Add support for night mode (#749)

Author: SUPERCILEX

app/src/main/AndroidManifest.xml

@@ -8,7 +8,7 @@
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
 
     <application
-        android:name=".auth.LeakCatcher"
+        android:name=".auth.FirebaseUIDemo"
         android:allowBackup="true"
         android:fullBackupContent="true"
         android:icon="@mipmap/ic_launcher"

app/src/main/java/com/firebase/uidemo/auth/LeakCatcher.java renamed to app/src/main/java/com/firebase/uidemo/auth/FirebaseUIDemo.java

@@ -2,15 +2,20 @@
 
 import android.app.Application;
 import android.content.Context;
+import android.support.v7.app.AppCompatDelegate;
 
 import com.squareup.leakcanary.LeakCanary;
 import com.squareup.leakcanary.RefWatcher;
 
-public class LeakCatcher extends Application {
+public class FirebaseUIDemo extends Application {
     private RefWatcher mRefWatcher;
 
+    static {
+        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_AUTO);
+    }
+
     public static RefWatcher getRefWatcher(Context context) {
-        return ((LeakCatcher) context.getApplicationContext()).mRefWatcher;
+        return ((FirebaseUIDemo) context.getApplicationContext()).mRefWatcher;
     }
 
     @Override

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

@@ -1,7 +1,7 @@
 <resources>
 
     <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+    <style name="AppTheme" parent="Theme.AppCompat.DayNight.DarkActionBar">
         <item name="colorPrimary">@color/colorPrimary</item>
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>

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

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources xmlns:tools="http://schemas.android.com/tools">
 
-    <style name="FirebaseUI" parent="Theme.AppCompat.Light.DarkActionBar">
+    <style name="FirebaseUI" parent="Theme.AppCompat.DayNight.DarkActionBar">
         <item name="colorPrimary">@color/colorPrimary</item>
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>