/*
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.appwidget;
import android.content.Context;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.widget.RemoteViews;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import com.android.internal.appwidget.IAppWidgetHost;
import com.android.internal.appwidget.IAppWidgetService;
/**
* AppWidgetHost provides the interaction with the AppWidget service for apps,
* like the home screen, that want to embed AppWidgets in their UI.
*/
public class AppWidgetHost {
static final int HANDLE_UPDATE = 1;
static final int HANDLE_PROVIDER_CHANGED = 2;
static Object sServiceLock = new Object();
static IAppWidgetService sService;
Context mContext;
String mPackageName;
class Callbacks extends IAppWidgetHost.Stub {
public void updateAppWidget(int appWidgetId, RemoteViews views) {
Message msg = mHandler.obtainMessage(HANDLE_UPDATE);
msg.arg1 = appWidgetId;
msg.obj = views;
msg.sendToTarget();
}
public void providerChanged(int appWidgetId, AppWidgetProviderInfo info) {
Message msg = mHandler.obtainMessage(HANDLE_PROVIDER_CHANGED);
msg.arg1 = appWidgetId;
msg.obj = info;
msg.sendToTarget();
}
}
class UpdateHandler extends Handler {
public UpdateHandler(Looper looper) {
super(looper);
}
public void handleMessage(Message msg) {
switch (msg.what) {
case HANDLE_UPDATE: {
updateAppWidgetView(msg.arg1, (RemoteViews)msg.obj);
break;
}
case HANDLE_PROVIDER_CHANGED: {
onProviderChanged(msg.arg1, (AppWidgetProviderInfo)msg.obj);
break;
}
}
}
}
Handler mHandler;
int mHostId;
Callbacks mCallbacks = new Callbacks();
HashMap<Integer,AppWidgetHostView> mViews = new HashMap();
public AppWidgetHost(Context context, int hostId) {
mContext = context;
mHostId = hostId;
mHandler = new UpdateHandler(context.getMainLooper());
synchronized (sServiceLock) {
if (sService == null) {
IBinder b = ServiceManager.getService(Context.APPWIDGET_SERVICE);
sService = IAppWidgetService.Stub.asInterface(b);
}
}
}
/**
* Start receiving onAppWidgetChanged calls for your AppWidgets. Call this when your activity
* becomes visible, i.e. from onStart() in your Activity.
*/
public void startListening() {
int[] updatedIds = null;
ArrayList<RemoteViews> updatedViews = new ArrayList();
try {
if (mPackageName == null) {
mPackageName = mContext.getPackageName();
}
updatedIds = sService.startListening(mCallbacks, mPackageName, mHostId, updatedViews);
}
catch (RemoteException e) {
throw new RuntimeException("system server dead?", e);
}
final int N = updatedIds.length;
for (int i=0; i<N; i++) {
updateAppWidgetView(updatedIds[i], updatedViews.get(i));
}
}
/**
* Stop receiving onAppWidgetChanged calls for your AppWidgets. Call this when your activity is
* no longer visible, i.e. from onStop() in your Activity.
*/
public void stopListening() {
try {
sService.stopListening(mHostId);
}
catch (RemoteException e) {
throw new RuntimeException("system server dead?", e);
}
}
/**
* Get a appWidgetId for a host in the calling process.
*
* @return a appWidgetId
*/
public int allocateAppWidgetId() {
try {
if (mPackageName == null) {
mPackageName = mContext.getPackageName();
}
return sService.allocateAppWidgetId(mPackageName, mHostId);
}
catch (RemoteException e) {
throw new RuntimeException("system server dead?", e);
}
}
/**
* Stop listening to changes for this AppWidget.
*/
public void deleteAppWidgetId(int appWidgetId) {
synchronized (mViews) {
mViews.remove(appWidgetId);
try {
sService.deleteAppWidgetId(appWidgetId);
}
catch (RemoteException e) {
throw new RuntimeException("system server dead?", e);
}
}
}
/**
* Remove all records about this host from the AppWidget manager.
* <ul>
* <li>Call this when initializing your database, as it might be because of a data wipe.</li>
* <li>Call this to have the AppWidget manager release all resources associated with your
* host. Any future calls about this host will cause the records to be re-allocated.</li>
* </ul>
*/
public void deleteHost() {
try {
sService.deleteHost(mHostId);
}
catch (RemoteException e) {
throw new RuntimeException("system server dead?", e);
}
}
/**
* Remove all records about all hosts for your package.
* <ul>
* <li>Call this when initializing your database, as it might be because of a data wipe.</li>
* <li>Call this to have the AppWidget manager release all resources associated with your
* host. Any future calls about this host will cause the records to be re-allocated.</li>
* </ul>
*/
public static void deleteAllHosts() {
try {
sService.deleteAllHosts();
}
catch (RemoteException e) {
throw new RuntimeException("system server dead?", e);
}
}
public final AppWidgetHostView createView(Context context, int appWidgetId,
AppWidgetProviderInfo appWidget) {
AppWidgetHostView view = onCreateView(context, appWidgetId, appWidget);
view.setAppWidget(appWidgetId, appWidget);
synchronized (mViews) {
mViews.put(appWidgetId, view);
}
RemoteViews views = null;
try {
views = sService.getAppWidgetViews(appWidgetId);
} catch (RemoteException e) {
throw new RuntimeException("system server dead?", e);
}
view.updateAppWidget(views);
return view;
}
/**
* Called to create the AppWidgetHostView. Override to return a custom subclass if you
* need it. {@more}
*/
protected AppWidgetHostView onCreateView(Context context, int appWidgetId,
AppWidgetProviderInfo appWidget) {
return new AppWidgetHostView(context);
}
/**
* Called when the AppWidget provider for a AppWidget has been upgraded to a new apk.
*/
protected void onProviderChanged(int appWidgetId, AppWidgetProviderInfo appWidget) {
}
void updateAppWidgetView(int appWidgetId, RemoteViews views) {
AppWidgetHostView v;
synchronized (mViews) {
v = mViews.get(appWidgetId);
}
if (v != null) {
v.updateAppWidget(views);
}
}
}
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