Android UI 布局 <include />

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <include
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="30dp"
        layout ="@layout/header" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:weightSum="1">
        <Button android:text="@string/hello_world"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:layout_gravity="center_vertical" />
    </LinearLayout>

    <include layout ="@layout/footer" />

</RelativeLayout>

header.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:gravity="center"
    android:text= "@string/header"
    android:textSize="@dimen/abc_text_size_large_material">

</TextView>

footer.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom= "true"
    android:layout_marginBottom="30dp"
    android:gravity="center"
    android:text= "@string/footer"
    android:textSize="@dimen/abc_text_size_large_material">

</TextView>

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