How to catch event with hardware back button on android?

Question

How to catch event with hardware back button on android ? I need to supress user to go back and I when click on back button on phone to show message and not to go on previous activity. How to do that ?

Possible duplicate of [Disable back button in android](http://stackoverflow.com/questions/4779954/disable-back-button-in-android) — Ricardo A., Nov 30 '16 at 19:17

score 71 · Answer 1 · answered Nov 11 '11 at 13:45

71

you can do by this

override the onBackPressed() method into your Activity like this way

public void onBackPressed(){
     // do something here and don't write super.onBackPressed()
}

override the onKeyDown() method

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    switch(keyCode){
    case KeyEvent.KEYCODE_BACK:
        // do something here 
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

answered Nov 11 '11 at 13:45

Pratik

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2

Is it really necessary to override `onKeyDown()` too? When the back key is pressed, won't `onBackPressed()` be called? – LarsH Aug 16 '17 at 10:24
1

@LarsH in case you are still wondering: No. The first solution is for API Level 5 (Android 2.0) and above. The second solution is for API Level < 5. Referring to [this comment/answer](https://stackoverflow.com/questions/5312334/how-to-handle-back-button-in-activity#comment5992484_5312391) – Alex Mar 05 '19 at 14:27

score 10 · Answer 2 · edited May 23 '17 at 12:10

10

Override the method onBackPressed() in whatever Activity you want to create a different behaviour to the back button.

These question are equal to yours (and could have been found by a simple search):

how to disable back button in android

Disable back button in android

edited May 23 '17 at 12:10

Community

1
1

answered Nov 11 '11 at 13:36

kaspermoerch

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score 2 · Answer 3 · edited Mar 05 '18 at 17:37

2

You can suppress user "back" action with onKeyDown() in your activity like this:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
    if ((keyCode == KeyEvent.KEYCODE_BACK))
    {
        //do actions like show message
        return false;
    }
    return super.onKeyDown(keyCode, event);
}

edited Mar 05 '18 at 17:37

Paul Roub

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answered Mar 05 '18 at 17:22

Guillermo Gonzalez

51
3

How to catch event with hardware back button on android?

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