Android Tutorial => Code Implementation Google SignIn

Example

In your sign-in activity's onCreate method, configure Google Sign-In to request the user data required by your app.

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

create a GoogleApiClient object with access to the Google Sign-In API and the options you specified.

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

Now When User click on Google signin button call this Function.

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

implement OnActivityResult to get the response.

 @Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
    if (requestCode == RC_SIGN_IN) {
        GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
        handleSignInResult(result);
    }
}

Last step Handle The Result and get User Data

 private void handleSignInResult(GoogleSignInResult result) {
 Log.d(TAG, "handleSignInResult:" + result.isSuccess());
 if (result.isSuccess()) {
     // Signed in successfully, show authenticated UI.
     GoogleSignInAccount acct = result.getSignInAccount();
     mStatusTextView.setText(getString(R.string.signed_in_fmt, acct.getDisplayName()));
     updateUI(true);
 } else {
     // Signed out, show unauthenticated UI.
     updateUI(false);
 }
}

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Android Google signin integration on android Code Implementation Google SignIn

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