运行服务时活动冻结

时间:2013-02-14 15:13:47

标签: java android service android-asynctask freeze

我有一个按钮,按下后,启动服务。此服务开始从设备记录信息。然而,当我按下跑步时,屏幕在记录时暂时冻结约8秒,然后一旦完成屏幕解冻,就会显示一个祝酒消息(这意味着只要按下按钮就会显示)然后我可以做任何事情。如果我再次进入应用程序屏幕,当应用程序正在记录时(注意:服务始终在运行以便不冻结它,只记录日志)然后活动再次冻结,并且在记录完成之前不让我做任何事情。

我尝试过asynctasks并在一个新的runnable / new线程上运行,但这些似乎都不适用于我。无论我是否正确实施它我都不确定,但我想解决这个问题。

这是我在服务类中的onStartCommand:

    @Override
public int onStartCommand(Intent intent, int flags, int startId) {
    // THIS WOULD BE THE METHOD THAT RUNS WHATEVER YOU WANT TO DO EVERY SO OFTEN SO FOR ME THIS IS GETTING ALL DATA ETC
    getProcessInfo();

    //  LOG DELAY = SECONDS BETWEEN RUNNING SERVICE/METHOD. SET AT THE TOP
    myPendingIntent = PendingIntent.getService(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    Alarmmgr.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+LOG_DELAY*1000, myPendingIntent);
    Intent notificationIntent = new Intent(this, LogOrCheck.class);
    PendingIntent contentIntent = PendingIntent.getActivity(this,
            101, notificationIntent,
            PendingIntent.FLAG_NO_CREATE);

    NotificationManager nm = (NotificationManager) this
            .getSystemService(Context.NOTIFICATION_SERVICE);

    Resources res = this.getResources();
    Notification.Builder builder = new Notification.Builder(this);

    builder.setContentIntent(contentIntent)
                .setSmallIcon(R.drawable.arrow_up_float)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.arrow_down_float))
                .setWhen(System.currentTimeMillis())
                .setAutoCancel(true)
                .setContentTitle("Androigenius")
                .setContentText("Service running OK");
    Notification n = builder.getNotification();


    startForeground(100, n);
    return Service.START_STICKY;
}

这就是我调用startService的地方:

but1.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

            if (isClicked) {
                Context context = getApplicationContext();
                Toast toast = Toast.makeText(context, "Please press 'MINIMIZE' at the top to continue logging.", Toast.LENGTH_LONG);
                toast.setGravity(Gravity.TOP|Gravity.RIGHT, 10, 55);
                toast.show();
                System.out.println("Start logging");
                but1.setText("Stop Logging");
                but1.setTextColor(Color.RED);
                // START SERVICE, DONE. (STOP IS BELOW).
                startService(myIntent);
                isClicked = false;
            } 
            else if (!isClicked) {
                System.out.println("Stop Logging");
                but1.setText("Start Logging");
                // STOP SERVICE, DONE.
                stopService(myIntent);
                but1.setTextColor(getResources().getColor(color.cornblue));
                isClicked = true;
            }

2 个答案:

答案 0 :(得分:1)

服务在导致'冻结'的UI线程上运行。使用IntentService将创建一个自动在后台运行的服务,而不是在UI线程上运行。以下是IntentService类的一些细节:

IntentService Class

答案 1 :(得分:0)

默认情况下,服务也会在您的应用程序的主线程中运行,您的UI操作将在该主线程中运行。因此,如果在onStartCommand()方法中执行长任务,它将阻止主线程。

要避免此问题,您必须将日志记录任务迁移到单独的线程中。您可以使用AsycTask类来执行此操作。有关如何使用该课程,请参阅http://developer.android.com/reference/android/os/AsyncTask.html