Activity doesn't fire the onStop event

Question

My code list as follow:

public class MainActivity extends Activity{
    private String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.d(TAG, "onCreate");
    }

    @Override
    public void onBackPressed() {
        Log.d(TAG, "onBackPressed");
        moveTaskToBack(true);
    }

    @Override
    protected void onStart() {
        Log.d(TAG, "onStart");
        super.onStart();
    }

    @Override
    protected void onResume() {
        Log.d(TAG, "onResume");
        super.onResume();
    }

    @Override
    protected void onPause() {
        Log.d(TAG, "onPause");
        super.onPause();
    }
    @Override
    protected void onStop() {
        Log.d(TAG, "onStop");
        super.onStop();
    }

    @Override
    protected void onDestroy() {
        Log.d(TAG, "onDestroy");
        super.onDestroy();
    }
}

My test result is:

11-29 15:20:09.850  4626  4626 D MainActivity: onCreate

11-29 15:20:09.851  4626  4626 D MainActivity: onStart

11-29 15:20:09.852  4626  4626 D MainActivity: onResume

11-29 15:20:18.887  4626  4626 D MainActivity: onBackPressed

11-29 15:20:18.909  4626  4626 D MainActivity: onPause

11-29 15:20:19.718  4626  4626 D MainActivity: onStop

11-29 15:20:29.471  4626  4626 D MainActivity: onStart

11-29 15:20:29.471  4626  4626 D MainActivity: onResume

11-29 15:20:32.030  4626  4626 D MainActivity: onBackPressed

11-29 15:20:32.050  4626  4626 D MainActivity: onPause

My Test Step:

Enter any 3rd App's Ui;
Use eclipse to run or debug my app, then my app will cover the 3rd app and be shown on the top;
Then press back-key many times as quickly as I can and go to desktop (home launcher).

If the result has onStop, maybe your press not so quick and then try.

Now I want to know whether the activity is visuable, but sometimes the onStop can't be called, please help me. thank you!

KeLiuyue · Answer 1 · 2017-11-30T01:00:30.500

0

Remove moveTaskToBack(true);

And add super.onBackPressed();

@Override
public void onBackPressed() {
    Log.d(TAG, "onBackPressed");
    super.onBackPressed();
}

Edit

In one second , let it not press for twice .

private long lastTime;

@Override
public void onBackPressed() {
    long currentTime = System.currentTimeMillis();
    if (currentTime - lastTime < 1000) {
        moveTaskToBack(true);
    } else {
        Log.e("TAG", "pressed again");
        lastTime = currentTime;
    }
}

edited Nov 30 '17 at 01:00

answered Nov 29 '17 at 08:00

KeLiuyue

8,149
4
25
42

Because I want to reuse the activity which have some variables and states, so I just wan't to push it to background but not destroy it, thank you! – user9024209 Nov 29 '17 at 08:06
If you do want to reuse it .And you use `moveTaskToBack(true);` ,it just like you pressed `home button` .So it will not call `onStop` method . – KeLiuyue Nov 29 '17 at 08:08
If I pressed home button and onStop will be called, it's no problem – user9024209 Nov 29 '17 at 08:16
And you can look https://stackoverflow.com/questions/13197281/what-is-the-purpose-of-using-movetasktoback-method-in-android – KeLiuyue Nov 29 '17 at 08:28
I have seen the link, and it can't resolve my problem. – user9024209 Nov 29 '17 at 08:34
It's no problem when you pressed home button, but if you pressed back button like the test step,the onStop will not be called. – user9024209 Dec 01 '17 at 02:48
Could you try my edited ?Let the pressed for only once . – KeLiuyue Dec 01 '17 at 02:50
It may be android's bug . – user9024209 Dec 01 '17 at 02:50
May be .Sometimes the android will cause some strange bug. – KeLiuyue Dec 01 '17 at 02:52
So we can do this to prevent continuous press .You can try it . – KeLiuyue Dec 01 '17 at 02:55

Activity doesn't fire the onStop event

1 Answers1