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Download file using Google drive api v3 in java

I try to use google drive api v3 to download file in java with this code i get it from github from this link this link of java file in github
package drive.sample;
import ...
public class MainActivity extends AppCompatActivity {
private static ByteArrayOutputStream downloadFile(String realFileId) throws IOException{
/* Load pre-authorized user credentials from the environment.
TODO(developer) - See https://developers.google.com/identity for
guides on implementing OAuth2 for your application.*/
GoogleCredentials credentials = GoogleCredentials.getApplicationDefault().createScoped(Arrays.asList(DriveScopes.DRIVE_FILE));
HttpRequestInitializer requestInitializer = new HttpCredentialsAdapter(
credentials);
// Build a new authorized API client service.
Drive service = new Drive.Builder(new NetHttpTransport(),
GsonFactory.getDefaultInstance(),
requestInitializer)
.setApplicationName("Drive samples")
.build();
try {
OutputStream outputStream = new ByteArrayOutputStream();
service.files().get(realFileId)
.executeMediaAndDownloadTo(outputStream);
return (ByteArrayOutputStream) outputStream;
}catch (GoogleJsonResponseException e) {
// TODO(developer) - handle error appropriately
System.err.println("Unable to move file: " + e.getDetails());
throw e;
}
}
}
// [END drive_download_file]
But when run app it show me this error
Error : type of HttpCredentialsAdapter (com. google . auth.Credentials) is erroneous
How i can solve this problem ?

WordAPI ApiException caught: Not Found

I'm following [this][1] documentation to connect to api, I want to build a JavaFX app that you can enter a word and it's retrieves it from api and I wanted to test the feature before displaying contents on GUI. Howerer I got this exception that the words is not found while I tested endpoint in their website and that word had definitions. I'm pretty new to using API perhaps I missed something that isn't shown in the documentation?
Here is my code:
public void testDetailsWords(String word,String detail) {
//String word = "lovely"; // Word
//String detail = "definitions"; // Detail
TimeZone.setDefault(TimeZone.getTimeZone("UTC"));
apiClient = Configuration.getDefaultApiClient();
apiClient.setBasePath("https://www.wordsapi.com/");
// configure authentications
Authentication auth;
auth = apiClient.getAuthentication("Default");
((ApiKeyAuth) auth).setApiKey(Apikey);
try {
WordsApi wordsApi = new WordsApi();
DetailsResponse response = wordsApi.details(word, detail);
System.out.println(response);
} catch (ApiException e) {
System.out.printf("ApiException caught: %s\n", e.getMessage());
}
}
Here is my Controller code :
#FXML
private void handleDefinitions(ActionEvent event) throws IOException {
String word =definitionsfield.getText();
String detail= "definitions";
apiCall.testDetailsWords(word,detail);
}
I would be grateful for the help.
[1]: http://restunited.com/docs/6vc24wq3ojpq

It's seems that tutorial that I tried following is very misleading which is very dissapoing, but I've learned my lesson now .
I decided to use Unirest to get request and it's worked perfectly.
If you stumble upon the link it's better not to follow that tutorial

Issues with converting java to c#

I'm attempting to convert the code located at How to use signalr in android Service from java to c# and have been making some progress. I'm now stuck at the final method. The java code is:
private void startSignalR() {
Platform.loadPlatformComponent(new AndroidPlatformComponent());
mInstance.setmHubConnection();
mInstance.setHubProxy();
ClientTransport clientTransport = new ServerSentEventsTransport(mInstance.mHubConnection.getLogger());
SignalRFuture<Void> signalRFuture = mInstance.mHubConnection.start(clientTransport);
try {
signalRFuture.get();
} catch (InterruptedException | ExecutionException e) {
Log.e("SimpleSignalR", e.toString());
return;
}
mInstance.sendMessage(MainActivity.unm,"Hello All!");
String CLIENT_METHOD_BROADAST_MESSAGE = "recievedMessage";
mInstance.mHubProxy.on(CLIENT_METHOD_BROADAST_MESSAGE,
new SubscriptionHandler2<String,LoginInfo>() {
#Override
public void run(final String msg,final LoginInfo loginInfo) {
final String finalMsg = loginInfo.FullName + " says " + loginInfo.Password;
Intent intent = new Intent();
intent.setAction(MY_ACTION);
intent.putExtra("DATAPASSED", finalMsg);
sendBroadcast(intent);
}
}
, String.class,LoginInfo.class);
}
Using a java to c# converter, this translated to:
private void startSignalR()
{
Platform.loadPlatformComponent(new AndroidPlatformComponent());
mInstance.setmHubConnection();
mInstance.setHubProxy();
ClientTransport clientTransport = new ServerSentEventsTransport(mInstance.mHubConnection.Logger);
SignalRFuture<Void> signalRFuture = mInstance.mHubConnection.Start(clientTransport);
try
{
signalRFuture.get();
}
catch (Exception e) when (e is InterruptedException || e is ExecutionException)
{
// Log.e("SimpleSignalR", e.ToString());
return;
}
mInstance.sendMessage("", "Hello All!");
string CLIENT_METHOD_BROADAST_MESSAGE = "recievedMessage";
//String CLIENT_METHOD_BROADAST_MESSAGE = "messageReceived";
mInstance.mHubProxy.on(CLIENT_METHOD_BROADAST_MESSAGE, new SubscriptionHandler2AnonymousInnerClass(this)
, typeof(string), typeof(LoginInfo));
}
private class SubscriptionHandler2AnonymousInnerClass : SubscriptionHandler2<string, LoginInfo>
{
private readonly SignalRSrv outerInstance;
public SubscriptionHandler2AnonymousInnerClass(SignalRSrv outerInstance)
{
this.outerInstance = outerInstance;
}
//JAVA TO C# CONVERTER WARNING: 'final' parameters are not available in .NET:
//ORIGINAL LINE: #Override public void run(final String msg,final LoginInfo loginInfo)
public override void run(string msg, LoginInfo loginInfo)
{
//JAVA TO C# CONVERTER WARNING: The original Java variable was marked 'final':
//ORIGINAL LINE: final String finalMsg = loginInfo.FullName + " says " + loginInfo.Password;
string finalMsg = loginInfo.FullName + " says " + loginInfo.Password;
Intent intent = new Intent();
intent.Action = MY_ACTION;
intent.PutExtra("DATAPASSED", finalMsg);
sendBroadcast(intent);
}
}
This, of course, generated several errors in Visual Studio 2017.
First, the line Platform.loadPlatformComponent(new AndroidPlatformComponent()); generated the error Platform is inaccessible due to its protection level. Platform in Xamarin for Visual Studio 2017 is indeed protected and is a internal class in System and I cannot change this, so I'm at a loss as how to proceed with it. The same line generates the error The type or namespace name 'AndroidPlatformComponent' could not be found, these errors a numerous and not unexpected I just can't find an equivalent to AndroidPlatformComponent in Visual Studio 2017 so I'm at a loss as how to solve this one.
Next, on this line ClientTransport clientTransport = new ServerSentEventsTransport(mInstance.mHubConnection.Logger); generates the error The type or namespace name 'ClientTransport' could not be found, I was also unable to find an equivalent to this and again I'm at a loss as to proceed. Also on this line, .Logger is not defined for the hub connection, apparently it's .getLogger() in java, I was unable to find an equivalent for this one as well.
Next the line SignalRFuture<Void> signalRFuture = mInstance.mHubConnection.Start(clientTransport);' generates the error 1The type or namespace name 'SignalRFuture<>' could not be found, this seemes to be specific to SignalR, again, I am unable to find an equivalent.
The next one has me totally stumped, the line private class SubscriptionHandler2AnonymousInnerClass : SubscriptionHandler2<string, LoginInfo> generates the error The type or namespace name 'SubscriptionHandler2<,>' could not be found. I've looked everywhere online and read up on AnonymousInnerClass, but it was not help with this.
I'm hoping that the users here are more familiar with SignalR and the differences between c# functionality and java functionality. I'm not at all familiar with java nor am I familiar with SignalR and foreground services.

As it turns out, the last method in the java code I was converting was wiring up an event to pass the message received from the hub to the activity. In c# / Visual Studio (2017), that's done very differently which is why I didn't understand/recognize what was going on. So I created a handler in C# and execute a popup message for the message. This in itself may pose problems, but at least I know what's going on. This is the code I wrote to start SignalR from within the service and WireUp the handler:
private void startSignalR()
{
// Company, Department, and section are private variables
// their values are pulled from the intent bundle
// in the OnBind method, that code is:
// Bundle bundlee = intent.GetBundleExtra("TheBundle");
// MyUser = bundlee.GetParcelable("MyUser") as User;
// This information is put into the bundle when the user is logged in.
// I then pass that information to the SignalR client
// when I set the hub connection and placed on the querystring to the hub.
mInstance.setmHubConnection(username, firstname,lastname,company,department,section);
mInstance.setHubProxy();
try
{
// Connect the client to the hup
mInstance.mHubConnection.Start();
// Set the event handler
mInstance.WireUp();
}
catch (System.Exception e) when (e is InterruptedException || e is ExecutionException)
{
ShowMessage("Error: + e.Message)
}
}
This is the WireUp code, this is a method in the client code:
public void WireUp()
{
// set the event handler
mHubProxy.On("broadcastMessage", (string platform, string message) =>
{
if (OnMessageReceived != null)
OnMessageReceived(this, string.Format("{0}: {1}", platform, message));
});
}
As I had anticipated, the popup message won't appear when the app is in the background, so I'm researching a workaround

Access Youtube API

I want to use Youtube API to get the subscription list of a user. It requires oauth.
I read that implementing google sign in will make it easier to access this API
I followed Google's documentation and now I got the signing in working
I have these files now.
My question:
1) Which sample do I need to use, IdTokenActivity.java or RestApiActivity.java
2) How can I use the sample code to access Youtube API? It doesn't say and the documentation is confusing

Which sample do I need to use, IdTokenActivity.java or RestApiActivity.java ?
IdTokenActivity.java aims at retrieving an id_token. The id_token is a JWT token designed to be sent to a backend to authenticate the user as a real (trusted) Google user. You can find more information about the flow for the backend here.
RestApiActivity.java is used to consume Google API which is what you are trying to do.
How can I use the sample code to access Youtube API?
Here are the steps :
Go to Google Signin setup for Android, download google-services.json and place it in your app folder
in google developer console enable Youtube Data API
add the following to app build.gradle :
compile 'com.google.android.gms:play-services-auth:10.0.1'
compile 'com.google.api-client:google-api-client-android:1.22.0' exclude module: 'httpclient'
compile 'com.google.apis:google-api-services-youtube:v3-rev182-1.22.0'
with apply plugin: 'com.google.gms.google-services' to the bottom of your file
update the following to your top level build.gradle :
dependencies {
classpath 'com.google.gms:google-services:3.0.0'
}
Include the RestApiActivity.java in your project and update the following :
// Scope for reading user's contacts
private static final String YOUTUBE_SCOPE = "https://www.googleapis.com/auth/youtube";
...
// Configure sign-in to request the user's ID, email address, basic profile,
// and readonly access to contacts.
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestScopes(new Scope(YOUTUBE_SCOPE))
.requestEmail()
.build();
and when the client is authenticated (in handleSignInResult) , request the subscription list as following :
/**
* AsyncTask that uses the credentials from Google Sign In to access Youtube subscription API.
*/
private class GetSubscriptionTask extends AsyncTask<Account, Void, List<Subscription>> {
#Override
protected void onPreExecute() {
showProgressDialog();
}
#Override
protected List<Subscription> doInBackground(Account... params) {
try {
GoogleAccountCredential credential = GoogleAccountCredential.usingOAuth2(
RestApiActivity.this,
Collections.singleton(YOUTUBE_SCOPE));
credential.setSelectedAccount(params[0]);
YouTube youtube = new YouTube.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)
.setApplicationName("Google Sign In Quickstart")
.build();
SubscriptionListResponse connectionsResponse = youtube
.subscriptions()
.list("snippet")
.setChannelId("UCfyuWgCPu5WneQwuLBWd7Pg")
.execute();
return connectionsResponse.getItems();
} catch (UserRecoverableAuthIOException userRecoverableException) {
Log.w(TAG, "getSubscription:recoverable exception", userRecoverableException);
startActivityForResult(userRecoverableException.getIntent(), RC_RECOVERABLE);
} catch (IOException e) {
Log.w(TAG, "getSubscription:exception", e);
}
return null;
}
#Override
protected void onPostExecute(List<Subscription> subscriptions) {
hideProgressDialog();
if (subscriptions != null) {
Log.d(TAG, "subscriptions : size=" + subscriptions.size());
// Get names of all connections
for (int i = 0; i < subscriptions.size(); i++) {
Log.v(TAG, "subscription : " + subscriptions.get(i).getId());
}
} else {
Log.d(TAG, "subscriptions: null");
mDetailTextView.setText("None");
}
}
}
which is launched in lieu of GetContacts with :
new GetSubscriptionTask().execute(mAccount);
You can find a complete example here

YouTube API v3 Not Displaying Exceptions

I just started using YouTube API for Java and I'm having a tough time trying to figure out why things don't work since exception/stack trace is no where to be found. What I'm trying to do is to get list of videos uploaded by current user.
GoogleTokenResponse tokenFromExchange = new GoogleTokenResponse();
tokenFromExchange.setAccessToken(accessToken);
GoogleCredential credential = new GoogleCredential.Builder().setJsonFactory(JSON_FACTORY).setTransport(TRANSPORT).build();
credential.setFromTokenResponse(tokenFromExchange);
YouTube.Channels.List channelRequest = youtube.channels().list("contentDetails");
channelRequest.setMine(true);
channelRequest.setFields("items/contentDetails,nextPageToken,pageInfo");
ChannelListResponse channelResult = channelRequest.execute();
I don't see anything wrong with this code and also tried removing multiple things, but still not able to get it to work. Please let me know if you have run into a similar issue. The version of client library I'm using is v3-rev110-1.18.0-rc.

YouTube API has some working code and you can use it.
public static YouTubeService service;
public static String USER_FEED = "http://gdata.youtube.com/feeds/api/users/";
public static String CLIENT_ID = "...";
public static String DEVELOPER_KEY = "...";
public static int getVideoCountOf(String uploader) {
try {
service = new YouTubeService(CLIENT_ID, DEVELOPER_KEY);
String uploader = "UCK-H1e0S8jg-8qoqQ5N8jvw"; // sample user
String feedUrl = USER_FEED + uploader + "/uploads";
VideoFeed videoFeed = service.getFeed(new URL(feedUrl), VideoFeed.class);
return videoFeed.getTotalResults();
} catch (Exception ex) {
Logger.getLogger(YouTubeCore.class.getName()).log(Level.SEVERE, null, ex);
}
return 0;
}
This simple give you the number of videos a user has. You can read through videoFeed using printEntireVideoFeed prepared on their api page.