android – 使用新的存储访问框架(SAF)将视频录制到外部SD卡时出现IllegalStateException

2019年7月21日 200次阅读

我有以下方法,它适用于
Android 4.3或更早版本的内部存储和外部SD卡：

    public void Recorder_Prepare() {        
        recorder = new MediaRecorder();
        recorder.setPreviewDisplay(holder.getSurface());
        mCamera.unlock();
        recorder.setCamera(mCamera);
        recorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
        recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        recorder.setProfile(camcorderProfile);
        recorder.setVideoSize(ResolutionWidth, ResolutionHeight);

        File DirectoryExistCheck = new File(VideoFolderAbsolutePATH);
        if(!DirectoryExistCheck.exists()) {
            DirectoryExistCheck.mkdir();
        }

        String VideoPath = VideoFolderAbsolutePATH + separator + "Video.mp4"; 
        File NewVideoFile = new File(VideoPath);
        recorder.setOutputFile(NewVideoFile.getAbsolutePath());

        recorder.setVideoFrameRate(camcorderProfile.videoFrameRate);

          try {
              recorder.prepare();
          } 
          catch (IllegalStateException e) {
              Log.e("MyTag", "IllegalStateException : " + Log.getStackTraceString(e)); }        
          catch (IOException e) { 
              Log.e("MyTag", "IOException : " + Log.getStackTraceString(e)); } 

            recorder.start();
    }

........

........

现在我正在使用适用于Android 5.0的新存储访问框架选择一个文件夹：

    public void FolderSelection_Lollipop() {
        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
        startActivityForResult(intent, PICK_FOLDER_CODE_Lollipop);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent resultData) {  
        if(requestCode == PICK_FOLDER_CODE_Lollipop) {
            if(resultCode == RESULT_OK) {
                // Get Uri from Storage Access Framework.
                Uri Uri_Lollipop = resultData.getData();    
                VideoFolderAbsolutePATH = Uri_Lollipop.getPath();
                //also tried:
                VideoFolderAbsolutePATH = Uri_Lollipop.toString();

                // Persist access permissions.
                this.getContentResolver().takePersistableUriPermission(Uri_Lollipop,
                        Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
            }
        }
    }

Recorder_Prepare()方法没有用,因为它在Android 5.0上给我IllegalStateException 🙁

我也尝试按照此链接中的步骤操作：

Saving a video file with FileDesriptor

结果相同……

虽然我已经尝试在线进行研究,但新的SAF似乎对我来说是一团糟.

有谁知道解决方案或解决方案吗？

非常感谢你的帮助和善意的时间.

….

更新：2016年6月8日上午10:41

上面的链接确实有效.这是Recorder_Prepare()的一个错误,所以我只是移动了东西并且工作了.

最佳答案 首先,选择一个文件夹并使用新的Storage Access Framework API授予其权限：

public void FolderSelection_Lollipop() {
    Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
    startActivityForResult(intent, PICK_FOLDER_CODE_Lollipop);
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent resultData) {  
    if(requestCode == PICK_FOLDER_CODE_Lollipop) {
        if(resultCode == RESULT_OK) {
            // Get Uri from Storage Access Framework.
            Uri Uri_Lollipop = resultData.getData();    
            // Persist access permissions.
            this.getContentResolver().takePersistableUriPermission(Uri_Lollipop,
                    Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
        }
    }
}

……

……

public void Recorder_Prepare() {        
    recorder = new MediaRecorder();
    recorder.setPreviewDisplay(holder.getSurface());
    mCamera.unlock();
    recorder.setCamera(mCamera);
    recorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
    recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    recorder.setProfile(camcorderProfile);
    recorder.setVideoSize(ResolutionWidth, ResolutionHeight);
    recorder.setVideoFrameRate(camcorderProfile.videoFrameRate);
    createFile(“Video.mp4”);
}

private void createFile(String fileName) {
    String mimeType = "video/mp4";
    Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);

    intent.addCategory(Intent.CATEGORY_OPENABLE);

    intent.setType(mimeType);
    intent.putExtra(Intent.EXTRA_TITLE, fileName);
    startActivityForResult(intent, WRITE_REQUEST_CODE 
}

@Override
public void onActivityResult(int requestCode, int resultCode,Intent resultData) {

    if (requestCode == WRITE_REQUEST_CODE && resultCode == Activity.RESULT_OK) {
        if (resultData != null) {
            URI outputFileUri = resultData.getData();
            FileDescriptor outputFileDescriptor = getContentResolver().openFileDescriptor(outputFileUri, "w").getFileDescriptor()
            recorder.setOutputFile(outputFileDescriptor);

          try {
              recorder.prepare();
          } 
          catch (IllegalStateException e) {
              Log.e("MyTag", "IllegalStateException : " + Log.getStackTraceString(e)); }        
          catch (IOException e) { 
              Log.e("MyTag", "IOException : " + Log.getStackTraceString(e)); } 

            recorder.start();
        }
    }
}

它与我在问题中发布的方法没有太大区别.我只是移动了东西,它只是工作.我希望它可以帮助别人.
感谢Artem Pelenitsyn和CommonsWare的评论.

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