Post 4: Android: Android Login With Google Plus using Android Studio

Here we will show how to create a Google+ login Account for your Android application Using Android Studio:-

First you have to launch your Android Studio  and then enter into the Configure 

 

Here go for SDK Manager to check whether all the tools required for Google+ app is installed or not

 

Check you have any update for the Android SDK Tools, and Android SDK Platform tools if any there means just select them and Scroll down in search of Extras.

Google+ is a part of Google play services API hence you have Download the Google Play services in SDK manager

Now Create a new Project

-> Give the Application name for your project that you want and click on Next

->Choose the minimum SDK that you want for your application and click Next

->Choose the blank activity and hit on Next

->Choose the Activity Name that is suitable for your application but better to    choose the default activity

Download the Google Play services using Android SDK manger and add dependency to your build.gradle file

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dependencies {     .     .     compile 'com.google.android.gms:play-services:7.5.0' }

Getting the SHA-1 fingerprint which we have to give in Google Developers Console.

Java keytool is used to generate SHA-1 fingerprint. Open your command prompt and execute the following command to generate SHA-1 fingerprint and for passoword enter android if prompted.

For Linux or Mac OS:

1	keytool -list -v -keystore ~/.android/debug.keystore -alias androiddebugkey -storepass android -keypass android

For Windows:

1	keytool -list -v -keystore "%USERPROFILE%\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android

Now you will find the generated SHA-1 fingerprint in your terminal

Creating your project in  Google Developers Console.

To authenticate and communicate with the Google+ APIs, you must create a Google Developers Console project where you have to enable the Google+ API and create an OAuth 2.0 Client ID.

3.1. Goto Google Developers Console. and create a new project

3.2. Once you are done with creating a project, Click on API’s under API’s and Auth section. Search for the Google+ API and select the one which i have shown in the below image.

3.3. Enable the Google+ API by selecting the Enable API Button available.

3.4.After enabling goto the Credentials section under the API and Create a new Client ID.

3.5. Select the Installed Application as the type and configure consent screen

3.6. Now Fill out the package name of your project, paste the SHA1 finger print, enable the Deep Linking option to activate interactive posts and all the other parameters as shown in the image below .

Click on the create Client ID button and now you are done with creating your project in Google developer console.

Step 4: Declare permissions to your mainfest file.

Add a meta-data tag as a child of the application tag to declare the version of Google Play services you are using

1	<meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />

 To access Google+ APIs:

1	<uses-permission android:name="android.permission.INTERNET" />

 To retrieve the account name (email) as part of sign-in:

1	<uses-permission android:name="android.permission.GET_ACCOUNTS" />

 To retrieve OAuth 2.0 tokens or invalidate tokens to disconnect a user. This disconnect option is required to comply with the Google+ Sign-In developer policies:

1	<uses-permission android:name="android.permission.USE_CREDENTIALS" />

Finally, This is how your manifest file will after adding meta-data and all the permissions

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<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.androidsources.googlepluslogin" >     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.GET_ACCOUNTS" />     <uses-permission android:name="android.permission.USE_CREDENTIALS" />     <application         android:allowBackup="true"         android:icon="@mipmap/ic_launcher"         android:label="@string/app_name"         android:theme="@style/AppTheme" >         <activity             android:name="com.androidsources.googlepluslogin.MainActivity"             android:label="@string/app_name"             android:screenOrientation="portrait" >             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                 <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>         <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />     </application> </manifest>

eate a class MainActivity.java where we are going to do all our stuff for Google+ Login

1. Your class must implement GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener and override all the methods.
2. GoogleApiClient is used to communicate with the Google+ API and becomes functional after the asynchronous connection has been established with the service.
3. In your OnCreate() method build a GoogleApiClient that uses the desired api.
4. While building the GoogleApiClient in onCreate(),  If you need access to the user’s identity, social graph and the ability to write app activities, set the scope to PLUS_LOGIN (or) If you just need access to basic profile information, set the scope to profile.
5. In your onStart() method start connecting the GoogleApiClient.
6. On the Sucessfull connection OnConnected() method is called where we will be using thePlus.PeopleApi.getCurrentPerson method to request profile information the currently signed in user.
7. When the GoogleApiClient object is unable to establish a connection onConnectionFailed() is called, where you are passed a ConnectionResult that can be used to resolve the error.
8. Google Play services will trigger the onConnectionSuspended callback if our Activity loses its service connection. Here, We will be trying to reconnect the GoogleApiClient.
9. Dont forget to disconnect the GoogleApiClient connection in onStop() method else lot of resources will be wasted.

MainActivity.java

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package com.androidsources.googlepluslogin;   import android.content.Intent; import android.content.IntentSender.SendIntentException; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast;   import com.google.android.gms.common.ConnectionResult; import com.google.android.gms.common.GooglePlayServicesUtil; import com.google.android.gms.common.SignInButton; import com.google.android.gms.common.api.GoogleApiClient; import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener; import com.google.android.gms.plus.Plus; import com.google.android.gms.plus.model.people.Person;   public class MainActivity extends AppCompatActivity implements OnClickListener,         GoogleApiClient.ConnectionCallbacks, OnConnectionFailedListener {       /* Request code used to invoke sign in user interactions. */     private static final int RC_SIGN_IN = 0;       /* Client used to interact with Google APIs. */     private GoogleApiClient mGoogleApiClient;       /* A flag indicating that a PendingIntent is in progress and prevents    * us from starting further intents.    */     private boolean mIntentInProgress;       private boolean mShouldResolve;       /*finding connection result*/     private ConnectionResult connectionResult;       private SignInButton signInButton;     private Button signOutButton;     private TextView tvName, tvMail, tvNotSignedIn;     private LinearLayout viewContainer;       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);           signInButton = (SignInButton) findViewById(R.id.sign_in_button);         signOutButton = (Button) findViewById(R.id.sign_out_button);         tvName = (TextView) findViewById(R.id.tvName);         tvMail = (TextView) findViewById(R.id.tvMail);         tvNotSignedIn = (TextView) findViewById(R.id.notSignedIn_tv);         viewContainer = (LinearLayout) findViewById(R.id.text_view_container);             Toolbar toolBar = (Toolbar) findViewById(R.id.toolbar);         setSupportActionBar(toolBar);           signInButton.setOnClickListener(this);         signOutButton.setOnClickListener(this);           //Builg GoogleApiClient         mGoogleApiClient = new GoogleApiClient.Builder(this)                 .addConnectionCallbacks(this)                 .addOnConnectionFailedListener(this)                 .addApi(Plus.API)                 .addScope(Plus.SCOPE_PLUS_LOGIN)                 .build();       }       protected void onStart() {         super.onStart();         //connect GoogleApiClient         mGoogleApiClient.connect();     }       protected void onStop() {         super.onStop();         //disconnect GoogleApiClient         if (mGoogleApiClient.isConnected()) {             mGoogleApiClient.disconnect();         }     }       /*     Used for resolving errors during signIn     */     private void resolveSignInError() {         if (connectionResult.hasResolution()) {             try {                 mIntentInProgress = true;                 connectionResult.startResolutionForResult(this, RC_SIGN_IN);             } catch (SendIntentException e) {                 mIntentInProgress = false;                 mGoogleApiClient.connect();             }         }     }       /*     When the GoogleApiClient object is unable to establish a connection onConnectionFailed() is called      */     @Override     public void onConnectionFailed(ConnectionResult result) {         if (!result.hasResolution()) {             GooglePlayServicesUtil.getErrorDialog(result.getErrorCode(), this,                     0).show();             return;         }           if (!mIntentInProgress) {               connectionResult = result;               if (mShouldResolve) {                   resolveSignInError();             }         }       }       /*     onConnectionFailed() was started with startIntentSenderForResult and the code RC_SIGN_IN,     we can capture the result inside Activity.onActivityResult.      */     @Override     protected void onActivityResult(int requestCode, int responseCode,                                     Intent intent) {         if (requestCode == RC_SIGN_IN) {             if (responseCode != RESULT_OK) {                 mShouldResolve = false;             }               mIntentInProgress = false;               if (!mGoogleApiClient.isConnecting()) {                 mGoogleApiClient.connect();             }         }     }       /*     on the successfull connection onConnected is called      */     @Override     public void onConnected(Bundle arg0) {         mShouldResolve = false;         try {             if (Plus.PeopleApi.getCurrentPerson(mGoogleApiClient) != null) {                 Person person = Plus.PeopleApi                         .getCurrentPerson(mGoogleApiClient);                 String personName = person.getDisplayName();                 String email = Plus.AccountApi.getAccountName(mGoogleApiClient);                   tvName.setText(personName);                 tvMail.setText(email);                   Toast.makeText(getApplicationContext(),                         "You are Logged In " + personName, Toast.LENGTH_LONG).show();             } else {                 Toast.makeText(getApplicationContext(),                         "Couldnt Get the Person Info", Toast.LENGTH_SHORT).show();             }         } catch (Exception e) {             e.printStackTrace();         }         signOutUI();       }       /*     sign out UI      */     private void signOutUI() {         signInButton.setVisibility(View.GONE);         tvNotSignedIn.setVisibility(View.GONE);         signOutButton.setVisibility(View.VISIBLE);         viewContainer.setVisibility(View.VISIBLE);     }       /*     SignIn UI      */     private void signInUI() {         signInButton.setVisibility(View.VISIBLE);         tvNotSignedIn.setVisibility(View.VISIBLE);         signOutButton.setVisibility(View.GONE);         viewContainer.setVisibility(View.GONE);     }          /*     called when the connection is suspended      */     @Override     public void onConnectionSuspended(int arg0) {         mGoogleApiClient.connect();         signInUI();     }       @Override     public boolean onCreateOptionsMenu(Menu menu) {         // Inflate the menu; this adds items to the action bar if it is present.         getMenuInflater().inflate(R.menu.menu_main, menu);         return true;     }         @Override     public void onClick(View v) {         switch (v.getId()) {             case R.id.sign_in_button:                 onSignInClicked();                 break;             case R.id.sign_out_button:                 onSignOutClicked();                 break;         }     }       /*     called when signIn Button is clicked      */     private void onSignInClicked() {         if (!mGoogleApiClient.isConnecting()) {             mShouldResolve = true;             resolveSignInError();         }     }       /*     called when sign out button is clicked      */     private void onSignOutClicked() {         if (mGoogleApiClient.isConnected()) {             Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);             mGoogleApiClient.disconnect();             signInUI();         }     }   }

 Step 6: Create activity_main.xml which will contain our login and logout layout .

This will be the code for signIn button:

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<com.google.android.gms.common.SignInButton         android:id="@+id/sign_in_button"         android:layout_width="match_content"         android:layout_height="wrap_content" />

 activity_main.xml

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical"     tools:context=".MainActivity">     <!--including the toobar-->     <include         layout="@layout/toolbar" />       <LinearLayout         android:id="@+id/text_view_container"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:layout_marginTop="100dp"         android:layout_marginBottom="20dp"         android:orientation="vertical"         android:paddingLeft="16dp"         android:paddingRight="16dp"         android:visibility="gone"         android:weightSum="3">           <TextView             android:id="@+id/tvName"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:padding="5dp"             android:textSize="20dp" />           <TextView             android:id="@+id/tvMail"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:padding="5dp"             android:textSize="18dp" />       </LinearLayout>       <Button         android:id="@+id/sign_out_button"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:layout_marginBottom="10dp"         android:background="@android:color/holo_red_light"         android:layout_marginLeft="19dp"         android:layout_marginRight="19dp"         android:text="LOGOUT"         android:textColor="#fff"         android:textStyle="bold"         android:visibility="gone" />       <TextView         android:id="@+id/notSignedIn_tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="center_horizontal"         android:layout_marginTop="100dp"         android:layout_marginBottom="30dp"         android:text="You are not Signed In"         android:textSize="20sp" />       <com.google.android.gms.common.SignInButton         android:id="@+id/sign_in_button"         android:layout_width="229dp"         android:layout_height="wrap_content"         android:layout_gravity="center_horizontal" />   </LinearLayout>

Thats it folks. You are done with Google+ Login. Follow me on GITHUB