I'm writing an Information Visualization API for Android and ran into a problem trying to place two units of a custom GLSurfaceView into a Layout. The Custom GLSurfaceView at this point is simply an extension of the GLSurfaceView to eliminate possible faults caused by custom methods.
When I have both components added in layout and start the application it runs. But nothing is drawn, seems like it enters an infinite loop. because debug messages inside the Renderers are printed into the LogCat. However, It works perfectly fine if I only use one of the custom GLSurfaceView components.
I read that there is a problem using GLSurfaceView in multiple Activities and I suppose it also applies when using two of those components at the same time. I have tried the workaround posted here but cant seem to get it to work either.
I would appreciate any help. I choose to use openGL for the better performance, but if I cant use multiple components at once I guess I'll have to use Canvas instead.
The manifest looks as follows:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:text="@string/hello" android:id="@+id/TextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<com.syntronic.vtadlib.VisualizationView android:id="@+id/glview"
android:layout_width="fill_parent" android:layout_height="300px" />
<TextView android:text="@string/hello" android:id="@+id/TextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.syntronic.vtadlib.VisualizationView android:id="@+id/glview2"
android:layout_width="fill_parent" android:layout_height="fill_parent" />
</LinearLayout>
</LinearLayout>
From the Activity the code is like this:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mSurfaceView = (VisualizationView) findViewById(R.id.glview);
mSurfaceView2 = (VisualizationView) findViewById(R.id.glview2);
//Enables debug flags for Errors
//mSurfaceView.setDebugFlags(GLSurfaceView.DEBUG_CHECK_GL_ERROR);
//mSurfaceView2.setDebugFlags(GLSurfaceView.DEBUG_CHECK_GL_ERROR);
mSurfaceView.setRenderer(new CoordinateSystemRenderer());
mSurfaceView2.setRenderer(new CoordinateSystemRenderer());
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
mSurfaceView.onPause();
mSurfaceView2.onPause();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
mSurfaceView.onResume();
mSurfaceView2.onResume();
}
Am I missing something obvious? Or can someone explain why it doesn't work?
You may may want to investigate overlaying/under-laying your models in the 'correct' area of the screen using a full screen GLSurfaceView. You may want to put together some sort of layout framework to make this simpler, or perhaps using multiple Viewports on the full screen GLSurfaceView. Haven't tried these in OpenGL ES, but generally either of these methods would be the used to render multiple views of the same or even many different models in a single application on a desktop system rather than using multiple GLContexts (if that is what is going on behind the scenes here).