samples/Support4Demos/src/com/example/android/supportv4/content/SimpleWakefulController.java

/*
 * Copyright (C) 2013 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.supportv4.content;

import com.example.android.supportv4.R;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.util.Calendar;

public class SimpleWakefulController extends Activity {
    Toast mToast;

    @Override
	protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.wakeful_alarm_controller);

        // Watch for button clicks.
        Button button = (Button)findViewById(R.id.schedule);
        button.setOnClickListener(mScheduleListener);
    }

    private View.OnClickListener mScheduleListener = new View.OnClickListener() {
        public void onClick(View v) {
            // When the alarm goes off, we want to broadcast an Intent to our
            // BroadcastReceiver.  Here we make an Intent with an explicit class
            // name to have our own receiver (which has been published in
            // AndroidManifest.xml) instantiated and called, and then create an
            // IntentSender to have the intent executed as a broadcast.
            Intent intent = new Intent(SimpleWakefulController.this, SimpleWakefulReceiver.class);
            PendingIntent sender = PendingIntent.getBroadcast(SimpleWakefulController.this,
                    0, intent, 0);

            // We want the alarm to go off 30 seconds from now.
            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(System.currentTimeMillis());
            calendar.add(Calendar.SECOND, 30);

            // Schedule the alarm!
            AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
            am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);

            // Tell the user about what we did.
            if (mToast != null) {
                mToast.cancel();
            }
            mToast = Toast.makeText(SimpleWakefulController.this, R.string.simple_wakeful_scheduled,
                    Toast.LENGTH_LONG);
            mToast.show();
        }
    };
}