/*
* 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.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.util.Config;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
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
*/
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(), 0 /* no flags */);
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;
}
}
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