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;@Overrideprotected 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();}@Overrideprotected void onActivityResult(int requestCode, int resultCode,                                Intent data) {    super.onActivityResult(requestCode, resultCode, data);    if (requestCode == REQUEST_CODE_RESOLUTION && resultCode == RESULT_OK) {        mGoogleApiClient.connect();    }}@Overrideprotected void onPause() {    if (mGoogleApiClient != null) {        mGoogleApiClient.disconnect();    }    super.onPause();}我想安裝應用程序時創建一個文件夾，然后獲取其ID并將其保存到sharedprefrences ..此后，我想在該文件夾中創建一個文件，但是當我使用傳遞該folderID在其中創建文件時，它會說 “無法找到DriveId。您是否有權查看此文件？”如果我result.getDriveFolder().getDriveId().getResourceId() 用來獲取ID的話，它總是會為null。我正在使用此代碼首先創建粘貼了https://github.com/googledrive/android-demos/blob/master/src/com/google/android/gms/drive/sample/demo/CreateFolderActivity.java的文件夾并在文件夾中創建文件，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我通過folderiD我保存的文件，并通過它創建文件功能。