diff options
Diffstat (limited to 'services/java/com/android/server/AppWidgetService.java')
| -rw-r--r-- | services/java/com/android/server/AppWidgetService.java | 1148 |
1 files changed, 1148 insertions, 0 deletions
diff --git a/services/java/com/android/server/AppWidgetService.java b/services/java/com/android/server/AppWidgetService.java new file mode 100644 index 0000000..de5d0ac --- /dev/null +++ b/services/java/com/android/server/AppWidgetService.java @@ -0,0 +1,1148 @@ +/* + * Copyright (C) 2007 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 com.android.server; + +import android.app.AlarmManager; +import android.app.PendingIntent; +import android.appwidget.AppWidgetManager; +import android.appwidget.AppWidgetProviderInfo; +import android.content.BroadcastReceiver; +import android.content.ComponentName; +import android.content.Context; +import android.content.Intent; +import android.content.IntentFilter; +import android.content.pm.ActivityInfo; +import android.content.pm.PackageManager; +import android.content.pm.PackageInfo; +import android.content.pm.ResolveInfo; +import android.content.pm.PackageItemInfo; +import android.content.res.TypedArray; +import android.content.res.XmlResourceParser; +import android.net.Uri; +import android.os.Binder; +import android.os.Bundle; +import android.os.RemoteException; +import android.os.SystemClock; +import android.util.AttributeSet; +import android.util.Log; +import android.util.Xml; +import android.widget.RemoteViews; + +import java.io.IOException; +import java.io.File; +import java.io.FileDescriptor; +import java.io.FileInputStream; +import java.io.FileOutputStream; +import java.io.PrintWriter; +import java.util.ArrayList; +import java.util.List; +import java.util.HashMap; +import java.util.HashSet; + +import com.android.internal.appwidget.IAppWidgetService; +import com.android.internal.appwidget.IAppWidgetHost; +import com.android.internal.util.XmlUtils; +import com.android.internal.util.FastXmlSerializer; + +import org.xmlpull.v1.XmlPullParser; +import org.xmlpull.v1.XmlPullParserException; +import org.xmlpull.v1.XmlSerializer; + +class AppWidgetService extends IAppWidgetService.Stub +{ + private static final String TAG = "AppWidgetService"; + + private static final String SETTINGS_FILENAME = "appwidgets.xml"; + private static final String SETTINGS_TMP_FILENAME = SETTINGS_FILENAME + ".tmp"; + + /* + * When identifying a Host or Provider based on the calling process, use the uid field. + * When identifying a Host or Provider based on a package manager broadcast, use the + * package given. + */ + + static class Provider { + int uid; + AppWidgetProviderInfo info; + ArrayList<AppWidgetId> instances = new ArrayList(); + PendingIntent broadcast; + boolean zombie; // if we're in safe mode, don't prune this just because nobody references it + + int tag; // for use while saving state (the index) + } + + static class Host { + int uid; + int hostId; + String packageName; + ArrayList<AppWidgetId> instances = new ArrayList(); + IAppWidgetHost callbacks; + boolean zombie; // if we're in safe mode, don't prune this just because nobody references it + + int tag; // for use while saving state (the index) + } + + static class AppWidgetId { + int appWidgetId; + Provider provider; + RemoteViews views; + Host host; + } + + Context mContext; + PackageManager mPackageManager; + AlarmManager mAlarmManager; + ArrayList<Provider> mInstalledProviders = new ArrayList(); + int mNextAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID + 1; + ArrayList<AppWidgetId> mAppWidgetIds = new ArrayList(); + ArrayList<Host> mHosts = new ArrayList(); + boolean mSafeMode; + + AppWidgetService(Context context) { + mContext = context; + mPackageManager = context.getPackageManager(); + mAlarmManager = (AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE); + } + + public void systemReady(boolean safeMode) { + mSafeMode = safeMode; + + loadAppWidgetList(); + loadStateLocked(); + + // Register for the boot completed broadcast, so we can send the + // ENABLE broacasts. If we try to send them now, they time out, + // because the system isn't ready to handle them yet. + mContext.registerReceiver(mBroadcastReceiver, + new IntentFilter(Intent.ACTION_BOOT_COMPLETED), null, null); + + // Register for broadcasts about package install, etc., so we can + // update the provider list. + IntentFilter filter = new IntentFilter(); + filter.addAction(Intent.ACTION_PACKAGE_ADDED); + filter.addAction(Intent.ACTION_PACKAGE_REMOVED); + filter.addDataScheme("package"); + mContext.registerReceiver(mBroadcastReceiver, filter); + } + + @Override + public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { + if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) + != PackageManager.PERMISSION_GRANTED) { + pw.println("Permission Denial: can't dump from from pid=" + + Binder.getCallingPid() + + ", uid=" + Binder.getCallingUid()); + return; + } + + synchronized (mAppWidgetIds) { + int N = mInstalledProviders.size(); + pw.println("Providers: (size=" + N + ")"); + for (int i=0; i<N; i++) { + Provider p = mInstalledProviders.get(i); + AppWidgetProviderInfo info = p.info; + pw.println(" [" + i + "] provder=" + info.provider + + " min=(" + info.minWidth + "x" + info.minHeight + ")" + + " updatePeriodMillis=" + info.updatePeriodMillis + + " initialLayout=" + info.initialLayout + " zombie=" + p.zombie); + } + + N = mAppWidgetIds.size(); + pw.println("AppWidgetIds: (size=" + N + ")"); + for (int i=0; i<N; i++) { + AppWidgetId id = mAppWidgetIds.get(i); + pw.println(" [" + i + "] appWidgetId=" + id.appWidgetId + + " host=" + id.host.hostId + "/" + id.host.packageName + " provider=" + + (id.provider == null ? "null" : id.provider.info.provider) + + " host.callbacks=" + (id.host != null ? id.host.callbacks : "(no host)") + + " views=" + id.views); + } + + N = mHosts.size(); + pw.println("Hosts: (size=" + N + ")"); + for (int i=0; i<N; i++) { + Host host = mHosts.get(i); + pw.println(" [" + i + "] packageName=" + host.packageName + " uid=" + host.uid + + " hostId=" + host.hostId + " callbacks=" + host.callbacks + + " instances.size=" + host.instances.size() + " zombie=" + host.zombie); + } + } + } + + public int allocateAppWidgetId(String packageName, int hostId) { + int callingUid = enforceCallingUid(packageName); + synchronized (mAppWidgetIds) { + int appWidgetId = mNextAppWidgetId++; + + Host host = lookupOrAddHostLocked(callingUid, packageName, hostId); + + AppWidgetId id = new AppWidgetId(); + id.appWidgetId = appWidgetId; + id.host = host; + + host.instances.add(id); + mAppWidgetIds.add(id); + + saveStateLocked(); + + return appWidgetId; + } + } + + public void deleteAppWidgetId(int appWidgetId) { + synchronized (mAppWidgetIds) { + AppWidgetId id = lookupAppWidgetIdLocked(appWidgetId); + if (id != null) { + deleteAppWidgetLocked(id); + saveStateLocked(); + } + } + } + + public void deleteHost(int hostId) { + synchronized (mAppWidgetIds) { + int callingUid = getCallingUid(); + Host host = lookupHostLocked(callingUid, hostId); + if (host != null) { + deleteHostLocked(host); + saveStateLocked(); + } + } + } + + public void deleteAllHosts() { + synchronized (mAppWidgetIds) { + int callingUid = getCallingUid(); + final int N = mHosts.size(); + boolean changed = false; + for (int i=N-1; i>=0; i--) { + Host host = mHosts.get(i); + if (host.uid == callingUid) { + deleteHostLocked(host); + changed = true; + } + } + if (changed) { + saveStateLocked(); + } + } + } + + void deleteHostLocked(Host host) { + final int N = host.instances.size(); + for (int i=N-1; i>=0; i--) { + AppWidgetId id = host.instances.get(i); + deleteAppWidgetLocked(id); + } + host.instances.clear(); + mHosts.remove(host); + // it's gone or going away, abruptly drop the callback connection + host.callbacks = null; + } + + void deleteAppWidgetLocked(AppWidgetId id) { + Host host = id.host; + host.instances.remove(id); + pruneHostLocked(host); + + mAppWidgetIds.remove(id); + + Provider p = id.provider; + if (p != null) { + p.instances.remove(id); + if (!p.zombie) { + // send the broacast saying that this appWidgetId has been deleted + Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_DELETED); + intent.setComponent(p.info.provider); + intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, id.appWidgetId); + mContext.sendBroadcast(intent); + if (p.instances.size() == 0) { + // cancel the future updates + cancelBroadcasts(p); + + // send the broacast saying that the provider is not in use any more + intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_DISABLED); + intent.setComponent(p.info.provider); + mContext.sendBroadcast(intent); + } + } + } + } + + void cancelBroadcasts(Provider p) { + if (p.broadcast != null) { + mAlarmManager.cancel(p.broadcast); + long token = Binder.clearCallingIdentity(); + try { + p.broadcast.cancel(); + } finally { + Binder.restoreCallingIdentity(token); + } + p.broadcast = null; + } + } + + public void bindAppWidgetId(int appWidgetId, ComponentName provider) { + mContext.enforceCallingPermission(android.Manifest.permission.BIND_APPWIDGET, + "bindGagetId appWidgetId=" + appWidgetId + " provider=" + provider); + synchronized (mAppWidgetIds) { + AppWidgetId id = lookupAppWidgetIdLocked(appWidgetId); + if (id == null) { + throw new IllegalArgumentException("bad appWidgetId"); + } + if (id.provider != null) { + throw new IllegalArgumentException("appWidgetId " + appWidgetId + " already bound to " + + id.provider.info.provider); + } + Provider p = lookupProviderLocked(provider); + if (p == null) { + throw new IllegalArgumentException("not a appwidget provider: " + provider); + } + if (p.zombie) { + throw new IllegalArgumentException("can't bind to a 3rd party provider in" + + " safe mode: " + provider); + } + + id.provider = p; + p.instances.add(id); + int instancesSize = p.instances.size(); + if (instancesSize == 1) { + // tell the provider that it's ready + sendEnableIntentLocked(p); + } + + // send an update now -- We need this update now, and just for this appWidgetId. + // It's less critical when the next one happens, so when we schdule the next one, + // we add updatePeriodMillis to its start time. That time will have some slop, + // but that's okay. + sendUpdateIntentLocked(p, new int[] { appWidgetId }); + + // schedule the future updates + registerForBroadcastsLocked(p, getAppWidgetIds(p)); + saveStateLocked(); + } + } + + public AppWidgetProviderInfo getAppWidgetInfo(int appWidgetId) { + synchronized (mAppWidgetIds) { + AppWidgetId id = lookupAppWidgetIdLocked(appWidgetId); + if (id != null && id.provider != null && !id.provider.zombie) { + return id.provider.info; + } + return null; + } + } + + public RemoteViews getAppWidgetViews(int appWidgetId) { + synchronized (mAppWidgetIds) { + AppWidgetId id = lookupAppWidgetIdLocked(appWidgetId); + if (id != null) { + return id.views; + } + return null; + } + } + + public List<AppWidgetProviderInfo> getInstalledProviders() { + synchronized (mAppWidgetIds) { + final int N = mInstalledProviders.size(); + ArrayList<AppWidgetProviderInfo> result = new ArrayList(N); + for (int i=0; i<N; i++) { + Provider p = mInstalledProviders.get(i); + if (!p.zombie) { + result.add(p.info); + } + } + return result; + } + } + + public void updateAppWidgetIds(int[] appWidgetIds, RemoteViews views) { + if (appWidgetIds == null) { + return; + } + if (appWidgetIds.length == 0) { + return; + } + final int N = appWidgetIds.length; + + synchronized (mAppWidgetIds) { + for (int i=0; i<N; i++) { + AppWidgetId id = lookupAppWidgetIdLocked(appWidgetIds[i]); + updateAppWidgetInstanceLocked(id, views); + } + } + } + + public void updateAppWidgetProvider(ComponentName provider, RemoteViews views) { + synchronized (mAppWidgetIds) { + Provider p = lookupProviderLocked(provider); + if (p == null) { + Log.w(TAG, "updateAppWidgetProvider: provider doesn't exist: " + provider); + return; + } + ArrayList<AppWidgetId> instances = p.instances; + final int N = instances.size(); + for (int i=0; i<N; i++) { + AppWidgetId id = instances.get(i); + updateAppWidgetInstanceLocked(id, views); + } + } + } + + void updateAppWidgetInstanceLocked(AppWidgetId id, RemoteViews views) { + // allow for stale appWidgetIds and other badness + // lookup also checks that the calling process can access the appWidgetId + // drop unbound appWidgetIds (shouldn't be possible under normal circumstances) + if (id != null && id.provider != null && !id.provider.zombie && !id.host.zombie) { + id.views = views; + + // is anyone listening? + if (id.host.callbacks != null) { + try { + // the lock is held, but this is a oneway call + id.host.callbacks.updateAppWidget(id.appWidgetId, views); + } catch (RemoteException e) { + // It failed; remove the callback. No need to prune because + // we know that this host is still referenced by this instance. + id.host.callbacks = null; + } + } + } + } + + public int[] startListening(IAppWidgetHost callbacks, String packageName, int hostId, + List<RemoteViews> updatedViews) { + int callingUid = enforceCallingUid(packageName); + synchronized (mAppWidgetIds) { + Host host = lookupOrAddHostLocked(callingUid, packageName, hostId); + host.callbacks = callbacks; + + updatedViews.clear(); + + ArrayList<AppWidgetId> instances = host.instances; + int N = instances.size(); + int[] updatedIds = new int[N]; + for (int i=0; i<N; i++) { + AppWidgetId id = instances.get(i); + updatedIds[i] = id.appWidgetId; + updatedViews.add(id.views); + } + return updatedIds; + } + } + + public void stopListening(int hostId) { + synchronized (mAppWidgetIds) { + Host host = lookupHostLocked(getCallingUid(), hostId); + host.callbacks = null; + pruneHostLocked(host); + } + } + + boolean canAccessAppWidgetId(AppWidgetId id, int callingUid) { + if (id.host.uid == callingUid) { + // Apps hosting the AppWidget have access to it. + return true; + } + if (id.provider != null && id.provider.uid == callingUid) { + // Apps providing the AppWidget have access to it (if the appWidgetId has been bound) + return true; + } + if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.BIND_APPWIDGET) + == PackageManager.PERMISSION_GRANTED) { + // Apps that can bind have access to all appWidgetIds. + return true; + } + // Nobody else can access it. + return false; + } + + AppWidgetId lookupAppWidgetIdLocked(int appWidgetId) { + int callingUid = getCallingUid(); + final int N = mAppWidgetIds.size(); + for (int i=0; i<N; i++) { + AppWidgetId id = mAppWidgetIds.get(i); + if (id.appWidgetId == appWidgetId && canAccessAppWidgetId(id, callingUid)) { + return id; + } + } + return null; + } + + Provider lookupProviderLocked(ComponentName provider) { + final int N = mInstalledProviders.size(); + for (int i=0; i<N; i++) { + Provider p = mInstalledProviders.get(i); + if (p.info.provider.equals(provider)) { + return p; + } + } + return null; + } + + Host lookupHostLocked(int uid, int hostId) { + final int N = mHosts.size(); + for (int i=0; i<N; i++) { + Host h = mHosts.get(i); + if (h.uid == uid && h.hostId == hostId) { + return h; + } + } + return null; + } + + Host lookupOrAddHostLocked(int uid, String packageName, int hostId) { + final int N = mHosts.size(); + for (int i=0; i<N; i++) { + Host h = mHosts.get(i); + if (h.hostId == hostId && h.packageName.equals(packageName)) { + return h; + } + } + Host host = new Host(); + host.packageName = packageName; + host.uid = uid; + host.hostId = hostId; + mHosts.add(host); + return host; + } + + void pruneHostLocked(Host host) { + if (host.instances.size() == 0 && host.callbacks == null) { + mHosts.remove(host); + } + } + + void loadAppWidgetList() { + PackageManager pm = mPackageManager; + + Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE); + List<ResolveInfo> broadcastReceivers = pm.queryBroadcastReceivers(intent, + PackageManager.GET_META_DATA); + + final int N = broadcastReceivers.size(); + for (int i=0; i<N; i++) { + ResolveInfo ri = broadcastReceivers.get(i); + addProviderLocked(ri); + } + } + + boolean addProviderLocked(ResolveInfo ri) { + Provider p = parseProviderInfoXml(new ComponentName(ri.activityInfo.packageName, + ri.activityInfo.name), ri); + if (p != null) { + mInstalledProviders.add(p); + return true; + } else { + return false; + } + } + + void removeProviderLocked(int index, Provider p) { + int N = p.instances.size(); + for (int i=0; i<N; i++) { + AppWidgetId id = p.instances.get(i); + // Call back with empty RemoteViews + updateAppWidgetInstanceLocked(id, null); + // Stop telling the host about updates for this from now on + cancelBroadcasts(p); + // clear out references to this appWidgetId + id.host.instances.remove(id); + mAppWidgetIds.remove(id); + id.provider = null; + pruneHostLocked(id.host); + id.host = null; + } + p.instances.clear(); + mInstalledProviders.remove(index); + // no need to send the DISABLE broadcast, since the receiver is gone anyway + cancelBroadcasts(p); + } + + void sendEnableIntentLocked(Provider p) { + Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_ENABLED); + intent.setComponent(p.info.provider); + mContext.sendBroadcast(intent); + } + + void sendUpdateIntentLocked(Provider p, int[] appWidgetIds) { + if (appWidgetIds != null && appWidgetIds.length > 0) { + Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE); + intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds); + intent.setComponent(p.info.provider); + mContext.sendBroadcast(intent); + } + } + + void registerForBroadcastsLocked(Provider p, int[] appWidgetIds) { + if (p.info.updatePeriodMillis > 0) { + // if this is the first instance, set the alarm. otherwise, + // rely on the fact that we've already set it and that + // PendingIntent.getBroadcast will update the extras. + boolean alreadyRegistered = p.broadcast != null; + int instancesSize = p.instances.size(); + Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE); + intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds); + intent.setComponent(p.info.provider); + long token = Binder.clearCallingIdentity(); + try { + p.broadcast = PendingIntent.getBroadcast(mContext, 1, intent, + PendingIntent.FLAG_UPDATE_CURRENT); + } finally { + Binder.restoreCallingIdentity(token); + } + if (!alreadyRegistered) { + mAlarmManager.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, + SystemClock.elapsedRealtime() + p.info.updatePeriodMillis, + p.info.updatePeriodMillis, p.broadcast); + } + } + } + + static int[] getAppWidgetIds(Provider p) { + int instancesSize = p.instances.size(); + int appWidgetIds[] = new int[instancesSize]; + for (int i=0; i<instancesSize; i++) { + appWidgetIds[i] = p.instances.get(i).appWidgetId; + } + return appWidgetIds; + } + + public int[] getAppWidgetIds(ComponentName provider) { + synchronized (mAppWidgetIds) { + Provider p = lookupProviderLocked(provider); + if (p != null && getCallingUid() == p.uid) { + return getAppWidgetIds(p); + } else { + return new int[0]; + } + } + } + + private Provider parseProviderInfoXml(ComponentName component, ResolveInfo ri) { + Provider p = null; + + ActivityInfo activityInfo = ri.activityInfo; + XmlResourceParser parser = null; + try { + parser = activityInfo.loadXmlMetaData(mPackageManager, + AppWidgetManager.META_DATA_APPWIDGET_PROVIDER); + if (parser == null) { + Log.w(TAG, "No " + AppWidgetManager.META_DATA_APPWIDGET_PROVIDER + " meta-data for " + + "AppWidget provider '" + component + '\''); + return null; + } + + AttributeSet attrs = Xml.asAttributeSet(parser); + + int type; + while ((type=parser.next()) != XmlPullParser.END_DOCUMENT + && type != XmlPullParser.START_TAG) { + // drain whitespace, comments, etc. + } + + String nodeName = parser.getName(); + if (!"appwidget-provider".equals(nodeName)) { + Log.w(TAG, "Meta-data does not start with appwidget-provider tag for" + + " AppWidget provider '" + component + '\''); + return null; + } + + p = new Provider(); + AppWidgetProviderInfo info = p.info = new AppWidgetProviderInfo(); + + info.provider = component; + p.uid = activityInfo.applicationInfo.uid; + + TypedArray sa = mContext.getResources().obtainAttributes(attrs, + com.android.internal.R.styleable.AppWidgetProviderInfo); + info.minWidth = sa.getDimensionPixelSize( + com.android.internal.R.styleable.AppWidgetProviderInfo_minWidth, 0); + info.minHeight = sa.getDimensionPixelSize( + com.android.internal.R.styleable.AppWidgetProviderInfo_minHeight, 0); + info.updatePeriodMillis = sa.getInt( + com.android.internal.R.styleable.AppWidgetProviderInfo_updatePeriodMillis, 0); + info.initialLayout = sa.getResourceId( + com.android.internal.R.styleable.AppWidgetProviderInfo_initialLayout, 0); + String className = sa.getString( + com.android.internal.R.styleable.AppWidgetProviderInfo_configure); + if (className != null) { + info.configure = new ComponentName(component.getPackageName(), className); + } + info.label = activityInfo.loadLabel(mPackageManager).toString(); + info.icon = ri.getIconResource(); + sa.recycle(); + } catch (Exception e) { + // Ok to catch Exception here, because anything going wrong because + // of what a client process passes to us should not be fatal for the + // system process. + Log.w(TAG, "XML parsing failed for AppWidget provider '" + component + '\'', e); + return null; + } finally { + if (parser != null) parser.close(); + } + return p; + } + + int getUidForPackage(String packageName) throws PackageManager.NameNotFoundException { + PackageInfo pkgInfo = mPackageManager.getPackageInfo(packageName, 0); + if (pkgInfo == null || pkgInfo.applicationInfo == null) { + throw new PackageManager.NameNotFoundException(); + } + return pkgInfo.applicationInfo.uid; + } + + int enforceCallingUid(String packageName) throws IllegalArgumentException { + int callingUid = getCallingUid(); + int packageUid; + try { + packageUid = getUidForPackage(packageName); + } catch (PackageManager.NameNotFoundException ex) { + throw new IllegalArgumentException("packageName and uid don't match packageName=" + + packageName); + } + if (callingUid != packageUid) { + throw new IllegalArgumentException("packageName and uid don't match packageName=" + + packageName); + } + return callingUid; + } + + void sendInitialBroadcasts() { + synchronized (mAppWidgetIds) { + final int N = mInstalledProviders.size(); + for (int i=0; i<N; i++) { + Provider p = mInstalledProviders.get(i); + if (p.instances.size() > 0) { + sendEnableIntentLocked(p); + int[] appWidgetIds = getAppWidgetIds(p); + sendUpdateIntentLocked(p, appWidgetIds); + registerForBroadcastsLocked(p, appWidgetIds); + } + } + } + } + + // only call from initialization -- it assumes that the data structures are all empty + void loadStateLocked() { + File temp = savedStateTempFile(); + File real = savedStateRealFile(); + + // prefer the real file. If it doesn't exist, use the temp one, and then copy it to the + // real one. if there is both a real file and a temp one, assume that the temp one isn't + // fully written and delete it. + if (real.exists()) { + readStateFromFileLocked(real); + if (temp.exists()) { + temp.delete(); + } + } else if (temp.exists()) { + readStateFromFileLocked(temp); + temp.renameTo(real); + } + } + + void saveStateLocked() { + File temp = savedStateTempFile(); + File real = savedStateRealFile(); + + if (!real.exists()) { + // If the real one doesn't exist, it's either because this is the first time + // or because something went wrong while copying them. In this case, we can't + // trust anything that's in temp. In order to have the loadState code not + // use the temporary one until it's fully written, create an empty file + // for real, which will we'll shortly delete. + try { + real.createNewFile(); + } catch (IOException e) { + } + } + + if (temp.exists()) { + temp.delete(); + } + + writeStateToFileLocked(temp); + + real.delete(); + temp.renameTo(real); + } + + void writeStateToFileLocked(File file) { + FileOutputStream stream = null; + int N; + + try { + stream = new FileOutputStream(file, false); + XmlSerializer out = new FastXmlSerializer(); + out.setOutput(stream, "utf-8"); + out.startDocument(null, true); + + + out.startTag(null, "gs"); + + int providerIndex = 0; + N = mInstalledProviders.size(); + for (int i=0; i<N; i++) { + Provider p = mInstalledProviders.get(i); + if (p.instances.size() > 0) { + out.startTag(null, "p"); + out.attribute(null, "pkg", p.info.provider.getPackageName()); + out.attribute(null, "cl", p.info.provider.getClassName()); + out.endTag(null, "h"); + p.tag = providerIndex; + providerIndex++; + } + } + + N = mHosts.size(); + for (int i=0; i<N; i++) { + Host host = mHosts.get(i); + out.startTag(null, "h"); + out.attribute(null, "pkg", host.packageName); + out.attribute(null, "id", Integer.toHexString(host.hostId)); + out.endTag(null, "h"); + host.tag = i; + } + + N = mAppWidgetIds.size(); + for (int i=0; i<N; i++) { + AppWidgetId id = mAppWidgetIds.get(i); + out.startTag(null, "g"); + out.attribute(null, "id", Integer.toHexString(id.appWidgetId)); + out.attribute(null, "h", Integer.toHexString(id.host.tag)); + if (id.provider != null) { + out.attribute(null, "p", Integer.toHexString(id.provider.tag)); + } + out.endTag(null, "g"); + } + + out.endTag(null, "gs"); + + out.endDocument(); + stream.close(); + } catch (IOException e) { + try { + if (stream != null) { + stream.close(); + } + } catch (IOException ex) { + } + if (file.exists()) { + file.delete(); + } + } + } + + void readStateFromFileLocked(File file) { + FileInputStream stream = null; + + boolean success = false; + + try { + stream = new FileInputStream(file); + XmlPullParser parser = Xml.newPullParser(); + parser.setInput(stream, null); + + int type; + int providerIndex = 0; + HashMap<Integer,Provider> loadedProviders = new HashMap(); + do { + type = parser.next(); + if (type == XmlPullParser.START_TAG) { + String tag = parser.getName(); + if ("p".equals(tag)) { + // TODO: do we need to check that this package has the same signature + // as before? + String pkg = parser.getAttributeValue(null, "pkg"); + String cl = parser.getAttributeValue(null, "cl"); + Provider p = lookupProviderLocked(new ComponentName(pkg, cl)); + if (p == null && mSafeMode) { + // if we're in safe mode, make a temporary one + p = new Provider(); + p.info = new AppWidgetProviderInfo(); + p.info.provider = new ComponentName(pkg, cl); + p.zombie = true; + mInstalledProviders.add(p); + } + if (p != null) { + // if it wasn't uninstalled or something + loadedProviders.put(providerIndex, p); + } + providerIndex++; + } + else if ("h".equals(tag)) { + Host host = new Host(); + + // TODO: do we need to check that this package has the same signature + // as before? + host.packageName = parser.getAttributeValue(null, "pkg"); + try { + host.uid = getUidForPackage(host.packageName); + } catch (PackageManager.NameNotFoundException ex) { + host.zombie = true; + } + if (!host.zombie || mSafeMode) { + // In safe mode, we don't discard the hosts we don't recognize + // so that they're not pruned from our list. Otherwise, we do. + host.hostId = Integer.parseInt( + parser.getAttributeValue(null, "id"), 16); + mHosts.add(host); + } + } + else if ("g".equals(tag)) { + AppWidgetId id = new AppWidgetId(); + id.appWidgetId = Integer.parseInt(parser.getAttributeValue(null, "id"), 16); + if (id.appWidgetId >= mNextAppWidgetId) { + mNextAppWidgetId = id.appWidgetId + 1; + } + + String providerString = parser.getAttributeValue(null, "p"); + if (providerString != null) { + // there's no provider if it hasn't been bound yet. + // maybe we don't have to save this, but it brings the system + // to the state it was in. + int pIndex = Integer.parseInt(providerString, 16); + id.provider = loadedProviders.get(pIndex); + if (false) { + Log.d(TAG, "bound appWidgetId=" + id.appWidgetId + " to provider " + + pIndex + " which is " + id.provider); + } + if (id.provider == null) { + // This provider is gone. We just let the host figure out + // that this happened when it fails to load it. + continue; + } + } + + int hIndex = Integer.parseInt(parser.getAttributeValue(null, "h"), 16); + id.host = mHosts.get(hIndex); + if (id.host == null) { + // This host is gone. + continue; + } + + if (id.provider != null) { + id.provider.instances.add(id); + } + id.host.instances.add(id); + mAppWidgetIds.add(id); + } + } + } while (type != XmlPullParser.END_DOCUMENT); + success = true; + } catch (NullPointerException e) { + Log.w(TAG, "failed parsing " + file, e); + } catch (NumberFormatException e) { + Log.w(TAG, "failed parsing " + file, e); + } catch (XmlPullParserException e) { + Log.w(TAG, "failed parsing " + file, e); + } catch (IOException e) { + Log.w(TAG, "failed parsing " + file, e); + } catch (IndexOutOfBoundsException e) { + Log.w(TAG, "failed parsing " + file, e); + } + try { + if (stream != null) { + stream.close(); + } + } catch (IOException e) { + } + + if (success) { + // delete any hosts that didn't manage to get connected (should happen) + // if it matters, they'll be reconnected. + final int N = mHosts.size(); + for (int i=0; i<N; i++) { + pruneHostLocked(mHosts.get(i)); + } + } else { + // failed reading, clean up + mAppWidgetIds.clear(); + mHosts.clear(); + final int N = mInstalledProviders.size(); + for (int i=0; i<N; i++) { + mInstalledProviders.get(i).instances.clear(); + } + } + } + + File savedStateTempFile() { + return new File("/data/system/" + SETTINGS_TMP_FILENAME); + //return new File(mContext.getFilesDir(), SETTINGS_FILENAME); + } + + File savedStateRealFile() { + return new File("/data/system/" + SETTINGS_FILENAME); + //return new File(mContext.getFilesDir(), SETTINGS_TMP_FILENAME); + } + + BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() { + public void onReceive(Context context, Intent intent) { + String action = intent.getAction(); + //Log.d(TAG, "received " + action); + if (Intent.ACTION_BOOT_COMPLETED.equals(action)) { + sendInitialBroadcasts(); + } else { + Uri uri = intent.getData(); + if (uri == null) { + return; + } + String pkgName = uri.getSchemeSpecificPart(); + if (pkgName == null) { + return; + } + + if (Intent.ACTION_PACKAGE_ADDED.equals(action)) { + synchronized (mAppWidgetIds) { + Bundle extras = intent.getExtras(); + if (extras != null && extras.getBoolean(Intent.EXTRA_REPLACING, false)) { + // The package was just upgraded + updateProvidersForPackageLocked(pkgName); + } else { + // The package was just added + addProvidersForPackageLocked(pkgName); + } + saveStateLocked(); + } + } + else if (Intent.ACTION_PACKAGE_REMOVED.equals(action)) { + Bundle extras = intent.getExtras(); + if (extras != null && extras.getBoolean(Intent.EXTRA_REPLACING, false)) { + // The package is being updated. We'll receive a PACKAGE_ADDED shortly. + } else { + synchronized (mAppWidgetIds) { + removeProvidersForPackageLocked(pkgName); + saveStateLocked(); + } + } + } + } + } + }; + + // TODO: If there's a better way of matching an intent filter against the + // packages for a given package, use that. + void addProvidersForPackageLocked(String pkgName) { + Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE); + List<ResolveInfo> broadcastReceivers = mPackageManager.queryBroadcastReceivers(intent, + PackageManager.GET_META_DATA); + + final int N = broadcastReceivers.size(); + for (int i=0; i<N; i++) { + ResolveInfo ri = broadcastReceivers.get(i); + ActivityInfo ai = ri.activityInfo; + + if (pkgName.equals(ai.packageName)) { + addProviderLocked(ri); + } + } + } + + // TODO: If there's a better way of matching an intent filter against the + // packages for a given package, use that. + void updateProvidersForPackageLocked(String pkgName) { + HashSet<String> keep = new HashSet(); + Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE); + List<ResolveInfo> broadcastReceivers = mPackageManager.queryBroadcastReceivers(intent, + PackageManager.GET_META_DATA); + + // add the missing ones and collect which ones to keep + int N = broadcastReceivers.size(); + for (int i=0; i<N; i++) { + ResolveInfo ri = broadcastReceivers.get(i); + ActivityInfo ai = ri.activityInfo; + if (pkgName.equals(ai.packageName)) { + ComponentName component = new ComponentName(ai.packageName, ai.name); + Provider p = lookupProviderLocked(component); + if (p == null) { + if (addProviderLocked(ri)) { + keep.add(ai.name); + } + } else { + Provider parsed = parseProviderInfoXml(component, ri); + if (parsed != null) { + keep.add(ai.name); + // Use the new AppWidgetProviderInfo. + AppWidgetProviderInfo oldInfo = p.info; + p.info = parsed.info; + // If it's enabled + final int M = p.instances.size(); + if (M > 0) { + int[] appWidgetIds = getAppWidgetIds(p); + // Reschedule for the new updatePeriodMillis (don't worry about handling + // it specially if updatePeriodMillis didn't change because we just sent + // an update, and the next one will be updatePeriodMillis from now). + cancelBroadcasts(p); + registerForBroadcastsLocked(p, appWidgetIds); + // If it's currently showing, call back with the new AppWidgetProviderInfo. + for (int j=0; j<M; j++) { + AppWidgetId id = p.instances.get(j); + if (id.host != null && id.host.callbacks != null) { + try { + id.host.callbacks.providerChanged(id.appWidgetId, p.info); + } catch (RemoteException ex) { + // It failed; remove the callback. No need to prune because + // we know that this host is still referenced by this + // instance. + id.host.callbacks = null; + } + } + } + // Now that we've told the host, push out an update. + sendUpdateIntentLocked(p, appWidgetIds); + } + } + } + } + } + + // prune the ones we don't want to keep + N = mInstalledProviders.size(); + for (int i=N-1; i>=0; i--) { + Provider p = mInstalledProviders.get(i); + if (pkgName.equals(p.info.provider.getPackageName()) + && !keep.contains(p.info.provider.getClassName())) { + removeProviderLocked(i, p); + } + } + } + + void removeProvidersForPackageLocked(String pkgName) { + int N = mInstalledProviders.size(); + for (int i=N-1; i>=0; i--) { + Provider p = mInstalledProviders.get(i); + if (pkgName.equals(p.info.provider.getPackageName())) { + removeProviderLocked(i, p); + } + } + + // Delete the hosts for this package too + // + // By now, we have removed any AppWidgets that were in any hosts here, + // so we don't need to worry about sending DISABLE broadcasts to them. + N = mHosts.size(); + for (int i=N-1; i>=0; i--) { + Host host = mHosts.get(i); + if (pkgName.equals(host.packageName)) { + deleteHostLocked(host); + } + } + } +} + |