add action mode menu to messages (delete select all)

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

@@ -120,8 +120,11 @@
     <string name="why_camera_required">We must be granted access to the camera to read QR codes. No pictures or videos will be saved.</string>
     <string name="modem_config_slow_short">Short Range / Slow</string>
     <string name="modem_config_slow_medium">Medium Range / Slow</string>
-    <string name="delete_selected_message">Delete selected message?</string>
+    <plurals name="delete_messages">
+        <item quantity="one">Delete message?</item>
+        <item quantity="other">Delete %s messages?</item>
+    </plurals>
     <string name="delete">Delete</string>
-    <string name="delete_all_messages">Delete All Messages</string>
+    <string name="select_all">Select all</string>
     <string name="modem_config_slow_long">Long Range / Slow</string>
 </resources>

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

@@ -11,7 +11,8 @@
 
         <item name="windowNoTitle">true</item>
         <item name="android:itemTextAppearance">@style/menu_item_color</item>
-
+        <item name="actionModeStyle">@style/MyActionMode</item>
+        <item name="windowActionModeOverlay">true</item>
     </style>
 
     <style name="AppTheme.Spinner">
@@ -73,6 +74,12 @@
         <item name="materialThemeOverlay">@style/MyThemeOverlay_Toolbar</item>
     </style>
 
+    <style name="MyActionMode" parent="Base.Widget.AppCompat.ActionMode">
+        <item name="background">@color/colorPrimary</item>
+        <item name="android:textSize">16sp</item>
+        <item name="android:textColorPrimary">@color/colorOnPrimary</item>
+    </style>
+
     <style name="Theme.App.Starting" parent="Theme.SplashScreen">
         // Set the splash screen background, animated icon, and animation duration.
         <item name="windowSplashScreenBackground">@color/selectedColor</item>