Android实现简易闹钟功能

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

public class RepeatingAlarm extends BroadcastReceiver{

 @Override
 public void onReceive(Context context, Intent intent) {
  if (intent.getAction()!=null&&intent.getAction().equals("com.gcc.alarm")) {//自定义的action
   intent = new Intent(context,AlarmActivity.class);
   intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
   context.startActivity(intent);
  }
 }
}

Intent intent = new Intent(this, RepeatingAlarm.class);
intent.setAction("com.gcc.alarm");
PendingIntent sender = PendingIntent.getBroadcast(this, 0, intent, 0);
// Schedule the alarm!
AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
     am.set(AlarmManager.RTC,
       c.getTimeInMillis(), sender);//c为设置闹钟的时间的Calendar对象

/**
 * 取消闹钟
 */
private void cancleAlarm(){
 Intent intent = new Intent(AlarmActivity.this,RepeatingAlarm.class);
 intent.setAction("com.gcc.alarm");
 PendingIntent sender = PendingIntent.getBroadcast(AlarmActivity.this, 0, intent, 0);
 // And cancel the alarm.
 AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
  am.cancel(sender);//取消闹钟
 }

import android.app.Activity;
import android.app.AlarmManager;
import android.app.AlertDialog;
import android.app.PendingIntent;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.media.MediaPlayer;
import android.os.Bundle;

public class AlarmActivity extends Activity {

 MediaPlayer mp;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.aty_alarm);
  mp = new MediaPlayer();
  AssetFileDescriptor file = getResources().openRawResourceFd(R.raw.beep);
  try {
   mp.setDataSource(file.getFileDescriptor(), file.getStartOffset(),
     file.getLength());
   mp.prepare();
   file.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
  mp.setVolume(0.5f, 0.5f);
  mp.setLooping(true);
  mp.start();
  alarmOialog();
 }

 @Override
 protected void onResume() {
  super.onResume();
 }

 @Override
 protected void onDestroy() {
  super.onDestroy();
  if (mp != null) {
   if (mp.isPlaying()) {
    mp.stop();
   }
   mp.release();
  }
 }

 public void alarmOialog() {
  AlertDialog.Builder builder = new AlertDialog.Builder(this);
  builder.setMessage("你有未处理的事件");
  builder.setPositiveButton("稍后提醒",
    new DialogInterface.OnClickListener() {

     @Override
     public void onClick(DialogInterface dialogInterface, int i) {
      alarm();
      finish();
     }
    });

  builder.setNegativeButton("停止", new DialogInterface.OnClickListener() {

   @Override
   public void onClick(DialogInterface dialogInterface, int i) {
    cancleAlarm();
    finish();// 关闭窗口
   }
  });
  builder.show().setCanceledOnTouchOutside(false);
  ;

 }

 /**
  * 取消闹钟
  */
 private void cancleAlarm() {
  // Create the same intent, and thus a matching IntentSender, for
  // the one that was scheduled.
  Intent intent = new Intent(AlarmActivity.this, RepeatingAlarm.class);
  intent.setAction("com.gcc.alarm");
  PendingIntent sender = PendingIntent.getBroadcast(AlarmActivity.this,
    0, intent, 0);

  // And cancel the alarm.
  AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
  am.cancel(sender);
 }

 private void alarm() {
  // 获取系统的闹钟服务
  AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
  // 触发闹钟的时间（毫秒）
  long triggerTime = System.currentTimeMillis() + 10000;
  Intent intent = new Intent(this, RepeatingAlarm.class);
  intent.setAction("com.gcc.alarm");
  PendingIntent op = PendingIntent.getBroadcast(this, 0, intent, 0);
  // 启动一次只会执行一次的闹钟
  am.set(AlarmManager.RTC, triggerTime, op);
  // 指定时间重复执行闹钟
  // am.setRepeating(AlarmManager.RTC,triggerTime,2000,op);
 }

}

mp = new MediaPlayer();
  AssetFileDescriptor file = getResources().openRawResourceFd(R.raw.beep);
  try {
   mp.setDataSource(file.getFileDescriptor(), file.getStartOffset(),
     file.getLength());