Google Drive API implementation Xamarin Android - xamarin

Question

Our application should have the functionality to save Application files to Google Drive. Of course, using the local configured account.
From Android API i tried to figure out some clue. But android API with Xamarin implementation seems very tough for me.
I have installed Google Play Services- Drive from Xamarin Components but there are no examples listed from which we can refer the flow and functionality.

Answer 1

The basic steps (see the link below for full details):
Create GoogleApiClient with the Drive API and Scope
Try to connect (login) the GoogleApiClient
The first time you try to connect it will fail as the user has not selected a Google Account that should be used
Use StartResolutionForResult to handle this condition
When GoogleApiClient is connected
Request a Drive content (DriveContentsResult) to write the file contents to.
When the result is obtained, write data into the Drive content.
Set the metadata for the file
Create the Drive-based file with the Drive content
Note: This example assumes that you have Google Drive installed on your device/emulator and you have registered your app in Google's Developer API Console with the Google Drive API Enabled.
C# Example:
[Activity(Label = "DriveOpen", MainLauncher = true, Icon = "#mipmap/icon")]
public class MainActivity : Activity, GoogleApiClient.IConnectionCallbacks, IResultCallback, IDriveApiDriveContentsResult
{
const string TAG = "GDriveExample";
const int REQUEST_CODE_RESOLUTION = 3;
GoogleApiClient _googleApiClient;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.Main);
Button button = FindViewById<Button>(Resource.Id.myButton);
button.Click += delegate
{
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)
{
Log.Error(TAG, "Exception while starting resolution activity", e);
}
}
public void OnConnected(Bundle connectionHint)
{
Log.Info(TAG, "Client connected.");
DriveClass.DriveApi.NewDriveContents(_googleApiClient).SetResultCallback(this);
}
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:
Log.Error(TAG, "Unable to sign in, is app registered for Drive access in Google Dev Console?");
break;
case Result.FirstUser:
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 writer = new OutputStreamWriter(contentResults.DriveContents.OutputStream);
writer.Write("Stack Overflow");
writer.Close();
MetadataChangeSet changeSet = new MetadataChangeSet.Builder()
.SetTitle("New Text File")
.SetMimeType("text/plain")
.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();
}
}
}
Ref: https://developers.google.com/drive/android/create-file