draw.java

public void draw(final int programHandle) {
        final int positionHandle = GLES20.glGetAttribLocation(programHandle, "vertPos");
        final int colorHandle    = GLES20.glGetUniformLocation(programHandle, "vertColor");

        GLES20.glEnableVertexAttribArray(positionHandle);
        GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false, 12, vertexBuffer);

        GLES20.glEnableVertexAttribArray(colorHandle);
        GLES20.glVertexAttribPointer(colorHandle, 4, GLES20.GL_FLOAT, false, 16, colorBuffer);

        GLES20.glDrawElements(GLES20.GL_TRIANGLES, vertCount, GLES20.GL_UNSIGNED_SHORT, indexBuffer);

        GLES20.glDisableVertexAttribArray(positionHandle);
        GLES20.glDisableVertexAttribArray(colorHandle);
    }