8cc6a5026a
This is mostly refactoring, adding a new WallpaperManager class that takes care of the old wallpaper APIs on Context, so we don't need to pollute Context with various new wallpaper APIs as they are needed. Also adds the first little definition of a wallpaper service, which is not yet used or useful.
387 lines
13 KiB
Java
387 lines
13 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.Context;
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import android.content.Intent;
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import android.content.pm.PackageManager;
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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.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.util.Config;
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import android.util.Log;
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import android.util.Xml;
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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 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.util.FastXmlSerializer;
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class WallpaperManagerService extends IWallpaperManager.Stub {
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private static final String TAG = "WallpaperService";
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private 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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private final Context mContext;
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private int mWidth = -1;
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private int mHeight = -1;
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private String mName = "";
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public WallpaperManagerService(Context context) {
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if (Config.LOGD) Log.d(TAG, "WallpaperService startup");
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mContext = context;
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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 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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}
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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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if (Config.LOGD) Log.d(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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if (name == null) name = "";
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mName = name;
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saveSettingsLocked();
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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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return fd;
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} catch (FileNotFoundException e) {
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if (Config.LOGD) Log.d(TAG, "Error setting wallpaper", e);
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}
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return 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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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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int providerIndex = 0;
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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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}
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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
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+ " ident=" + ident);
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return false;
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}
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res = r.openRawResource(resId);
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fos = new FileOutputStream(WALLPAPER_FILE);
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byte[] buffer = new byte[32768];
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int amt;
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while ((amt=res.read(buffer)) > 0) {
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fos.write(buffer, 0, amt);
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}
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// mWallpaperObserver will notice the close and send the change broadcast
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Log.d(TAG, "Restored wallpaper: " + resName);
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return true;
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} catch (NameNotFoundException e) {
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Log.e(TAG, "Package name " + pkg + " not found");
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} catch (Resources.NotFoundException e) {
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Log.e(TAG, "Resource not found: " + resId);
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} catch (IOException e) {
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Log.e(TAG, "IOException while restoring wallpaper ", e);
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} finally {
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if (res != null) {
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try {
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res.close();
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} catch (IOException ex) {}
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}
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if (fos != null) {
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try {
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fos.close();
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} catch (IOException ex) {}
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}
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}
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}
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}
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return false;
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}
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}
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