Android: What is the proper way to override onCreateView?

Question

My current issue is that I am trying to trigger an Animator to transition between two Activities. My goal is to create a circular reveal transition from one Activity to another.

I am starting to get this error: "Cannot start this animator on a detached view!"

I was looking around Stack Overflow and found this: Cannot start this animator on a detached view! reveal effect

One explanation seems to be that the view for the second Activity has not yet been inflated which is why the Animator is not able to start.

The person in the thread used this as the solution:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    // Inflate the layout for this fragment
    final View view = inflater.inflate(R.layout.fragment_map_list, container, false);
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        view.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
            @TargetApi(Build.VERSION_CODES.LOLLIPOP)
            @Override
            public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
                v.removeOnLayoutChangeListener(this);
                toggleInformationView(view);
            }
        });
    }
    return view;
}

However, I'm a little bit confused about what's happening here. It seems that he is also inflating the layout for the Activity. If that's the case, should I not call:

setContentView(R.layout.activity_bnew_account);

in the onCreate method of the Activity? Should I be using the layout inflater in the overridden onCreateView to inflate the activity layout? Thanks for any advice on how to solve this problem.

score 1 · Answer 1 · answered Jul 20 '15 at 21:48

onCreateView is a method on Fragments, see the documentation here

There is no equivalent for activities, setContentView will call inflate on your layout there.

The rough equivalent for that code for activities would be (where R.id.rooViewId is the ID of your root view in your activity layout):

@Override 
public View onCreate (Bundle savedInstanceState) {
    setContentView(R.layout.activity_bnew_account);
    // Inflate the layout for this fragment
    final View view = findViewById(r.id.rootViewId);
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        view.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
            @TargetApi(Build.VERSION_CODES.LOLLIPOP)
            @Override
            public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
                v.removeOnLayoutChangeListener(this);
                toggleInformationView(view);
            }
        });
    }
}

Android: What is the proper way to override onCreateView?

1 Answers1