get UserID

android/canonical/app/src/main/java/com/google/samples/quickstart/canonical/MainActivity.kt

@@ -1,16 +1,44 @@
 package com.google.samples.quickstart.canonical
 
+import android.content.Context
+import android.content.Intent
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import android.util.AttributeSet
+import android.util.Log
+import android.view.View
+import android.widget.Button
 import androidx.fragment.app.FragmentTransaction
+import com.google.android.gms.auth.api.signin.GoogleSignIn
+import com.google.android.gms.auth.api.signin.GoogleSignInClient
+import com.google.android.gms.auth.api.signin.GoogleSignInOptions
+import com.google.android.gms.common.SignInButton
+import com.google.android.gms.common.api.ApiException
 import com.google.android.material.bottomnavigation.BottomNavigationView
+import com.google.android.material.snackbar.Snackbar
+import com.google.firebase.auth.FirebaseAuth
+import com.google.firebase.auth.GoogleAuthProvider
 
 class MainActivity : AppCompatActivity() {
+  private lateinit var mGoogleSignInClient: GoogleSignInClient
+  private lateinit var auth: FirebaseAuth
 
-  override fun onCreate(savedInstanceState: Bundle?) {
-    super.onCreate(savedInstanceState)
-    setContentView(R.layout.activity_main)
+  private fun googleSignInInit() {
+    val gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
+      .requestIdToken(getString(R.string.default_web_client_id))
+      .requestEmail()
+      .build()
+
+    mGoogleSignInClient = GoogleSignIn.getClient(this, gso)
+  }
 
+  private fun signIn() {
+    auth = FirebaseAuth.getInstance()
+    val signInIntent = mGoogleSignInClient.signInIntent
+    startActivityForResult(signInIntent, RC_SIGN_IN)
+  }
+
+  private fun setupNavigationBar() {
     val runFragment = RunFragment()
     supportFragmentManager
       .beginTransaction()
@@ -57,6 +85,78 @@ class MainActivity : AppCompatActivity() {
     }
   }
 
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+    setContentView(R.layout.activity_main)
+
+    googleSignInInit()
+    setupNavigationBar()
+  }
+
+  override fun onStart() {
+    super.onStart()
+    val account = GoogleSignIn.getLastSignedInAccount(this)
+    if (account == null) {
+      setContentView(R.layout.login_in_page)
+
+      findViewById<SignInButton>(R.id.sign_in_button).setOnClickListener {
+        signIn()
+      }
+
+    }
+  }
+
+  override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+    super.onActivityResult(requestCode, resultCode, data)
+
+    // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
+    if (requestCode == RC_SIGN_IN) {
+      val task = GoogleSignIn.getSignedInAccountFromIntent(data)
+      if (task.isSuccessful) {
+        try {
+          // Google Sign In was successful, authenticate with Firebase
+          val account = task.getResult(ApiException::class.java)!!
+          Log.d("MainActivity-Login", "firebaseAuthWithGoogle:" + account.id)
+          firebaseAuthWithGoogle(account.idToken!!)
+          setContentView(R.layout.activity_main)
+          setupNavigationBar()
+        } catch (e: ApiException) {
+          // Google Sign In failed, update UI appropriately
+          Log.w("MainActivity-Login", "Google sign in failed", e)
+          // ...
+        }
+      } else {
+        Log.w("MainActivity-Login", "Google sign in unsuccessful")
+      }
+
+    }
+  }
+
+  private fun firebaseAuthWithGoogle(idToken: String) {
+    val credential = GoogleAuthProvider.getCredential(idToken, null)
+    auth.signInWithCredential(credential)
+      .addOnCompleteListener(this) { task ->
+        if (task.isSuccessful) {
+          // Sign in success, update UI with the signed-in user's information
+          Log.d("firebaseAuthWithGoogle", "signInWithCredential:success")
+          val user = auth.currentUser
+        } else {
+          // If sign in fails, display a message to the user.
+          Log.w("firebaseAuthWithGoogle", "signInWithCredential:failure", task.exception)
+          // ...
+        }
+
+        // ...
+      }
+  }
+
+
+
+  companion object {
+    private const val RC_SIGN_IN = 0
+  }
+
+
 
 
 }

android/canonical/app/src/main/java/com/google/samples/quickstart/canonical/MeFragment.kt

@@ -1,11 +1,15 @@
 package com.google.samples.quickstart.canonical
 
 import android.os.Bundle
+import android.util.Log
 import androidx.fragment.app.Fragment
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import com.google.android.gms.auth.api.signin.GoogleSignIn
+import com.google.android.gms.auth.api.signin.GoogleSignInClient
 import com.google.android.gms.auth.api.signin.GoogleSignInOptions
+import com.google.firebase.auth.FirebaseAuth
 
 // TODO: Rename parameter arguments, choose names that match
 // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
@@ -21,6 +25,8 @@ class MeFragment : Fragment() {
     // TODO: Rename and change types of parameters
     private var param1: String? = null
     private var param2: String? = null
+    private lateinit var mAuth : FirebaseAuth
+    private lateinit var mGoogleSignInClient : GoogleSignInClient
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -34,9 +40,12 @@ class MeFragment : Fragment() {
 //            .requestIdToken(getString(R.string.default_web_client_id))
 //            .requestEmail()
 //            .build()
-
+//
+//        mGoogleSignInClient = GoogleSignIn.getClient(this.context!!, gso)
+//        mAuth = FirebaseAuth.getInstance()
     }
 
+
     override fun onCreateView(
         inflater: LayoutInflater, container: ViewGroup?,
         savedInstanceState: Bundle?
@@ -45,6 +54,16 @@ class MeFragment : Fragment() {
         return inflater.inflate(R.layout.fragment_me, container, false)
     }
 
+    override fun onStart() {
+        super.onStart()
+        val account = GoogleSignIn.getLastSignedInAccount(this.context)
+        account?.let {
+            Log.i("MeFragment", "No login")
+        } ?.run {
+            Log.i("MeFragment", "Already login")
+        }
+    }
+
     companion object {
         /**
          * Use this factory method to create a new instance of

android/canonical/app/src/main/res/layout/fragment_me.xml

@@ -17,13 +17,4 @@
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
-    <com.google.android.gms.common.SignInButton
-        android:id="@+id/sign_in_button"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_marginBottom="40dp"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent" />
-
 </androidx.constraintlayout.widget.ConstraintLayout>

android/canonical/app/src/main/res/layout/login_in_page.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MeFragment">
+
+    <!-- TODO: Update blank fragment layout -->
+    <TextView
+        android:id="@+id/textView"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:gravity="center"
+        android:text="This is Login Page"
+        android:textSize="30sp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.google.android.gms.common.SignInButton
+        android:id="@+id/sign_in_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="40dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>