xml布局中include的使用

参考：http://blog.csdn.net/harvic880925/article/details/17263275

include_button1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="anjian1" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="按键1"/>

</LinearLayout>

include_button2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="anjian2" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="按键2"/>

</LinearLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />
    <include
        android:id="@+id/key1"
        layout="@layout/include_button1"></include>

    <include
        android:id="@+id/key2"
        layout="@layout/include_button2"></include>

</LinearLayout>