Java 如何从文件的Uri id获取路径？

我试图用我的应用程序创建的视频制作一个图库。 当我点击其中一个缩略图时，我想将所选视频保存在我的首选项中

为了获得缩略图，我编写了以下代码：

public void addVidsToArray（） {

由于Uri id，我得到了Tumbnail图片。 现在我的问题是如何将其恢复到新文件中的正常路径以保存它

下面的代码是onClickListener，它应该将视频保存到首选项。 但是如果我将Uri添加到新文件中，则该文件不存在

我不明白

ga.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView parent, View v, int position, long id)
        {               
            String[] projection = { MediaStore.Video.Media._ID };
            String selection = MEDIA_DATA + " like ? ";
            String [] selectionArgs = new String[] {"%Bla%"};
            int columIndex;
            int id1;

            Cursor videoCursor = managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
                    projection, 
                    selection, 
                    selectionArgs, 
                    null);

            videoCursor.moveToFirst();

            if(videoCursor.getCount() >= 1)
            {
                while (videoCursor.moveToNext()) {
                    columIndex = videoCursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID) ;
                    id1 = videoCursor.getInt(columIndex);
                    daten.add(id1+"");                      
                }
            } 
            Log.v("vid id", ""+daten.get(position));

            int idData = Integer.parseInt(daten.get(position));

            saveVideo(idData);                              
        }
    });


}

public void saveVideo(int idData)
{
    String uriString = "content://media/external/video/media/" + idData;
    Uri uri = Uri.parse(uriString);
    File mVideoFile = new File(uriString);

    Log.v("testpfad", ""+ mVideoFile.getAbsolutePath() + " " + mVideoFile.getParentFile().getAbsolutePath() + " " + mVideoFile.exists());               
    mVideoFileLen = getDurationFromURI(uri);
    //setPreferences(mVideoFile.getAbsolutePath(), PICKED_VIDEO);
    //setPreferences(mVideoFileLen, VIDEO_LEN);     
    //startActivity(new Intent(this, Finished.class));  
}

---

最后，我需要借助Uri中的Id创建一个文件。

列MediaStore.Video.Media.DATA包含文件的路径。因此，我只需使用“where Id=iData”进行managedQuery？

ga.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView parent, View v, int position, long id)
        {               
            String[] projection = { MediaStore.Video.Media._ID };
            String selection = MEDIA_DATA + " like ? ";
            String [] selectionArgs = new String[] {"%Bla%"};
            int columIndex;
            int id1;

            Cursor videoCursor = managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
                    projection, 
                    selection, 
                    selectionArgs, 
                    null);

            videoCursor.moveToFirst();

            if(videoCursor.getCount() >= 1)
            {
                while (videoCursor.moveToNext()) {
                    columIndex = videoCursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID) ;
                    id1 = videoCursor.getInt(columIndex);
                    daten.add(id1+"");                      
                }
            } 
            Log.v("vid id", ""+daten.get(position));

            int idData = Integer.parseInt(daten.get(position));

            saveVideo(idData);                              
        }
    });


}

public void saveVideo(int idData)
{
    String uriString = "content://media/external/video/media/" + idData;
    Uri uri = Uri.parse(uriString);
    File mVideoFile = new File(uriString);

    Log.v("testpfad", ""+ mVideoFile.getAbsolutePath() + " " + mVideoFile.getParentFile().getAbsolutePath() + " " + mVideoFile.exists());               
    mVideoFileLen = getDurationFromURI(uri);
    //setPreferences(mVideoFile.getAbsolutePath(), PICKED_VIDEO);
    //setPreferences(mVideoFileLen, VIDEO_LEN);     
    //startActivity(new Intent(this, Finished.class));  
}