listChildren在rootFolder上返回零计数 - googledrive apiMet [英] listChildren returning zero count on rootFolder - googledrive apiMet

问题描述

  DriveFolder mFolder = Drive.DriveApi.getRootFolder（Drive.DriveApi.getRootFolder（移动客户端）; 
 mFolder.listChildren（mClient）.setResultCallback（mChilds）; 
  

，回调是 -

MetadataBuffer mBuffer = arg0.getMetadataBuffer（）;
StringBuilder mBuilder = new StringBuilder（）;
int count = mBuffer.getCount（）;
迭代器<元数据> itr = mBuffer.iterator（）;
while（itr.hasNext（））{
Metadata mData = itr.next（）;
mBuilder.append（mData.getTitle（）+\\\
）;
}
TextView tView =（TextView）findViewById（R.id.txt）;
tView.setText（mBuilder.toString（））;
}

我在这里做错了什么？
在此先感谢。

解决方案

问题在于范围。 Google play服务库仅支持Scope
FILE_SCOPE
和
APP_FOLDER_SCOPE
都可以获取使用该应用程序创建的文件。
服务库不支持全驱动器访问。出于这个原因，listChildren返回了0个元素（这意味着没有该应用程序创建的文件）。

I am getting zero child from the root folder while accessing my drive.

DriveFolder mFolder = Drive.DriveApi.getRootFolder(mClient);
mFolder.listChildren(mClient).setResultCallback(mChilds);

and the callback is -

public void onResult(MetadataBufferResult arg0) {
    MetadataBuffer mBuffer = arg0.getMetadataBuffer();
    StringBuilder mBuilder = new StringBuilder();
    int count = mBuffer.getCount();
    Iterator<Metadata> itr = mBuffer.iterator();
    while (itr.hasNext()) {
        Metadata mData = itr.next();
        mBuilder.append(mData.getTitle() + "\n");
    }
    TextView tView = (TextView) findViewById(R.id.txt);
    tView.setText(mBuilder.toString());
}

What am I doing wrong here?? Thanks in advance.

解决方案

The problem was with scope. Google play service library only supports Scope FILE_SCOPE and APP_FOLDER_SCOPE both can get file which is created with the application. The service library doesnot support full drive access. For this reason listChildren was returning 0 elements (meaning there was no file which was created by this application).

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