packages/SystemUI/src/com/android/systemui/statusbar/tablet/RecentAppsPanel.java - platform/frameworks/base - Gitiles

 /*
  * Copyright (C) 2010 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 com.android.systemui.statusbar.tablet;

 import java.util.ArrayList;
 import java.util.List;

 import android.animation.Animator;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.app.ActivityManager;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ActivityInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.Matrix;
 import android.graphics.Paint;
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.graphics.Shader.TileMode;
 import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 import android.util.AttributeSet;
 import android.util.DisplayMetrics;
 import android.util.Log;
 import android.util.Slog;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.BaseAdapter;
 import android.widget.CheckBox;
 import android.widget.ImageView;
 import android.widget.ListView;
 import android.widget.RelativeLayout;
 import android.widget.TextView;

 import com.android.systemui.R;

 public class RecentAppsPanel extends RelativeLayout implements StatusBarPanel, OnItemClickListener {
     private static final int GLOW_PADDING = 15;
     private static final String TAG = "RecentAppsPanel";
     private static final boolean DEBUG = TabletStatusBar.DEBUG;
     private static final int DISPLAY_TASKS = 20;
     private static final int MAX_TASKS = DISPLAY_TASKS + 1; // allow extra for non-apps
     private TabletStatusBar mBar;
     private ArrayList<ActivityDescription> mActivityDescriptions;
     private int mIconDpi;
     private View mRecentsScrim;
     private View mRecentsGlowView;
     private ListView mRecentsContainer;
     private CheckBox mCompatMode;
     private Bitmap mGlowBitmap;
     private boolean mShowing;
     private Choreographer mChoreo;
     private View mRecentsDismissButton;
     private ActvityDescriptionAdapter mListAdapter;
     protected int mLastVisibleItem;

     static class ActivityDescription {
         int id;
         Bitmap thumbnail; // generated by Activity.onCreateThumbnail()
         Drawable icon; // application package icon
         String label; // application package label
         CharSequence description; // generated by Activity.onCreateDescription()
         Intent intent; // launch intent for application
         Matrix matrix; // arbitrary rotation matrix to correct orientation
         String packageName; // used to override animations (see onClick())
         int position; // position in list

         public ActivityDescription(Bitmap _thumbnail,
                 Drawable _icon, String _label, CharSequence _desc, Intent _intent,
                 int _id, int _pos, String _packageName)
         {
             thumbnail = _thumbnail;
             icon = _icon;
             label = _label;
             description = _desc;
             intent = _intent;
             id = _id;
             position = _pos;
             packageName = _packageName;
         }
     };

     /* package */ final static class ViewHolder {
         private ImageView thumbnailView;
         private ImageView iconView;
         private TextView labelView;
         private TextView descriptionView;
         private ActivityDescription activityDescription;
     }

     /* package */ final class ActvityDescriptionAdapter extends BaseAdapter {
         private LayoutInflater mInflater;

         public ActvityDescriptionAdapter(Context context) {
             mInflater = LayoutInflater.from(context);
         }

         public int getCount() {
             return mActivityDescriptions != null ? mActivityDescriptions.size() : 0;
         }

         public Object getItem(int position) {
             return position; // we only need the index
         }

         public long getItemId(int position) {
             return position; // we just need something unique for this position
         }

         public View getView(int position, View convertView, ViewGroup parent) {
             ViewHolder holder;
             if (convertView == null) {
                 convertView = mInflater.inflate(R.layout.status_bar_recent_item, null);
                 holder = new ViewHolder();
                 holder.thumbnailView = (ImageView) convertView.findViewById(R.id.app_thumbnail);
                 holder.iconView = (ImageView) convertView.findViewById(R.id.app_icon);
                 holder.labelView = (TextView) convertView.findViewById(R.id.app_label);
                 holder.descriptionView = (TextView) convertView.findViewById(R.id.app_description);
                 convertView.setTag(holder);
             } else {
                 holder = (ViewHolder) convertView.getTag();
             }

             // activityId is reverse since most recent appears at the bottom...
             final int activityId = mActivityDescriptions.size() - position - 1;

             final ActivityDescription activityDescription = mActivityDescriptions.get(activityId);
             final Bitmap thumb = activityDescription.thumbnail;
             holder.thumbnailView.setImageBitmap(compositeBitmap(mGlowBitmap, thumb));
             holder.iconView.setImageDrawable(activityDescription.icon);
             holder.labelView.setText(activityDescription.label);
             holder.descriptionView.setText(activityDescription.description);
             holder.thumbnailView.setTag(activityDescription);
             holder.activityDescription = activityDescription;

             return convertView;
         }
     }

     public boolean isInContentArea(int x, int y) {
         // use mRecentsContainer's exact bounds to determine horizontal position
         final int l = mRecentsContainer.getLeft();
         final int r = mRecentsContainer.getRight();
         // use surrounding mRecentsGlowView's position in parent determine vertical bounds
         final int t = mRecentsGlowView.getTop();
         final int b = mRecentsGlowView.getBottom();
         return x >= l && x < r && y >= t && y < b;
     }

     public void show(boolean show, boolean animate) {
         if (animate) {
             if (mShowing != show) {
                 mShowing = show;
                 if (show) {
                     setVisibility(View.VISIBLE);
                 }
                 mChoreo.startAnimation(show);
             }
         } else {
             mShowing = show;
             setVisibility(show ? View.VISIBLE : View.GONE);
             mChoreo.jumpTo(show);
         }
     }

     /**
      * We need to be aligned at the bottom.  LinearLayout can't do this, so instead,
      * let LinearLayout do all the hard work, and then shift everything down to the bottom.
      */
     @Override
     protected void onLayout(boolean changed, int l, int t, int r, int b) {
         super.onLayout(changed, l, t, r, b);
         mChoreo.setPanelHeight(mRecentsContainer.getHeight());
     }

     /**
      * Whether the panel is showing, or, if it's animating, whether it will be
      * when the animation is done.
      */
     public boolean isShowing() {
         return mShowing;
     }

     private static class Choreographer implements Animator.AnimatorListener {
         // should group this into a multi-property animation
         private static final int OPEN_DURATION = 136;
         private static final int CLOSE_DURATION = 250;

         boolean mVisible;
         int mPanelHeight;
         View mRootView;
         View mScrimView;
         View mContentView;
         AnimatorSet mContentAnim;

         // the panel will start to appear this many px from the end
         final int HYPERSPACE_OFFRAMP = 200;

         public Choreographer(View root, View scrim, View content) {
             mRootView = root;
             mScrimView = scrim;
             mContentView = content;
         }

         void createAnimation(boolean appearing) {
             float start, end;

             if (DEBUG) Log.e(TAG, "createAnimation()", new Exception());

             // 0: on-screen
             // height: off-screen
             float y = mContentView.getTranslationY();
             if (appearing) {
                 // we want to go from near-the-top to the top, unless we're half-open in the right
                 // general vicinity
                 start = (y < HYPERSPACE_OFFRAMP) ? y : HYPERSPACE_OFFRAMP;
                 end = 0;
             } else {
                 start = y;
                 end = y + HYPERSPACE_OFFRAMP;
             }

             Animator posAnim = ObjectAnimator.ofFloat(mContentView, "translationY",
                     start, end);
             posAnim.setInterpolator(appearing
                     ? new android.view.animation.DecelerateInterpolator(2.5f)
                     : new android.view.animation.AccelerateInterpolator(2.5f));

             Animator glowAnim = ObjectAnimator.ofFloat(mContentView, "alpha",
                     mContentView.getAlpha(), appearing ? 1.0f : 0.0f);
             glowAnim.setInterpolator(appearing
                     ? new android.view.animation.AccelerateInterpolator(1.0f)
                     : new android.view.animation.DecelerateInterpolator(1.0f));

             Animator bgAnim = ObjectAnimator.ofInt(mScrimView.getBackground(),
                     "alpha", appearing ? 0 : 255, appearing ? 255 : 0);

             mContentAnim = new AnimatorSet();
             mContentAnim
                     .play(bgAnim)
                     .with(glowAnim)
                     .with(posAnim);
             mContentAnim.setDuration(appearing ? OPEN_DURATION : CLOSE_DURATION);
             mContentAnim.addListener(this);
         }

         void startAnimation(boolean appearing) {
             if (DEBUG) Slog.d(TAG, "startAnimation(appearing=" + appearing + ")");

             createAnimation(appearing);

             mContentView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
             mContentAnim.start();

             mVisible = appearing;
         }

         void jumpTo(boolean appearing) {
             mContentView.setTranslationY(appearing ? 0 : mPanelHeight);
         }

         public void setPanelHeight(int h) {
             if (DEBUG) Slog.d(TAG, "panelHeight=" + h);
             mPanelHeight = h;
         }

         public void onAnimationCancel(Animator animation) {
             if (DEBUG) Slog.d(TAG, "onAnimationCancel");
             // force this to zero so we close the window
             mVisible = false;
         }

         public void onAnimationEnd(Animator animation) {
             if (DEBUG) Slog.d(TAG, "onAnimationEnd");
             if (!mVisible) {
                 mRootView.setVisibility(View.GONE);
             }
             mContentView.setLayerType(View.LAYER_TYPE_NONE, null);
             mContentAnim = null;
         }

         public void onAnimationRepeat(Animator animation) {
         }

         public void onAnimationStart(Animator animation) {
         }
     }

     public void setBar(TabletStatusBar bar) {
         mBar = bar;
     }

     public RecentAppsPanel(Context context, AttributeSet attrs) {
         this(context, attrs, 0);
     }

     public RecentAppsPanel(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);

         Resources res = context.getResources();
         boolean xlarge = (res.getConfiguration().screenLayout
                 & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE;

         mIconDpi = xlarge ? DisplayMetrics.DENSITY_HIGH : res.getDisplayMetrics().densityDpi;
         mGlowBitmap = BitmapFactory.decodeResource(res, R.drawable.recents_thumbnail_bg);
     }

     @Override
     protected void onSizeChanged(int w, int h, int oldw, int oldh) {
         super.onSizeChanged(w, h, oldw, oldh);
         // Keep track of the last visible item in the list so we can restore it
         // to the bottom when the orientation changes.
         int childCount = mRecentsContainer.getChildCount();
         if (childCount > 0) {
             mLastVisibleItem = mRecentsContainer.getFirstVisiblePosition() + childCount - 1;
             View view = mRecentsContainer.getChildAt(childCount - 1);
             final int distanceFromBottom = mRecentsContainer.getHeight() - view.getTop();
             //final int distanceFromBottom = view.getHeight() + BOTTOM_OFFSET;

             // This has to happen post-layout, so run it "in the future"
             post(new Runnable() {
                 public void run() {
                     mRecentsContainer.setSelectionFromTop(mLastVisibleItem,
                             mRecentsContainer.getHeight() - distanceFromBottom);
                 }
             });
         }
     }

     @Override
     protected void onFinishInflate() {
         super.onFinishInflate();
         LayoutInflater inflater = (LayoutInflater)
         mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

         mRecentsContainer = (ListView) findViewById(R.id.recents_container);
         mCompatMode = (CheckBox) findViewById(R.id.recents_compat_mode);
         mCompatMode.setOnClickListener(new OnClickListener() {
             public void onClick(View v) {
                 final ActivityManager am = (ActivityManager)
                         mContext.getSystemService(Context.ACTIVITY_SERVICE);
                 am.setFrontActivityScreenCompatMode(ActivityManager.COMPAT_MODE_TOGGLE);
                 hide(true);
             }
         });
         View footer = inflater.inflate(R.layout.status_bar_recent_panel_footer,
                 mRecentsContainer, false);
         mRecentsContainer.setScrollbarFadingEnabled(true);
         mRecentsContainer.addFooterView(footer, null, false);
         mRecentsContainer.setAdapter(mListAdapter = new ActvityDescriptionAdapter(mContext));
         mRecentsContainer.setOnItemClickListener(this);
         final int leftPadding = mContext.getResources()
             .getDimensionPixelOffset(R.dimen.status_bar_recents_thumbnail_left_margin);
         mRecentsContainer.setOverScrollEffectPadding(leftPadding, 0);

         mRecentsGlowView = findViewById(R.id.recents_glow);
         mRecentsScrim = (View) findViewById(R.id.recents_bg_protect);
         mChoreo = new Choreographer(this, mRecentsScrim, mRecentsGlowView);
         mRecentsDismissButton = findViewById(R.id.recents_dismiss_button);
         mRecentsDismissButton.setOnClickListener(new OnClickListener() {
             public void onClick(View v) {
                 hide(true);
             }
         });

         // In order to save space, we make the background texture repeat in the Y direction
         if (mRecentsScrim != null && mRecentsScrim.getBackground() instanceof BitmapDrawable) {
             ((BitmapDrawable) mRecentsScrim.getBackground()).setTileModeY(TileMode.REPEAT);
         }
     }

     @Override
     protected void onVisibilityChanged(View changedView, int visibility) {
         super.onVisibilityChanged(changedView, visibility);
         if (DEBUG) Log.v(TAG, "onVisibilityChanged(" + changedView + ", " + visibility + ")");
         if (visibility == View.VISIBLE && changedView == this) {
             refreshApplicationList();
             post(new Runnable() {
                 public void run() {
                     mRecentsContainer.setSelection(mActivityDescriptions.size() - 1);
                 }
             });
         }
     }

     private Drawable getFullResDefaultActivityIcon() {
         return getFullResIcon(Resources.getSystem(),
                 com.android.internal.R.mipmap.sym_def_app_icon);
     }

     private Drawable getFullResIcon(Resources resources, int iconId) {
         return resources.getDrawableForDensity(iconId, mIconDpi);
     }

     private Drawable getFullResIcon(ResolveInfo info, PackageManager packageManager) {
         Resources resources;
         try {
             resources = packageManager.getResourcesForApplication(
                     info.activityInfo.applicationInfo);
         } catch (PackageManager.NameNotFoundException e) {
             resources = null;
         }
         if (resources != null) {
             int iconId = info.activityInfo.getIconResource();
             if (iconId != 0) {
                 return getFullResIcon(resources, iconId);
             }
         }
         return getFullResDefaultActivityIcon();
     }

     private ArrayList<ActivityDescription> getRecentTasks() {
         ArrayList<ActivityDescription> activityDescriptions = new ArrayList<ActivityDescription>();
         final PackageManager pm = mContext.getPackageManager();
         final ActivityManager am = (ActivityManager)
                 mContext.getSystemService(Context.ACTIVITY_SERVICE);

         final List<ActivityManager.RecentTaskInfo> recentTasks =
                 am.getRecentTasks(MAX_TASKS, ActivityManager.RECENT_IGNORE_UNAVAILABLE);

         ActivityInfo homeInfo = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME)
                     .resolveActivityInfo(pm, 0);

         int numTasks = recentTasks.size();

         // skip the first activity - assume it's either the home screen or the current app.
         final int first = 1;
         for (int i = first, index = 0; i < numTasks && (index < MAX_TASKS); ++i) {
             final ActivityManager.RecentTaskInfo recentInfo = recentTasks.get(i);

             Intent intent = new Intent(recentInfo.baseIntent);
             if (recentInfo.origActivity != null) {
                 intent.setComponent(recentInfo.origActivity);
             }

             // Skip the current home activity.
             if (homeInfo != null
                     && homeInfo.packageName.equals(intent.getComponent().getPackageName())
                     && homeInfo.name.equals(intent.getComponent().getClassName())) {
                 continue;
             }

             intent.setFlags((intent.getFlags()&~Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED)
                     | Intent.FLAG_ACTIVITY_NEW_TASK);
             final ResolveInfo resolveInfo = pm.resolveActivity(intent, 0);
             if (resolveInfo != null) {
                 final ActivityInfo info = resolveInfo.activityInfo;
                 final String title = info.loadLabel(pm).toString();
                 // Drawable icon = info.loadIcon(pm);
                 Drawable icon = getFullResIcon(resolveInfo, pm);
                 int id = recentTasks.get(i).id;
                 if (title != null && title.length() > 0 && icon != null) {
                     if (DEBUG) Log.v(TAG, "creating activity desc for id=" + id + ", label=" + title);
                     ActivityManager.TaskThumbnails thumbs = am.getTaskThumbnails(
                             recentInfo.persistentId);
                     ActivityDescription item = new ActivityDescription(
                             thumbs != null ? thumbs.mainThumbnail : null,
                             icon, title, recentInfo.description, intent, id,
                             index, info.packageName);
                     activityDescriptions.add(item);
                     ++index;
                 } else {
                     if (DEBUG) Log.v(TAG, "SKIPPING item " + id);
                 }
             }
         }
         return activityDescriptions;
     }

     ActivityDescription findActivityDescription(int id)
     {
         ActivityDescription desc = null;
         for (int i = 0; i < mActivityDescriptions.size(); i++) {
             ActivityDescription item = mActivityDescriptions.get(i);
             if (item != null && item.id == id) {
                 desc = item;
                 break;
             }
         }
         return desc;
     }

     private void updateShownCompatMode() {
         final ActivityManager am = (ActivityManager)
                 mContext.getSystemService(Context.ACTIVITY_SERVICE);
         int mode = am.getFrontActivityScreenCompatMode();
         switch (mode) {
             case ActivityManager.COMPAT_MODE_DISABLED:
                 mCompatMode.setVisibility(View.VISIBLE);
                 mCompatMode.setChecked(true);
                 break;
             case ActivityManager.COMPAT_MODE_ENABLED:
                 mCompatMode.setVisibility(View.VISIBLE);
                 mCompatMode.setChecked(false);
                 break;
             default:
                 mCompatMode.setVisibility(View.GONE);
                 break;
         }
     }

     private void refreshApplicationList() {
         mActivityDescriptions = getRecentTasks();
         mListAdapter.notifyDataSetInvalidated();
         if (mActivityDescriptions.size() > 0) {
             mLastVisibleItem = mActivityDescriptions.size() - 1; // scroll to bottom after reloading
             updateUiElements(getResources().getConfiguration());
             updateShownCompatMode();
         } else {
             // Immediately hide this panel
             hide(false);
         }
     }

     private Bitmap compositeBitmap(Bitmap background, Bitmap thumbnail) {
         Bitmap outBitmap = background.copy(background.getConfig(), true);
         if (thumbnail != null) {
             Canvas canvas = new Canvas(outBitmap);
             Paint paint = new Paint();
             paint.setAntiAlias(true);
             paint.setFilterBitmap(true);
             paint.setAlpha(255);
             final int srcWidth = thumbnail.getWidth();
             final int srcHeight = thumbnail.getHeight();
             canvas.drawBitmap(thumbnail,
                     new Rect(0, 0, srcWidth-1, srcHeight-1),
                     new RectF(GLOW_PADDING,
                             GLOW_PADDING - 7.0f,
                             outBitmap.getWidth() - GLOW_PADDING + 3.0f,
                             outBitmap.getHeight() - GLOW_PADDING + 7.0f), paint);
         }
         return outBitmap;
     }

     private void updateUiElements(Configuration config) {
         final int items = mActivityDescriptions.size();

         mRecentsContainer.setVisibility(items > 0 ? View.VISIBLE : View.GONE);
         mRecentsGlowView.setVisibility(items > 0 ? View.VISIBLE : View.GONE);
     }

     private void hide(boolean animate) {
         if (!animate) {
             setVisibility(View.GONE);
         }
         mBar.animateCollapse();
     }

     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
         ActivityDescription ad = ((ViewHolder) view.getTag()).activityDescription;
         final ActivityManager am = (ActivityManager)
                 getContext().getSystemService(Context.ACTIVITY_SERVICE);
         if (ad.id >= 0) {
             // This is an active task; it should just go to the foreground.
             am.moveTaskToFront(ad.id, ActivityManager.MOVE_TASK_WITH_HOME);
         } else {
             Intent intent = ad.intent;
             intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY
                     | Intent.FLAG_ACTIVITY_TASK_ON_HOME);
             if (DEBUG) Log.v(TAG, "Starting activity " + intent);
             getContext().startActivity(intent);
         }
         hide(true);
     }
 }
	/*
	* Copyright (C) 2010 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 com.android.systemui.statusbar.tablet;

	import java.util.ArrayList;
	import java.util.List;

	import android.animation.Animator;
	import android.animation.AnimatorSet;
	import android.animation.ObjectAnimator;
	import android.app.ActivityManager;
	import android.content.Context;
	import android.content.Intent;
	import android.content.pm.ActivityInfo;
	import android.content.pm.PackageManager;
	import android.content.pm.ResolveInfo;
	import android.content.res.Configuration;
	import android.content.res.Resources;
	import android.graphics.Bitmap;
	import android.graphics.BitmapFactory;
	import android.graphics.Canvas;
	import android.graphics.Matrix;
	import android.graphics.Paint;
	import android.graphics.Rect;
	import android.graphics.RectF;
	import android.graphics.Shader.TileMode;
	import android.graphics.drawable.BitmapDrawable;
	import android.graphics.drawable.Drawable;
	import android.util.AttributeSet;
	import android.util.DisplayMetrics;
	import android.util.Log;
	import android.util.Slog;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.AdapterView;
	import android.widget.AdapterView.OnItemClickListener;
	import android.widget.BaseAdapter;
	import android.widget.CheckBox;
	import android.widget.ImageView;
	import android.widget.ListView;
	import android.widget.RelativeLayout;
	import android.widget.TextView;

	import com.android.systemui.R;

	public class RecentAppsPanel extends RelativeLayout implements StatusBarPanel, OnItemClickListener {
	private static final int GLOW_PADDING = 15;
	private static final String TAG = "RecentAppsPanel";
	private static final boolean DEBUG = TabletStatusBar.DEBUG;
	private static final int DISPLAY_TASKS = 20;
	private static final int MAX_TASKS = DISPLAY_TASKS + 1; // allow extra for non-apps
	private TabletStatusBar mBar;
	private ArrayList<ActivityDescription> mActivityDescriptions;
	private int mIconDpi;
	private View mRecentsScrim;
	private View mRecentsGlowView;
	private ListView mRecentsContainer;
	private CheckBox mCompatMode;
	private Bitmap mGlowBitmap;
	private boolean mShowing;
	private Choreographer mChoreo;
	private View mRecentsDismissButton;
	private ActvityDescriptionAdapter mListAdapter;
	protected int mLastVisibleItem;

	static class ActivityDescription {
	int id;
	Bitmap thumbnail; // generated by Activity.onCreateThumbnail()
	Drawable icon; // application package icon
	String label; // application package label
	CharSequence description; // generated by Activity.onCreateDescription()
	Intent intent; // launch intent for application
	Matrix matrix; // arbitrary rotation matrix to correct orientation
	String packageName; // used to override animations (see onClick())
	int position; // position in list

	public ActivityDescription(Bitmap _thumbnail,
	Drawable _icon, String _label, CharSequence _desc, Intent _intent,
	int _id, int _pos, String _packageName)
	{
	thumbnail = _thumbnail;
	icon = _icon;
	label = _label;
	description = _desc;
	intent = _intent;
	id = _id;
	position = _pos;
	packageName = _packageName;
	}
	};

	/* package */ final static class ViewHolder {
	private ImageView thumbnailView;
	private ImageView iconView;
	private TextView labelView;
	private TextView descriptionView;
	private ActivityDescription activityDescription;
	}

	/* package */ final class ActvityDescriptionAdapter extends BaseAdapter {
	private LayoutInflater mInflater;

	public ActvityDescriptionAdapter(Context context) {
	mInflater = LayoutInflater.from(context);
	}

	public int getCount() {
	return mActivityDescriptions != null ? mActivityDescriptions.size() : 0;
	}

	public Object getItem(int position) {
	return position; // we only need the index
	}

	public long getItemId(int position) {
	return position; // we just need something unique for this position
	}

	public View getView(int position, View convertView, ViewGroup parent) {
	ViewHolder holder;
	if (convertView == null) {
	convertView = mInflater.inflate(R.layout.status_bar_recent_item, null);
	holder = new ViewHolder();
	holder.thumbnailView = (ImageView) convertView.findViewById(R.id.app_thumbnail);
	holder.iconView = (ImageView) convertView.findViewById(R.id.app_icon);
	holder.labelView = (TextView) convertView.findViewById(R.id.app_label);
	holder.descriptionView = (TextView) convertView.findViewById(R.id.app_description);
	convertView.setTag(holder);
	} else {
	holder = (ViewHolder) convertView.getTag();
	}

	// activityId is reverse since most recent appears at the bottom...
	final int activityId = mActivityDescriptions.size() - position - 1;

	final ActivityDescription activityDescription = mActivityDescriptions.get(activityId);
	final Bitmap thumb = activityDescription.thumbnail;
	holder.thumbnailView.setImageBitmap(compositeBitmap(mGlowBitmap, thumb));
	holder.iconView.setImageDrawable(activityDescription.icon);
	holder.labelView.setText(activityDescription.label);
	holder.descriptionView.setText(activityDescription.description);
	holder.thumbnailView.setTag(activityDescription);
	holder.activityDescription = activityDescription;

	return convertView;
	}
	}

	public boolean isInContentArea(int x, int y) {
	// use mRecentsContainer's exact bounds to determine horizontal position
	final int l = mRecentsContainer.getLeft();
	final int r = mRecentsContainer.getRight();
	// use surrounding mRecentsGlowView's position in parent determine vertical bounds
	final int t = mRecentsGlowView.getTop();
	final int b = mRecentsGlowView.getBottom();
	return x >= l && x < r && y >= t && y < b;
	}

	public void show(boolean show, boolean animate) {
	if (animate) {
	if (mShowing != show) {
	mShowing = show;
	if (show) {
	setVisibility(View.VISIBLE);
	}
	mChoreo.startAnimation(show);
	}
	} else {
	mShowing = show;
	setVisibility(show ? View.VISIBLE : View.GONE);
	mChoreo.jumpTo(show);
	}
	}

	/**
	* We need to be aligned at the bottom. LinearLayout can't do this, so instead,
	* let LinearLayout do all the hard work, and then shift everything down to the bottom.
	*/
	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
	super.onLayout(changed, l, t, r, b);
	mChoreo.setPanelHeight(mRecentsContainer.getHeight());
	}

	/**
	* Whether the panel is showing, or, if it's animating, whether it will be
	* when the animation is done.
	*/
	public boolean isShowing() {
	return mShowing;
	}

	private static class Choreographer implements Animator.AnimatorListener {
	// should group this into a multi-property animation
	private static final int OPEN_DURATION = 136;
	private static final int CLOSE_DURATION = 250;

	boolean mVisible;
	int mPanelHeight;
	View mRootView;
	View mScrimView;
	View mContentView;
	AnimatorSet mContentAnim;

	// the panel will start to appear this many px from the end
	final int HYPERSPACE_OFFRAMP = 200;

	public Choreographer(View root, View scrim, View content) {
	mRootView = root;
	mScrimView = scrim;
	mContentView = content;
	}

	void createAnimation(boolean appearing) {
	float start, end;

	if (DEBUG) Log.e(TAG, "createAnimation()", new Exception());

	// 0: on-screen
	// height: off-screen
	float y = mContentView.getTranslationY();
	if (appearing) {
	// we want to go from near-the-top to the top, unless we're half-open in the right
	// general vicinity
	start = (y < HYPERSPACE_OFFRAMP) ? y : HYPERSPACE_OFFRAMP;
	end = 0;
	} else {
	start = y;
	end = y + HYPERSPACE_OFFRAMP;
	}

	Animator posAnim = ObjectAnimator.ofFloat(mContentView, "translationY",
	start, end);
	posAnim.setInterpolator(appearing
	? new android.view.animation.DecelerateInterpolator(2.5f)
	: new android.view.animation.AccelerateInterpolator(2.5f));

	Animator glowAnim = ObjectAnimator.ofFloat(mContentView, "alpha",
	mContentView.getAlpha(), appearing ? 1.0f : 0.0f);
	glowAnim.setInterpolator(appearing
	? new android.view.animation.AccelerateInterpolator(1.0f)
	: new android.view.animation.DecelerateInterpolator(1.0f));

	Animator bgAnim = ObjectAnimator.ofInt(mScrimView.getBackground(),
	"alpha", appearing ? 0 : 255, appearing ? 255 : 0);

	mContentAnim = new AnimatorSet();
	mContentAnim
	.play(bgAnim)
	.with(glowAnim)
	.with(posAnim);
	mContentAnim.setDuration(appearing ? OPEN_DURATION : CLOSE_DURATION);
	mContentAnim.addListener(this);
	}

	void startAnimation(boolean appearing) {
	if (DEBUG) Slog.d(TAG, "startAnimation(appearing=" + appearing + ")");

	createAnimation(appearing);

	mContentView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
	mContentAnim.start();

	mVisible = appearing;
	}

	void jumpTo(boolean appearing) {
	mContentView.setTranslationY(appearing ? 0 : mPanelHeight);
	}

	public void setPanelHeight(int h) {
	if (DEBUG) Slog.d(TAG, "panelHeight=" + h);
	mPanelHeight = h;
	}

	public void onAnimationCancel(Animator animation) {
	if (DEBUG) Slog.d(TAG, "onAnimationCancel");
	// force this to zero so we close the window
	mVisible = false;
	}

	public void onAnimationEnd(Animator animation) {
	if (DEBUG) Slog.d(TAG, "onAnimationEnd");
	if (!mVisible) {
	mRootView.setVisibility(View.GONE);
	}
	mContentView.setLayerType(View.LAYER_TYPE_NONE, null);
	mContentAnim = null;
	}

	public void onAnimationRepeat(Animator animation) {
	}

	public void onAnimationStart(Animator animation) {
	}
	}

	public void setBar(TabletStatusBar bar) {
	mBar = bar;
	}

	public RecentAppsPanel(Context context, AttributeSet attrs) {
	this(context, attrs, 0);
	}

	public RecentAppsPanel(Context context, AttributeSet attrs, int defStyle) {
	super(context, attrs, defStyle);

	Resources res = context.getResources();
	boolean xlarge = (res.getConfiguration().screenLayout
	& Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE;

	mIconDpi = xlarge ? DisplayMetrics.DENSITY_HIGH : res.getDisplayMetrics().densityDpi;
	mGlowBitmap = BitmapFactory.decodeResource(res, R.drawable.recents_thumbnail_bg);
	}

	@Override
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
	super.onSizeChanged(w, h, oldw, oldh);
	// Keep track of the last visible item in the list so we can restore it
	// to the bottom when the orientation changes.
	int childCount = mRecentsContainer.getChildCount();
	if (childCount > 0) {
	mLastVisibleItem = mRecentsContainer.getFirstVisiblePosition() + childCount - 1;
	View view = mRecentsContainer.getChildAt(childCount - 1);
	final int distanceFromBottom = mRecentsContainer.getHeight() - view.getTop();
	//final int distanceFromBottom = view.getHeight() + BOTTOM_OFFSET;

	// This has to happen post-layout, so run it "in the future"
	post(new Runnable() {
	public void run() {
	mRecentsContainer.setSelectionFromTop(mLastVisibleItem,
	mRecentsContainer.getHeight() - distanceFromBottom);
	}
	});
	}
	}

	@Override
	protected void onFinishInflate() {
	super.onFinishInflate();
	LayoutInflater inflater = (LayoutInflater)
	mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

	mRecentsContainer = (ListView) findViewById(R.id.recents_container);
	mCompatMode = (CheckBox) findViewById(R.id.recents_compat_mode);
	mCompatMode.setOnClickListener(new OnClickListener() {
	public void onClick(View v) {
	final ActivityManager am = (ActivityManager)
	mContext.getSystemService(Context.ACTIVITY_SERVICE);
	am.setFrontActivityScreenCompatMode(ActivityManager.COMPAT_MODE_TOGGLE);
	hide(true);
	}
	});
	View footer = inflater.inflate(R.layout.status_bar_recent_panel_footer,
	mRecentsContainer, false);
	mRecentsContainer.setScrollbarFadingEnabled(true);
	mRecentsContainer.addFooterView(footer, null, false);
	mRecentsContainer.setAdapter(mListAdapter = new ActvityDescriptionAdapter(mContext));
	mRecentsContainer.setOnItemClickListener(this);
	final int leftPadding = mContext.getResources()
	.getDimensionPixelOffset(R.dimen.status_bar_recents_thumbnail_left_margin);
	mRecentsContainer.setOverScrollEffectPadding(leftPadding, 0);

	mRecentsGlowView = findViewById(R.id.recents_glow);
	mRecentsScrim = (View) findViewById(R.id.recents_bg_protect);
	mChoreo = new Choreographer(this, mRecentsScrim, mRecentsGlowView);
	mRecentsDismissButton = findViewById(R.id.recents_dismiss_button);
	mRecentsDismissButton.setOnClickListener(new OnClickListener() {
	public void onClick(View v) {
	hide(true);
	}
	});

	// In order to save space, we make the background texture repeat in the Y direction
	if (mRecentsScrim != null && mRecentsScrim.getBackground() instanceof BitmapDrawable) {
	((BitmapDrawable) mRecentsScrim.getBackground()).setTileModeY(TileMode.REPEAT);
	}
	}

	@Override
	protected void onVisibilityChanged(View changedView, int visibility) {
	super.onVisibilityChanged(changedView, visibility);
	if (DEBUG) Log.v(TAG, "onVisibilityChanged(" + changedView + ", " + visibility + ")");
	if (visibility == View.VISIBLE && changedView == this) {
	refreshApplicationList();
	post(new Runnable() {
	public void run() {
	mRecentsContainer.setSelection(mActivityDescriptions.size() - 1);
	}
	});
	}
	}

	private Drawable getFullResDefaultActivityIcon() {
	return getFullResIcon(Resources.getSystem(),
	com.android.internal.R.mipmap.sym_def_app_icon);
	}

	private Drawable getFullResIcon(Resources resources, int iconId) {
	return resources.getDrawableForDensity(iconId, mIconDpi);
	}

	private Drawable getFullResIcon(ResolveInfo info, PackageManager packageManager) {
	Resources resources;
	try {
	resources = packageManager.getResourcesForApplication(
	info.activityInfo.applicationInfo);
	} catch (PackageManager.NameNotFoundException e) {
	resources = null;
	}
	if (resources != null) {
	int iconId = info.activityInfo.getIconResource();
	if (iconId != 0) {
	return getFullResIcon(resources, iconId);
	}
	}
	return getFullResDefaultActivityIcon();
	}

	private ArrayList<ActivityDescription> getRecentTasks() {
	ArrayList<ActivityDescription> activityDescriptions = new ArrayList<ActivityDescription>();
	final PackageManager pm = mContext.getPackageManager();
	final ActivityManager am = (ActivityManager)
	mContext.getSystemService(Context.ACTIVITY_SERVICE);

	final List<ActivityManager.RecentTaskInfo> recentTasks =
	am.getRecentTasks(MAX_TASKS, ActivityManager.RECENT_IGNORE_UNAVAILABLE);

	ActivityInfo homeInfo = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME)
	.resolveActivityInfo(pm, 0);

	int numTasks = recentTasks.size();

	// skip the first activity - assume it's either the home screen or the current app.
	final int first = 1;
	for (int i = first, index = 0; i < numTasks && (index < MAX_TASKS); ++i) {
	final ActivityManager.RecentTaskInfo recentInfo = recentTasks.get(i);

	Intent intent = new Intent(recentInfo.baseIntent);
	if (recentInfo.origActivity != null) {
	intent.setComponent(recentInfo.origActivity);
	}

	// Skip the current home activity.
	if (homeInfo != null
	&& homeInfo.packageName.equals(intent.getComponent().getPackageName())
	&& homeInfo.name.equals(intent.getComponent().getClassName())) {
	continue;
	}

	intent.setFlags((intent.getFlags()&~Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED)
	\| Intent.FLAG_ACTIVITY_NEW_TASK);
	final ResolveInfo resolveInfo = pm.resolveActivity(intent, 0);
	if (resolveInfo != null) {
	final ActivityInfo info = resolveInfo.activityInfo;
	final String title = info.loadLabel(pm).toString();
	// Drawable icon = info.loadIcon(pm);
	Drawable icon = getFullResIcon(resolveInfo, pm);
	int id = recentTasks.get(i).id;
	if (title != null && title.length() > 0 && icon != null) {
	if (DEBUG) Log.v(TAG, "creating activity desc for id=" + id + ", label=" + title);
	ActivityManager.TaskThumbnails thumbs = am.getTaskThumbnails(
	recentInfo.persistentId);
	ActivityDescription item = new ActivityDescription(
	thumbs != null ? thumbs.mainThumbnail : null,
	icon, title, recentInfo.description, intent, id,
	index, info.packageName);
	activityDescriptions.add(item);
	++index;
	} else {
	if (DEBUG) Log.v(TAG, "SKIPPING item " + id);
	}
	}
	}
	return activityDescriptions;
	}

	ActivityDescription findActivityDescription(int id)
	{
	ActivityDescription desc = null;
	for (int i = 0; i < mActivityDescriptions.size(); i++) {
	ActivityDescription item = mActivityDescriptions.get(i);
	if (item != null && item.id == id) {
	desc = item;
	break;
	}
	}
	return desc;
	}

	private void updateShownCompatMode() {
	final ActivityManager am = (ActivityManager)
	mContext.getSystemService(Context.ACTIVITY_SERVICE);
	int mode = am.getFrontActivityScreenCompatMode();
	switch (mode) {
	case ActivityManager.COMPAT_MODE_DISABLED:
	mCompatMode.setVisibility(View.VISIBLE);
	mCompatMode.setChecked(true);
	break;
	case ActivityManager.COMPAT_MODE_ENABLED:
	mCompatMode.setVisibility(View.VISIBLE);
	mCompatMode.setChecked(false);
	break;
	default:
	mCompatMode.setVisibility(View.GONE);
	break;
	}
	}

	private void refreshApplicationList() {
	mActivityDescriptions = getRecentTasks();
	mListAdapter.notifyDataSetInvalidated();
	if (mActivityDescriptions.size() > 0) {
	mLastVisibleItem = mActivityDescriptions.size() - 1; // scroll to bottom after reloading
	updateUiElements(getResources().getConfiguration());
	updateShownCompatMode();
	} else {
	// Immediately hide this panel
	hide(false);
	}
	}

	private Bitmap compositeBitmap(Bitmap background, Bitmap thumbnail) {
	Bitmap outBitmap = background.copy(background.getConfig(), true);
	if (thumbnail != null) {
	Canvas canvas = new Canvas(outBitmap);
	Paint paint = new Paint();
	paint.setAntiAlias(true);
	paint.setFilterBitmap(true);
	paint.setAlpha(255);
	final int srcWidth = thumbnail.getWidth();
	final int srcHeight = thumbnail.getHeight();
	canvas.drawBitmap(thumbnail,
	new Rect(0, 0, srcWidth-1, srcHeight-1),
	new RectF(GLOW_PADDING,
	GLOW_PADDING - 7.0f,
	outBitmap.getWidth() - GLOW_PADDING + 3.0f,
	outBitmap.getHeight() - GLOW_PADDING + 7.0f), paint);
	}
	return outBitmap;
	}

	private void updateUiElements(Configuration config) {
	final int items = mActivityDescriptions.size();

	mRecentsContainer.setVisibility(items > 0 ? View.VISIBLE : View.GONE);
	mRecentsGlowView.setVisibility(items > 0 ? View.VISIBLE : View.GONE);
	}

	private void hide(boolean animate) {
	if (!animate) {
	setVisibility(View.GONE);
	}
	mBar.animateCollapse();
	}

	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
	ActivityDescription ad = ((ViewHolder) view.getTag()).activityDescription;
	final ActivityManager am = (ActivityManager)
	getContext().getSystemService(Context.ACTIVITY_SERVICE);
	if (ad.id >= 0) {
	// This is an active task; it should just go to the foreground.
	am.moveTaskToFront(ad.id, ActivityManager.MOVE_TASK_WITH_HOME);
	} else {
	Intent intent = ad.intent;
	intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY
	\| Intent.FLAG_ACTIVITY_TASK_ON_HOME);
	if (DEBUG) Log.v(TAG, "Starting activity " + intent);
	getContext().startActivity(intent);
	}
	hide(true);
	}
	}