增加两个图标

app/src/main/res/drawable/take_photo_shutter.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+    <solid android:color="@color/shutter_icon"/>
+    <stroke
+        android:width="5dp"
+        android:color="#FFFFFF"
+        />
+</shape>

app/src/main/res/drawable/take_photo_shutter_pressed.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="oval">
+    <solid android:color="@color/shutter_icon_pressed"/>
+</shape>

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

@@ -7,4 +7,6 @@
     <color name="teal_700">#FF018786</color>
     <color name="black">#FF000000</color>
     <color name="white">#FFFFFFFF</color>
+    <color name="shutter_icon">#2F9CF2</color>
+    <color name="shutter_icon_pressed">#40C4FF</color>
 </resources>