在片段中创建浮动操作按钮

Question

I just wanted to build a floating action bar in one of the fragments but unfortunately, when I run the app it crashes.

 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate( savedInstanceState ); add_button =(FloatingActionButton)getView().findViewById(R.id.add_button); add_giftcard =(FloatingActionButton)getView().findViewById(R.id.add_giftcard); add_flight =(FloatingActionButton)getView().findViewById(R.id.add_flight); //animations fabOpen = AnimationUtils.loadAnimation( getActivity(), R.anim.fab_open); fabClose = AnimationUtils.loadAnimation( getActivity(), R.anim.fab_close); rotateForward = AnimationUtils.loadAnimation( getActivity(), R.anim.rotate_forward); rotateBackward = AnimationUtils.loadAnimation( getActivity(), R.anim.rotate_backward);

Answer 1

According to the fragment lifecycle, the view should be initialized within the onCreateView() callback. Use the below snippet.

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.your_fragment_view, container, false);

add_button =(FloatingActionButton)view.findViewById(R.id.add_button);
        add_giftcard =(FloatingActionButton)view.findViewById(R.id.add_giftcard);
        add_flight =(FloatingActionButton)view.findViewById(R.id.add_flight);
}