The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...
/*
 * Copyright (C) 2008 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.example.android.apis.appwidget;

import android.appwidget.AppWidgetManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

import java.util.ArrayList;

/**
 * A BroadcastReceiver that listens for updates for the ExampleAppWidgetProvider.  This
 * BroadcastReceiver starts off disabled, and we only enable it when there is a widget
 * instance created, in order to only receive notifications when we need them.
 */
public class ExampleBroadcastReceiver extends BroadcastReceiver  {

    @Override
     public void onReceive(Context context, Intent intent) {
        Log.d("ExmampleBroadcastReceiver", "intent=" + intent);

        // For our example, we'll also update all of the widgets when the timezone
        // changes, or the user or network sets the time.
        String action = intent.getAction();
        if (action.equals(Intent.ACTION_TIMEZONE_CHANGED)
                || action.equals(Intent.ACTION_TIME_CHANGED)) {
            AppWidgetManager gm = AppWidgetManager.getInstance(context);
            ArrayList<Integer> appWidgetIds = new ArrayList<Integer>();
            ArrayList<String> texts = new ArrayList<String>();

             ExampleAppWidgetConfigure.loadAllTitlePrefs(context, appWidgetIds, texts);

            final int N = appWidgetIds.size();
            for (int i=0; i<N; i++) {
                 ExampleAppWidgetProvider.updateAppWidget(context, gm, appWidgetIds.get(i), texts.get(i));
            }
        }
    }

}
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