onBackPressed to hide Not destroy activity

Question

i know how to cancel back keypress, so that the activity / main window stays visible:

public void onBackPressed() {
    return;             
}

my aim is to hide the activity, however, without finishing it, how do you do that in the onBackPressed event?

i.e. I would like to get as far as onPause(), but not evoke the onBackPressed() default behaviour that essentially calls finish(). another way to put it is that i would like to mimic onUserLeaveHint() ?

any help appreciated!

score 64 · Accepted Answer · edited May 23 '17 at 11:47

64

If you want to mimic the "Home" button on specific Activities just do this:

Below API 5:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        moveTaskToBack(true);
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

Above and on API 5:

@Override
public void onBackPressed() {
  moveTaskToBack(true);
}

It will move the Task to background.. when you return, it will be as it was.

You can see more information about this here: Override back button to act like home button

edited May 23 '17 at 11:47

Community

1
1

answered May 06 '11 at 16:51

neteinstein

17,529
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11

I ended up with this, fantastic working one-line solution! `public void onBackPressed() { moveTaskToBack(true); return; }` – Cel May 06 '11 at 17:09
1

That method is available on most recent APIs, you should of course also override it. :-) – neteinstein May 06 '11 at 17:10
1

Hii, this hide my whole application but i want just hide particular Activity not a whole application.. – Savan Kachhiya Patel Jul 22 '15 at 11:16
1

@Cel btw, you don't need the return on the onBackPressed :-) – neteinstein Feb 24 '16 at 10:11

score 18 · Answer 2 · edited May 13 '15 at 17:44

If you want to mimic the "Home" button on specific Activities :

1st Method :

@Override
public void onBackPressed() {
   Log.d("CDA", "onBackPressed Called");
   Intent setIntent = new Intent(Intent.ACTION_MAIN);
   setIntent.addCategory(Intent.CATEGORY_HOME);
   setIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
   startActivity(setIntent);
}

2nd Method :

@Override
public void onBackPressed() {
   moveTaskToBack(true);
}

And if you want to move to the previous activity without destroying current :

@Override
public void onBackPressed() {
    startActivity(new Intent(CurrentActivity.this, DestinationActivity.class);
}

And now from any activity if you want to open the activity which is in Background . I name CurrentActivity. you could call it form anywhere..like..it wil take that actvity and put it to top of stack . and open it where you left off.

Intent intent = new Intent(FromAnyActivity.this, CurrentActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(intent);

Flags :

FLAG_ACTIVITY_REORDER_TO_FRONT : To reorder the activity from stack

FLAG_ACTIVITY_CLEAR_TOP : To remove all the activities from the top

score 5 · Answer 3 · answered Oct 22 '13 at 23:40

5

If you don't destroy your activity you must set acitvity launch mode to single_instance and use moveTaskToBack(true) to send to background.

answered Oct 22 '13 at 23:40

ariel

253
5
9

score 1 · Answer 4 · answered May 06 '11 at 16:17

1

Well, you can't move back in the current stack without finishing the activity. Perhaps you could detect onBackPressed() and then launch the home intent in a new task:

public void onBackPressed() {
    Intent i = new Intent("android.intent.action.MAIN");
        i.addCategory("android.intent.category.HOME");
        i.addCategory("android.intent.category.DEFAULT");
        i.addCategory("android.intent.category.LAUNCHER");
        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(i);
    return;             
}

Let me know if that works.

answered May 06 '11 at 16:17

Femi

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i didnt try this one as the one-line solution from NeTe worked, but thanks nevertheless! – Cel May 06 '11 at 17:13
That is a nifty method: wasn't aware it was out there. – Femi May 06 '11 at 17:18

onBackPressed to hide Not destroy activity

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