Android 9 Development Cookbook - Third Edition

How to do it...

We'll start by indicating the application's use of OpenGL in the Android Manifest, and then we'll add the OpenGL classes to the activity. Here are the steps:

1. Open the Android Manifest and add the following XML:

<uses-feature android:glEsVersion="0x00020000" android:required="true" /> 

2. Open MainActivity.java and add the following global variables:

private GLSurfaceView mGLSurfaceView;

3. Add the following inner class to the MainActivity class:

class GLRenderer implements GLSurfaceView.Renderer {    public void onSurfaceCreated(GL10 unused, EGLConfig config) {        GLES20.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);    }    public void onDrawFrame(GL10 unused) {        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);    }    public void onSurfaceChanged(GL10 unused ...