585 lines
21 KiB
Java
585 lines
21 KiB
Java
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server;
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import static android.os.FileObserver.*;
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import static android.os.ParcelFileDescriptor.*;
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import android.app.IWallpaperManager;
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import android.app.IWallpaperManagerCallback;
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import android.backup.BackupManager;
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import android.content.ComponentName;
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import android.content.Context;
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import android.content.Intent;
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import android.content.ServiceConnection;
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import android.content.pm.PackageManager;
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import android.content.pm.ResolveInfo;
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import android.content.pm.ServiceInfo;
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import android.content.pm.PackageManager.NameNotFoundException;
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import android.content.res.Resources;
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import android.os.Binder;
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import android.os.IBinder;
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import android.os.RemoteException;
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import android.os.FileObserver;
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import android.os.ParcelFileDescriptor;
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import android.os.RemoteCallbackList;
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import android.os.ServiceManager;
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import android.service.wallpaper.IWallpaperConnection;
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import android.service.wallpaper.IWallpaperEngine;
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import android.service.wallpaper.IWallpaperService;
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import android.service.wallpaper.WallpaperService;
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import android.util.Log;
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import android.util.Xml;
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import android.view.IWindowManager;
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import android.view.WindowManager;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.util.List;
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import org.xmlpull.v1.XmlPullParser;
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import org.xmlpull.v1.XmlPullParserException;
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import org.xmlpull.v1.XmlSerializer;
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import com.android.internal.service.wallpaper.ImageWallpaper;
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import com.android.internal.util.FastXmlSerializer;
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class WallpaperManagerService extends IWallpaperManager.Stub {
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static final String TAG = "WallpaperService";
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static final boolean DEBUG = true;
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Object mLock = new Object();
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private static final File WALLPAPER_DIR = new File(
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"/data/data/com.android.settings/files");
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private static final String WALLPAPER = "wallpaper";
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private static final File WALLPAPER_FILE = new File(WALLPAPER_DIR, WALLPAPER);
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/**
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* List of callbacks registered they should each be notified
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* when the wallpaper is changed.
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*/
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private final RemoteCallbackList<IWallpaperManagerCallback> mCallbacks
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= new RemoteCallbackList<IWallpaperManagerCallback>();
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/**
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* Observes the wallpaper for changes and notifies all IWallpaperServiceCallbacks
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* that the wallpaper has changed. The CREATE is triggered when there is no
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* wallpaper set and is created for the first time. The CLOSE_WRITE is triggered
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* everytime the wallpaper is changed.
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*/
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private final FileObserver mWallpaperObserver = new FileObserver(
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WALLPAPER_DIR.getAbsolutePath(), CREATE | CLOSE_WRITE | DELETE | DELETE_SELF) {
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@Override
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public void onEvent(int event, String path) {
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if (path == null) {
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return;
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}
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synchronized (mLock) {
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// changing the wallpaper means we'll need to back up the new one
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long origId = Binder.clearCallingIdentity();
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BackupManager bm = new BackupManager(mContext);
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bm.dataChanged();
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Binder.restoreCallingIdentity(origId);
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File changedFile = new File(WALLPAPER_DIR, path);
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if (WALLPAPER_FILE.equals(changedFile)) {
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notifyCallbacksLocked();
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}
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}
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}
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};
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final Context mContext;
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final IWindowManager mIWindowManager;
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int mWidth = -1;
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int mHeight = -1;
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String mName = "";
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ComponentName mWallpaperComponent;
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WallpaperConnection mWallpaperConnection;
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class WallpaperConnection extends IWallpaperConnection.Stub
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implements ServiceConnection {
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final Binder mToken = new Binder();
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IWallpaperService mService;
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IWallpaperEngine mEngine;
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public void onServiceConnected(ComponentName name, IBinder service) {
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synchronized (mLock) {
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if (mWallpaperConnection == this) {
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mService = IWallpaperService.Stub.asInterface(service);
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attachServiceLocked(this);
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}
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}
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}
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public void onServiceDisconnected(ComponentName name) {
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synchronized (mLock) {
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mService = null;
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mEngine = null;
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}
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}
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public void attachEngine(IWallpaperEngine engine) {
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mEngine = engine;
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}
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public ParcelFileDescriptor setWallpaper(String name) {
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synchronized (mLock) {
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if (mWallpaperConnection == this) {
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ParcelFileDescriptor pfd = updateWallpaperBitmapLocked(name);
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if (pfd != null) {
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saveSettingsLocked();
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}
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return pfd;
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}
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return null;
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}
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}
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}
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public WallpaperManagerService(Context context) {
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if (DEBUG) Log.d(TAG, "WallpaperService startup");
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mContext = context;
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mIWindowManager = IWindowManager.Stub.asInterface(
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ServiceManager.getService(Context.WINDOW_SERVICE));
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WALLPAPER_DIR.mkdirs();
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loadSettingsLocked();
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mWallpaperObserver.startWatching();
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}
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@Override
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protected void finalize() throws Throwable {
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super.finalize();
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mWallpaperObserver.stopWatching();
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}
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public void systemReady() {
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synchronized (mLock) {
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try {
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bindWallpaperComponentLocked(mWallpaperComponent);
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} catch (RuntimeException e) {
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Log.w(TAG, "Failure starting previous wallpaper", e);
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try {
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bindWallpaperComponentLocked(null);
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} catch (RuntimeException e2) {
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Log.w(TAG, "Failure starting default wallpaper", e2);
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clearWallpaperComponentLocked();
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}
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}
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}
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}
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public void clearWallpaper() {
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synchronized (mLock) {
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File f = WALLPAPER_FILE;
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if (f.exists()) {
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f.delete();
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}
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bindWallpaperComponentLocked(null);
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}
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}
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public void setDimensionHints(int width, int height) throws RemoteException {
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checkPermission(android.Manifest.permission.SET_WALLPAPER_HINTS);
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if (width <= 0 || height <= 0) {
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throw new IllegalArgumentException("width and height must be > 0");
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}
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synchronized (mLock) {
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if (width != mWidth || height != mHeight) {
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mWidth = width;
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mHeight = height;
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saveSettingsLocked();
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}
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}
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}
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public int getWidthHint() throws RemoteException {
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synchronized (mLock) {
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return mWidth;
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}
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}
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public int getHeightHint() throws RemoteException {
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synchronized (mLock) {
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return mHeight;
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}
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}
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public ParcelFileDescriptor getWallpaper(IWallpaperManagerCallback cb) {
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synchronized (mLock) {
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try {
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mCallbacks.register(cb);
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File f = WALLPAPER_FILE;
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if (!f.exists()) {
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return null;
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}
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return ParcelFileDescriptor.open(f, MODE_READ_ONLY);
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} catch (FileNotFoundException e) {
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/* Shouldn't happen as we check to see if the file exists */
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Log.w(TAG, "Error getting wallpaper", e);
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}
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return null;
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}
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}
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public ParcelFileDescriptor setWallpaper(String name) {
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checkPermission(android.Manifest.permission.SET_WALLPAPER);
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synchronized (mLock) {
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ParcelFileDescriptor pfd = updateWallpaperBitmapLocked(name);
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if (pfd != null) {
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bindWallpaperComponentLocked(null);
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saveSettingsLocked();
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}
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return pfd;
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}
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}
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ParcelFileDescriptor updateWallpaperBitmapLocked(String name) {
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if (name == null) name = "";
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try {
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ParcelFileDescriptor fd = ParcelFileDescriptor.open(WALLPAPER_FILE,
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MODE_CREATE|MODE_READ_WRITE);
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mName = name;
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return fd;
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} catch (FileNotFoundException e) {
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Log.w(TAG, "Error setting wallpaper", e);
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}
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return null;
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}
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public void setWallpaperComponent(ComponentName name) {
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checkPermission(android.Manifest.permission.SET_WALLPAPER_COMPONENT);
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synchronized (mLock) {
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final long ident = Binder.clearCallingIdentity();
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try {
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bindWallpaperComponentLocked(name);
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} finally {
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Binder.restoreCallingIdentity(ident);
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}
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}
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}
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void bindWallpaperComponentLocked(ComponentName name) {
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// Has the component changed?
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if (mWallpaperConnection != null) {
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if (mWallpaperComponent == null) {
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if (name == null) {
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// Still using default wallpaper.
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return;
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}
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} else if (mWallpaperComponent.equals(name)) {
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// Changing to same wallpaper.
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return;
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}
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}
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try {
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ComponentName realName = name;
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if (realName == null) {
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// The default component is our static image wallpaper.
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realName = new ComponentName("android",
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ImageWallpaper.class.getName());
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}
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ServiceInfo si = mContext.getPackageManager().getServiceInfo(realName,
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PackageManager.GET_META_DATA | PackageManager.GET_PERMISSIONS);
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if (!android.Manifest.permission.BIND_WALLPAPER.equals(si.permission)) {
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throw new SecurityException("Selected service does not require "
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+ android.Manifest.permission.BIND_WALLPAPER
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+ ": " + realName);
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}
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Intent intent = new Intent(WallpaperService.SERVICE_INTERFACE);
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if (name != null) {
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// Make sure the selected service is actually a wallpaper service.
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List<ResolveInfo> ris = mContext.getPackageManager()
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.queryIntentServices(intent, 0);
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for (int i=0; i<ris.size(); i++) {
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ServiceInfo rsi = ris.get(i).serviceInfo;
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if (rsi.name.equals(si.name) &&
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rsi.packageName.equals(si.packageName)) {
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ris = null;
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break;
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}
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}
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if (ris != null) {
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throw new SecurityException("Selected service is not a wallpaper: "
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+ realName);
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}
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}
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// Bind the service!
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WallpaperConnection newConn = new WallpaperConnection();
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intent.setComponent(realName);
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if (!mContext.bindService(intent, newConn,
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Context.BIND_AUTO_CREATE)) {
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throw new IllegalArgumentException("Unable to bind service: "
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+ name);
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}
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clearWallpaperComponentLocked();
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mWallpaperComponent = name;
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mWallpaperConnection = newConn;
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try {
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if (DEBUG) Log.v(TAG, "Adding window token: " + newConn.mToken);
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mIWindowManager.addWindowToken(newConn.mToken,
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WindowManager.LayoutParams.TYPE_WALLPAPER);
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} catch (RemoteException e) {
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}
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} catch (PackageManager.NameNotFoundException e) {
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throw new IllegalArgumentException("Unknown component " + name);
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}
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}
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void clearWallpaperComponentLocked() {
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mWallpaperComponent = null;
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if (mWallpaperConnection != null) {
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if (mWallpaperConnection.mEngine != null) {
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try {
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mWallpaperConnection.mEngine.destroy();
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} catch (RemoteException e) {
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}
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}
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mContext.unbindService(mWallpaperConnection);
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mWallpaperConnection = null;
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}
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}
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void attachServiceLocked(WallpaperConnection conn) {
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try {
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conn.mService.attach(conn, conn.mToken, mWidth, mHeight);
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} catch (RemoteException e) {
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Log.w(TAG, "Failed attaching wallpaper; clearing", e);
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bindWallpaperComponentLocked(null);
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}
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}
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private void notifyCallbacksLocked() {
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final int n = mCallbacks.beginBroadcast();
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for (int i = 0; i < n; i++) {
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try {
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mCallbacks.getBroadcastItem(i).onWallpaperChanged();
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} catch (RemoteException e) {
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// The RemoteCallbackList will take care of removing
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// the dead object for us.
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}
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}
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mCallbacks.finishBroadcast();
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final Intent intent = new Intent(Intent.ACTION_WALLPAPER_CHANGED);
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mContext.sendBroadcast(intent);
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}
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private void checkPermission(String permission) {
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if (PackageManager.PERMISSION_GRANTED!= mContext.checkCallingOrSelfPermission(permission)) {
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throw new SecurityException("Access denied to process: " + Binder.getCallingPid()
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+ ", must have permission " + permission);
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}
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}
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private static JournaledFile makeJournaledFile() {
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final String base = "/data/system/wallpaper_info.xml";
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return new JournaledFile(new File(base), new File(base + ".tmp"));
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}
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private void saveSettingsLocked() {
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JournaledFile journal = makeJournaledFile();
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FileOutputStream stream = null;
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try {
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stream = new FileOutputStream(journal.chooseForWrite(), false);
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XmlSerializer out = new FastXmlSerializer();
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out.setOutput(stream, "utf-8");
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out.startDocument(null, true);
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out.startTag(null, "wp");
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out.attribute(null, "width", Integer.toString(mWidth));
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out.attribute(null, "height", Integer.toString(mHeight));
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out.attribute(null, "name", mName);
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if (mWallpaperComponent != null) {
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out.attribute(null, "component",
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mWallpaperComponent.flattenToShortString());
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}
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out.endTag(null, "wp");
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out.endDocument();
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stream.close();
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journal.commit();
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} catch (IOException e) {
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try {
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if (stream != null) {
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stream.close();
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}
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} catch (IOException ex) {
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// Ignore
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}
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journal.rollback();
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}
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}
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private void loadSettingsLocked() {
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JournaledFile journal = makeJournaledFile();
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FileInputStream stream = null;
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File file = journal.chooseForRead();
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boolean success = false;
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try {
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stream = new FileInputStream(file);
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XmlPullParser parser = Xml.newPullParser();
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parser.setInput(stream, null);
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int type;
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do {
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type = parser.next();
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if (type == XmlPullParser.START_TAG) {
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String tag = parser.getName();
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if ("wp".equals(tag)) {
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mWidth = Integer.parseInt(parser.getAttributeValue(null, "width"));
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mHeight = Integer.parseInt(parser.getAttributeValue(null, "height"));
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mName = parser.getAttributeValue(null, "name");
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String comp = parser.getAttributeValue(null, "component");
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mWallpaperComponent = comp != null
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? ComponentName.unflattenFromString(comp)
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: null;
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}
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}
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} while (type != XmlPullParser.END_DOCUMENT);
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success = true;
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} catch (NullPointerException e) {
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Log.w(TAG, "failed parsing " + file + " " + e);
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} catch (NumberFormatException e) {
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Log.w(TAG, "failed parsing " + file + " " + e);
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} catch (XmlPullParserException e) {
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Log.w(TAG, "failed parsing " + file + " " + e);
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} catch (IOException e) {
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Log.w(TAG, "failed parsing " + file + " " + e);
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} catch (IndexOutOfBoundsException e) {
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Log.w(TAG, "failed parsing " + file + " " + e);
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}
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try {
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if (stream != null) {
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stream.close();
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}
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} catch (IOException e) {
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// Ignore
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}
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if (!success) {
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mWidth = -1;
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mHeight = -1;
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mName = "";
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}
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}
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void settingsRestored() {
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boolean success = false;
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synchronized (mLock) {
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loadSettingsLocked();
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// If there's a wallpaper name, we use that. If that can't be loaded, then we
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// use the default.
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if ("".equals(mName)) {
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success = true;
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} else {
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success = restoreNamedResourceLocked();
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}
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}
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if (!success) {
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Log.e(TAG, "Failed to restore wallpaper: '" + mName + "'");
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mName = "";
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WALLPAPER_FILE.delete();
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}
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saveSettingsLocked();
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}
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boolean restoreNamedResourceLocked() {
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if (mName.length() > 4 && "res:".equals(mName.substring(0, 4))) {
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String resName = mName.substring(4);
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String pkg = null;
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int colon = resName.indexOf(':');
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if (colon > 0) {
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pkg = resName.substring(0, colon);
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}
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String ident = null;
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int slash = resName.lastIndexOf('/');
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if (slash > 0) {
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ident = resName.substring(slash+1);
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}
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String type = null;
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if (colon > 0 && slash > 0 && (slash-colon) > 1) {
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type = resName.substring(colon+1, slash);
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}
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if (pkg != null && ident != null && type != null) {
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int resId = -1;
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InputStream res = null;
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FileOutputStream fos = null;
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try {
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Context c = mContext.createPackageContext(pkg, Context.CONTEXT_RESTRICTED);
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Resources r = c.getResources();
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resId = r.getIdentifier(resName, null, null);
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if (resId == 0) {
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Log.e(TAG, "couldn't resolve identifier pkg=" + pkg + " type=" + type
|
|
+ " ident=" + ident);
|
|
return false;
|
|
}
|
|
|
|
res = r.openRawResource(resId);
|
|
fos = new FileOutputStream(WALLPAPER_FILE);
|
|
|
|
byte[] buffer = new byte[32768];
|
|
int amt;
|
|
while ((amt=res.read(buffer)) > 0) {
|
|
fos.write(buffer, 0, amt);
|
|
}
|
|
// mWallpaperObserver will notice the close and send the change broadcast
|
|
|
|
Log.d(TAG, "Restored wallpaper: " + resName);
|
|
return true;
|
|
} catch (NameNotFoundException e) {
|
|
Log.e(TAG, "Package name " + pkg + " not found");
|
|
} catch (Resources.NotFoundException e) {
|
|
Log.e(TAG, "Resource not found: " + resId);
|
|
} catch (IOException e) {
|
|
Log.e(TAG, "IOException while restoring wallpaper ", e);
|
|
} finally {
|
|
if (res != null) {
|
|
try {
|
|
res.close();
|
|
} catch (IOException ex) {}
|
|
}
|
|
if (fos != null) {
|
|
try {
|
|
fos.close();
|
|
} catch (IOException ex) {}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
}
|