Let's dive straight into the code. As we will see, this GameObject will have a lot in common with the GameObject class from the previous project. The most significant difference will be that this latest GameObject will of course draw itself using a handle to the GL program, primitive (vertex) data from a child class, and the viewport matrix contained in viewportMatrix.

Create a new class, call it GameObject, and enter these import statements, noting again that that some of them are static:

import android.graphics.PointF;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import static android.opengl.GLES20.GL_FLOAT;
import static android.opengl.GLES20.GL_LINES;
import static android.opengl.GLES20.GL_POINTS;
import static android.opengl.GLES20.GL_TRIANGLES;
import static android.opengl.GLES20.glDrawArrays;
import static android.opengl.GLES20.glEnableVertexAttribArray;
import static android.opengl.GLES20.glGetAttribLocation...