb.append(ev.getX()).append(',');        
        sb.append(ev.getY()).append(',');        
        sb.append(ev.getPressure()).append(',');        
        sb.append(ev.getSize()).append(',');        
        sb.append(ev.getMetaState()).append(',');        
        sb.append(ev.getXPrecision()).append(',');        
        sb.append(ev.getYPrecision()).append(',');        
        sb.append(ev.getDeviceId()).append(',');        
        sb.append(ev.getEdgeFlags());
        Log.d(TAG, sb.toString());        
    }
    /**
     * log motion events 
     */
    private static void captureKeyLog(String subTag, KeyEvent ev) {
        //check dynamic switch                
        if (ev == null || 
                SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_EVENT, 0) == 0) {
            return;
        }
        StringBuilder sb = new StringBuilder(subTag + ": ");        
        sb.append(ev.getDownTime()).append(',');
        sb.append(ev.getEventTime()).append(',');
        sb.append(ev.getAction()).append(',');
        sb.append(ev.getKeyCode()).append(',');        
        sb.append(ev.getRepeatCount()).append(',');
        sb.append(ev.getMetaState()).append(',');
        sb.append(ev.getDeviceId()).append(',');
        sb.append(ev.getScanCode());
        Log.d(TAG, sb.toString());        
    }    

    int enqueuePendingEvent(Object event, boolean sendDone) {
        int seq = mPendingEventSeq+1;
        if (seq < 0) seq = 0;
        mPendingEventSeq = seq;
        mPendingEvents.put(seq, event);
        return sendDone ? seq : -seq;
    }

    Object retrievePendingEvent(int seq) {
        if (seq < 0) seq = -seq;
        Object event = mPendingEvents.get(seq);
        if (event != null) {
            mPendingEvents.remove(seq);
        }
        return event;
    }
    
    private void deliverKeyEvent(KeyEvent event, boolean sendDone) {
        // If mView is null, we just consume the key event because it doesn't
        // make sense to do anything else with it.
        boolean handled = mView != null
                ? mView.dispatchKeyEventPreIme(event) : true;
        if (handled) {
            if (sendDone) {
                if (LOCAL_LOGV) Log.v(
                    "ViewRoot", "Telling window manager key is finished");
                try {
                    sWindowSession.finishKey(mWindow);
                } catch (RemoteException e) {
                }
            }
            return;
        }
        // If it is possible for this window to interact with the input
        // method window, then we want to first dispatch our key events
        // to the input method.
        if (mLastWasImTarget) {
            InputMethodManager imm = InputMethodManager.peekInstance();
            if (imm != null && mView != null) {
                int seq = enqueuePendingEvent(event, sendDone);
                if (DEBUG_IMF) Log.v(TAG, "Sending key event to IME: seq="
                        + seq + " event=" + event);
                imm.dispatchKeyEvent(mView.getContext(), seq, event,
                        mInputMethodCallback);
                return;
            }
        }
        deliverKeyEventToViewHierarchy(event, sendDone);
    }

    void handleFinishedEvent(int seq, boolean handled) {
        final KeyEvent event = (KeyEvent)retrievePendingEvent(seq);
        if (DEBUG_IMF) Log.v(TAG, "IME finished event: seq=" + seq
                + " handled=" + handled + " event=" + event);
        if (event != null) {
            final boolean sendDone = seq >= 0;
            if (!handled) {
                deliverKeyEventToViewHierarchy(event, sendDone);
                return;
            } else if (sendDone) {
                if (LOCAL_LOGV) Log.v(
                        "ViewRoot", "Telling window manager key is finished");
                try {
                    sWindowSession.finishKey(mWindow);
                } catch (RemoteException e) {
                }
            } else {
                Log.w("ViewRoot", "handleFinishedEvent(seq=" + seq
                        + " handled=" + handled + " ev=" + event
                        + ") neither delivering nor finishing key");
            }
        }
    }
    
    private void deliverKeyEventToViewHierarchy(KeyEvent event, boolean sendDone) {
        try {
            if (mView != null && mAdded) {
                final int action = event.getAction();
                boolean isDown = (action == KeyEvent.ACTION_DOWN);

                if (checkForLeavingTouchModeAndConsume(event)) {
                    return;
                }                
                
                if (Config.LOGV) {
                    captureKeyLog("captureDispatchKeyEvent", event);
                }
                boolean keyHandled = mView.dispatchKeyEvent(event);

                if (!keyHandled && isDown) {
                    int direction = 0;
                    switch (event.getKeyCode()) {
                    case KeyEvent.KEYCODE_DPAD_LEFT:
                        direction = View.FOCUS_LEFT;
                        break;
                    case KeyEvent.KEYCODE_DPAD_RIGHT:
                        direction = View.FOCUS_RIGHT;
                        break;
                    case KeyEvent.KEYCODE_DPAD_UP:
                        direction = View.FOCUS_UP;
                        break;
                    case KeyEvent.KEYCODE_DPAD_DOWN:
                        direction = View.FOCUS_DOWN;
                        break;
                    }

                    if (direction != 0) {

                        View focused = mView != null ? mView.findFocus() : null;
                        if (focused != null) {
                            View v = focused.focusSearch(direction);
                            boolean focusPassed = false;
                            if (v != null && v != focused) {
                                // do the math the get the interesting rect
                                // of previous focused into the coord system of
                                // newly focused view
                                focused.getFocusedRect(mTempRect);
                                ((ViewGroup) mView).offsetDescendantRectToMyCoords(focused, mTempRect);
                                ((ViewGroup) mView).offsetRectIntoDescendantCoords(v, mTempRect);
                                focusPassed = v.requestFocus(direction, mTempRect);
                            }

                            if (!focusPassed) {
                                mView.dispatchUnhandledMove(focused, direction);
                            } else {
                                playSoundEffect(SoundEffectConstants.getContantForFocusDirection(direction));
                            }
                        }
                    }
                }
            }

        } finally {
            if (sendDone) {
                if (LOCAL_LOGV) Log.v(
                    "ViewRoot", "Telling window manager key is finished");
                try {
                    sWindowSession.finishKey(mWindow);
                } catch (RemoteException e) {
                }
            }
            // Let the exception fall through -- the looper will catch
            // it and take care of the bad app for us.
        }
    }

    private AudioManager getAudioManager() {
        if (mView == null) {
            throw new IllegalStateException("getAudioManager called when there is no mView");
        }
        if (mAudioManager == null) {
            mAudioManager = (AudioManager) mView.getContext().getSystemService(Context.AUDIO_SERVICE);
        }
        return mAudioManager;
    }

    private int relayoutWindow(WindowManager.LayoutParams params, int viewVisibility,
            boolean insetsPending) throws RemoteException {
        int relayoutResult = sWindowSession.relayout(
                mWindow, params,
                (int) (mView.mMeasuredWidth * mAppScale),
                (int) (mView.mMeasuredHeight * mAppScale),
                viewVisibility, insetsPending, mWinFrame,
                mPendingContentInsets, mPendingVisibleInsets, mSurface);
        mPendingContentInsets.scale(mAppScaleInverted);
        mPendingVisibleInsets.scale(mAppScaleInverted);
        mWinFrame.scale(mAppScaleInverted);
        return relayoutResult;
    }

    /**
     * {@inheritDoc}
     */
    public void playSoundEffect(int effectId) {
        checkThread();

        final AudioManager audioManager = getAudioManager();

        switch (effectId) {
            case SoundEffectConstants.CLICK:
                audioManager.playSoundEffect(AudioManager.FX_KEY_CLICK);
                return;
            case SoundEffectConstants.NAVIGATION_DOWN:
                audioManager.playSoundEffect(AudioManager.FX_FOCUS_NAVIGATION_DOWN);
                return;
            case SoundEffectConstants.NAVIGATION_LEFT:
                audioManager.playSoundEffect(AudioManager.FX_FOCUS_NAVIGATION_LEFT);
                return;
            case SoundEffectConstants.NAVIGATION_RIGHT:
                audioManager.playSoundEffect(AudioManager.FX_FOCUS_NAVIGATION_RIGHT);
                return;
            case SoundEffectConstants.NAVIGATION_UP:
                audioManager.playSoundEffect(AudioManager.FX_FOCUS_NAVIGATION_UP);
                return;
            default:
                throw new IllegalArgumentException("unknown effect id " + effectId +
                        " not defined in " + SoundEffectConstants.class.getCanonicalName());
        }
    }

    /**
     * {@inheritDoc}
     */
    public boolean performHapticFeedback(int effectId, boolean always) {
        try {
            return sWindowSession.performHapticFeedback(mWindow, effectId, always);
        } catch (RemoteException e) {
            return false;
        }
    }

    /**
     * {@inheritDoc}
     */
    public View focusSearch(View focused, int direction) {
        checkThread();
        if (!(mView instanceof ViewGroup)) {
            return null;
        }
        return FocusFinder.getInstance().findNextFocus((ViewGroup) mView, focused, direction);
    }

    public void debug() {
        mView.debug();
    }

    public void die(boolean immediate) {
        checkThread();
        if (Config.LOGV) Log.v("ViewRoot", "DIE in " + this + " of " + mSurface);
        synchronized (this) {
            if (mAdded && !mFirst) {
                int viewVisibility = mView.getVisibility();
                boolean viewVisibilityChanged = mViewVisibility != viewVisibility;
                if (mWindowAttributesChanged || viewVisibilityChanged) {
                    // If layout params have been changed, first give them
                    // to the window manager to make sure it has the correct
                    // animation info.
                    try {
                        if ((relayoutWindow(mWindowAttributes, viewVisibility, false)
                                & WindowManagerImpl.RELAYOUT_FIRST_TIME) != 0) {
                            sWindowSession.finishDrawing(mWindow);
                        }
                    } catch (RemoteException e) {
                    }
                }

                mSurface = null;
            }
            if (mAdded) {
                mAdded = false;
                if (immediate) {
                    dispatchDetachedFromWindow();
                } else if (mView != null) {
                    sendEmptyMessage(DIE);
                }
            }
        }
    }

    public void dispatchFinishedEvent(int seq, boolean handled) {
        Message msg = obtainMessage(FINISHED_EVENT);
        msg.arg1 = seq;
        msg.arg2 = handled ? 1 : 0;
        sendMessage(msg);
    }
    
    public void dispatchResized(int w, int h, Rect coveredInsets,
            Rect visibleInsets, boolean reportDraw) {
        if (DEBUG_LAYOUT) Log.v(TAG, "Resizing " + this + ": w=" + w
                + " h=" + h + " coveredInsets=" + coveredInsets.toShortString()
                + " visibleInsets=" + visibleInsets.toShortString()
                + " reportDraw=" + reportDraw);
        Message msg = obtainMessage(reportDraw ? RESIZED_REPORT :RESIZED);

        coveredInsets.scale(mAppScaleInverted);
        visibleInsets.scale(mAppScaleInverted);
        msg.arg1 = (int) (w * mAppScaleInverted);
        msg.arg2 = (int) (h * mAppScaleInverted);
        msg.obj = new Rect[] { new Rect(coveredInsets), new Rect(visibleInsets) };
        sendMessage(msg);
    }

    public void dispatchKey(KeyEvent event) {
        if (event.getAction() == KeyEvent.ACTION_DOWN) {
            //noinspection ConstantConditions
            if (false && event.getKeyCode() == KeyEvent.KEYCODE_CAMERA) {
                if (Config.LOGD) Log.d("keydisp",
                        "===================================================");
                if (Config.LOGD) Log.d("keydisp", "Focused view Hierarchy is:");
                debug();

                if (Config.LOGD) Log.d("keydisp",
                        "===================================================");
            }
        }

        Message msg = obtainMessage(DISPATCH_KEY);
        msg.obj = event;

        if (LOCAL_LOGV) Log.v(
            "ViewRoot", "sending key " + event + " to " + mView);

        sendMessageAtTime(msg, event.getEventTime());
    }

    public void dispatchPointer(MotionEvent event, long eventTime) {
        Message msg = obtainMessage(DISPATCH_POINTER);
        msg.obj = event;
        sendMessageAtTime(msg, eventTime);
    }

    public void dispatchTrackball(MotionEvent event, long eventTime) {
        Message msg = obtainMessage(DISPATCH_TRACKBALL);
        msg.obj = event;
        sendMessageAtTime(msg, eventTime);
    }

    public void dispatchAppVisibility(boolean visible) {
        Message msg = obtainMessage(DISPATCH_APP_VISIBILITY);
        msg.arg1 = visible ? 1 : 0;
        sendMessage(msg);
    }

    public void dispatchGetNewSurface() {
        Message msg = obtainMessage(DISPATCH_GET_NEW_SURFACE);
        sendMessage(msg);
    }

    public void windowFocusChanged(boolean hasFocus, boolean inTouchMode) {
        Message msg = Message.obtain();
        msg.what = WINDOW_FOCUS_CHANGED;
        msg.arg1 = hasFocus ? 1 : 0;
        msg.arg2 = inTouchMode ? 1 : 0;
        sendMessage(msg);
    }

    public boolean showContextMenuForChild(View originalView) {
        return false;
    }

    public void createContextMenu(ContextMenu menu) {
    }

    public void childDrawableStateChanged(View child) {
    }

    protected Rect getWindowFrame() {
        return mWinFrame;
    }

    void checkThread() {
        if (mThread != Thread.currentThread()) {
            throw new CalledFromWrongThreadException(
                    "Only the original thread that created a view hierarchy can touch its views.");
        }
    }

    public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
        // ViewRoot never intercepts touch event, so this can be a no-op
    }

    public boolean requestChildRectangleOnScreen(View child, Rect rectangle,
            boolean immediate) {
        return scrollToRectOrFocus(rectangle, immediate);
    }
    
    static class InputMethodCallback extends IInputMethodCallback.Stub {
        private WeakReference<ViewRoot> mViewRoot;

        public InputMethodCallback(ViewRoot viewRoot) {
            mViewRoot = new WeakReference<ViewRoot>(viewRoot);
        }
        
        public void finishedEvent(int seq, boolean handled) {
            final ViewRoot viewRoot = mViewRoot.get();
            if (viewRoot != null) {
                viewRoot.dispatchFinishedEvent(seq, handled);
            }
        }

        public void sessionCreated(IInputMethodSession session) throws RemoteException {
            // Stub -- not for use in the client.
        }
    }
    
    static class EventCompletion extends Handler {
        final IWindow mWindow;
        final KeyEvent mKeyEvent;
        final boolean mIsPointer;
        final MotionEvent mMotionEvent;
        
        EventCompletion(Looper looper, IWindow window, KeyEvent key,
                boolean isPointer, MotionEvent motion) {
            super(looper);
            mWindow = window;
            mKeyEvent = key;
            mIsPointer = isPointer;
            mMotionEvent = motion;
            sendEmptyMessage(0);
        }
        
        @Override
        public void handleMessage(Message msg) {
            if (mKeyEvent != null) {
                try {
                    sWindowSession.finishKey(mWindow);
                 } catch (RemoteException e) {
                 }
           } else if (mIsPointer) {
                boolean didFinish;
                MotionEvent event = mMotionEvent;
                if (event == null) {
                    try {
                        event = sWindowSession.getPendingPointerMove(mWindow);
                    } catch (RemoteException e) {
                    }
                    didFinish = true;
                } else {
                    didFinish = event.getAction() == MotionEvent.ACTION_OUTSIDE;
                }
                if (!didFinish) {
                    try {
                        sWindowSession.finishKey(mWindow);
                     } catch (RemoteException e) {
                     }
                }
            } else {
                MotionEvent event = mMotionEvent;
                if (event == null) {
                    try {
                        event = sWindowSession.getPendingTrackballMove(mWindow);
                    } catch (RemoteException e) {
                    }
                } else {
                    try {
                        sWindowSession.finishKey(mWindow);
                     } catch (RemoteException e) {
                     }
                }
            }
        }
    }
    
    static class W extends IWindow.Stub {
        private final WeakReference<ViewRoot> mViewRoot;
        private final Looper mMainLooper;

        public W(ViewRoot viewRoot, Context context) {
            mViewRoot = new WeakReference<ViewRoot>(viewRoot);
            mMainLooper = context.getMainLooper();
        }

        public void resized(int w, int h, Rect coveredInsets,
                Rect visibleInsets, boolean reportDraw) {
            final ViewRoot viewRoot = mViewRoot.get();
            if (viewRoot != null) {
                viewRoot.dispatchResized(w, h, coveredInsets,
                        visibleInsets, reportDraw);
            }
        }

        public void dispatchKey(KeyEvent event) {
            final ViewRoot viewRoot = mViewRoot.get();
            if (viewRoot != null) {
                viewRoot.dispatchKey(event);
            } else {
                Log.w("ViewRoot.W", "Key event " + event + " but no ViewRoot available!");
                new EventCompletion(mMainLooper, this, event, false, null);
            }
        }

        public void dispatchPointer(MotionEvent event, long eventTime) {
            final ViewRoot viewRoot = mViewRoot.get();
            if (viewRoot != null) {
                viewRoot.dispatchPointer(event, eventTime);
            } else {
                new EventCompletion(mMainLooper, this, null, true, event);
            }
        }

        public void dispatchTrackball(MotionEvent event, long eventTime) {
            final ViewRoot viewRoot = mViewRoot.get();
            if (viewRoot != null) {
                viewRoot.dispatchTrackball(event, eventTime);
            } else {
                new EventCompletion(mMainLooper, this, null, false, event);
            }
        }

        public void dispatchAppVisibility(boolean visible) {
            final ViewRoot viewRoot = mViewRoot.get();
            if (viewRoot != null) {
                viewRoot.dispatchAppVisibility(visible);
            }
        }

        public void dispatchGetNewSurface() {
            final ViewRoot viewRoot = mViewRoot.get();
            if (viewRoot != null) {
                viewRoot.dispatchGetNewSurface();
            }
        }

        public void windowFocusChanged(boolean hasFocus, boolean inTouchMode) {
            final ViewRoot viewRoot = mViewRoot.get();
            if (viewRoot != null) {
                viewRoot.windowFocusChanged(hasFocus, inTouchMode);
            }
        }

        private static int checkCallingPermission(String permission) {
            if (!Process.supportsProcesses()) {
                return PackageManager.PERMISSION_GRANTED;
            }

            try {
                return ActivityManagerNative.getDefault().checkPermission(
                        permission, Binder.getCallingPid(), Binder.getCallingUid());
            } catch (RemoteException e) {
                return PackageManager.PERMISSION_DENIED;
            }
        }

        public void executeCommand(String command, String parameters, ParcelFileDescriptor out) {
            final ViewRoot viewRoot = mViewRoot.get();
            if (viewRoot != null) {
                final View view = viewRoot.mView;
                if (view != null) {
                    if (checkCallingPermission(Manifest.permission.DUMP) !=
                            PackageManager.PERMISSION_GRANTED) {
                        throw new SecurityException("Insufficient permissions to invoke"
                                + " executeCommand() from pid=" + Binder.getCallingPid()
                                + ", uid=" + Binder.getCallingUid());
                    }

                    OutputStream clientStream = null;
                    try {
                        clientStream = new ParcelFileDescriptor.AutoCloseOutputStream(out);
                        ViewDebug.dispatchCommand(view, command, parameters, clientStream);
                    } catch (IOException e) {
                        e.printStackTrace();
                    } finally {
                        if (clientStream != null) {
                            try {
                                clientStream.close();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                }
            }
        }
    }

    /**
     * Maintains state information for a single trackball axis, generating
     * discrete (DPAD) movements based on raw trackball motion.
     */
    static final class TrackballAxis {
        /**
         * The maximum amount of acceleration we will apply.
         */
        static final float MAX_ACCELERATION = 20;
        
        /**
         * The maximum amount of time (in milliseconds) between events in order
         * for us to consider the user to be doing fast trackball movements,
         * and thus apply an acceleration.
         */
        static final long FAST_MOVE_TIME = 150;
        
        /**
         * Scaling factor to the time (in milliseconds) between events to how
         * much to multiple/divide the current acceleration.  When movement
         * is < FAST_MOVE_TIME this multiplies the acceleration; when >
         * FAST_MOVE_TIME it divides it.
         */
        static final float ACCEL_MOVE_SCALING_FACTOR = (1.0f/40);
        
        float position;
        float absPosition;
        float acceleration = 1;
        long lastMoveTime = 0;
        int step;
        int dir;
        int nonAccelMovement;

        void reset(int _step) {
            position = 0;
            acceleration = 1;
            lastMoveTime = 0;
            step = _step;
            dir = 0;
        }

        /**
         * Add trackball movement into the state.  If the direction of movement
         * has been reversed, the state is reset before adding the
         * movement (so that you don't have to compensate for any previously
         * collected movement before see the result of the movement in the
         * new direction).
         *
         * @return Returns the absolute value of the amount of movement
         * collected so far.
         */
        float collect(float off, long time, String axis) {
            long normTime;
            if (off > 0) {
                normTime = (long)(off * FAST_MOVE_TIME);
                if (dir < 0) {
                    if (DEBUG_TRACKBALL) Log.v(TAG, axis + " reversed to positive!");
                    position = 0;
                    step = 0;
                    acceleration = 1;
                    lastMoveTime = 0;
                }
                dir = 1;
            } else if (off < 0) {
                normTime = (long)((-off) * FAST_MOVE_TIME);
                if (dir > 0) {
                    if (DEBUG_TRACKBALL) Log.v(TAG, axis + " reversed to negative!");
                    position = 0;
                    step = 0;
                    acceleration = 1;
                    lastMoveTime = 0;
                }
                dir = -1;
            } else {
                normTime = 0;
            }
            
            // The number of milliseconds between each movement that is
            // considered "normal" and will not result in any acceleration
            // or deceleration, scaled by the offset we have here.
            if (normTime > 0) {
                long delta = time - lastMoveTime;
                lastMoveTime = time;
                float acc = acceleration;
                if (delta < normTime) {
                    // The user is scrolling rapidly, so increase acceleration.
                    float scale = (normTime-delta) * ACCEL_MOVE_SCALING_FACTOR;
                    if (scale > 1) acc *= scale;
                    if (DEBUG_TRACKBALL) Log.v(TAG, axis + " accelerate: off="
                            + off + " normTime=" + normTime + " delta=" + delta
                            + " scale=" + scale + " acc=" + acc);
                    acceleration = acc < MAX_ACCELERATION ? acc : MAX_ACCELERATION;
                } else {
                    // The user is scrolling slowly, so decrease acceleration.
                    float scale = (delta-normTime) * ACCEL_MOVE_SCALING_FACTOR;
                    if (scale > 1) acc /= scale;
                    if (DEBUG_TRACKBALL) Log.v(TAG, axis + " deccelerate: off="
                            + off + " normTime=" + normTime + " delta=" + delta
                            + " scale=" + scale + " acc=" + acc);
                    acceleration = acc > 1 ? acc : 1;
                }
            }
            position += off;
            return (absPosition = Math.abs(position));
        }

        /**
         * Generate the number of discrete movement events appropriate for
         * the currently collected trackball movement.
         *
         * @param precision The minimum movement required to generate the
         * first discrete movement.
         *
         * @return Returns the number of discrete movements, either positive
         * or negative, or 0 if there is not enough trackball movement yet
         * for a discrete movement.
         */
        int generate(float precision) {
            int movement = 0;
            nonAccelMovement = 0;
            do {
                final int dir = position >= 0 ? 1 : -1;
                switch (step) {
                    // If we are going to execute the first step, then we want
                    // to do this as soon as possible instead of waiting for
                    // a full movement, in order to make things look responsive.
                    case 0:
                        if (absPosition < precision) {
                            return movement;
                        }
                        movement += dir;
                        nonAccelMovement += dir;
                        step = 1;
                        break;
                    // If we have generated the first movement, then we need
                    // to wait for the second complete trackball motion before
                    // generating the second discrete movement.
                    case 1:
                        if (absPosition < 2) {
                            return movement;
                        }
                        movement += dir;
                        nonAccelMovement += dir;
                        position += dir > 0 ? -2 : 2;
                        absPosition = Math.abs(position);
                        step = 2;
                        break;
                    // After the first two, we generate discrete movements
                    // consistently with the trackball, applying an acceleration
                    // if the trackball is moving quickly.  This is a simple
                    // acceleration on top of what we already compute based
                    // on how quickly the wheel is being turned, to apply
                    // a longer increasing acceleration to continuous movement
                    // in one direction.
                    default:
                        if (absPosition < 1) {
                            return movement;
                        }
                        movement += dir;
                        position += dir >= 0 ? -1 : 1;
                        absPosition = Math.abs(position);
                        float acc = acceleration;
                        acc *= 1.1f;
                        acceleration = acc < MAX_ACCELERATION ? acc : acceleration;
                        break;
                }
            } while (true);
        }
    }

    public static final class CalledFromWrongThreadException extends AndroidRuntimeException {
        public CalledFromWrongThreadException(String msg) {
            super(msg);
        }
    }

    private SurfaceHolder mHolder = new SurfaceHolder() {
        // we only need a SurfaceHolder for opengl. it would be nice
        // to implement everything else though, especially the callback
        // support (opengl doesn't make use of it right now, but eventually
        // will).
        public Surface getSurface() {
            return mSurface;
        }

        public boolean isCreating() {
            return false;
        }

        public void addCallback(Callback callback) {
        }

        public void removeCallback(Callback callback) {
        }

        public void setFixedSize(int width, int height) {
        }

        public void setSizeFromLayout() {
        }

        public void setFormat(int format) {
        }

        public void setType(int type) {
        }

        public void setKeepScreenOn(boolean screenOn) {
        }

        public Canvas lockCanvas() {
            return null;
        }

        public Canvas lockCanvas(Rect dirty) {
            return null;
        }

        public void unlockCanvasAndPost(Canvas canvas) {
        }
        public Rect getSurfaceFrame() {
            return null;
        }
    };

    static RunQueue getRunQueue() {
        RunQueue rq = sRunQueues.get();
        if (rq != null) {
            return rq;
        }
        rq = new RunQueue();
        sRunQueues.set(rq);
        return rq;
    }
    
    /**
     * @hide
     */
    static final class RunQueue {
        private final ArrayList<HandlerAction> mActions = new ArrayList<HandlerAction>();

        void post(Runnable action) {
            postDelayed(action, 0);
        }

        void postDelayed(Runnable action, long delayMillis) {
            HandlerAction handlerAction = new HandlerAction();
            handlerAction.action = action;
            handlerAction.delay = delayMillis;

            synchronized (mActions) {
                mActions.add(handlerAction);
            }
        }

        void removeCallbacks(Runnable action) {
            final HandlerAction handlerAction = new HandlerAction();
            handlerAction.action = action;

            synchronized (mActions) {
                final ArrayList<HandlerAction> actions = mActions;

                while (actions.remove(handlerAction)) {
                    // Keep going
                }
            }
        }

        void executeActions(Handler handler) {
            synchronized (mActions) {
                final ArrayList<HandlerAction> actions = mActions;
                final int count = actions.size();

                for (int i = 0; i < count; i++) {
                    final HandlerAction handlerAction = actions.get(i);
                    handler.postDelayed(handlerAction.action, handlerAction.delay);
                }

                mActions.clear();
            }
        }

        private static class HandlerAction {
            Runnable action;
            long delay;

            @Override
            public boolean equals(Object o) {
                if (this == o) return true;
                if (o == null || getClass() != o.getClass()) return false;

                HandlerAction that = (HandlerAction) o;

                return !(action != null ? !action.equals(that.action) : that.action != null);

            }

            @Override
            public int hashCode() {
                int result = action != null ? action.hashCode() : 0;
                result = 31 * result + (int) (delay ^ (delay >>> 32));
                return result;
            }
        }
    }

    private static native void nativeShowFPS(Canvas canvas, int durationMillis);

    // inform skia to just abandon its texture cache IDs
    // doesn't call glDeleteTextures
    private static native void nativeAbandonGlCaches();
}