Android利用AlarmManager定时设置Notification但是不能按时生成通知的问题

[weixin_41956660]

初学安卓，完成作业时发现自己写的通知如果自定义一个instance则不能按时在虚拟机上出现，但是如果把时间改成System.currentTimeMillis()，就会在点击add按钮的一瞬间有通知。想要的效果是点击set alarm的按钮后能弹出选择对话框，选择时间后add之后就会后台开始计时，到点有通知产生。希望能有大佬帮忙看一下问题出在哪里。谢谢！

这是在activity里面写的：

	public void onClickSetAlarm(View arg0){
		 final String items[] = {"0 min", "5 min", "10 min", "15 min"};
		
		  
	        AlertDialog dialog = new AlertDialog.Builder(this)
	                .setIcon(R.drawable.ic_launcher)
	                .setTitle("Choose time")
	                .setSingleChoiceItems(items, 1, new DialogInterface.OnClickListener() {
	                    @Override
	                    public void onClick(DialogInterface dialog, int which) {
	                       if(which == 0){
	                    	   beforeTime = 0;
	                       }
	                       if(which == 1){
	                    	   beforeTime = 2;
	                       }
	                       if(which == 2){
	                    	   beforeTime = 10;
	                       }
	                       if(which == 3){
	                    	   beforeTime = 15;
	                       }
	                    }
	                })
	                .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
	                    @Override
	                    public void onClick(DialogInterface dialog, int which) {
	                        dialog.dismiss();
	                    }
	                })
	                .setPositiveButton("Add", new DialogInterface.OnClickListener() {
	                	 
	                    @Override
	                    public void onClick(DialogInterface dialog, int which) {
	                		AlarmManager alarm = (AlarmManager)getSystemService(ALARM_SERVICE);
	                    	Calendar instance = Calendar.getInstance();
		                    instance.set(Calendar.HOUR_OF_DAY, 21);//小时
		                    instance.set(Calendar.MINUTE, 25);//分钟
		                    instance.set(Calendar.SECOND, 0);//秒
	                    	Intent intent = new Intent(DetailActivity.this,AutoReceiver.class);
	                    	intent.setAction("VIDEO_TIMER");
	                    	PendingIntent pi = PendingIntent.getBroadcast(DetailActivity.this,0, intent, 0);
	                    	alarm.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),5*1000, pi);  
	                    }
	                })
	                .create();
	        dialog.show();
	      


	}

这是receiver：

package com.example.myschedule;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class AutoReceiver extends BroadcastReceiver {
	private static final int NOTIFICATION_FLAG = 0;
	@Override
	public void onReceive(Context context, Intent intent) {
		if(intent.getAction().equals("VIDEO_TIMER")){
			PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, new Intent(context,DetailActivity.class), 0);
			Notification notify = new Notification.Builder(context)
					.setSmallIcon(R.drawable.ic_launcher)
					.setTicker("You have class!")
					.setContentTitle("You have a class!")
					.setContentText("You will have a class soon!")
					.setContentIntent(pendingIntent).setNumber(1).build();
			
			notify.flags|= Notification.FLAG_AUTO_CANCEL;
			NotificationManager manager = (NotificationManager)context
					.getSystemService(Context.NOTIFICATION_SERVICE);
			manager.notify(NOTIFICATION_FLAG,notify);
		}

	}

}

这是Manifest.xml:

 <receiver
            android:name=".AutoReceiver"
            android:label="@string/title_activity_detail" >
     	</receiver>

感谢大佬们！

[YXTS122]

换一台手机试试呗，看看行不行。。。。。。。。。。