authentication code added

Author: maciej-nowak

authentication/FirebaseAuthActivity.kt

@@ -0,0 +1,52 @@
+class FirebaseAuthActivity : AppCompatActivity() {
+
+    private lateinit var auth: FirebaseAuth
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_firebase_auth)
+        auth = FirebaseAuth.getInstance()
+
+        signUpButton.setOnClickListener { updateProfile() }
+        signInButton.setOnClickListener { changeEmail() }
+    }
+
+    override fun onStart() {
+        super.onStart()
+        if(auth.currentUser != null) {
+            //user is signed in, update UI or navigate
+        }
+    }
+
+    private fun signUp() {
+        //validate fields before
+        val email = emailEditText.getText().toString()
+        val password = passwordEditText.getText().toString()
+        auth.createUserWithEmailAndPassword(email, password).addOnCompleteListener { task ->
+            if (task.isSuccessful) {
+                //sign up success, update UI or navigate
+                val user = auth.currentUser
+                startActivity(Intent(this, ProfileActivity::class.java))
+            }
+            else {
+                //sign up fails, show error message
+            }
+        }
+    }
+
+    private fun signIn() {
+        //validate fields before
+        val email = emailEditText.getText().toString()
+        val password = passwordEditText.getText().toString()
+        auth.signInWithEmailAndPassword(email, password).addOnCompleteListener { task ->
+            if (task.isSuccessful) {
+                //sign ip success, update UI or navigate
+                val user = auth.currentUser
+                startActivity(Intent(this, ProfileActivity::class.java))
+            }
+            else {
+                //sign in fails, show error message
+            }
+        }
+    }
+}

authentication/FirebaseUIActivity.kt

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+class FirebaseUIActivity : AppCompatActivity() {
+
+    companion object {
+        const val SIGN_IN = 100
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_firebase_ui)
+
+        //check if user is already signed in
+        //if not then show sign in screen
+
+        //add available providers
+        val providers = arrayListOf(
+            AuthUI.IdpConfig.EmailBuilder().build(),
+            AuthUI.IdpConfig.PhoneBuilder().build(),
+            AuthUI.IdpConfig.GoogleBuilder().build())
+        //add more like Twitter, Facebook etc
+
+        //start sign in screen and optional customize by logo, theme and urls
+        val intent = AuthUI.getInstance()
+            .createSignInIntentBuilder()
+            .setAvailableProviders(providers)
+            .setLogo(R.drawable.logo)
+            .setTheme(R.style.AppTheme)
+            .setTosAndPrivacyPolicyUrls("http://androidcode.pl/terms", "http://androidcode.pl/privacy")
+            .build()
+        startActivityForResult(intent, SIGN_IN)
+    }
+
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        super.onActivityResult(requestCode, resultCode, data)
+        if (requestCode == SIGN_IN) {
+            val response = IdpResponse.fromResultIntent(data)
+            if (resultCode == Activity.RESULT_OK) {
+                //success, get user and do some work
+                val user = FirebaseAuth.getInstance().currentUser
+                startActivity(Intent(this, UserActivity::class.java))
+            }
+            else {
+                //fail, show some error message
+            }
+        }
+    }
+}

authentication/ProfileActivity.kt

@@ -0,0 +1,94 @@
+class ProfileActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_profile)
+        
+        showUserInfo()
+        showProfiles()
+
+        updateProfileButton.setOnClickListener { updateProfile() }
+        changeEmailButton.setOnClickListener { changeEmail() }
+        changePasswordButton.setOnClickListener { changePassword() }
+        deleteAccountButton.setOnClickListener { deleteAccount() }
+        signOutButton.setOnClickListener { signOut() }
+    }
+
+    private fun showUserInfo() {
+        val user = FirebaseAuth.getInstance().currentUser
+        user?.let {
+            var info = String()
+            info += "uid: ${user.uid}\n"
+            info += "name: ${user.displayName}\n"
+            info += "email: ${user.email}\n"
+            info += "is verified: ${user.isEmailVerified}\n"
+            info += "photoUrl: ${user.photoUrl.toString()}\n"
+            //get more info
+            userInfo.setText(info)
+        }
+    }
+
+    private fun showProfiles() {
+        val user = FirebaseAuth.getInstance().currentUser
+        user?.let {
+            for(profile in it.providerData) {
+                var info = String()
+                info += "PROVIDER: ${profile.providerId}\n"
+                info += "uid: ${profile.uid}\n"
+                info += "name: ${profile.displayName}\n"
+                //get more info
+                userProfiles.setText(info)
+            }
+        }
+    }
+
+    private fun updateProfile() {
+        val user = FirebaseAuth.getInstance().currentUser
+        val profileUpdates = UserProfileChangeRequest.Builder()
+                .setDisplayName(editText.getText().toString())
+                .setPhotoUri(Uri.parse("http://androidcode.pl/assets/img/logo.png"))
+                .build()
+
+        user?.updateProfile(profileUpdates)?.addOnCompleteListener { task ->
+            if (task.isSuccessful) {
+                //show some message and change UI
+            }
+        }
+    }
+
+    private fun changeEmail() {
+        val user = FirebaseAuth.getInstance().currentUser
+        val email = editText.getText().toString() //validate
+        user?.updateEmail(email)?.addOnCompleteListener { task ->
+            if (task.isSuccessful) {
+                //show some message and change UI
+            }
+        }
+    }
+
+    private fun changePassword() {
+        val user = FirebaseAuth.getInstance().currentUser
+        val newPassword = editText.getText().toString() //validate
+        user?.updatePassword(newPassword)?.addOnCompleteListener { task ->
+            if (task.isSuccessful) {
+                //show some message and change UI
+            }
+        }
+    }
+
+    private fun deleteAccount() {
+        val user = FirebaseAuth.getInstance().currentUser
+        user?.delete()?.addOnCompleteListener { task ->
+            if (task.isSuccessful) {
+                //show some message and change UI
+            }
+        }
+    }
+
+    private fun signOut() {
+        FirebaseAuth.getInstance().signOut()
+        finish()
+    }
+
+    //more methods
+}

authentication/README.md

@@ -0,0 +1,2 @@
+# authentication
+This is repository of http://androidcode.pl blog. It shows uses Authentication in Android. It is a part of Firebase - Authentication post in the blog.

authentication/UserActivity.kt

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+class UserActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_user)
+
+        signOutButton.setOnClickListener {
+            AuthUI.getInstance().signOut(this)
+                .addOnCompleteListener {
+                    //do something like navigate to home screen
+                }
+        }
+
+        deleteAccountButton.setOnClickListener {
+            AuthUI.getInstance().delete(this)
+                .addOnCompleteListener {
+                    //do something like navigate to home screen
+                }
+        }
+    }
+
+    //more methods
+}