simulate onOptionsItemSelected inside method call

simulate onOptionsItemSelected inside method call

I have an ImageView inside a xml layout. The ImageView has an onClick method.
android:onClick="onHomeClicked"
When the user clicks my image, I want that to in turn call
onOptionsItemSelected inside the activity. How would I do that?
The following code gives null for homeMenuItem:
MenuItem homeMenuItem;
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
homeMenuItem = menu.findItem(android.R.id.home);
super.onPrepareOptionsMenu(menu);
return true;
}
public void onHomeClicked(View view) {
onOptionsItemSelected(homeMenuItem);
}