Xamrin.Android的Google Drive ApI V3迁移

Question

[请让我知道如何迁移到Google Drive API v2或V3。我找到了与java有关的所有迁移答案。找不到与Google Drive API v2或V3等效的xamarin nuget程序包。

我已经尝试过使用此Xamarin.GooglePlayServices.Drive nuget程序包，但是在此描述了所有驱动器api。

有人可以在xamarin中尝试Google驱动器集成。请帮助我。这是我的尝试

    GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DefaultSignIn)
                .RequestEmail()
                .Build();

    var mGoogleApiClient = new GoogleApiClient.Builder(this)
                .EnableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */)
                .AddApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .Build();


     MetadataChangeSet changeSet = new MetadataChangeSet.Builder()
            .SetTitle(_backupFolderName)
            .Build();
        IDriveFolderDriveFolderResult result;
        try
        {
            result = await DriveClass.DriveApi.GetRootFolder(_googleApiClient)
                .CreateFolderAsync(_googleApiClient, changeSet);
        }
        catch (Exception)
        {
            return null;
        }

Answer 1

我找不到支持Xamarin和OAuth身份验证的Google驱动器的任何nuget程序包。所以我找到了使用Http Client Rest API的方法]

请执行以下步骤

1. 使用Google Developer Console创建OAuth客户端ID

2. 使用客户端ID以及其他信息，例如重定向

   public class GoogleAuthenticator : OAuth2Authenticator
   {
   public static OAuth2Authenticator Auth;
   
   public GoogleAuthenticator(string clientId, string scope, Uri authorizeUrl, Uri redirectUrl,
       GetUsernameAsyncFunc getUsernameAsync = null, bool isUsingNativeUi = false) : base(clientId, scope,
       authorizeUrl, redirectUrl, getUsernameAsync, isUsingNativeUi)
   {
       Auth = new OAuth2Authenticator(clientId, string.Empty, scope,
           authorizeUrl,
           redirectUrl,
           new Uri(GoogleDriveConfig.AccessTokenUri),
           null, true);
   
       Auth.Completed += OnAuthenticationCompleted;
       Auth.Error += OnAuthenticationFailed;
   }
   
   public void OnAuthenticationCompleted(object sender,AuthenticatorCompletedEventArgs e)
   {
       if (e.IsAuthenticated)
       {
           AuthenticationCompleted?.Invoke(e.Account.Properties["access_token"],
               e.Account.Properties["refresh_token"], e.Account.Properties["expires_in"]);
       }
   
   }
   
   public void OnAuthenticationFailed(object sender, AuthenticatorErrorEventArgs e)
   {
   
   }
   

3. 启动浏览器

   public void SignInToDrive(Activity context)
     {
       Intent loginUi = Auth.GetUI(context);
   
       CustomTabsConfiguration.IsShowTitleUsed = false;
       CustomTabsConfiguration.IsActionButtonUsed = false;
       context.StartActivity(loginUi);
     }
   

4. 创建GoogleAuthInterceptor活动

     [Activity(Label = "GoogleAuthInterceptor")] 
     [  IntentFilter ( actions: new[] 
     {Intent.ActionView}, 
      Categories = new[] { Intent.CategoryDefault, 
     Intent.CategoryBrowsable }, 
     DataSchemes = new[] {"YOUR PACKAGE NAME"}, DataPaths = new[] { "/oauth2redirect" 
      } ) ]
   
     public class GoogleAuthInterceptor : Activity
    {
      protected override void OnCreate(Bundle savedInstanceState)
     {
       base.OnCreate(savedInstanceState);
       Uri uriAndroid = Intent.Data;
   
       System.Uri uri = new System.Uri(uriAndroid.ToString());
   
           var intent = new Intent(ApplicationContext, typeof(MainActivity));
           intent.SetFlags(ActivityFlags.ClearTop | ActivityFlags.SingleTop);
           StartActivity(intent);
   
       GoogleAuthenticator.Auth.OnPageLoading(uri);
   
       Finish();
       return;
   }
   }
   

5. 将文件上传到Google云端硬盘

   此基本地址适用于以下所有Google Drive API的

     HttpClient _httpClient = httpClient ?? new HttpClient
       {
           BaseAddress = new Uri(),
   
       };
   
   private async Task<HttpResponseMessage> CreateResumableSession(string accessToken, string fileName, long fileSize, string folderId)
   {
   
       var sessionRequest = new 
       HttpRequestMessage(HttpMethod.Post,"upload/drive/v3/files?uploadType=resumable");
       sessionRequest.Headers.Add("Authorization", "Bearer " + accessToken);
       sessionRequest.Headers.Add("X-Upload-Content-Type", "*/*");
       sessionRequest.Headers.Add("X-Upload-Content-Length", fileSize.ToString());
   
       string body = "{\"name\": \"" + fileName + "\", \"parents\": [\"" + folderId + "\"]}";
       sessionRequest.Content = new StringContent(body);
       sessionRequest.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
     using (var sessionResponse = await _httpClient.SendAsync(sessionRequest) )
       {
           return sessionResponse;
       };
   

6. 更新Google云端硬盘中的文件

   private async Task<bool> UpdateFile(string accessToken,string fileId,long fileSize,Stream stream)
   {
      HttpRequestMessage sessionRequest = new HttpRequestMessage(new HttpMethod("PATCH"), "upload/drive/v3/files/" + $"{fileId}");
       sessionRequest.Headers.Add("Authorization", "Bearer " + accessToken);
       sessionRequest.Headers.Add("X-Upload-Content-Type", "*/*");
       sessionRequest.Headers.Add("X-Upload-Content-Length", fileSize.ToString());
       sessionRequest.Content = new StreamContent(stream);
       sessionRequest.Content.Headers.ContentType = new MediaTypeHeaderValue("*/*");
   
       using (var response = await _httpClient.SendAsync(sessionRequest))
       {
           return response.IsSuccessStatusCode;
       }
   }
   

7. 下载文件

     public async Task<Stream> DownloadFile(string accessToken, string fileId)
   {
       var request = new HttpRequestMessage(HttpMethod.Get,"drive/v3/files"+ $"/{fileId}" + "?fields=*&alt=media");
       request.Headers.Add("Authorization", "Bearer " + accessToken);
   
       var response = await _httpClient.SendAsync(request);
   
       if (response.IsSuccessStatusCode)
       {
           var contents = await response.Content.ReadAsStreamAsync();
           return contents;
       }
   
       return null; 
   }
   

8. 获取所有文件

   public  async Task<GoogleDriveItem> GetFiles(string folderId, string accessToken)
   {  
       var request = new HttpRequestMessage(HttpMethod.Get,
           "drive/v3/files" +  "?q=parents%20%3D%20'" +
           $"{folderId}" +
           "'%20and%20trashed%20%3D%20false&fields=files(id%2Cname%2Ctrashed%2CmodifiedTime%2Cparents)");
       request.Headers.Add("Authorization", "Bearer " + accessToken);
       request.Headers.Add("Accept", "application/json");
       request.Headers.CacheControl = new CacheControlHeaderValue() { NoCache = true 
       };
   
       using (var response = await _httpClient.SendAsync(request))
       {
           var content = await response.Content.ReadAsStringAsync();
           return (JsonConvert.DeserializeObject<GoogleDriveItem>(content));
       }
   }