simulate up when back button is pressed

Question

I'm working on an android app and recently, I discovered that the default back button onBackPressed() produces a back behaviour, while the getSupportActionBar().setDisplayHomeAsUpEnabled(true) produces an up behaviour. And the two have significant differences.

I was wondering if I can simulate the up behaviour when I press the hardware back button, so that it navigates up instead of back . Thanks.

Answer 1

You can do this.

@Override
public void onBackPressed() {
    NavUtils.navigateUpFromSameTask(this);
}

Answer 2

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);
}

Hope it helps you

Answer 3

You can do this

Overide onOptionsItems Selected

Create a switch case of android.R.id.home Call method onBackPressed();

here is the code

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                onBackPressed();

            default:
                return super.onOptionsItemSelected(item);
        }
    }