android - 从安卓图库中选择缩略图

Question

我知道如何从android中的图库获取照片

Intent gallery = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(gallery, PHOTO_REQUEST_CODE);

但是我该如何具体选择缩略图呢？

赏金原因:

我已经在 Get thumbnail Uri/path of the image stored in sd card + android 尝试了这两种解决方案.他们不为我工作。我不知道如何从数据中获取selectedImageUri，它是long类型

 onActivityResult(int requestCode, int resultCode, Intent data)

Answer 1

String fn = ...; // file name
ContentResolver cr = ctx.getContentResolver();
Cursor c = cr.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
           new String[]{
              BaseColumns._ID
           }, MediaColumns.DATA + "=?", new String[]{ fn }, null);
     if(c!=null) {
        try{
           if(c.moveToNext()) {
              long id = c.getLong(0);
              Bitmap thumbnail = MediaStore.Images.Thumbnails.getThumbnail(cr, id, MediaStore.Images.Thumbnails.MINI_KIND, null);
           }
        }finally{
           c.close();
        }
     }