How do you control what the BACK button does?

Question

I have an application that when a button is clicked it changes the content view, but when I press the back button, it closes the activity. How do I change what the back button does. In this case it will be the back button changing the layout again.

Thanks

score 8 · Accepted Answer · edited Jul 23 '12 at 11:08

8

You must override onBackPressed() in your activity.

@Override
public void onBackPressed() {
    //your code when back button pressed
}

The onBackPressed method is called when the back Button is pressed, for that, you must change the content of this method by overriding it.

edited Jul 23 '12 at 11:08

Bill the Lizard

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answered Jul 23 '12 at 10:12

Nermeen

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score 3 · Answer 2 · edited May 23 '17 at 12:02

3

Solved here: Override back button to act like home button

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        //Do what you want here
        moveTaskToBack(true);
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

edited May 23 '17 at 12:02

Community

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answered Jul 23 '12 at 10:15

RobGThai

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score 2 · Answer 3 · answered Jul 23 '12 at 10:13

2

You can override onBackpressed:

@Override
public void onBackPressed() {
    // Do your stuff....
}

answered Jul 23 '12 at 10:13

Iñigo

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score 0 · Answer 4 · answered May 23 '19 at 08:01

0

The new recommended way is to use OnBackPressedCallback API, which is more flexible than old onBackPressed() method and may be used not only from Activity or Fragment

See more details in the official guide and API reference

answered May 23 '19 at 08:01

gildor

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How do you control what the BACK button does?

4 Answers4