add selectable background style

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

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--空心圆角矩形  -->
-<shape xmlns:android="http://schemas.android.com/apk/res/android"
-    android:shape="rectangle" >
-    <corners android:radius="10dp" /><!-- 圆角半径 -->
-    <gradient
-        android:endColor="@color/colorPrimary"
-        android:startColor="@color/colorAccent" /><!-- 矩形的内部颜色，这里设置成白色，即空心 -->
-</shape>

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

@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!--空心圆角矩形  -->
+
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle" >
-    <corners android:radius="30dp" /><!-- 圆角半径 -->
+    <corners android:radius="30dp" />
     <stroke
         android:width="1dp"
-        android:color="@color/colorBord" /><!--矩形的边线  -->
+        android:color="@color/colorBord" />
     <size
         android:height="60dp"
-        android:width="60dp" /><!--矩形的宽高  -->
+        android:width="60dp" />
 </shape>

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

@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!--空心圆角矩形  -->
+
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle" >
-    <corners android:radius="20dp" /><!-- 圆角半径 -->
+    <corners android:radius="20dp" />
     <size
         android:height="40dp"
-        android:width="40dp" /><!--矩形的宽高  -->
+        android:width="40dp" />
     <gradient
         android:endColor="@color/redBtn"
-        android:startColor="@color/redBtn" /><!-- 矩形的内部颜色，这里设置成白色，即空心 -->
+        android:startColor="@color/redBtn" />
 </shape>

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

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item
+        android:state_pressed="true"
+        android:drawable="@drawable/btn_rect_selected" />
+
+    <item android:drawable="@drawable/btn_rect_normal" />
+
+</selector>

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

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle" >
+    <corners android:radius="6dp" />
+    <stroke
+        android:width="1dp"
+        android:color="@color/colorAccent" />
+    <size
+        android:height="40dp"
+        android:width="100dp" />
+
+</shape>

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

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle" >
+    <corners android:radius="6dp" />
+    <stroke
+        android:width="1dp"
+        android:color="@color/colorAccent" />
+    <size
+        android:height="40dp"
+        android:width="100dp" />
+    <solid android:color="@color/colorAccent"/>
+</shape>

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

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!--空心圆角矩形  -->
+
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle" >
-    <corners android:radius="10dp" /><!-- 圆角半径 -->
+    <corners android:radius="10dp" />
     <gradient
         android:endColor="@android:color/white"
-        android:startColor="@android:color/white" /><!-- 矩形的内部颜色，这里设置成白色，即空心 -->
+        android:startColor="@android:color/white" />
 </shape>