在设置窗口里添加应用介绍按钮

contacts/src/main/res/layout/activity_about.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <cc.winboll.studio.libaes.views.ASupportToolbar
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:id="@+id/toolbar"/>
+
+    <LinearLayout
+        android:orientation="vertical"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1.0"
+        android:id="@+id/aboutviewroot_ll"/>
+
+</LinearLayout>

contacts/src/main/res/layout/activity_settings.xml

@@ -282,6 +282,25 @@
 
 			</LinearLayout>
 
+			<TextView
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+				android:text="其他："/>
+
+			<LinearLayout
+				android:orientation="horizontal"
+				android:layout_width="match_parent"
+				android:layout_height="wrap_content"
+				android:gravity="right">
+
+				<Button
+					android:layout_width="wrap_content"
+					android:layout_height="wrap_content"
+					android:text="关于应用"
+					android:onClick="onAbout"/>
+
+			</LinearLayout>
+
 		</LinearLayout>
 
 	</LinearLayout>