Using fragments with NativeActivity

Question

I have a fully working C++/OpenGL engine that I ported over to Android using their supplied NativeActivity. But I'm now tasked with integrating it to an older project which was 100% Java, with plenty of Fragments.

My question is simple : Is it possible to show/use a Fragment over a NativeActivity?

Note: I'm using a custom Java class that derives from NativeActivity to be able to catch some events that are not available to the the C++ layer. So the proposed solution can be either in Java or C++.

I have tried sample code from various source to show the fragment from Java :

public class CustomNativeActivity extends NativeActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        startFragment();
    }

    public void startFragment() {
        TestNativeFragment fragment = new TestNativeFragment();
        getFragmentManager().beginTransaction().replace(android.R.id.content, fragment).commit();
    }
}

No crash, no message in the console after the fragment transaction. Just my OpenGL but no signs of my fragment.

Thanks for any help!

I have tried setting the content view prior to showing the fragment, but no luck on this. — dZbear, Jan 15 '18 at 14:07

score 1 · Accepted Answer · answered Jan 17 '18 at 13:43

1

Since this project is highly reliant on Java and Fragments, I decided to ditch the NativeActivity approach and instead add a GLSurfaceView in my layout file, and from there, call in the c++ engine's functions via JNI. If anyone is interested in the code please let me know. Thanks for the suggestions.

answered Jan 17 '18 at 13:43

dZbear

31
5

1

This was the right approach. `NativeActivity.onCreate(..)` calls `getWindow().takeSurface(..)`, which "takes" the surface away from the Android UI toolkit and prevents any of the `android.view` stuff from drawing in your window. – j__m Dec 11 '18 at 19:17
@dZbear I would be interested in the code if you still have it available – William Feb 12 '23 at 02:08

Using fragments with NativeActivity

1 Answers1