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

柔情只为你懂 2022-10-22 11:56 175阅读 0赞

*  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
        }
        ...
    }

![在这里插入图片描述][2021031709491958.png]

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：  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjQ3MzIyOA_size_16_color_FFFFFF_t_70]

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！！][ViewBinding]**

[2021031709491958.png]: /images/20221022/c1e771ae48384ea8b2dfac8225cb19d2.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjQ3MzIyOA_size_16_color_FFFFFF_t_70]: /images/20221022/d14a28188b3d4db3ad79e81619691a7b.png
[ViewBinding]: https://blog.csdn.net/u010976213/article/details/104501830