When toolbar back button is pressed

Question

how can I create a condition on my android app where When I pressed the back button on the toolbar some code will happening.

I tried this but it doesnt work.

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Answer 1

try this :

@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
    case android.R.id.home:
        // this takes the user 'back', as if they pressed the left-facing    

      triangle icon on the main android toolbar.
        // if this doesn't work as desired, another possibility is to call   

        `finish()` here.
        getActivity().onBackPressed();
        return true;
    default:
        return super.onOptionsItemSelected(item);
}
}