在Android上获取所有文件夹Google Drive API

Question

我使用新的Google驱动器api，但无法从Google驱动器中获取所有文件夹，只能获取使用Google驱动器api创建的文件夹…有人知道为什么会这样吗？

这是我的代码：

@Override
    protected void onResume() {
        super.onResume();
        if (mGoogleApiClient == null) {
            // Create the API client and bind it to an instance variable.
            // We use this instance as the callback for connection and connection
            // failures.
            // Since no account name is passed, the user is prompted to choose.
            mGoogleApiClient = new GoogleApiClient.Builder(this)
                    .addApi(Drive.API)
                    .addScope(Drive.SCOPE_FILE)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .build();
        }
        // Connect the client. Once connected, the camera is launched.
        mGoogleApiClient.connect();
    }


    /**
     * Handles resolution callbacks.
     */
    @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();

        }
    }

    /**
     * Called when activity gets invisible. Connection to Drive service needs to
     * be disconnected as soon as an activity is invisible.
     */
    @Override
    protected void onPause() {
        if (mGoogleApiClient != null) {
            mGoogleApiClient.disconnect();
        }
        super.onPause();
    }

    /**
     * Called when {@code mGoogleApiClient} is connected.
     */
    @Override
    public void onConnected(Bundle connectionHint) {
        Log.i(TAG, "GoogleApiClient connected");

        rootFolder = Drive.DriveApi.getRootFolder(mGoogleApiClient);

       rootFolder.listChildren(getGoogleApiClient()).setResultCallback(pruebaChildren);

    }


    ResultCallback<DriveApi.MetadataBufferResult> pruebaChildren = new
            ResultCallback<DriveApi.MetadataBufferResult>() {
                @Override
                public void onResult(DriveApi.MetadataBufferResult metadataBufferResult) {
                    if (!metadataBufferResult.getStatus().isSuccess()) {
                        showMessage("Problem while retrieving files");
                        return;
                    }
                    Log.i(TAG,"got root folder");
                    MetadataBuffer buffer = metadataBufferResult.getMetadataBuffer();
                    Log.i(TAG,"Buffer count  " + buffer.getCount());
                    if(buffer.getCount() == 0){
                        createFolderApp();
                    }
                    else{
                        for(Metadata m : buffer){
                            Log.i(TAG,"Metadata name  " + m.getTitle() + "(" + (m.isFolder() ? "folder" : "file") + ")");
                            if (m.isFolder() && m.getTitle().equals(TAG)){
                                Log.i(TAG,"APP FOLDER FOUND");
                                Drive.DriveApi.getFolder(mGoogleApiClient, m.getDriveId())
                                        .listChildren(mGoogleApiClient)
                                        .setResultCallback(foreachAppAplication);
                            }
                        }
                    }
                    return;
                }
            };

现在，我想查看rootFolder驱动器中的所有文件夹，我尝试了requestSync（），但结果是相同的……请提供帮助！

另一个问题：如何设置AppFolder？我只看到getAppFolder，但如何设置？

谢谢

Answer 1

根据设计，GDAA仅支持FILE范围，即它将仅查找/列出由Android应用程序创建的文件夹/文件。

有两种解决方法：

1. 使用GDAA 的 意图 之一，基本上是让用户选择文件/文件夹。这样，它将对您的应用程序可用。
2. 使用其他API，即REST Api，它支持DRIVE范围，为您的应用程序提供完整的文件/文件夹集。

如果您想研究这两个API的行为，我在Github上放置了两个不同的演示（REST和GDAA
CRUD演示包装器）。

您问题的第二部分没有答案。您没有设置应用程序文件夹，只能获取它的DriveFolder ID。您可以使用它来创建/检索对象。

  DriveFolder appFldr = Drive.DriveApi.getAppFolder(mGooleApiClient);
  appFldr.createFile(...);
  appFldr.createFolder(...);
  appFldr.listChildren(...);
  appFldr.queryChildren(...);

…并且不要忘记添加 SCOPE_APPFOLDER 范围

祝好运