src/com/android/browser/widget/BookmarkThumbnailWidgetProvider.java

/*
 * Copyright (C) 2010 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.browser.widget;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.widget.RemoteViews;

import com.android.browser.BrowserActivity;
import com.android.browser.R;

/**
 * Widget that shows a preview of the user's bookmarks.
 */
public class BookmarkThumbnailWidgetProvider extends AppWidgetProvider {
    public static final String ACTION_BOOKMARK_APPWIDGET_UPDATE =
        "com.android.browser.BOOKMARK_APPWIDGET_UPDATE";

    @Override
    public void onReceive(Context context, Intent intent) {
        // Handle bookmark-specific updates ourselves because they might be
        // coming in without extras, which AppWidgetProvider then blocks.
        final String action = intent.getAction();
        if (ACTION_BOOKMARK_APPWIDGET_UPDATE.equals(action)) {
            AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
            performUpdate(context, appWidgetManager,
                    appWidgetManager.getAppWidgetIds(getComponentName(context)));
        } else {
            super.onReceive(context, intent);
        }
    }

    @Override
    public void onUpdate(Context context, AppWidgetManager mngr, int[] ids) {
        performUpdate(context, mngr, ids);
    }

    @Override
    public void onDeleted(Context context, int[] appWidgetIds) {
        super.onDeleted(context, appWidgetIds);
        for (int widgetId : appWidgetIds) {
            BookmarkThumbnailWidgetService.deleteWidgetState(context, widgetId);
        }
        removeOrphanedFiles(context);
    }

    @Override
    public void onDisabled(Context context) {
        super.onDisabled(context);
        removeOrphanedFiles(context);
    }

    /**
     *  Checks for any state files that may have not received onDeleted
     */
    void removeOrphanedFiles(Context context) {
        AppWidgetManager wm = AppWidgetManager.getInstance(context);
        int[] ids = wm.getAppWidgetIds(getComponentName(context));
        BookmarkThumbnailWidgetService.removeOrphanedStates(context, ids);
    }

    private void performUpdate(Context context,
            AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        PendingIntent launchBrowser = PendingIntent.getActivity(context, 0,
                new Intent(BrowserActivity.ACTION_SHOW_BROWSER, null, context,
                    BrowserActivity.class),
                PendingIntent.FLAG_UPDATE_CURRENT);
        for (int appWidgetId : appWidgetIds) {
            Intent updateIntent = new Intent(context, BookmarkThumbnailWidgetService.class);
            updateIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
            updateIntent.setData(Uri.parse(updateIntent.toUri(Intent.URI_INTENT_SCHEME)));
            RemoteViews views = new RemoteViews(context.getPackageName(),
                    R.layout.bookmarkthumbnailwidget);
            views.setOnClickPendingIntent(R.id.app_shortcut, launchBrowser);
            views.setRemoteAdapter(R.id.bookmarks_list, updateIntent);
            appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetId, R.id.bookmarks_list);
            Intent ic = new Intent(context, BookmarkWidgetProxy.class);
            views.setPendingIntentTemplate(R.id.bookmarks_list,
                    PendingIntent.getBroadcast(context, 0, ic,
                    PendingIntent.FLAG_UPDATE_CURRENT));
            appWidgetManager.updateAppWidget(appWidgetId, views);
        }
    }

    /**
     * Build {@link ComponentName} describing this specific
     * {@link AppWidgetProvider}
     */
    static ComponentName getComponentName(Context context) {
        return new ComponentName(context, BookmarkThumbnailWidgetProvider.class);
    }

    public static void refreshWidgets(Context context) {
        context.sendBroadcast(new Intent(
                BookmarkThumbnailWidgetProvider.ACTION_BOOKMARK_APPWIDGET_UPDATE,
                null, context, BookmarkThumbnailWidgetProvider.class));
    }

}