Add dark and light theme with corresponding settings activity and BaseActivity class

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

@@ -14,7 +14,6 @@
         android:layout_marginTop="8dp"
         android:layout_marginEnd="48dp"
         android:fontFamily="sans-serif-medium"
-        android:text="gameTitle"
         android:textAlignment="center"
         android:textSize="24sp"
         android:textStyle="bold"
@@ -30,7 +29,6 @@
         android:layout_marginTop="56dp"
         android:layout_marginEnd="48dp"
         android:fontFamily="sans-serif-smallcaps"
-        android:text="titleID"
         android:textAlignment="center"
         android:textSize="24sp"
         android:textStyle="bold"
@@ -53,7 +51,7 @@
             android:layout_marginStart="140dp"
             android:layout_marginTop="30dp"
             android:layout_marginEnd="141dp"
-            android:contentDescription="Game Icon"
+            android:contentDescription="game Icon"
             app:srcCompat="@drawable/ic_games_black_24dp" />
 
     </LinearLayout>

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

@@ -36,7 +36,6 @@
                     android:paddingEnd="4dp"
                     android:paddingRight="10dp"
                     android:paddingBottom="4dp"
-                    android:text="US"
                     android:textAlignment="center"
                     android:textColor="@color/colorOnSecondary"
                     app:layout_constraintBottom_toBottomOf="parent"
@@ -54,7 +53,6 @@
                     android:marqueeRepeatLimit="marquee_forever"
                     android:scrollHorizontally="true"
                     android:singleLine="true"
-                    android:text="Placeholder"
                     android:textAlignment="viewStart"
                     android:textAppearance="?android:attr/textAppearanceListItem"
                     android:textColor="@color/colorOnPrimary"
@@ -67,6 +65,7 @@
                     android:id="@+id/imageView"
                     android:layout_width="62dp"
                     android:layout_height="56dp"
+                    android:contentDescription="game icon"
                     app:layout_constraintBottom_toBottomOf="parent"
                     app:layout_constraintStart_toStartOf="parent"
                     app:layout_constraintTop_toTopOf="parent"
@@ -79,7 +78,6 @@
                     android:layout_marginStart="8dp"
                     android:background="@drawable/rect_red"
                     android:padding="4dp"
-                    android:text="3.60"
                     android:textAlignment="center"
                     android:textColor="@color/colorOnSecondary"
                     app:layout_constraintBottom_toBottomOf="parent"
@@ -90,7 +88,6 @@
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
                     android:padding="4dp"
-                    android:text="2020-5-5"
                     android:textColor="@color/colorOnSecondary"
                     app:layout_constraintBottom_toBottomOf="parent"
                     app:layout_constraintEnd_toEndOf="parent" />

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

@@ -0,0 +1,14 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:baselineAligned="false"
+    android:orientation="vertical">
+
+    <include layout="@layout/appbar" />
+
+    <FrameLayout
+        android:id="@+id/settings"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</LinearLayout>

app/src/main/res/menu/toolbar_main.xml

@@ -4,7 +4,7 @@
     <item
         android:id="@+id/action_settings"
         android:icon="@drawable/ic_settings"
+        android:title="@string/title_activity_settings"
         app:iconTint="?attr/colorOnPrimary"
-        android:title="settings"
         app:showAsAction="ifRoom" />
 </menu>

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

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string-array name="app_theme">
+        <item>Light</item>
+        <item>Dark</item>
+        <item>Use System Default</item>
+    </string-array>
+    <string-array name="app_theme_val">
+        <item>0</item>
+        <item>1</item>
+        <item>2</item>
+    </string-array>
+</resources>

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

@@ -1,3 +1,4 @@
 <resources>
     <string name="app_name">NPS Browser</string>
+    <string name="title_activity_settings">Settings</string>
 </resources>

app/src/main/res/xml/root_preferences.xml

@@ -0,0 +1,12 @@
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <PreferenceCategory android:title="Customization">
+
+        <com.illusionware.npsbrowser.ThemePreference
+            android:defaultValue="2"
+            android:entries="@array/app_theme"
+            android:entryValues="@array/app_theme_val"
+            android:key="app_theme"
+            android:title="Theme" />
+    </PreferenceCategory>
+</PreferenceScreen>