include
这个处理起来比较简单，假设布局layout1includelayout2，可以这样写：
layout1.xml
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| <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include
android:id="@+id/layout2"
layout="@layout/layout2" />
</LinearLayout>
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layout2.xml
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| <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/tvContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
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我们要怎么拿到layout2的tvContent呢？如下：
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| val layout1Binding = Layout1Binding.inflate(layoutInflater)
layout1Binding.layout2.tvContent.text = "Hello, World!"
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merge
如下给layout2加入merge标签，然后必须把layout1中include的id移除掉，否则会造成应用崩溃。使用merge的好处就是减少了一层布局嵌套，相当于直接把merge里面的内容填充到了include的位置。
layout1.xml
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| <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include layout="@layout/layout2" />
</LinearLayout>
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layout2.xml
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| <?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:id="@+id/tvContent"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</merge>
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其实这也不麻烦，使用bind方法把两个绑定类对象关联起来即可。
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| val layout1Binding = Layout1Binding.inflate(layoutInflater)
val layout2Binding = Layout2Binding.bind(layout1Binding.root)
layout2Binding.tvContent.text = "Hello, World!"
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