| /* |
| * Copyright (C) 2008 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.appwidget; |
| |
| import android.content.Context; |
| import android.content.pm.PackageManager; |
| import android.graphics.Bitmap; |
| import android.graphics.Canvas; |
| import android.graphics.Color; |
| import android.graphics.Paint; |
| import android.os.SystemClock; |
| import android.util.Log; |
| import android.view.Gravity; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.FrameLayout; |
| import android.widget.RemoteViews; |
| import android.widget.TextView; |
| |
| /** |
| * Provides the glue to show AppWidget views. This class offers automatic animation |
| * between updates, and will try recycling old views for each incoming |
| * {@link RemoteViews}. |
| */ |
| public class AppWidgetHostView extends FrameLayout { |
| static final String TAG = "AppWidgetHostView"; |
| static final boolean LOGD = false; |
| static final boolean CROSSFADE = false; |
| |
| static final int VIEW_MODE_NOINIT = 0; |
| static final int VIEW_MODE_CONTENT = 1; |
| static final int VIEW_MODE_ERROR = 2; |
| static final int VIEW_MODE_DEFAULT = 3; |
| |
| static final int FADE_DURATION = 1000; |
| |
| // When we're inflating the initialLayout for a AppWidget, we only allow |
| // views that are allowed in RemoteViews. |
| static final LayoutInflater.Filter sInflaterFilter = new LayoutInflater.Filter() { |
| public boolean onLoadClass(Class clazz) { |
| return clazz.isAnnotationPresent(RemoteViews.RemoteView.class); |
| } |
| }; |
| |
| Context mContext; |
| |
| int mAppWidgetId; |
| AppWidgetProviderInfo mInfo; |
| View mView; |
| int mViewMode = VIEW_MODE_NOINIT; |
| int mLayoutId = -1; |
| long mFadeStartTime = -1; |
| Bitmap mOld; |
| Paint mOldPaint = new Paint(); |
| |
| /** |
| * Create a host view. Uses default fade animations. |
| */ |
| public AppWidgetHostView(Context context) { |
| this(context, android.R.anim.fade_in, android.R.anim.fade_out); |
| } |
| |
| /** |
| * Create a host view. Uses specified animations when pushing |
| * {@link #updateAppWidget(RemoteViews)}. |
| * |
| * @param animationIn Resource ID of in animation to use |
| * @param animationOut Resource ID of out animation to use |
| */ |
| @SuppressWarnings({"UnusedDeclaration"}) |
| public AppWidgetHostView(Context context, int animationIn, int animationOut) { |
| super(context); |
| mContext = context; |
| } |
| |
| /** |
| * Set the AppWidget that will be displayed by this view. |
| */ |
| public void setAppWidget(int appWidgetId, AppWidgetProviderInfo info) { |
| mAppWidgetId = appWidgetId; |
| mInfo = info; |
| } |
| |
| public int getAppWidgetId() { |
| return mAppWidgetId; |
| } |
| |
| public AppWidgetProviderInfo getAppWidgetInfo() { |
| return mInfo; |
| } |
| |
| /** |
| * Process a set of {@link RemoteViews} coming in as an update from the |
| * AppWidget provider. Will animate into these new views as needed. |
| */ |
| public void updateAppWidget(RemoteViews remoteViews) { |
| if (LOGD) Log.d(TAG, "updateAppWidget called mOld=" + mOld); |
| |
| boolean recycled = false; |
| View content = null; |
| Exception exception = null; |
| |
| // Capture the old view into a bitmap so we can do the crossfade. |
| if (CROSSFADE) { |
| if (mFadeStartTime < 0) { |
| if (mView != null) { |
| final int width = mView.getWidth(); |
| final int height = mView.getHeight(); |
| try { |
| mOld = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); |
| } catch (OutOfMemoryError e) { |
| // we just won't do the fade |
| mOld = null; |
| } |
| if (mOld != null) { |
| //mView.drawIntoBitmap(mOld); |
| } |
| } |
| } |
| } |
| |
| if (remoteViews == null) { |
| if (mViewMode == VIEW_MODE_DEFAULT) { |
| // We've already done this -- nothing to do. |
| return; |
| } |
| content = getDefaultView(); |
| mLayoutId = -1; |
| mViewMode = VIEW_MODE_DEFAULT; |
| } else { |
| int layoutId = remoteViews.getLayoutId(); |
| |
| // If our stale view has been prepared to match active, and the new |
| // layout matches, try recycling it |
| if (content == null && layoutId == mLayoutId) { |
| try { |
| remoteViews.reapply(mContext, mView); |
| content = mView; |
| recycled = true; |
| if (LOGD) Log.d(TAG, "was able to recycled existing layout"); |
| } catch (RuntimeException e) { |
| exception = e; |
| } |
| } |
| |
| // Try normal RemoteView inflation |
| if (content == null) { |
| try { |
| content = remoteViews.apply(mContext, this); |
| if (LOGD) Log.d(TAG, "had to inflate new layout"); |
| } catch (RuntimeException e) { |
| exception = e; |
| } |
| } |
| |
| mLayoutId = layoutId; |
| mViewMode = VIEW_MODE_CONTENT; |
| } |
| |
| if (content == null) { |
| if (mViewMode == VIEW_MODE_ERROR) { |
| // We've already done this -- nothing to do. |
| return ; |
| } |
| Log.w(TAG, "updateAppWidget couldn't find any view, using error view", exception); |
| content = getErrorView(); |
| mViewMode = VIEW_MODE_ERROR; |
| } |
| |
| if (!recycled) { |
| prepareView(content); |
| addView(content); |
| } |
| |
| if (mView != content) { |
| removeView(mView); |
| mView = content; |
| } |
| |
| if (CROSSFADE) { |
| if (mFadeStartTime < 0) { |
| // if there is already an animation in progress, don't do anything -- |
| // the new view will pop in on top of the old one during the cross fade, |
| // and that looks okay. |
| mFadeStartTime = SystemClock.uptimeMillis(); |
| invalidate(); |
| } |
| } |
| } |
| |
| protected boolean drawChild(Canvas canvas, View child, long drawingTime) { |
| if (CROSSFADE) { |
| int alpha; |
| int l = child.getLeft(); |
| int t = child.getTop(); |
| if (mFadeStartTime > 0) { |
| alpha = (int)(((drawingTime-mFadeStartTime)*255)/FADE_DURATION); |
| if (alpha > 255) { |
| alpha = 255; |
| } |
| Log.d(TAG, "drawChild alpha=" + alpha + " l=" + l + " t=" + t |
| + " w=" + child.getWidth()); |
| if (alpha != 255 && mOld != null) { |
| mOldPaint.setAlpha(255-alpha); |
| //canvas.drawBitmap(mOld, l, t, mOldPaint); |
| } |
| } else { |
| alpha = 255; |
| } |
| int restoreTo = canvas.saveLayerAlpha(l, t, child.getWidth(), child.getHeight(), alpha, |
| Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); |
| boolean rv = super.drawChild(canvas, child, drawingTime); |
| canvas.restoreToCount(restoreTo); |
| if (alpha < 255) { |
| invalidate(); |
| } else { |
| mFadeStartTime = -1; |
| if (mOld != null) { |
| mOld.recycle(); |
| mOld = null; |
| } |
| } |
| return rv; |
| } else { |
| return super.drawChild(canvas, child, drawingTime); |
| } |
| } |
| |
| /** |
| * Prepare the given view to be shown. This might include adjusting |
| * {@link FrameLayout.LayoutParams} before inserting. |
| */ |
| protected void prepareView(View view) { |
| // Take requested dimensions from parent, but apply default gravity. |
| ViewGroup.LayoutParams requested = view.getLayoutParams(); |
| if (requested == null) { |
| requested = new FrameLayout.LayoutParams(LayoutParams.FILL_PARENT, |
| LayoutParams.FILL_PARENT); |
| } |
| |
| FrameLayout.LayoutParams params = |
| new FrameLayout.LayoutParams(requested.width, requested.height); |
| params.gravity = Gravity.CENTER; |
| view.setLayoutParams(params); |
| } |
| |
| /** |
| * Inflate and return the default layout requested by AppWidget provider. |
| */ |
| protected View getDefaultView() { |
| View defaultView = null; |
| Exception exception = null; |
| |
| try { |
| if (mInfo != null) { |
| Context theirContext = mContext.createPackageContext( |
| mInfo.provider.getPackageName(), Context.CONTEXT_RESTRICTED); |
| LayoutInflater inflater = (LayoutInflater) |
| theirContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); |
| inflater = inflater.cloneInContext(theirContext); |
| inflater.setFilter(sInflaterFilter); |
| defaultView = inflater.inflate(mInfo.initialLayout, this, false); |
| } else { |
| Log.w(TAG, "can't inflate defaultView because mInfo is missing"); |
| } |
| } catch (PackageManager.NameNotFoundException e) { |
| exception = e; |
| } catch (RuntimeException e) { |
| exception = e; |
| } |
| |
| if (exception != null && LOGD) { |
| Log.w(TAG, "Error inflating AppWidget " + mInfo, exception); |
| } |
| |
| if (defaultView == null) { |
| if (LOGD) Log.d(TAG, "getDefaultView couldn't find any view, so inflating error"); |
| defaultView = getErrorView(); |
| } |
| |
| return defaultView; |
| } |
| |
| /** |
| * Inflate and return a view that represents an error state. |
| */ |
| protected View getErrorView() { |
| TextView tv = new TextView(mContext); |
| tv.setText(com.android.internal.R.string.gadget_host_error_inflating); |
| // TODO: get this color from somewhere. |
| tv.setBackgroundColor(Color.argb(127, 0, 0, 0)); |
| return tv; |
| } |
| } |