Android - 按下主页按钮后，Activity会从处理程序开始

Question

I have some activities(Say A & B), And from one activity I am calling another activity by using Handler-post Delayed method.

My logic is in App starts with Activity A,and after 3 seconds goes to Activity B. & After 3 seconds, it is working perfectly.

The problem is I have set a time delay of three seconds.And During these three seconds , If I click home button , It goes background and immediately after the specified three seconds of time the application is coming back to the foreground and showing the Next Activity.

       try {

        handler.postDelayed(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub


                finish();
                Intent i = new Intent(Asplash.this, Example.class);
                i.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
                startActivity(i);
            }
        }, 3000);

    } catch (Exception e) {
        // TODO: handle exception
        e.printStackTrace();
    }

}




   @Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    // TODO Auto-generated method stub
       handler.removeCallbacksAndMessages(null);
       finish();

    return super.onKeyDown(keyCode, event);
}

I am using code like this , and for back button during the HANDLER TIME is working fine and the application is completely going background. , But if I press HOME button, it initially goes background and after the completion of HANDLER TIME(3000), application is coming to fore ground. I want it to be in background only after I press Home button also.

Please suggest me>

Answer 1

You just put this in your onPause() method of your activity:

@Override
public void onPause() {
    handler.removeCallbacksAndMessages(null);
    super.onPause();
}

So when your app goes to the background, it will remove the callbacks on the Handler. This also works for the back button AND the home button.

Answer 2

You shold start handler from onResume() method like:

@Override
public void onResume() {
    try {
         handler.postDelayed(new Runnable() {

            @Override
            public void run() {
                finish();
                Intent i = new Intent(Asplash.this, Example.class);
                i.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
                startActivity(i);
           }
         }, 3000);

       } catch (Exception e) {
           e.printStackTrace();
       }
}

And remove handle in onPause() Like :

@Override
public void onPause() {
    handler.removeCallbacksAndMessages(null);
    super.onPause();
}

This will make sure to start other activity, even if you press home within 3 second