【Android,Kotlin】使用新的视图绑定工具ViewBinding !-CFANZ编程社区

【Android,Kotlin】使用新的视图绑定工具ViewBinding !

Jake Wharton 也在 Butter Knife开源库中说

Development on this tool is winding down. Please consider switching to view binding in the coming months.

这个工具的开发正在逐步结束。请考虑在未来几个月切换到ViewBinding

在那个findViewbyId的时代，ButterKnife堪称最棒的工具，长江后浪推前浪，那么…

使用新的视图绑定工具！

基于模块化开发的思想，如果你想启用某个moudle的viewBing,你就可以在当前moudle的build.gradle下加入如下代码：

plugins {
    ...
    id 'kotlin-parcelize'
    ...
}

android {
    ...
    viewBinding {
        enabled = true //已过时,之前的写法3.6
    }
    ...
}

【Android,Kotlin】使用新的视图绑定工具ViewBinding !_kotlin

plugins {
    ...
    id 'kotlin-parcelize'
    ...
}

android {
    ...
    buildFeatures {
        viewBinding true//最新的写法4.1
    }
    ...
}

如果在使用中开不想为某个布局文件生成binding类，则可以使用如下属性添加到布局的根标签中,如下图：

tools:viewBindingIgnore="true"

当moudle开启视图绑定功能后，viewBinding会为每一个布局生成对应的绑定类.每一个绑定类生成对根视图和定义了ID的所有视图的引用.

用法
比如，之前爆红的语句,在kotlin-android-extensions的天下时

recyclerView.layoutManager = layoutManager

那么我现在要这么写:Fragment

private var _placeBinding:FragmentPlaceBinding?=null
private val placeBinding get() = _placeBinding!!

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View {
    _placeBinding= FragmentPlaceBinding.inflate(inflater,container,false)
    return placeBinding.root
}

override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)
    //用法,例如如下逻辑
    val layoutManager = LinearLayoutManager(activity)
    placeBinding.recyclerView.layoutManager = layoutManager
    ...
}

override fun onDestroy() {
    super.onDestroy()
    _placeBinding=null
}

当然我这是Fragment,在Activity中…

//kotlin
private lateinit var weatherBinding: ActivityWeatherBinding

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val nowBinding=NowBinding.inflate(layoutInflater)
    setContentView(nowBinding.root)
    ...
}
//Java
NowBinding nowBinding= NowBinding.inflate(LayoutInflater.from(this));
setContentView(nowBinding.getRoot());

如果你想有更深的了解，请看:是时候拥抱ViewBinding了！！

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