如何从内部存储读取视频数据 - Android studio

Question

我得到了这个代码，用户可以在其中从图库中选择视频或拍摄视频：

    private void showPictureDialog(){
            AlertDialog.Builder pictureDialog = new AlertDialog.Builder(this);
            pictureDialog.setTitle("Select Action");

//从图库中挑选或拍摄视频

            String[] pictureDialogItems = {
                    "Select video from gallery",
                    "Record video from camera" };
            pictureDialog.setItems(pictureDialogItems,
                    new DialogInterface.OnClickListener() {
                        @Override

//用户点击其中一个选项

                        public void onClick(DialogInterface dialog, int which) {
                            switch (which) {
                                case 0:
                                    chooseVideoFromGallary();
                                    break;
                                case 1:
                                    takeVideoFromCamera();
                                    break;
                            }
                        }
                    });
            pictureDialog.show();
        }

//intent 根据用户的选择

        public void chooseVideoFromGallary() {
            Intent galleryIntent = new Intent(Intent.ACTION_PICK,
                    android.provider.MediaStore.Video.Media.EXTERNAL_CONTENT_URI);
    
            startActivityForResult(galleryIntent, GALLERY);
        }
    
        private void takeVideoFromCamera() {
            Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
            startActivityForResult(intent, CAMERA);
        }

// 然后，根据活动结果，它会执行我需要的所有操作，包括查找 uri 和路径。一切正常，我可以在 videoView 上看到拍摄/挑选的视频。

        @Override
        public void onActivityResult(int requestCode, int resultCode, Intent data) {
    
            Log.d("result",""+resultCode);
            super.onActivityResult(requestCode, resultCode, data);
            if (resultCode == this.RESULT_CANCELED) {
                Log.d("what","cancle");
                return;
            }
            if (requestCode == GALLERY) {
                Log.d("what","gale");
                if (data != null) {
                    Uri contentURI = data.getData();
                    String selectedVideoPath = getPath(contentURI);
                    Log.d("path",selectedVideoPath);
                    saveVideoToInternalStorage(selectedVideoPath);
                    File currentFile = new File(selectedVideoPath);
                    String currentFileS = currentFile.toString();
                   
                    videoView.setVideoURI(contentURI);
                    videoView.requestFocus();
                    videoView.start();
                     
                }
} else if (requestCode == CAMERA) {

            Uri contentURI = data.getData();
            String recordedVideoPath = getPath(contentURI);
            Log.d("frrr",recordedVideoPath);
            saveVideoToInternalStorage(recordedVideoPath);
            videoView.setVideoURI(contentURI);
            videoView.requestFocus();
            videoView.start();
        }
    }

我需要使用选定的视频数据获取字节数组。我不确定如何。 Tnx