Added custom toolbar to layout

app/src/main/java/me/vadik/knigopis/MainActivity.kt

@@ -5,6 +5,7 @@ import android.support.design.widget.BottomNavigationView
 import android.support.v7.app.AppCompatActivity
 import android.support.v7.widget.LinearLayoutManager
 import android.support.v7.widget.RecyclerView
+import android.support.v7.widget.Toolbar
 import me.vadik.knigopis.model.Book
 import me.vadik.knigopis.model.User
 import retrofit2.Call
@@ -15,6 +16,7 @@ class MainActivity : AppCompatActivity() {
 
   private val api by lazy { app().retrofit.create(Endpoint::class.java) }
   private val recyclerView by lazy { findViewById(R.id.recycler_view) as RecyclerView }
+  private val toolbar by lazy { findViewById(R.id.toolbar) as Toolbar }
   private val users = mutableListOf<User>()
 
   override fun onCreate(savedInstanceState: Bundle?) {
@@ -22,7 +24,7 @@ class MainActivity : AppCompatActivity() {
     setContentView(R.layout.activity_main)
     val navigation = findViewById(R.id.navigation) as BottomNavigationView
     navigation.setOnNavigationItemSelectedListener { item ->
-      supportActionBar!!.title = item.title
+      toolbar.title = item.title
       true
     }
     val adapter = UsersAdapter(users)

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

@@ -9,6 +9,18 @@
     android:orientation="vertical"
     tools:context="me.vadik.knigopis.MainActivity">
 
+    <android.support.design.widget.AppBarLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:theme="@style/AppBarTheme">
+
+        <android.support.v7.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"/>
+
+    </android.support.design.widget.AppBarLayout>
+
     <android.support.v7.widget.RecyclerView
         android:id="@+id/recycler_view"
         android:layout_width="match_parent"

app/src/main/res/values/colors.xml

@@ -3,4 +3,5 @@
     <color name="colorPrimary">#3F51B5</color>
     <color name="colorPrimaryDark">#303F9F</color>
     <color name="colorAccent">#FF4081</color>
+    <color name="white">#FFFFFF</color>
 </resources>

app/src/main/res/values/styles.xml

@@ -1,7 +1,14 @@
 <resources>
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+
+    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
         <item name="colorPrimary">@color/colorPrimary</item>
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
     </style>
+
+    <style name="AppBarTheme">
+        <item name="actionMenuTextColor">@color/white</item>
+        <item name="titleTextColor">@color/white</item>
+        <item name="android:textColorSecondary">@color/white</item>
+    </style>
 </resources>