Treat Android action-bar Home button as "Back"

homeAsBack.java

	@Override
	public boolean onOptionsItemSelected(final MenuItem item)
	{
		final int itemId = item.getItemId();
		switch (itemId)
		{
		case android.R.id.home:
			// Action bar home button: go back
			finish();
			return true;
		}
		
		return super.onOptionsItemSelected(item);
	}