Android ViewBinding更新，include得到优化

前言

之前的ViewBinding对include很不友好，以至于用起来很是难受，到目前优化后不再强制转换FrameLayout布局，使用更加舒适。

解决

用之前的例子，直接上代码，这次我们给include的xml加上id：

<!--布局 fragment_tab_me-->
<LinearLayout
	android:orientation="vertical"
	android:layout_width="match_parent"
    android:layout_height="match_parent" >
	
	<!--引入布局 include_mine_head_layout-->
	<include 
		android:id="@+id/include_head"
		layout="@layout/include_mine_head_layout" />
</LinearLayout>

1. 使用外部类.内部类获取控件引用值

 private lateinit val mLayout: FragmentTabMeBinding
 
 override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
 		mLayout = FragmentTabMeBinding.inflate(inflater,container,false)
	return mLayout.root
 }
 
 private fun init() {
	/* ViewBinding会给嵌入的include自动inflate成另一个bind类，直接用内部类引用
	 * 源码如下，可以在app/build/generated/ap_generated_sources/data_binding_base_class_source_out/debug/out/包名/databing/ 找到具体的bind类（后面有附图） ：
	 * 
	   @NonNull
  	   public final IncludeHeadBinding includeHeadBinding;
  	   
	   View includeHead = rootView.findViewById(include_head);
       if (includeHead == null) {
          missingId = "includeHead";
          break missingId;
       }
       IncludeHeadBinding includeHeadBinding = IncludeHeadBinding(includeHead);
	 */
	mLayout.includeHead.name.text = "xxx"
 }

1. include重新赋值

 private lateinit val mLayout: FragmentTabMeBinding
 private lateinit val mLayout: IncludeMineHeadLayoutBinding
 
 override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
 		mLayout = FragmentTabMeBinding.inflate(inflater,container,false)
 		// ViewBinding会给嵌入的include自动inflate成一个View，所以我们可以直接重新赋值
		mHeadLayout =  mLayout.includeHead 
	return mLayout.root
 }

private fun init() {
	mHeadLayout.name.text = "xxx" // 因为上面的赋值生效，所以这里是有效的
}

我个人比较喜欢用第二种方式，如果命名较长的话，第一种方式用起来特别麻烦，第二种会更方便，但缺点是会多存储一个对象。