android - 如何更新我的通知以显示我的时间计数器发生变化？

Question

我即将完成我正在制作的这个玩具应用游戏。

问题:我的通知总是显示我的计数器为 30000。为什么它没有计时？

我做了什么:我已经实现了一个简单的服务类和一个自定义计时器来计时。最后，一旦我确定计时器正常工作，我就会退出整个游戏。

这是我的代码:

package com.example.redshirtmarblez;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.CountDownTimer;
import android.os.IBinder;
import android.widget.Toast;

public class TimingService extends Service{

    public long counter = 30000;
    private Context ctx;
    private Activity localActivity;


    private NotificationManager nm;

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onCreate() 
    {
          super.onCreate();
          nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
          declareNotification();
          timer.start();
          //Toast.makeText(this, "Timer is :" + counter, Toast.LENGTH_LONG).show();
          //showNotification();
    }


    public void getActivity(Activity activity)
    {
        localActivity = activity;
    }

    //count to end the game
    public CountDownTimer timer = new CountDownTimer(30000, 1000){

        public void onTick(long millisUntilFinished){
            counter = millisUntilFinished / 1000;
        }

        public void onFinish(){
             counter = 0;


 //Kill the game 
             int i = android.os.Process.myPid();
             android.os.Process.killProcess(i);

        }

    };

    /*
     * Show a notification while this service is running 
     */
    public void declareNotification()
    {
        //Declare a new notification 
        Notification notification = new Notification(R.drawable.ic_launcher, "A New Notification", System.currentTimeMillis());

        notification.flags |= Notification.FLAG_ONGOING_EVENT;
        notification.flags |= Notification.FLAG_FOREGROUND_SERVICE;

        Intent intent = new Intent(this, TimingService.class);
        PendingIntent activity = PendingIntent.getActivity(this, 0, intent, 0);
        notification.setLatestEventInfo(this, "herp", "counter: " + counter, activity);


  //This is clearly not 1337, but a good joke
            startForeground(1337, notification);

    }

}

它运行时所做的一切就是显示“A New Notification”，然后更改为“herp counter: 30000”。但是，此通知永远不会更改。它只是保持 30000。为什么？我以为我通过让旗帜持续存在来解决这个问题？

Answer 1

https://developer.android.com/reference/android/app/Notification.Builder.html#setUsesChronometer(boolean)

Show the when field as a stopwatch. Instead of presenting when as a timestamp, the notification will show an automatically updating display of the minutes and seconds since when. Useful when showing an elapsed time (like an ongoing phone call). The counter can also be set to count down to when when using setChronometerCountDown(boolean).

无需更新，使用 setWhen() 值

NotificationCompat.Builder notification = new NotificationCompat.Builder(context)
        .setSmallIcon(R.mipmap.ic_default_notification)
        .setTicker("Ticker Text")  
        .setWhen(when)  // the time stamp, you will probably use System.currentTimeMillis() for most scenarios
        .setUsesChronometer(true)
        .setContentTitle("Title Text")
        .setContentText("Content Text");