无法获取我刚刚在Google驱动器上创建的folderId

Question

public class Helpers  extends Activity implements

    GoogleApiClient.ConnectionCallbacks,

    GoogleApiClient.OnConnectionFailedListener {

SharedPreferences preferences;

private static final String TAG = "BaseDriveActivity";

public static  String EXISTING_FOLDER_ID;

protected static final int REQUEST_CODE_RESOLUTION = 1;

protected static final int NEXT_AVAILABLE_REQUEST_CODE = 2;

public static final String folderId = "FOLDER_ID";

public static final String fileName = "folderId";

private GoogleApiClient mGoogleApiClient;

@Override

protected void onResume() {

    super.onResume();

    if (mGoogleApiClient == null) {

        mGoogleApiClient = new GoogleApiClient.Builder(this)

                .addApi(Drive.API)

                .addScope(Drive.SCOPE_FILE)

                .addScope(Drive.SCOPE_APPFOLDER) // required for App Folder sample

                .addConnectionCallbacks(this)

                .addOnConnectionFailedListener(this)

                .build();

    }

    mGoogleApiClient.connect();

}

@Override

protected void onActivityResult(int requestCode, int resultCode,

                                Intent data) {

    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == REQUEST_CODE_RESOLUTION && resultCode == RESULT_OK) {

        mGoogleApiClient.connect();

    }

}

@Override

protected void onPause() {

    if (mGoogleApiClient != null) {

        mGoogleApiClient.disconnect();

    }

    super.onPause();

}

我想安装应用程序时创建一个文件夹，然后获取其ID并将其保存到sharedprefrences ..此后，我想在该文件夹中创建一个文件，但是当我使用传递该folderID在其中创建文件时，它会说 “无法找到DriveId。您是否有权查看此文件？”

如果我result.getDriveFolder().getDriveId().getResourceId() 用来获取ID的话，它总是会为null。

我正在使用此代码首先创建粘贴了https://github.com/googledrive/android-demos/blob/master/src/com/google/android/gms/drive/sample/demo/CreateFolderActivity.java的文件夹

并在文件夹中创建文件，我正在使用本指南 https://github.com/googledrive/android-demos/blob/master/src/com/google/android/gms/drive/sample/demo/CreateFileInFolderActivity.java

我通过folderiD我保存的文件，并通过它创建文件功能。