Android获取时间更新

Question

我希望在60秒后定期调用特定的代码补丁，以获取应用程序中更新的数据。我想知道我应该把代码放在主要的Android活动中的哪里。任何帮助我都将不胜感激

Answer 1

您可以使用Java的util包的Timer类。它将允许您再次执行特定的代码&再次以固定的时间间隔执行。看一下每5秒执行一次的example。

Answer 2

import android.os.Handler;

public class ExecuteEveryMinuteExample {
    private static final int DELAY_IN_MILLIS = 60000;

    private final Handler handler;
    private final Runnable task;

    public ExecuteEveryMinuteExample(Handler handler, Runnable runnable) {
        this.handler = handler;
        this.task = new Task(runnable);
    }

    public void start() {
        handler.postDelayed(task, DELAY_IN_MILLIS);
    }

    public void stop() {
       handler.removeCallbacks(task);
    }

    private class Task implements Runnable {
        private Runnable task;

        private Task(Runnable runnable) {
            this.task = runnable;
        }

        @Override
        public void run() {
            task.run();
            start();
        }
    }
}

此“计时器”与活动生命周期相关联，请记住在Activity#onDestroy或更好的Activity#onPause中停止它。另外，看看Timer、ScheduledThreadPoolExecutor和TimerTask，它们可能更适合你的需求。

Answer 3

使用android中的服务和广播接收器。

// Restart service every 30 seconds
  private static final long REPEAT_TIME = 1000 * 30;

  @Override
  public void onReceive(Context context, Intent intent) {
    AlarmManager service = (AlarmManager) context
        .getSystemService(Context.ALARM_SERVICE);
    Intent i = new Intent(context, MyStartServiceReceiver.class);
    PendingIntent pending = PendingIntent.getBroadcast(context, 0, i,
        PendingIntent.FLAG_CANCEL_CURRENT);
    Calendar cal = Calendar.getInstance();
    // Start 30 seconds after boot completed
    cal.add(Calendar.SECOND, 30);
    //
    // Fetch every 30 seconds
    // InexactRepeating allows Android to optimize the energy consumption
    service.setInexactRepeating(AlarmManager.RTC_WAKEUP,
        cal.getTimeInMillis(), REPEAT_TIME, pending);

有关更多信息，请参阅此站点。

http://www.vogella.com/articles/AndroidServices/article.html