Fix dark mode bugs in sample (#959)

Author: SUPERCILEX

app/src/main/java/com/firebase/uidemo/auth/AuthUiActivity.java

@@ -23,6 +23,7 @@
 import android.support.annotation.StyleRes;
 import android.support.design.widget.Snackbar;
 import android.support.v7.app.AppCompatActivity;
+import android.support.v7.app.AppCompatDelegate;
 import android.view.View;
 import android.widget.Button;
 import android.widget.CheckBox;
@@ -193,6 +194,10 @@ public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
         if (isGoogleMisconfigured() || isFacebookMisconfigured() || isTwitterMisconfigured()) {
             showSnackbar(R.string.configuration_required);
         }
+
+        if (AppCompatDelegate.getDefaultNightMode() == AppCompatDelegate.MODE_NIGHT_YES) {
+            mUseDarkTheme.setChecked(true);
+        }
     }
 
     @OnClick(R.id.sign_in)
@@ -281,22 +286,26 @@ private void setFacebookScopesEnabled(boolean enabled) {
         mFacebookScopePhotos.setEnabled(enabled);
     }
 
+    @OnClick({R.id.default_theme, R.id.purple_theme, R.id.green_theme, R.id.dark_theme})
+    public void toggleDarkTheme() {
+        int mode = mUseDarkTheme.isChecked() ?
+                AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_AUTO;
+        AppCompatDelegate.setDefaultNightMode(mode);
+        getDelegate().setLocalNightMode(mode);
+    }
+
     @MainThread
     @StyleRes
     private int getSelectedTheme() {
-        if (mUseDefaultTheme.isChecked()) {
-            return AuthUI.getDefaultTheme();
+        if (mUseGreenTheme.isChecked()) {
+            return R.style.GreenTheme;
         }
 
         if (mUsePurpleTheme.isChecked()) {
             return R.style.PurpleTheme;
         }
 
-        if (mUseDarkTheme.isChecked()) {
-            return R.style.DarkTheme;
-        }
-
-        return R.style.GreenTheme;
+        return AuthUI.getDefaultTheme();
     }
 
     @MainThread

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

@@ -0,0 +1,4 @@
+<resources>
+    <color name="colorPrimary">#016AA8</color>
+    <color name="colorPrimaryDark">#01579B</color>
+</resources>

app/src/main/res/values-v21/styles.xml

@@ -3,12 +3,6 @@
     <color name="colorPrimaryDark">#0288D1</color>
     <color name="colorAccent">#FFA000</color>
 
-    <!-- Text -->
-    <color name="text_default_material_dark_primary">#ffffffff</color>
-    <color name="text_default_material_light_primary">#de000000</color>
-    <color name="text_default_material_dark_secondary">#b3ffffff</color>
-    <color name="text_default_material_light_secondary">#8a000000</color>
-
     <color name="material_deep_purple_50">#EDE7F6</color>
     <color name="material_deep_purple_500">#673AB7</color>
     <color name="material_deep_purple_700">#512DA8</color>
@@ -20,15 +14,9 @@
 
     <color name="material_gray_300">#E0E0E0</color>
     <color name="material_gray_500">#9e9e9e</color>
-    <color name="material_gray_850">#ff303030</color>
-    <color name="material_gray_900">#ff212121</color>
 
     <color name="material_lime_a700">#AEEA00</color>
-
-    <color name="material_purple_50">#F3E5F5</color>
     <color name="material_purple_a700">#AA00FF</color>
-
     <color name="material_red_a200">#FF5252</color>
 
-    <color name="material_deep_teal_a200">#ff80cbc4</color>
 </resources>

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

@@ -21,20 +21,6 @@
         <item name="android:windowBackground">@color/material_green_50</item>
     </style>
 
-    <style name="DarkTheme">
-        <item name="colorPrimary">@color/material_gray_900</item>
-        <item name="colorPrimaryDark">@android:color/black</item>
-        <item name="colorAccent">@android:color/black</item>
-        <item name="android:colorBackground">@color/material_gray_850</item>
-        <item name="android:colorForeground">@android:color/white</item>
-        <item name="android:textColor">@color/text_default_material_dark_primary</item>
-        <item name="android:textColorPrimary">@color/text_default_material_dark_primary</item>
-        <item name="android:textColorPrimaryInverse">@color/text_default_material_light_primary</item>
-        <item name="android:textColorSecondary">@color/text_default_material_dark_secondary</item>
-        <item name="android:textColorSecondaryInverse">@color/text_default_material_light_secondary</item>
-        <item name="android:windowBackground">@color/material_gray_850</item>
-    </style>
-
     <style name="WarnButton" parent="Widget.AppCompat.Button.Colored">
         <item name="colorButtonNormal">@color/material_red_a200</item>
         <item name="android:textColor">@android:color/white</item>