android - How to handle "Up" button?

Question

How to handle "Up" button (SDK version 11+)? I am referring to the one at the top of screen, that holds the application icon.

In Android Design articles it was named as "Up button", but I didn't found it (or similar) in KeyEvent fields.

Answer 1

Implement onOptionsItemSelected() and watch for android.R.id.home "menu" events, as is described in the documentation.

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            // do something useful
            return(true);
    }

    return(super.onOptionsItemSelected(item));
}