同一片段中的ListView和自定义SurfaceView

Question

I'm writing a custom SurfaceView implementation:

CustomSurfaceView.java :

public class CustomSurfaceView extends SurfaceView {
  private void init() { }

  // ...
}

I want to call CustomSurfaceView from a fragment, myFragment . Every example I can find on the web does this by

class myFragment extends Fragment {
  // ...

  public View onCreateView() {
    return new CustomSurfaceView(getActivity());
  }
}

The problem with this approach is that I also have a ListView, myList , in myFragment . It works like this:

my_fragment.xml :

<LinearLayout>
  <ListView id="@+id/my_list"/>
  <SurfaceView id="@+id/custom_surface_view"/>
</LinearLayout>

myFragment.java :

class myFragment extends Fragment {
  // ...

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

    myList = (ListView) view.findViewById(R.id.my_list);

    return view;
  }
}

That configuration, without the CustomSurfaceView , works fine.

Then, I tried adding after myList = ... :

customSurfaceView = (CustomSurfaceView) view.findViewById(R.id.custom_surface_view);

which results in an Unexpected cast to CustomSurfaceView: layout tag was SurfaceView .

If in my xml layout file I change <SurfaceView/> to <com.example.CustomSurfaceView/> , I get a crash on runtime ( Binary XML : Error inflating class com.example.CustomSurfaceView ).

So my question is this: what am I doing wrong, and which is the proper, working way to include both a ListView and CustomSurfaceView in the same myFragment ?

Answer 1

The problem was that I hadn't defined by constructors to the proper specification.

Adding this code to CustomSurfaceView.java removed the error inflating crash:

public CustomSurfaceView(Context context, AttributeSet attrs) {
  super(context, attrs);
}