Question

我的问题是我从外部存储器中删除了图像，并且黑色占位符仍然指的是删除的图像位置。

这是代码，请帮我把它拿出来。

提前致谢。

 String canonicalPath;
        try {
            canonicalPath = file.getCanonicalPath();
        } catch (IOException e) {
            canonicalPath = file.getAbsolutePath();
        }
        final Uri uri = MediaStore.Files.getContentUri("external");
        final int result = contentResolver.delete(uri,
                MediaStore.Files.FileColumns.DATA + "=?", new String[]{canonicalPath});
        if (result == 0) {
            final String absolutePath = file.getAbsolutePath();
            if (!absolutePath.equals(canonicalPath)) {
                contentResolver.delete(uri,
                        MediaStore.Files.FileColumns.DATA + "=?", new String[]{absolutePath});
            }
        }

Answer 1

我一直将此功能用于我的音乐应用，但也适用于画廊。首先找到所需条目的_id，然后构建正确的uri以提交给删除查询。

public void deleteFromMediaStore(String pathToDelete, Context context) {
    ContentResolver contentResolver = context.getContentResolver();
    if (contentResolver != null) {
        Cursor matchingIndex = contentResolver.query(Media.EXTERNAL_CONTENT_URI, new String[]{"_id", "_data"}, "_data=?", new String[]{pathToDelete}, null);

        if(matchingIndex != null && matchingIndex.getCount() > 0) {
            matchingIndex.moveToFirst();
            while (!matchingIndex.isAfterLast()) {
                context.getContentResolver().delete(ContentUris.withAppendedId(Media.EXTERNAL_CONTENT_URI, (long) matchingIndex.getInt(matchingIndex.getColumnIndex("_id"))), null, null);
                matchingIndex.moveToNext();
            }
            matchingIndex.close();
        }
    }
}

Answer 2

你可以发送广播

Intent intent =
      new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
intent.setData(Uri.fromFile(file));
sendBroadcast(intent);

或者如果你想回调

MediaScannerConnection.scanFile(
      getApplicationContext(),
      new String[]{file.getAbsolutePath()},
      null,
      new OnScanCompletedListener() {
         @Override
         public void onScanCompleted(String path, Uri uri) {

         }
      });

从外部存储中删除图像后刷新图库

2 个答案: