Android Back Button doesn't work at all

Question

I have a Fragment Activity hosting a Map and ListActivity. I wanna put a method when the back button is pressed on the Activity, but it seems it doesn't work at all. My Log isn't even printed on the Stacktrace. I have no idea what's wrong actually.

Here's the method:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK ) {
           Log.e("Test","Back Button Clicked");

            this.finish();
            return true;
    }
    return super.onKeyDown(keyCode, event);
}

What if you put Log.d("Test","KeyCode " +keyCode); as the first line of your method? — Xi 张熹, May 25 '12 at 10:51
May be the problem with your code is your parent activity gets the instance and your current activity doesnt get instance of Backpressed event... You can print the backpressed event in your parent activt and then check... — Rakesh Gondaliya, May 25 '12 at 10:54
@RakeshGondaliya: so what would be your suggestion? putting the same keyDown method on all the children activities? — hectichavana, May 25 '12 at 10:56
http://stackoverflow.com/questions/5448653/how-to-implement-onbackpressed-in-android-fragments http://stackoverflow.com/questions/7992216/android-fragment-handle-back-button-press — Shankar Agarwal, May 25 '12 at 11:00

score 2 · Answer 1 · edited May 26 '12 at 09:08

2

@Override 
public void onBackPressed(){ 
  Toast.makeText(getBaseContext(), "back button pressed", Toast.LENGTH_SHORT).show(); 
  Log.e("Test","Back Button Clicked");
  this.finish();
}

edited May 26 '12 at 09:08

PrincessLeiha

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answered May 25 '12 at 10:48

hacker

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score 2 · Accepted Answer · edited May 23 '17 at 10:27

2

If you wanted that sort of functionality you would need to override it in your activity, and then add a YourBackPressed interface to all your fragments, which you call on the relevant fragment whenever the back button is pressed.

Copied from how to implement onBackPressed() in Android Fragments?

edited May 23 '17 at 10:27

Community

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answered May 25 '12 at 11:38

Shankar Agarwal

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score 0 · Answer 3 · answered May 25 '12 at 10:51

0

Maybe try to remove 'if' statement and see what happens?

answered May 25 '12 at 10:51

Doszi89

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score 0 · Answer 4 · answered May 25 '12 at 10:59

try it , it may be works as per your need,

public boolean onKeyDown(int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_BACK) {
                Log.e("Test","Back Button Clicked");
    Intent backpage = new Intent(CurrentActivity.this,BackPageActivity.cls);
                    startActivity(backpage);
               CurrentActivity.this.finish();

                return true;
            }
            return super.onKeyDown(keyCode, event);    
        }

score 0 · Answer 5 · edited May 23 '17 at 10:27

0

Problem solved:

How to implement onBackPressed() in Fragments?

In order to use the back button on a Fragment, you need to declare the onKeyDown/onBackPressed() method on your children Activities as well.

edited May 23 '17 at 10:27

Community

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answered May 25 '12 at 11:06

hectichavana

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Android Back Button doesn't work at all

5 Answers5