如何使用 MediaStore 指定特定的图库文件夹

Question

I tried this code.

public static void openGallery(Context context) {
       String bucketId = "";
       final String[] projection = new String[] {"DISTINCT " + MediaStore.Images.Media.BUCKET_DISPLAY_NAME + ", " + MediaStore.Images.Media.BUCKET_ID};
       final Cursor cur = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, null, null, null);
       while (cur != null && cur.moveToNext()) {
           final String bucketName = cur.getString((cur.getColumnIndex(MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME)));
           if (bucketName.equals("Your_dir_name")) {
               bucketId = cur.getString((cur.getColumnIndex(MediaStore.Images.ImageColumns.BUCKET_ID)));
               break;
           }
       }
       Uri mediaUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

       if (bucketId.length() > 0) {
           mediaUri = mediaUri.buildUpon()
                   .authority("media")
                   .appendQueryParameter("bucketId", bucketId)
                   .build();
       }
       if(cur != null){
           cur.close();
       }
       Intent intent = new Intent(Intent.ACTION_VIEW, mediaUri);
       context.startActivity(intent);
   }

But I failed to open the gallery specific folder, but the gallery home screen appears with 'file not supported' Toast. Is there any way I can solve this problem?

Answer 1

You can't set initial path to specific folder when working with files stored in MediaStore .

However, you can use DocumentsContract.EXTRA_INITIAL_URI when working with DocumentFile , so you can set initial path when user wants to select files from Storage Access Framework (SAF):

Uri initialUri = DocumentFileCompat.createDocumentUri(DocumentFileCompat.PRIMARY, "DCIM")
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
        .putExtra(DocumentsContract.EXTRA_INITIAL_URI, initialUri)

DocumentFileCompat.createDocumentUri() helps you constructing the initial URI. You can get DocumentFileCompat from SimpleStorage .