first version

android/res/drawable/china_icon_button.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android" >
+    
+    <item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/china_icon" />
+    <item android:state_focused="true" android:state_pressed="true" android:drawable="@drawable/china_icon_darken" />
+    <item android:state_focused="false" android:state_pressed="true" android:drawable="@drawable/china_icon_darken" />
+    <item android:drawable="@drawable/china_icon" />
+
+</selector>

android/res/drawable/russia_icon_button.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android" >
+    
+    <item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/russia_icon" />
+    <item android:state_focused="true" android:state_pressed="true" android:drawable="@drawable/russia_icon_darken" />
+    <item android:state_focused="false" android:state_pressed="true" android:drawable="@drawable/russia_icon_darken" />
+    <item android:drawable="@drawable/russia_icon" />
+
+</selector>

android/res/drawable/united_states_icon_button.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android" >
+    
+    <item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/united_states_icon" />
+    <item android:state_focused="true" android:state_pressed="true" android:drawable="@drawable/united_states_icon_darken" />
+    <item android:state_focused="false" android:state_pressed="true" android:drawable="@drawable/united_states_icon_darken" />
+    <item android:drawable="@drawable/united_states_icon" />
+
+</selector>