我的 Google云端硬盘 中有一些其他人与我共享的文件，我希望能够对其进行查询。不幸的是，MetadataBuffer的结果计数为0

这是代码：

private GoogleApiClient mGoogleApiClient;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_activity);

    mGoogleApiClient = new GoogleApiClient.Builder(this).addApi(com.google.android.gms.drive.Drive.API)
            .addScope(com.google.android.gms.drive.Drive.SCOPE_FILE).addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this).build();

}

@Override
protected void onStart() {
    super.onStart();
    mGoogleApiClient.connect();
}

@Override
public void onConnected(Bundle arg0) {
    Query query = new Query.Builder().addFilter(Filters.sharedWithMe()).build();
    Drive.DriveApi.query(mGoogleApiClient, query).setResultCallback(metadataCallback);
}

private ResultCallback<DriveApi.MetadataBufferResult> metadataCallback =
        new ResultCallback<DriveApi.MetadataBufferResult>() {
            @Override
            public void onResult(DriveApi.MetadataBufferResult result) {
                if (!result.getStatus().isSuccess()) {
                    Log.d(TAG, "Problem while retrieving results");
                    return;
                }

                MetadataBuffer buffer = result.getMetadataBuffer();
                if(buffer != null) {
                    int cnt = buffer.getCount();
                    Log.d(TAG, "BUFFER COUNT: " + cnt);
                    for(int i = 0; i < cnt; i++) {
                        Metadata meta = buffer.get(i);
                        Log.d(TAG, meta.getTitle());
                    }
                    buffer.close();
                }
            }
        };

        ....................

我正在使用新的Google云端硬盘，并且还尝试将一些共享文件从“ 传入文件夹” 移到“ 我的云端硬盘”
根目录中。依然没有。我将不胜感激任何帮助和建议。