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/*
* Copyright (C) 2009 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.service.wallpaper;
import com.android.internal.os.HandlerCaller;
import com.android.internal.view.BaseIWindow;
import com.android.internal.view.BaseSurfaceHolder;
import android.app.Service;
import android.content.Intent;
import android.graphics.Rect;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.RemoteException;
import android.util.Log;
import android.view.Gravity;
import android.view.IWindowSession;
import android.view.SurfaceHolder;
import android.view.View;
import android.view.ViewRoot;
import android.view.WindowManager;
import android.view.WindowManagerImpl;
/**
* A wallpaper service is responsible for showing a live wallpaper behind
* applications that would like to sit on top of it.
* @hide Live Wallpaper
*/
public abstract class WallpaperService extends Service {
/**
* The {@link Intent} that must be declared as handled by the service.
*/
public static final String SERVICE_INTERFACE =
"android.service.wallpaper.WallpaperService";
static final String TAG = "WallpaperService";
static final boolean DEBUG = true;
private static final int DO_ATTACH = 10;
private static final int DO_DETACH = 20;
private static final int MSG_UPDATE_SURFACE = 10000;
/**
* The actual implementation of a wallpaper. A wallpaper service may
* have multiple instances running (for example as a real wallpaper
* and as a preview), each of which is represented by its own Engine
* instance.
*/
public class Engine {
IWallpaperEngineWrapper mIWallpaperEngine;
// Copies from mIWallpaperEngine.
HandlerCaller mCaller;
IWallpaperConnection mConnection;
IBinder mWindowToken;
boolean mInitializing = true;
// Current window state.
boolean mCreated;
boolean mIsCreating;
boolean mDrawingAllowed;
int mWidth;
int mHeight;
int mFormat;
int mType;
boolean mDestroyReportNeeded;
final Rect mVisibleInsets = new Rect();
final Rect mWinFrame = new Rect();
final Rect mContentInsets = new Rect();
final WindowManager.LayoutParams mLayout
= new WindowManager.LayoutParams();
IWindowSession mSession;
final BaseSurfaceHolder mSurfaceHolder = new BaseSurfaceHolder() {
@Override
public boolean onAllowLockCanvas() {
return mDrawingAllowed;
}
@Override
public void onRelayoutContainer() {
Message msg = mCaller.obtainMessage(MSG_UPDATE_SURFACE);
mCaller.sendMessage(msg);
}
@Override
public void onUpdateSurface() {
Message msg = mCaller.obtainMessage(MSG_UPDATE_SURFACE);
mCaller.sendMessage(msg);
}
public boolean isCreating() {
return mIsCreating;
}
public void setKeepScreenOn(boolean screenOn) {
// Ignore.
}
};
final BaseIWindow mWindow = new BaseIWindow() {
};
public void onAttach(SurfaceHolder surfaceHolder) {
}
public void onDetach() {
}
public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
public void onSurfaceCreated(SurfaceHolder holder) {
}
public void onSurfaceDestroyed(SurfaceHolder holder) {
}
void updateSurface(boolean force) {
int myWidth = mSurfaceHolder.getRequestedWidth();
if (myWidth <= 0) myWidth = mIWallpaperEngine.mReqWidth;
int myHeight = mSurfaceHolder.getRequestedHeight();
if (myHeight <= 0) myHeight = mIWallpaperEngine.mReqHeight;
final boolean creating = !mCreated;
final boolean formatChanged = mFormat != mSurfaceHolder.getRequestedFormat();
final boolean sizeChanged = mWidth != myWidth || mHeight != myHeight;
final boolean typeChanged = mType != mSurfaceHolder.getRequestedType();
if (force || creating || formatChanged || sizeChanged || typeChanged) {
if (DEBUG) Log.i(TAG, "Changes: creating=" + creating
+ " format=" + formatChanged + " size=" + sizeChanged);
try {
mWidth = myWidth;
mHeight = myHeight;
mFormat = mSurfaceHolder.getRequestedFormat();
mType = mSurfaceHolder.getRequestedType();
// Scaling/Translate window's layout here because mLayout is not used elsewhere.
// Places the window relative
mLayout.x = 0;
mLayout.y = 0;
mLayout.width = myWidth;
mLayout.height = myHeight;
mLayout.format = mFormat;
mLayout.flags |=WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS
| WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
;
mLayout.memoryType = mType;
mLayout.token = mWindowToken;
if (!mCreated) {
mLayout.type = WindowManager.LayoutParams.TYPE_WALLPAPER;
mLayout.gravity = Gravity.LEFT|Gravity.TOP;
mSession.add(mWindow, mLayout, View.VISIBLE, mContentInsets);
}
mSurfaceHolder.mSurfaceLock.lock();
mDrawingAllowed = true;
final int relayoutResult = mSession.relayout(
mWindow, mLayout, mWidth, mHeight,
View.VISIBLE, false, mWinFrame, mContentInsets,
mVisibleInsets, mSurfaceHolder.mSurface);
if (DEBUG) Log.i(TAG, "New surface: " + mSurfaceHolder.mSurface
+ ", frame=" + mWinFrame);
mSurfaceHolder.mSurfaceLock.unlock();
try {
mDestroyReportNeeded = true;
SurfaceHolder.Callback callbacks[] = null;
synchronized (mSurfaceHolder.mCallbacks) {
final int N = mSurfaceHolder.mCallbacks.size();
if (N > 0) {
callbacks = new SurfaceHolder.Callback[N];
mSurfaceHolder.mCallbacks.toArray(callbacks);
}
}
if (!mCreated) {
mIsCreating = true;
onSurfaceCreated(mSurfaceHolder);
if (callbacks != null) {
for (SurfaceHolder.Callback c : callbacks) {
c.surfaceCreated(mSurfaceHolder);
}
}
}
if (creating || formatChanged || sizeChanged) {
onSurfaceChanged(mSurfaceHolder, mFormat, mWidth, mHeight);
if (callbacks != null) {
for (SurfaceHolder.Callback c : callbacks) {
c.surfaceChanged(mSurfaceHolder, mFormat, mWidth, mHeight);
}
}
}
} finally {
mIsCreating = false;
mCreated = true;
if (creating || (relayoutResult&WindowManagerImpl.RELAYOUT_FIRST_TIME) != 0) {
mSession.finishDrawing(mWindow);
}
}
} catch (RemoteException ex) {
}
if (DEBUG) Log.v(
TAG, "Layout: x=" + mLayout.x + " y=" + mLayout.y +
" w=" + mLayout.width + " h=" + mLayout.height);
}
}
void attach(IWallpaperEngineWrapper wrapper) {
mIWallpaperEngine = wrapper;
mCaller = wrapper.mCaller;
mConnection = wrapper.mConnection;
mWindowToken = wrapper.mWindowToken;
mSurfaceHolder.setSizeFromLayout();
mInitializing = true;
mSession = ViewRoot.getWindowSession(getMainLooper());
mWindow.setSession(mSession);
onAttach(mSurfaceHolder);
mInitializing = false;
updateSurface(false);
}
void detach() {
onDetach();
if (mDestroyReportNeeded) {
mDestroyReportNeeded = false;
SurfaceHolder.Callback callbacks[];
synchronized (mSurfaceHolder.mCallbacks) {
callbacks = new SurfaceHolder.Callback[
mSurfaceHolder.mCallbacks.size()];
mSurfaceHolder.mCallbacks.toArray(callbacks);
}
for (SurfaceHolder.Callback c : callbacks) {
c.surfaceDestroyed(mSurfaceHolder);
}
}
if (mCreated) {
try {
mSession.remove(mWindow);
} catch (RemoteException e) {
}
mSurfaceHolder.mSurface.clear();
mCreated = false;
}
}
}
class IWallpaperEngineWrapper extends IWallpaperEngine.Stub
implements HandlerCaller.Callback {
private final HandlerCaller mCaller;
final IWallpaperConnection mConnection;
final IBinder mWindowToken;
int mReqWidth;
int mReqHeight;
Engine mEngine;
IWallpaperEngineWrapper(WallpaperService context,
IWallpaperConnection conn, IBinder windowToken,
int reqWidth, int reqHeight) {
mCaller = new HandlerCaller(context, this);
mConnection = conn;
mWindowToken = windowToken;
mReqWidth = reqWidth;
mReqHeight = reqHeight;
try {
conn.attachEngine(this);
} catch (RemoteException e) {
destroy();
}
Message msg = mCaller.obtainMessage(DO_ATTACH);
mCaller.sendMessage(msg);
}
public void destroy() {
Message msg = mCaller.obtainMessage(DO_DETACH);
mCaller.sendMessage(msg);
}
public void executeMessage(Message message) {
switch (message.what) {
case DO_ATTACH: {
Engine engine = onCreateEngine();
mEngine = engine;
engine.attach(this);
return;
}
case DO_DETACH: {
mEngine.detach();
return;
}
case MSG_UPDATE_SURFACE:
mEngine.updateSurface(false);
break;
default :
Log.w(TAG, "Unknown message type " + message.what);
}
}
}
/**
* Implements the internal {@link IWallpaperService} interface to convert
* incoming calls to it back to calls on an {@link WallpaperService}.
*/
class IWallpaperServiceWrapper extends IWallpaperService.Stub {
private final WallpaperService mTarget;
public IWallpaperServiceWrapper(WallpaperService context) {
mTarget = context;
}
public void attach(IWallpaperConnection conn,
IBinder windowToken, int reqWidth, int reqHeight) {
new IWallpaperEngineWrapper(
mTarget, conn, windowToken, reqWidth, reqHeight);
}
}
/**
* Implement to return the implementation of the internal accessibility
* service interface. Subclasses should not override.
*/
@Override
public final IBinder onBind(Intent intent) {
return new IWallpaperServiceWrapper(this);
}
public abstract Engine onCreateEngine();
}
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