Android系统闹钟问题

import android.app.Activity;

import android.app.AlarmManager;

import android.app.PendingIntent;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class StartTiming extends Activity {

   

    public final String MYACTION = "android.intent.action.STARTMYAP";

   

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

       

        Button btn = (Button)this.findViewById(R.id.btnClose);

        btn.setOnClickListener(new OnClickListener(){

            @Override

            public void onClick(View v) {

                // TODO Auto-generated method stub

                StartTiming.this.finish();

            }

        });

        AlarmManager am = (AlarmManager)this.getSystemService(Context.ALARM_SERVICE);

        Intent intent = new Intent(MYACTION);

        PendingIntent pi = PendingIntent.getBroadcast(this, 0, intent, 1);

        am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+15000, pi);//15秒钟以后启动

    }

}

  

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.util.Log;

public class AlarmReceiver extends BroadcastReceiver{

    public final String MYTAG = "Ray";

    @Override

    public void onReceive(Context context, Intent intent) {

        // TODO Auto-generated method stub

        Log.v(MYTAG,"I am AlarmReceiver,I receive the message");

        Intent in = new Intent();

        in.setClass(context, StartTiming.class);

        in.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        context.startActivity(in);

    }

}

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

      package="com.ray.test"

      android:versionCode="1"

      android:versionName="1.0" android:installLocation="auto">

    <application android:icon="@drawable/icon" android:label="@string/app_name">

        <activity android:name=".StartTiming"

                  android:label="@string/app_name">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <receiver android:name="AlarmReceiver">

               <intent-filter>

                 <action android:name="android.intent.action.STARTMYAP"/>

             </intent-filter>

        </receiver>

    </application>

</manifest>

二、

private void startAlarmService(){

Intent intent =new Intent(this, AlarmServiceBroadcastReceiver.class);

intent.setAction("repeating");

sender=PendingIntent

.getBroadcast(this, 0, intent, 0);

//开始时间

long firstime=SystemClock.elapsedRealtime();

am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP

, firstime, 20*1000, sender);

}