如何将GLSurfaceView渲染保存到文件中？

public class MyRenderer implements GLSurfaceView.Renderer {
    private int width;
    private int height;
    private int[] pixels;
    private Bitmap bitmap;

    @Override
    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
        // 初始化OpenGL ES相关操作
    }

    @Override
    public void onSurfaceChanged(GL10 gl, int width, int height) {
        this.width = width;
        this.height = height;
        pixels = new int[width * height];
        bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    }

    @Override
    public void onDrawFrame(GL10 gl) {
        // 渲染OpenGL ES场景

        // 读取GLSurfaceView的像素数据到pixels数组中
        GLES20.glReadPixels(0, 0, width, height, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, IntBuffer.wrap(pixels));

        // 将像素数据保存到Bitmap对象中
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);

        // 将Bitmap对象保存为文件
        File file = new File(Environment.getExternalStorageDirectory(), "rendered_image.jpg");
        try {
            FileOutputStream fos = new FileOutputStream(file);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}