Workaround for mozilla-lockwise#1076 and mozilla-lockwise#1157 - Ille…

…galStateException in autofill activity

  It seems that in Android 8.0.0 (API 26) there is a bug where setting the
auto fill activity window to translucent causes an exception to be thrown.
Per mozilla-lockwise#1076 it doesn't happen on Android 8.1.

  This patch works around the problem by not setting the window to be
translucent on API 26 only. The window is (obviously) not translucent, but
the App doesn't crash and is otherwise usable.

app/src/main/res/values-v26/styles.xml

@@ -0,0 +1,19 @@
+<!--
+  ~ This Source Code Form is subject to the terms of the Mozilla Public
+  ~ License, v. 2.0. If a copy of the MPL was not distributed with this
+  ~ file, You can obtain one at http://mozilla.org/MPL/2.0/.
+  -->
+
+<resources>
+    <!-- Bug #1076 workaround: windowIsTranslucent -> false -->
+    <style name="NoBackgroundTheme" parent="Theme.AppCompat.Light.NoActionBar">
+        <item name="android:windowIsTranslucent">false</item>
+        <item name="android:windowContentOverlay">@null</item>
+        <item name="android:windowNoTitle">true</item>
+        <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:background">@android:color/transparent</item>
+        <item name="colorPrimaryDark">@android:color/transparent</item>
+        <item name="android:backgroundDimEnabled">true</item>
+        <item name="android:popupBackground">@android:color/transparent</item>
+    </style>
+</resources>

app/src/main/res/values-v27/styles.xml

@@ -0,0 +1,19 @@
+<!--
+  ~ This Source Code Form is subject to the terms of the Mozilla Public
+  ~ License, v. 2.0. If a copy of the MPL was not distributed with this
+  ~ file, You can obtain one at http://mozilla.org/MPL/2.0/.
+  -->
+
+<resources>
+    <!-- Undo bug #1076 workaround (see values-26/styles.xml) -->
+    <style name="NoBackgroundTheme" parent="Theme.AppCompat.Light.NoActionBar">
+        <item name="android:windowIsTranslucent">true</item>
+        <item name="android:windowContentOverlay">@null</item>
+        <item name="android:windowNoTitle">true</item>
+        <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:background">@android:color/transparent</item>
+        <item name="colorPrimaryDark">@android:color/transparent</item>
+        <item name="android:backgroundDimEnabled">true</item>
+        <item name="android:popupBackground">@android:color/transparent</item>
+    </style>
+</resources>