Proper way to handle action bar up button?

Question

I use ActionBarSherlock (although I don\'t think it matters).

I have a Main activity and an About activity. I want the About activity to show the back-arrow by its l

Answer 1

In your onCreate(Bundle savedInstanceState), do

ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);

Then in your onOptionsItemSelected(MenuItem item), do

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            // go to previous screen when app icon in action bar is clicked
            Intent intent = new Intent(this, PreviousActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(intent);
            return true;
    }
    return super.onOptionsItemSelected(item);
}