override onOptionsItemSelected() :
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// do your stuff here, eg: finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
For a list of Android's id
s :http://developer.android.com/reference/android/R.id.html#home