如何在运行时更改JavaCameraView的maxFrameSize

Question

我有一个带有OpenCV的Android应用程序，应该能够在运行时更改JavaCameraView的帧大小。由于对传递帧的大量处理，我在应用程序启动时将帧的分辨率设置为320 x 280。我是这样做的：

protected void onCreate(Bundle savedInstanceState) {
    cameraView = (JavaCameraView) findViewById(R.id.cam_view);
    cameraView.setMaxFrameSize(320, 280);
    cameraView.setCvCameraViewListener(this);

我创建了一个单选按钮组，用于选择画面的分辨率。这是我的代码：

resolutionChange = new Dialog(this);
    resolutionChange.requestWindowFeature(Window.FEATURE_NO_TITLE);
    resolutionChange.setContentView(com.finarx.opencv.camera.R.layout.resdialog);

    RadioGroup resChange = (RadioGroup) resolutionChange.findViewById(com.finarx.opencv.camera.R.id.resChange);
    resChange.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(RadioGroup group,
                int checkedId) {
            if (checkedId == com.finarx.opencv.camera.R.id.lowest) {
                cameraView.setMaxFrameSize(320, 280);
                resolutionChange.dismiss();
            } else if (checkedId == com.finarx.opencv.camera.R.id.low) {
                cameraView.setMaxFrameSize(480, 320);
                resolutionChange.dismiss();
            } else if (checkedId == com.finarx.opencv.camera.R.id.vga) {
                cameraView.setMaxFrameSize(640, 480);
                resolutionChange.dismiss();
            } else if (checkedId == com.finarx.opencv.camera.R.id.higher) {
                cameraView.setMaxFrameSize(800, 600);
                resolutionChange.dismiss();
            } else if (checkedId == com.finarx.opencv.camera.R.id.highest) {
                cameraView.setMaxFrameSize(1280, 720);
                resolutionChange.dismiss();
            }
        }
    });

实际上，当我选择其他分辨率时，帧的分辨率并没有改变。当然，我也尝试重新初始化cameraView对象。我错过了什么吗？

- Raistlin

Answer 1

好的，最终我自己找到了解决方法。实际上非常简单，但有些地方我没有考虑到。我只需要重新启动我的cameraView对象即可。以下是我的代码:

@Override
        public void onCheckedChanged(RadioGroup group,
                int checkedId) {
            if (checkedId == com.finarx.opencv.camera.R.id.lowest) {
                cameraView.setMaxFrameSize(320, 280);
                cameraView.disableView();
                cameraView.enableView();
                resolutionChange.dismiss();
            } else if (checkedId == com.finarx.opencv.camera.R.id.low) {
                cameraView.setMaxFrameSize(480, 320);
                cameraView.disableView();
                cameraView.enableView();
                resolutionChange.dismiss();
            } else if (checkedId == com.finarx.opencv.camera.R.id.vga) {
                cameraView.setMaxFrameSize(640, 480);
                cameraView.disableView();
                cameraView.enableView();
                resolutionChange.dismiss();
            } else if (checkedId == com.finarx.opencv.camera.R.id.higher) {
                cameraView.setMaxFrameSize(800, 600);
                cameraView.disableView();
                cameraView.enableView();
                resolutionChange.dismiss();
            } else if (checkedId == com.finarx.opencv.camera.R.id.highest) {
                cameraView.setMaxFrameSize(1280, 720);
                cameraView.disableView();
                cameraView.enableView();
                resolutionChange.dismiss();
            }
        }

- Raistlin