Add new multi-select checkboxes to message list

Use the checkboxes of AOSP's Email app.

res/drawable/btn_check_message_list_dark.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_checked="true"
+          android:drawable="@drawable/btn_check_on_normal_holo_dark" />
+    <item android:state_checked="false"
+          android:drawable="@drawable/btn_check_off_normal_holo_dark" />
+</selector>
+

res/drawable/btn_check_message_list_light.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_checked="true"
+          android:drawable="@drawable/btn_check_on_normal_holo_light" />
+    <item android:state_checked="false"
+          android:drawable="@drawable/btn_check_off_normal_holo_light" />
+</selector>
+

res/layout/message_list_item.xml

@@ -26,9 +26,11 @@
 
         <CheckBox
             android:id="@+id/selected_checkbox"
-            android:layout_width="36dip"
+            android:layout_width="wrap_content"
             android:layout_height="wrap_content"
+            android:button="?attr/messageListCheckbox"
             android:focusable="false"
+            android:clickable="false"
             android:visibility="gone" />
 
     </LinearLayout>

res/values/attrs.xml

@@ -44,6 +44,7 @@
         <attr name="messageListThreadCountBackground" format="reference|color"/>
         <attr name="messageListActiveItemBackgroundColor" format="reference|color"/>
         <attr name="messageListDividerColor" format="reference|color"/>
+        <attr name="messageListCheckbox" format="reference"/>
         <attr name="messageViewHeaderBackgroundColor" format="reference|color"/>
         <attr name="messageViewAttachmentBackground" format="reference"/>
         <attr name="messageComposeAddContactImage" format="reference"/>

res/values/themes.xml

@@ -45,6 +45,7 @@
         <item name="messageListThreadCountBackground">@drawable/thread_count_box_light</item>
         <item name="messageListActiveItemBackgroundColor">#ff2ea7d1</item>
         <item name="messageListDividerColor">#ffcccccc</item>
+        <item name="messageListCheckbox">@drawable/btn_check_message_list_light</item>
         <item name="messageViewHeaderBackgroundColor">#ffffffff</item>
         <item name="messageViewAttachmentBackground">@drawable/attachment_text_box_light</item>
         <item name="messageComposeAddContactImage">@drawable/ic_button_add_contact_light</item>
@@ -92,6 +93,7 @@
         <item name="messageListThreadCountBackground">@drawable/thread_count_box_dark</item>
         <item name="messageListActiveItemBackgroundColor">#ff33b5e5</item>
         <item name="messageListDividerColor">#ff333333</item>
+        <item name="messageListCheckbox">@drawable/btn_check_message_list_dark</item>
         <item name="messageViewHeaderBackgroundColor">#000000</item>
         <item name="messageViewAttachmentBackground">@drawable/attachment_text_box_dark</item>
         <item name="messageComposeAddContactImage">@drawable/ic_button_add_contact_dark</item>