java - 在(毫秒)中设置的特定时间后，timerTask 无法启动

Question

在下面发布的代码中，我从工作线程正在读取的文件中读取时间戳数据。我从 fie 中解析时间戳并将其传递给 timerTask，如下所示。我预计结果是一次读取 Engine Time(ms):，然后读取 systemTime(ms):。但是在每次运行时我都会以不同的顺序接收输出？如下所示。

请解释一下。

    static TimerTask timedTask = new TimerTask() {

    @Override
    public void run() {
        // TODO Auto-generated method stub
        System.out.println("timed task");
    }
};

    private static void processFile(File dataFile) throws IOException {
    // TODO Auto-generated method stub      
    Timer timer = new Timer();
    for (int i = 1; i <= logfile.getTotalLines(); i++) {
        System.out.println("Engine Time(ms): " +  
    logfile.getFileHash().get(i).getTimeStampInMilli());
        timer.schedule(new TimerTask2(), (long)  
    logfile.getFileHash().get(i).getTimeStampInMilli());
    }
    timer.cancel();
}

第一次运行后的结果:

Engine Time(ms): 0.012999999999
Engine Time(ms): 0.044000000002
Engine Time(ms): 0.044000000002
Engine Time(ms): 0.063999999998
Engine Time(ms): 0.074000000001
Engine Time(ms): 0.084000000003
Engine Time(ms): 0.093999999997
Engine Time(ms): 0.093999999997
Engine Time(ms): 0.103999999999
Engine Time(ms): 0.114000000001
systemTime(ms): 1417614184001

第二次运行后的结果:

Engine Time(ms): 0.012999999999
Engine Time(ms): 0.044000000002
Engine Time(ms): 0.044000000002
Engie Time(ms): 0.063999999998
Engine Time(ms): 0.074000000001
systemTime(ms): 1417614304811
systemTime(ms): 1417614304811
systemTime(ms): 1417614304811
systemTime(ms): 1417614304811
systemTime(ms): 1417614304811
Engine Time(ms): 0.084000000003
Engine Time(ms): 0.093999999997
systemTime(ms): 1417614304811
Engine Time(ms): 0.093999999997
systemTime(ms): 1417614304811
Engine Time(ms): 0.103999999999
systemTime(ms): 1417614304811
Engine Time(ms): 0.114000000001
systemTime(ms): 1417614304811

Answer 1

我遇到了同样的问题，我发现解决这个问题的方法是使用 AlarmManager 类

这是例子

BroadcastReceiver br;
AlarmManager alarmManager;

在 onCreate() 中调用:

setupAlarmManager();
alarmManager.set( AlarmManager.ELAPSED_REALTIME,SystemClock.elapsedRealtime() + 
             10000, pi ); 

方法:

private void setupAlarmManager() {
      br = new BroadcastReceiver() {
             @Override
             public void onReceive(Context c, Intent i) {
                alarmManager.set(AlarmManager.ELAPSED_REALTIME,SystemClock.elapsedRealtime() + 
                         10000, pi );
                }
             };
      registerReceiver(br, new IntentFilter("urPackageName") );
      pi = PendingIntent.getBroadcast( context, 0, new Intent("urPackageName"),
      0 );
      alarmManager = (AlarmManager)(context.getSystemService( Context.ALARM_SERVICE ));
}