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I don't have a lot of experience creating Java (.aar) plugins for Unity3d, but I am attempting to setup google authentication with firebase from such a plugin. To give an example of my problem, I begin by opening a unity android application, then I run the c# code below, and get a popup on my display to sign-in with google. I then choose the correct google account, then the google intent/activity disappears, then I receive no indication that "onActivityResult" has been called. No errors occur and I am unable to to do anything with the google account information that I chose.
In the image below, I click submit -> it opens the google sign-in activity in the next picture -> then it returns back to the submit screen (closing the google sign-in activity).
I think my issue is in this line:
activity.startActivityForResult(signInIntent, RC_SIGN_IN);
The "activity" in this case is a UnityPlayerActivity sent from the c# unity code below. I think this is making it so my code is looking for an "onActivityResult" method in the C# unity code rather than the java code. Any help would be greatly appreciated. Let me know if you need any other info or screenshots. Please call me out if I am being a moron.
Here is my code for calling the Google Signin Plugin From C# & Unity3d:
AndroidJNIHelper.debug = true;
using (AndroidJavaClass activityClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer")) {
activity_context = activityClass.GetStatic<AndroidJavaObject>("currentActivity");
using (AndroidJavaClass pluginClass = new AndroidJavaClass("com.package.class")) {
if (pluginClass != null) {
GoogleSignInActivity = pluginClass.CallStatic<AndroidJavaObject>("instance");
GoogleSignInActivity.Call("SetContext", activity_context);
GoogleSignInActivity.Call("StartGoogleLogin", activity_context);
activity_context.Call("runOnUiThread", new AndroidJavaRunnable(() => {
GoogleSignInActivity.Call("ShowMessage", "You signed in as " + display_name);
Here is the code for creating the Google SignIn Activity:
public void StartGoogleLogin(UnityPlayerActivity activity) {
gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken("some url")
.requestEmail()
.build();
mGoogleSignInClient = GoogleSignIn.getClient(activity, gso);
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
activity.startActivityForResult(signInIntent, RC_SIGN_IN);
Log.d(TAG, "Activity Started; Waiting For Result");
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Log.d(TAG, "Result Received!");
if (requestCode == RC_SIGN_IN) {
Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
try {
// Google Sign In was successful
GoogleSignInAccount account = task.getResult(ApiException.class);
someMethod(account);
} catch (ApiException e) {
// Google Sign In failed, update UI appropriately
Log.d(TAG, "Google sign in failed", e);
setResult(RESULT_OK);
Thank you for your time.
Well, I solved my own problem of getting Google Authentication to work between the Android .aar plugin and Unity c#. Been working tirelessly and found some kickbutt resources.
First and foremost, I referenced the code written by a guy named cwgtech HERE.
I also went through all of his videos.
Instead of using UnitySendMessage, I was able to use a callback method similar to what CWGTech does to send a googleIdToken back to Unity and sign-in with Google into Firebase. I was also correct in thinking that my mistake was with the statement below:
activity.startActivityForResult(signInIntent, RC_SIGN_IN);
Instead of doing this, I followed CWGTech's advice and removed "activity." portion. I ran the startActivityForResult in a ResultCallback class that extends Activity. If you are still confused, dm me or comment on this post. Thanks!
Here is some of the code I used to send a callback string to Unity via a Java Proxy in written in C#. Information about writing a Java proxy can be found in the cwgtech information above. Writing the java proxy is extremely important if you want to get information to flow from Android activities to Unity C#. CWGTech explains the intricacies of java proxies way better than I could do justice.
public static final String LOGTAG = GoogleSignInActivity.TAG + "_OnResult";
public static GoogleSignInActivity.ShareStringCallback shareStringCallback;
private static final int RC_SIGN_IN = 9001;
private GoogleSignInClient mGoogleSignInClient;
private GoogleSignInOptions gso;
private CallbackManager mCallbackManager;
public void myFinish(String myresult) {
if (shareStringCallback != null) {
shareStringCallback.onLoginComplete(myresult);
shareStringCallback = null;
finish();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.i(LOGTAG, "onCreateBundle");
Intent intent = getIntent();
setContentView(R.layout.login_activity);
findViewById(R.id.buttonFacebookLogin).setOnClickListener(this);
findViewById(R.id.signInButton).setOnClickListener(this);
findViewById(R.id.buttonAnonymousSignIn).setOnClickListener(this);
/* GOOGLE SIGN-IN CODE */
public Intent StartGoogleLogin() {
Google Sign In Client Init Code Goes Here
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
return signInIntent;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
//Detects some type of result from an activity, in this case Google
String id_result = "Send This To Unity";
myFinish(id_result);
Here is a bit more code from a different java class file. The 'Login' method is called from Unity c#.
/* INTERFACES FOR CALLBACK FUNCTIONAILITY */
public interface ShareStringCallback {
public void onLoginComplete(String result);
public void Login(final ShareStringCallback callback)
mainActivity.runOnUiThread(new Runnable() {
@Override
public void run() {
try {
Log.i(TAG,"Starting Authentication");
try {
try {
Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND);
shareIntent.setClass(mainActivity,OnResultCallback.class);
OnResultCallback.shareStringCallback = callback;
mainActivity.startActivity(shareIntent);
catch (Exception e)
e.printStackTrace();
Log.i(TAG,"error sharing intent: " + e);
catch (Exception e)
e.printStackTrace();
Log.i(TAG,"Error getting Uri: " + e);
catch (Exception e)
e.printStackTrace();
Log.i(TAG,"Error writing file: " + e);
–
–
When you start a activity from UnityPlayerActivity, the onActivityResult will be called when finished, but will have its default return value. What you can do is create a new Activity in Android, and extends UnityPlayerActivity.
In Android, create a new Activity
import com.unity3d.player.UnityPlayer;
public class OverrideUnityPlayerActivity extends UnityPlayerActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
public Activity getCurrentActivity(){
return mUnityPlayer.currentActivity;
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 0) {
switch (resultCode) {
case Activity.RESULT_OK:
//do something
break;
case Activity.RESULT_CANCELED:
//do something
break;
You need to set this override activity as launch endpoint in AndroidManifest.XML
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.unity3d.player"
xmlns:tools="http://schemas.android.com/tools">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="false"
tools:replace="android:allowBackup">
<activity
android:name="com.example.unitylibrary.manager.OverrideUnityPlayerActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data android:name="app_name" android:value="app_value"/>
</activity>
</application>
</manifest>
3.Then in Unity, you can get this activity and context, also get the onActivityResult
AndroidJavaObject overridePlayerActivity;
AndroidJavaObject overrideActivity;
public void init(){
overridePlayerActivity = new AndroidJavaObject("com.example.unitylibrary.manager.OverrideUnityPlayerActivity");
overrideActivity= overridePlayerActivity.Call<AndroidJavaObject>("getCurrentActivity");
public void startAct(){
anonymousFunction.Call("StartActForRes", overrideActivity);
Hope this will solve your problem.
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