Google Signing snippet code

Login.java

/*
	<uses-permission android:name="android.permission.INTERNET" />
    	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    	<uses-permission android:name="android.permission.GET_ACCOUNTS" />
	<uses-permission android:name="android.permission.USE_CREDENTIALS" />
	
	build.gradle
	compile 'com.google.android.gms:play-services-auth:9.0.+'
	 
	Release SHA1 :keytool -list -v -keystore path_file.jks  -alias Key_Alias_Here -storepass Key_store_Password_Here -keypass Key_Password_Here
        example(Window) keytool -list -v -keystore "%USERPROFILE%\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android
*/


public class Login extends AppCompatActivity {

    private SignInButton googleSignInButton;
    private GoogleSignInOptions gso;
    private GoogleApiClient mGoogleApiClient;

    private int RC_SIGN_IN = 100;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
       /***************Google Signing**************/
        gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN).requestEmail().build();
        googleSignInButton = (SignInButton) findViewById(R.id.sign_in_button);
        googleSignInButton.setSize(SignInButton.SIZE_WIDE);
        googleSignInButton.setScopes(gso.getScopeArray());
        //Initializing google api client
        mGoogleApiClient = new GoogleApiClient.Builder(this).enableAutoManage(this, new GoogleApiClient.OnConnectionFailedListener() {@Override public void onConnectionFailed(ConnectionResult connectionResult) {}} /* OnConnectionFailedListener */).addApi(Auth.GOOGLE_SIGN_IN_API, gso).build();
        googleSignInButton.setOnClickListener(new View.OnClickListener() {@Override public void onClick(View v) {Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);startActivityForResult(signInIntent, RC_SIGN_IN);}});
        /**************Google Signing ENDS*************/
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //If signin
        if (requestCode == RC_SIGN_IN) {
            GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            handleGoogleSignInResult(result);
        }
    }

    //After the signing we are calling this function
    private void handleGoogleSignInResult(GoogleSignInResult result) {//If the login succeed
        if (result.isSuccess()) {
            GoogleSignInAccount acct = result.getSignInAccount();
            String name = acct.getDisplayName();
            String email = acct.getEmail();
            String avatar = acct.getPhotoUrl().toString();
            
        } else {
            //If login fails
            Toast.makeText(this, "Login Failed", Toast.LENGTH_LONG).show();
        }
    }
}