Question

我正在尝试从google驱动器中的现有文件中获取一些数据。搜索正确地返回了一些元数据，但是当我尝试获取文件的最后修改日期时，我得到null。我不明白这是我的代码的一部分：

const async = require('async'); // async node module : npm install --save async

        Test.aggregate([
            {$match: {'ownerid': req.body.ownerid}},
            {$unwind: '$groupname'},
            {$project: {_id:1, groupname :"$groupname"}}
        ], function(error, data){
            if(error) {
                console.log(error);
            } else {
                //Use async module instead of simple javascript loop
                var primaryfilter = {'userid': req.body.ownerid};
                var activityname = 'Group Owned';
                async.eachSeries(data, function(dataItem, asyncCallback){

                    var secondaryfilter = { "groupowned" : { 'groupid': dataItem._id, 'groupname': dataItem.groupname } };

                    Test1.update(primaryfilter, {$push: secondaryfilter}, function(error, result){
                        if (error) {
                            asyncCallback(error);
                        } else {
                            asyncCallback();
                        }
                    });

                }, function(err){
                    if(err) {
                        return res.send({"error":"true", "status":"500", "message":"Oops! Some error occurred while updating the "+activityname+" on Post"});
                    }
                    return res.send({"error":"false", "status":"201", "message":"Successfully Updated "+activityname+" on Post"});
                });
            }
        });

结果：

FileList result = null;
        try {
            result = mService.files().list()
                    .setQ("name = file.db and trashed = false")
                    .execute();
        } catch (IOException e) {
            e.printStackTrace();
        }
 Log.d("Sync_drive", result);
 List<com.google.api.services.drive.model.File> files;
  if (result != null) {
  for (com.google.api.services.drive.model.File fileD : files) {
 dateModified = String.valueOf(fileD.getModifiedTime().getValue());
 gdid = fileD.getId();
 Log.d("Sync_drive", "id: " + gdid);
 }

和

过程：PID：27987 java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法'long com.google.api.client.util.DateTime.getValue（）'

Answer 1

首先需要连接到谷歌客户端：这是一个例子：

protected synchronized void buildGoogleApiClient() {
        if (checkPlayServices()) {
                    .requestServerAuthCode(BuildConfig.GOOGLE_WEB_CLIENT_ID)
                    .requestEmail()
                    .build();
            // Build a GoogleApiClient with access to the Google Sign-In API and the
            // options specified by gso.
            mGoogleApiClient = new GoogleApiClient.Builder(this)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .addApi(/*Api for google Drive*/)
                    .enableAutoManage(this, this)
                    .build();
            mGoogleApiClient.connect();

        }
    }

您还必须在同一个活动中实现回调函数：，GoogleApiClient.OnConnectionFailedListener，GoogleApiClient.ConnectionCallbacks

连接客户端后，您可以从文件中获取数据

google.api.client从文件中获取null

1 个答案: