我需要从 Android 应用程序 c# 将图像文件上传到 Google 驱动器

Question

您好，我想从我的 Android 应用程序将图像上传到谷歌驱动器。

App 拍照并存储在：

public static File _file;

我想将 _file 上传到 Google 云端硬盘

我连接并使用以下代码创建一个空的 jpg 文件：

`using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using MySql.Data.MySqlClient;
using System.Data;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Drive.v3.Data;
using Google.Apis.Services;
using Google.Apis.Util.Store;
using Google.Apis.Upload;
using Google.Apis.Http;
using Android.Util;
using Android.Gms.Common;
using Android.Gms.Common.Apis;
using Android.Gms.Drive;
using System.Threading.Tasks;
using Java.IO;
using Google.Apis.Drive.v3;

namespace Fotonet
{
[Activity(Label = "Activity2")]
public class Activity2 : Activity, GoogleApiClient.IConnectionCallbacks, IResultCallback, IDriveApiDriveContentsResult
{
const string TAG = "Fotonet";
const int REQUEST_CODE_RESOLUTION = 3;

GoogleApiClient _googleApiClient;

protected override void OnCreate(Bundle savedInstanceState)
{
    base.OnCreate(savedInstanceState);

    SetContentView(Resource.Layout.prova2);

    Button button = FindViewById<Button>(Resource.Id.myButton);
    button.Click += delegate
    {
        Activity1.Global.count = 2;

        if (_googleApiClient == null)
        {
            _googleApiClient = new GoogleApiClient.Builder(this)
              .AddApi(DriveClass.API)
              .AddScope(DriveClass.ScopeFile)
              .AddConnectionCallbacks(this)
              .AddOnConnectionFailedListener(OnConnectionFailed)
              .Build();
        }
        if (!_googleApiClient.IsConnected)
            _googleApiClient.Connect();



    };



}

protected void OnConnectionFailed(ConnectionResult result)
{
    Log.Info(TAG, "GoogleApiClient connection failed: " + result);
    if (!result.HasResolution)
    {
        GoogleApiAvailability.Instance.GetErrorDialog(this, result.ErrorCode, 0).Show();
        return;
    }
    try
    {
        result.StartResolutionForResult(this, REQUEST_CODE_RESOLUTION);
    }
    catch (IntentSender.SendIntentException e)
    {
        Toast.MakeText(this, e.ToString(), ToastLength.Short).Show();
    }
}

public void OnConnected(Bundle connectionHint)
{
    Toast.MakeText(this, "Connesso a Google", ToastLength.Short).Show();
    DriveClass.DriveApi.NewDriveContents(_googleApiClient).SetResultCallback(this);
    Activity1.Global.count += 1;
    //StartActivity(typeof(MainActivity));
}

protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
    base.OnActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_CODE_RESOLUTION)
    {
        switch (resultCode)
        {
            case Result.Ok:
                _googleApiClient.Connect();
                break;
            case Result.Canceled:
                Toast.MakeText(this, "Unable to sign in", ToastLength.Short).Show();
                Log.Error(TAG, "Unable to sign in, is app registered for Drive access in Google Dev Console?");
                break;
            case Result.FirstUser:
                Toast.MakeText(this, "Unable to sign in: RESULT_FIRST_USER", ToastLength.Short).Show();
                Log.Error(TAG, "Unable to sign in: RESULT_FIRST_USER");
                break;
            default:
                Log.Error(TAG, "Should never be here: " + resultCode);
                return;
        }
    }
}

void IResultCallback.OnResult(Java.Lang.Object result)
{
    var contentResults = (result).JavaCast<IDriveApiDriveContentsResult>();
    if (!contentResults.Status.IsSuccess) // handle the error
        return;
    Task.Run(() =>
    {
         var image = new FileOutputStream(App._file);

        //writer.Write("Stack Overflow");
        //writer.Close();
        MetadataChangeSet changeSet = new MetadataChangeSet.Builder()
               .SetTitle("Fotonet.jpg")
               .SetMimeType("image/jpeg")
               .Build();
        DriveClass.DriveApi
                  .GetRootFolder(_googleApiClient)
                  .CreateFile(_googleApiClient, changeSet, contentResults.DriveContents);
    });
}

public void OnConnectionSuspended(int cause)
{
    throw new NotImplementedException();
}

public IDriveContents DriveContents
{
    get
    {
        throw new NotImplementedException();
    }
}

public Statuses Status
{
    get
    {
        throw new NotImplementedException();
    }
}
}
} `

如何填充这个空文件？

谢谢！

当我尝试上传它时，会创建一个空文件 jpg。

对不起，我的英语不好。

Answer 1

如何填充这个空文件？

如果你只是想创建基本的图片文件，那么使用以下方法：

private Bitmap CreateBitmap(int w, int h)
{
    Bitmap bitmap = Bitmap.CreateBitmap(w, h, Config.Argb8888);
    int[] pixels = new int[w * h];
    for (int x = 0; x < w * h; x++)
    {
        pixels[x] = Color.Blue.ToArgb();
    }
    bitmap.SetPixels(pixels, 0, w, 0, 0, w, h);
    return bitmap;
}

您可以使用以下代码将图像文件上传到 Google Drive：

DriveClass.DriveApi.NewDriveContents(client).SetResultCallback(new System.Action<IDriveApiDriveContentsResult>((result)=> {

            //Create MetadataChangeSet
            MetadataChangeSet metadataChangeSet = new MetadataChangeSet.Builder()
                .SetTitle("Test.jpg")
                .SetMimeType("image/jpeg").Build();

            var contents = result.DriveContents;
            //create the bitmap
            Bitmap bitmap = CreateBitmap(800, 800);
            //push the bitmap data to DriveContents
            bitmap.Compress(CompressFormat.Jpeg, 1, contents.OutputStream);
            IntentSender intentSender = DriveClass.DriveApi
                    .NewCreateFileActivityBuilder()
                    .SetInitialMetadata(metadataChangeSet)
                    .SetInitialDriveContents(contents)
                    .Build(client);

            StartIntentSenderForResult(intentSender, 2, null, 0, 0, 0);
        }));