Question

我希望在60秒后定期调用特定的代码补丁，以获取应用程序中的更新数据。我想知道我应该把代码放在主Android活动中。任何帮助将不胜感激感谢

Answer 1

您可以使用 Timer 类的Java util包。它将允许您再次执行特定代码。再次定期。看看每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中将其停在Activity#onPause或更好。{{1}}。结帐Timer，ScheduledThreadPoolExecutor和TimerTask它们可能会更好地满足您的需求。

Answer 3

在android中使用服务和广播接收器。

// 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);

请参阅此网站以获取更多信息。

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

Android获取时间更新

3 个答案: