小编rka*_*kap的帖子

我浏览了http://developer.android.com/guide/topics/media/camera.html#custom-camera 并尝试添加 Camera.PreviewCallback 但它没有被调用。哪些方法/类依赖于 PreviewCallback 触发？

public class MainActivity extends Activity {

    private Camera mCamera;
    private CameraPreview mPreview;
    private final static String TAG = "Main-Activity";

    private Camera.PreviewCallback countFrameCallback = new Camera.PreviewCallback() {
        @Override
        public void onPreviewFrame(byte[] bytes, Camera camera) {
            Log.d(TAG, "In frame callback");
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Create an instance of Camera
        mCamera = getCameraInstance();

        // Create our Preview view and set it as the content of our activity.
        mPreview = …