通過廣播來實現鬧鐘
1.建立廣播接收RepeatingAlarm.java

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")) {//自定義的action
            intent = new Intent(context,AlarmActivity.class);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(intent);
        }
    }
}

2.廣播在Manifest.xml中配置：

    <receiver
 
 
            android:name=".RepeatingAlarm"
           >
            <intent-filter >  
                <action android:name="com.gcc.alarm"/>  
            </intent-filter>  
    </receiver>

3.通過程式碼設定一個鬧鐘

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為設定鬧鐘的時間的Calendar物件

4.通過程式碼取消一個鬧鐘：

/**
  * 取消鬧鐘
  */
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);//取消鬧鐘
    }

5.鬧鐘響是彈出的對化框並播放音樂用AlarmActivity.java類實現

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("你有未處理的事件");
        builder.setPositiveButton("稍後提醒",
                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();// 關閉視窗
            }
        });
        builder.show().setCanceledOnTouchOutside(false);
        ;

    }

    /**
     * 取消鬧鐘
     */
    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() {
        // 獲取系統的鬧鐘服務
        AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        // 觸發鬧鐘的時間（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);
        // 啟動一次只會執行一次的鬧鐘
        am.set(AlarmManager.RTC, triggerTime, op);
        // 指定時間重複執行鬧鐘
        // am.setRepeating(AlarmManager.RTC,triggerTime,2000,op);
    }

}

6.注：
1.aty_alarm.xml為空佈局，不需新增任何元件
2.使用MediaPlayer播放res/raw目錄下音訊檔案的方法如下：

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

7.功能不是很完善，需要的可以修改使用，鬧鐘時間設定可通過上篇博文來獲取Calendar物件。