Android Fragment Activity Communication
ChangeColorFragment.java
public class ChangeColorFragment extends Fragment {
private OnChangeColorFragmentInteractionListener mListener;
RadioGroup radioGroupColors;
public ChangeColorFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view= inflater.inflate(R.layout.fragment_change_color, container, false);
radioGroupColors= (RadioGroup) view.findViewById(R.id.radioGroupColors);
radioGroupColors.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
onColorChanged(checkedId);
}
});
return view;
}
public void onColorChanged(int id) {
if (mListener != null) {
mListener.onChangeColorFragmentInteraction(id);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnChangeColorFragmentInteractionListener) {
mListener = (OnChangeColorFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnChangeColorFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public interface OnChangeColorFragmentInteractionListener {
void onChangeColorFragmentInteraction(int id);
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity implements ChangeColorFragment.OnChangeColorFragmentInteractionListener{
RelativeLayout layout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
layout= (RelativeLayout) findViewById(R.id.activity_main);
FragmentTransaction transaction= getSupportFragmentManager().beginTransaction();
ChangeColorFragment changeColorFragment=new ChangeColorFragment();
transaction.add(R.id.relativeLayoutFragmentContainer,changeColorFragment);
transaction.commit();
}
@Override
public void onChangeColorFragmentInteraction(int id) {
switch (id)
{
case R.id.radioButtonRed:
layout.setBackgroundColor(getResources().getColor(R.color.red));
break;
case R.id.radioButtonBlue:
layout.setBackgroundColor(getResources().getColor(R.color.blue));
break;
}
}
}
References
https://github.com/mhdr/AndroidSamples/tree/master/031
