Google Plus Login Integration in Android

1.  Installing Google Play Services

Open SDK Manager and download google play services

2. Generating Google-Services.json

2.1 Find keytool can be used to generate SHA-1.

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

2.2 click on Get A Configuration File button

              

3. Creating New Project

          3.1 Open project level build.gradle(Project: GooglePlusLogin) and add...

            dependencies{
         classpath 'com.android.tools.build:gradle:2.2.3'
         classpath 'com.google.gms:google-services:3.0.0'
       }

3.2 Open app level build.gradle and add...

                compile 'com.google.android.gms:play-services-auth:9.2.1'
         compile 'com.github.bumptech.glide:glide:3.7.0'

3.3 Open string.xml File and put.....

                <string name="btn_logout_from_google">Logout from Google</string>
         <string name="btn_revoke_access">Revoke Access</string>
         <string name="loading">wait......</string>

3.4 Open Design file acrivity_main2.xml

                  <?xml version="1.0" encoding="utf-8"?>
          <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"
              android:padding="16dp"
              tools:context=".MainActivity" >

           <LinearLayout
              android:id="@+id/llProfile"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:layout_marginBottom="20dp"
              android:orientation="horizontal"
              android:weightSum="3"
               android:visibility="gone">

                 <ImageView
                 android:id="@+id/imgProfilePic"
                 android:layout_width="80dp"
                 android:layout_height="wrap_content"
                 android:layout_weight="1"/>

                 <LinearLayout
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_marginLeft="10dp"
                   android:orientation="vertical"
                   android:layout_weight="2" >

                     <TextView
                       android:id="@+id/txtName"
                       android:layout_width="wrap_content"
                       android:layout_height="wrap_content"
                       android:padding="5dp"
                       android:textSize="20dp" />

                     <TextView
                       android:id="@+id/txtEmail"
                       android:layout_width="wrap_content"
                       android:layout_height="wrap_content"
                       android:padding="5dp"
                       android:textSize="18dp" />
                    </LinearLayout>
             </LinearLayout>

             <com.google.android.gms.common.SignInButton
                 android:id="@+id/btn_sign_in"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginBottom="20dp"/>

             <Button
                 android:id="@+id/btn_sign_out"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
                 android:text="@string/btn_logout_from_google"
                 android:visibility="gone"
                 android:layout_marginBottom="10dp"/>

             <Button
                 android:id="@+id/btn_revoke_access"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
                 android:text="@string/btn_revoke_access"
                 android:visibility="gone" />

          </LinearLayout>

3.5 Open Java File Main2activity.java

package com.jainish.googlepluslogin;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.OptionalPendingResult;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;

public class Main2Activity extends AppCompatActivity implements
        View.OnClickListener,
        GoogleApiClient.OnConnectionFailedListener {

    private static final String TAG = Main2Activity.class.getSimpleName();
    private static final int RC_SIGN_IN = 007;

    private GoogleApiClient mGoogleApiClient;
    private ProgressDialog mProgressDialog;

    private SignInButton btnSignIn;
    private Button btnSignOut, btnRevokeAccess;
    private LinearLayout llProfileLayout;
    private ImageView imgProfilePic;
    private TextView txtName, txtEmail;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        btnSignIn = (SignInButton) findViewById(R.id.btn_sign_in);
        btnSignOut = (Button) findViewById(R.id.btn_sign_out);
        btnRevokeAccess = (Button) findViewById(R.id.btn_revoke_access);
        llProfileLayout = (LinearLayout) findViewById(R.id.llProfile);
        imgProfilePic = (ImageView) findViewById(R.id.imgProfilePic);
        txtName = (TextView) findViewById(R.id.txtName);
        txtEmail = (TextView) findViewById(R.id.txtEmail);

        btnSignIn.setOnClickListener(this);
        btnSignOut.setOnClickListener(this);
        btnRevokeAccess.setOnClickListener(this);

        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .build();

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .enableAutoManage(this, this)
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();

        // Customizing G+ button
        btnSignIn.setSize(SignInButton.SIZE_STANDARD);
        btnSignIn.setScopes(gso.getScopeArray());
    }


    private void signIn() {
        Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }

    private void signOut() {
        Auth.GoogleSignInApi.signOut(mGoogleApiClient).setResultCallback(
                new ResultCallback<Status>() {
                    @Override
                    public void onResult(Status status) {
                        updateUI(false);
                    }
                });
    }

    private void revokeAccess() {
        Auth.GoogleSignInApi.revokeAccess(mGoogleApiClient).setResultCallback(
                new ResultCallback<Status>() {
                    @Override
                    public void onResult(Status status) {
                        updateUI(false);
                    }
                });
    }

    private void handleSignInResult(GoogleSignInResult result) {

        Toast.makeText(getApplicationContext(),"handleSignInResult:" + result.isSuccess(),Toast.LENGTH_LONG).show();
        Log.d(TAG, "handleSignInResult:" + result.isSuccess());
        if (result.isSuccess()) {
            // Signed in successfully, show authenticated UI.
            GoogleSignInAccount acct = result.getSignInAccount();

            Log.e(TAG, "display name: " + acct.getDisplayName());

            String personName = acct.getDisplayName();
            String personPhotoUrl = acct.getPhotoUrl().toString();
            String email = acct.getEmail();

            Log.e(TAG, "Name: " + personName + ", email: " + email
                    + ", Image: " + personPhotoUrl);

            txtName.setText(personName);
            txtEmail.setText(email);
            Glide.with(getApplicationContext()).load(personPhotoUrl)
                    .thumbnail(0.5f)
                    .crossFade()
                    .diskCacheStrategy(DiskCacheStrategy.ALL)
                    .into(imgProfilePic);

            Toast.makeText(getApplicationContext(),personName,Toast.LENGTH_LONG).show();
            updateUI(true);
        } else {
            updateUI(false);
        }
    }
    @Override
    public void onClick(View v) {
        int id = v.getId();

        switch (id) {
            case R.id.btn_sign_in:
                signIn();
                break;

            case R.id.btn_sign_out:
                signOut();
                break;

            case R.id.btn_revoke_access:
                revokeAccess();
                break;
        }
    }
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == RC_SIGN_IN) {
            GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            handleSignInResult(result);
        }
    }
    @Override
    public void onStart() {
        super.onStart();

        OptionalPendingResult<GoogleSignInResult> opr = Auth.GoogleSignInApi.silentSignIn(mGoogleApiClient);
        if (opr.isDone()) {
                       Log.d(TAG, "Got cached sign-in");
            GoogleSignInResult result = opr.get();
            handleSignInResult(result);
        } else {
            showProgressDialog();
            opr.setResultCallback(new ResultCallback<GoogleSignInResult>() {
                @Override
                public void onResult(GoogleSignInResult googleSignInResult) {
                    hideProgressDialog();
                    handleSignInResult(googleSignInResult);
                }
            });
        }
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
           Log.d(TAG, "onConnectionFailed:" + connectionResult);
    }

    private void showProgressDialog() {
        if (mProgressDialog == null) {
            mProgressDialog = new ProgressDialog(this);
            mProgressDialog.setMessage(getString(R.string.loading));
            mProgressDialog.setIndeterminate(true);
        }

        mProgressDialog.show();
    }

    private void hideProgressDialog() {
        if (mProgressDialog != null && mProgressDialog.isShowing()) {
            mProgressDialog.hide();
        }
    }

    private void updateUI(boolean isSignedIn) {
        if (isSignedIn) {
            btnSignIn.setVisibility(View.GONE);
            btnSignOut.setVisibility(View.VISIBLE);
            btnRevokeAccess.setVisibility(View.VISIBLE);
            llProfileLayout.setVisibility(View.VISIBLE);
        } else {
            btnSignIn.setVisibility(View.VISIBLE);
            btnSignOut.setVisibility(View.GONE);
            btnRevokeAccess.setVisibility(View.GONE);
            llProfileLayout.setVisibility(View.GONE);
        }
    }
}

           

Output