<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/bg">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:text="Hello World!"
        android:gravity="center"
        android:background="@color/colorAccent"
        android:textColor="@color/colorPrimary"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:text="Hello World!"
        android:gravity="center"
        android:background="@color/colorAccent"
        android:textColor="@color/colorPrimary"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:text="Hello World!"
        android:gravity="center"
        android:background="@color/colorAccent"
        android:textColor="@color/colorPrimary"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="跳转Activity"
        android:onClick="changeSkin"/>
</LinearLayout>