Google plus authentication in Android app

Posted By : Chandan Wadhwa | 29-Jun-2015

android

Google Plus Authentication Android

In this blog I am explain google plus login process and accessing other required information from google in Android Studio IDE.

Following are the required steps for accessing API key

1. Visit google developer console

2. Create App → Select APIs & auth → search Google+ API and enable it

3. From credentials tab → create new key → select android key → create

Add Google play services in your project

Open project structure → Dependencies → Add Library dependencies → Add google play services library

Add following permission in android Manifest.xml

Add following code to your Activity class

public class MainActivity extends Activity  implements
      ConnectionCallbacks, OnConnectionFailedListener
        
{
     private GoogleApiClient mGoogleApiClient;
SignInButton mGoogleSignInButton;
boolean mGoogleSignInStatus;

    
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

	if (mGoogleSignInStatus ||mFacebookSignInStatus) {
    Intent nextActivity = new Intent(getApplicationContext(), ProfileSettingActivity.class);
    startActivity(nextActivity);
}

        mGoogleApiClient = new GoogleApiClient.Builder(this)
        .addConnectionCallbacks(this)
        .addOnConnectionFailedListener(this)
        .addApi(Plus.API)
        .addScope(Plus.SCOPE_PLUS_LOGIN)
        .build();

//google plus login
mGoogleSignInButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        mGoogleSignInStatus = true;
        SharedPreferences.Editor editor = mSharedPref.edit();
        editor.putBoolean("GoogleSignInState", mGoogleSignInStatus);
        editor.commit();
        mGoogleApiClient.connect();
    }
});
  	
    }

   protected void onStart() {
    super.onStart();
    mGoogleApiClient.connect();
  }

  protected void onStop() {
    super.onStop();

    if (mGoogleApiClient.isConnected()) {
      mGoogleApiClient.disconnect();
    }
  }

Add Following to your layout.xml file to create login button

Accessing Google plus token

class GetGooglePlusToken extends AsyncTask
    {
        @Override
        protected String doInBackground(Void... params) {
            String accessToken="";
            try {
                accessToken=GoogleAuthUtil.getToken(mContext, Plus.AccountApi.getAccountName(mGoogleApiClient), "oauth2:"
                        + Scopes.PLUS_LOGIN);
                Log.d("Access Token ","Google plus Access Token "+accessToken);
            }
            catch (IOException ioException){
                Toast.makeText(getApplicationContext(), ioException.getMessage(),Toast.LENGTH_SHORT).show();
            }
            catch(UserRecoverableAuthException authExcep){
                Toast.makeText(getApplicationContext(), authExcep.getMessage(),Toast.LENGTH_SHORT).show();
            }
            catch (GoogleAuthException googleAuthException){
                Toast.makeText(getApplicationContext(), googleAuthException.getMessage(),Toast.LENGTH_SHORT).show();
            }
    return accessToken;
        }

THANKS