如何在onActivityResult回调中从PDF chooser intent library获取pdfUri文件路径?

为了解决问题,我正在尝试执行以下操作:

1. 我将使代码通用,我得到的解决方案,对于许多其他文件格式,而不是PDF:

   private String saveFileFromUri(Uri pdfUri){
       try{
           InputStream is=
           baseActivity.getContentResolver().openInputStream(pdfUri);
           byte[]bytesArray=new byte[is.available()];
           int read=is.read(bytesArray);
       //write to sdcard
   
       File dir=new File(Environment.getExternalStorageDirectory(),"/PRJ");
       boolean mkdirs=dir.mkdirs();
       File myPdf=new 
       File(Environment.getExternalStorageDirectory(),"/PRJ/myPdf.pdf");
       if(read==-1&&mkdirs){
   
       }
       FileOutputStream fos=new FileOutputStream(myPdf.getPath());
       fos.write(bytesArray);
       fos.close();
       //            System.out.println(fileString);
       return myPdf.getPath();
   }catch(FileNotFoundException e){
       e.printStackTrace();
   }catch(IOException e){
       e.printStackTrace();
   }
   return null;}
   

2. 为了能够释放相机资源,我将使用基于表面视图的相机活动,允许这样做。下面是代码的一部分:

释放相机资源:

    @Override
public void onPause() 
{
    super.onPause();

        if (mCamera != null){
            //              mCamera.setPreviewCallback(null);
            mPreview.getHolder().removeCallback(mPreview);
            releaseMediaRecorder();
            mCamera.release();        // release the camera for other applications
            mCamera = null;

        }
    }

    @Override
    public void onResume() {
        super.onResume();
        if (mCamera == null) {
            mCamera=getCameraInstance();
            mPreview = new CameraPreview(this.getActivity(), mCamera);
            preview.addView(mPreview);
        }
    }