android 闹钟app源码(Alarm)

package com.dindy.memo;

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.media.MediaPlayer;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;

public class alarmActivity extends Activity {
 MediaPlayer mp=null;
 String content=null;
 String name;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  Intent intent=getIntent();
  name=intent.getStringExtra("name");
  //唤醒屏幕
  Window window=getWindow();
  window.addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD|
    WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
  window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON|
    WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
  
  setContentView(R.layout.alarm);
  mp=MediaPlayer.create(this,R.raw.ling);
  mp.setLooping(true);
 }
 @Override
 protected void onDestroy() {
  super.onDestroy();
  if(mp!=null){
   if(mp.isPlaying()){
    mp.stop();
   }
  mp.release();
  }
 }
 @Override
 protected void onResume() {
  super.onResume();
  showalarmDialog();
 }
 public void showalarmDialog(){
  mp.start();
  AlertDialog.Builder builder=new AlertDialog.Builder(this);
  
  builder.setTitle("备忘");
  builder.setMessage(name);
  builder.setCancelable(false);
  builder.setPositiveButton("再次提醒", new DialogInterface.OnClickListener() {
   
   @Override
   public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    again();
    finish();
   }
  });
  builder.setNegativeButton("知道了", new DialogInterface.OnClickListener() {
   
   @Override
   public void onClick(DialogInterface arg0, int arg1) {
    // TODO Auto-generated method stub 
    finish();
   }
  }); 
  builder.show();     
 }
 public void again(){
  AlarmManager am=(AlarmManager) getSystemService(Context.ALARM_SERVICE);
  long triggerAtMillis=System.currentTimeMillis() 300000;
  Intent intent=new Intent(this,alarmActivity.class);
  intent.putExtra("name", name);
  PendingIntent operation=PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
  am.set(AlarmManager.RTC_WAKEUP, triggerAtMillis, operation);
 }
}