ViewBinding-如何获取包含布局的绑定?

问题描述 投票:-1回答:1

使用ViewBinding时,我遇到了一些未记录的案例。

第一:如何获取包含的通用视图布局零件的绑定,主绑定仅查看主布局中的项目?

第二:如何获取包含的合并类型布局部件的绑定,再次主绑定仅查看主布局中的项目?

android android-viewbinding
1个回答
0
投票

[如果有:

  1. 包含通用布局(不是合并节点),我们需要为包含的部分分配ID,这样在绑定中我们将可以访问包含的子部分
<include
    android:id="@+id/your_id"
    layout="@layout/some_layout" />

通过这种方式输入您的活动代码:

private lateinit var exampleBinding: ActivityExampleBinding  //activity_example.xml layout

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    exampleBinding = ActivityExampleBinding.inflate(layoutInflater)
    setContentView(loginBinding.root)
    //we will be able to access included layouts view like this
    val includedView: View = exampleBinding.yourId.idOfIncludedView
//[...]
}
  1. 在外部布局中包含合并块。我们无法向其中添加ID,因为合并块不是视图。假设我们有这样的永恒合并布局(merge_layout.xm):
<?xml version="1.0" encoding="utf-8"?>
<merge 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"
    tools:showIn="@layout/activity_example">

    <TextView
        android:id="@+id/some_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World" />
</merge>

要正确绑定这种合并布局,我们需要:

在您的活动代码中:

private lateinit var exampleBinding: ActivityExampleBinding  //activity_example.xml layout
private lateinit var mergeBinding: MergeLayoutBinding  //merge_layout.xml layout

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    exampleBinding = ActivityExampleBinding.inflate(layoutInflater)
    //we need to bind the root layout with our binder for external layout
    mergeBinding = MergeLayoutBinding.bind(exampleBinding.root)
    setContentView(loginBinding.root)
    //we will be able to access included in merge layout views like this
    val mergedView: View = mergeBinding.someView
//[...]
}
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