android – onSurfaceCreated()在每次方向更改时调用

public class GL20Renderer implements GLSurfaceView.Renderer {
    private static GL20Renderer mInstance = new GL20Renderer();
    private GL20Renderer() {}
    public static GL20Renderer geTinstance() {
        return mInstance;
    }

    @Override
    public void onDrawFrame(GL10 gl) {
        Log.e("App","onDrawFrame()");
    }
    @Override
    public void onSurfaceChanged(GL10 gl,int width,int height) {
        Log.e("App","onSurfaceChanged()");
    }
    @Override
    public void onSurfaceCreated(GL10 gl,EGLConfig config) {
        Log.e("App","onSurfaceCreated()");
    }

}

此类在MainActivity中实现：

public class MainActivity extends Activity {
    private GLSurfaceView mGLView;

    @Override
    protected void onCreate(Bundle savedInstanceStatE) {
        super.onCreate(savedInstanceStatE);

        requestWindowFeature(Window.FEATURE_NO_titlE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

        // Create a GLSurfaceView instance and set it as the ContentView for this Activity
        mGLView = new GL20SurfaceView(this);
        setContentView(mGLView);
    }

    @Override
    protected void onPause() {
        super.onPause();
        mGLView.onPause();
    }

    @Override
    protected void onResume() {
        super.onResume();
        mGLView.onResume();
    }

}

GL20SurfaceView是：

public class GL20SurfaceView extends GLSurfaceView {
    public GL20SurfaceView(Context context) {
        super(context);

        // Create an OpenGL ES 2.0 context.
        setEGLContextClientVersion(2);

        // Set the Renderer for drawing on the GLSurfaceView
        setRenderer(GL20Renderer.geTinstance());
    }
}

你可以看到非常简单.
当我现在启动App时,正确调用onSurfaceCreated()方法,然后调用onSurfaceChanged().

现在的问题是：每当设备方向改变时,我会再次调用onSurfaceCreated(),然后调用onSurfaceChanged().

根据我的理解,只要需要创建新表面,就会调用onSurfaceCreated()方法.我的问题是：每当我改变设备方向时,为什么会这样做？为了调整视口,仅触发onSurfaceChanged()调用是不是足够了？

请注意,更改方向时,我不会让设备进入睡眠状态.