Removed views initialization in Kotlin SignInActivity

.idea/kotlinc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="KotlinCommonCompilerArguments">
+    <option name="errors">
+      <ArgumentParseErrors />
+    </option>
+  </component>
+</project>
\ No newline at end of file

app/build.gradle

@@ -22,7 +22,7 @@ dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation 'com.android.support:appcompat-v7:28.0.0-rc02'
     implementation 'com.android.support.constraint:constraint-layout:1.1.3'
-    implementation "org.jetbrains.kotlin:kotlin-reflect:1.2.30"
+    implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
 
     implementation 'com.google.firebase:firebase-core:16.0.3'
     implementation 'com.google.firebase:firebase-database:16.0.1'
@@ -35,4 +35,5 @@ dependencies {
 }
 
 apply plugin: 'com.google.gms.google-services'
-apply plugin: 'kotlin-android'
\ No newline at end of file
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
\ No newline at end of file

app/src/main/java/com/paktalin/vocabularynotebook/SignInActivity.kt

@@ -5,31 +5,23 @@ import android.support.v7.app.AppCompatActivity
 import android.os.Bundle
 import android.text.TextUtils
 import android.util.Log
-import android.view.View
-import android.widget.Button
-import android.widget.EditText
 import android.widget.Toast
 import com.google.android.gms.signin.SignIn
 
 import com.google.firebase.auth.FirebaseAuth
+import kotlinx.android.synthetic.main.activity_sign_in.*
 
 class SignInActivity : AppCompatActivity() {
 
-    private var mEmailEt: EditText? = null
-    private var mPasswordEt: EditText? = null
-    private var mSignInBtn: Button? = null
-    private var mSignUpBtn: Button? = null
-
     private var mAuth: FirebaseAuth? = null
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_sign_in)
 
-        initializeViews()
         mAuth = FirebaseAuth.getInstance()
-        mSignInBtn!!.setOnClickListener({ signIn() })
-        mSignUpBtn!!.setOnClickListener({ signUp() })
+        btnSignIn!!.setOnClickListener({ signIn() })
+        btnSignUp!!.setOnClickListener({ signUp() })
     }
 
     override fun onStart() {
@@ -38,16 +30,9 @@ class SignInActivity : AppCompatActivity() {
         if (currentUser != null) startUserActivity()
     }
 
-    private fun initializeViews() {
-        mEmailEt = findViewById(R.id.email)
-        mPasswordEt = findViewById(R.id.password)
-        mSignInBtn = findViewById(R.id.btn_sign_in)
-        mSignUpBtn = findViewById(R.id.btn_sign_up)
-    }
-
     private fun signIn() {
-        val email = mEmailEt!!.text.toString()
-        val password = mPasswordEt!!.text.toString()
+        val email = etEmail!!.text.toString()
+        val password = etPassword!!.text.toString()
 
         if (fieldsNotEmpty(email, password)) {
             mAuth!!.signInWithEmailAndPassword(email, password)
@@ -64,8 +49,8 @@ class SignInActivity : AppCompatActivity() {
     }
 
     private fun signUp() {
-        val email = mEmailEt!!.text.toString()
-        val password = mPasswordEt!!.text.toString()
+        val email = etEmail!!.text.toString()
+        val password = etPassword!!.text.toString()
 
         if (fieldsNotEmpty(email, password)) {
             mAuth!!.createUserWithEmailAndPassword(email, password)

app/src/main/res/layout/activity_sign_in.xml

@@ -8,7 +8,7 @@
     tools:context=".SignInActivity">
 
     <EditText
-        android:id="@+id/email"
+        android:id="@+id/etEmail"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginBottom="8dp"
@@ -20,14 +20,14 @@
         android:ems="10"
         android:hint="@string/email_hint"
         android:inputType="textEmailAddress"
-        app:layout_constraintBottom_toTopOf="@+id/password"
+        app:layout_constraintBottom_toTopOf="@+id/etPassword"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintVertical_chainStyle="packed" />
 
     <EditText
-        android:id="@+id/password"
+        android:id="@+id/etPassword"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginBottom="8dp"
@@ -39,13 +39,13 @@
         android:ems="10"
         android:hint="@string/password_hint"
         android:inputType="textPassword"
-        app:layout_constraintBottom_toTopOf="@+id/btn_sign_in"
+        app:layout_constraintBottom_toTopOf="@+id/btnSignIn"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/email" />
+        app:layout_constraintTop_toBottomOf="@+id/etEmail" />
 
     <Button
-        android:id="@+id/btn_sign_in"
+        android:id="@+id/btnSignIn"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginBottom="8dp"
@@ -56,13 +56,13 @@
         android:layout_marginTop="8dp"
         android:text="@string/sign_in_text"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toStartOf="@id/btn_sign_up"
+        app:layout_constraintEnd_toStartOf="@id/btnSignUp"
         app:layout_constraintHorizontal_chainStyle="packed"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/password" />
+        app:layout_constraintTop_toBottomOf="@+id/etPassword" />
 
     <Button
-        android:id="@+id/btn_sign_up"
+        android:id="@+id/btnSignUp"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginEnd="8dp"
@@ -70,8 +70,8 @@
         android:layout_marginRight="8dp"
         android:layout_marginStart="8dp"
         android:text="Sign Up"
-        app:layout_constraintBottom_toBottomOf="@+id/btn_sign_in"
+        app:layout_constraintBottom_toBottomOf="@+id/btnSignIn"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toEndOf="@+id/btn_sign_in"
-        app:layout_constraintTop_toTopOf="@+id/btn_sign_in" />
+        app:layout_constraintStart_toEndOf="@+id/btnSignIn"
+        app:layout_constraintTop_toTopOf="@+id/btnSignIn" />
 </android.support.constraint.ConstraintLayout>
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