关于我使用的安卓View Binding方式

小鱼儿 2022-10-08 08:20 198阅读 0赞

方案有：

ButterKnife
    findViewById()
    View Binding

下面看下View Binding在下面的场景怎么使用

Activities
    Fragments:
        Inflate
        Bind
    RecyclerView Adapter

一、Enabling View Binding  
android \{

// module级别的build.gradle文件中添加下名的配置
    // 会自动为xml文件生成binding class
    // 命名规则是Pascal case  + Binding
    // 可在XML中添加属性来屏蔽生成binding class
    // tools:viewBindingIgnore="true"
    buildFeatures {
        viewBinding true
    }

\}  
二、Using View Binding in Activities  
class MainActivity : AppCompatActivity() \{

private lateinit var binding: ActivityMainBinding
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        val view = binding.root
        setContentView(view)
       
        // ...
    
    }

binding.myButton.setOnClickListener \{ // Button Tapped \}  
binding.myTextView.text = “View Binding is the best!”  
三、Using View Binding in Fragments  
inflate methos  
class DemoInflateFragment : Fragment() \{

private var fragmentDemoBinding: FragmentDemoBinding? = null
    
    // 注意是在onCreateView中inflate内容，所以AsyncLayoutInflater不适应Fragment
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val binding = FragmentDemoBinding.inflate(inflater, container, false)
        fragmentDemoBinding = binding
    
        binding.myButton.setOnClickListener {
             // Button Tapped
        }
    
        binding.myTextView.text = "View Binding is the best!"
    
        return binding.root
    }
    override fun onDestroyView() {
        // View不见时Fragment可以存在
        fragmentDemoBinding = null
        super.onDestroyView()
    }

\}  
Bind method  
class DemoBindFragment : Fragment(R.layout.fragment\_demo) \{

private var fragmentDemoBinding: FragmentDemoBinding? = null
    
    // 构造方法中传入了，resId，默认的onCreateView中会inflate内容，此时只需要bind即可
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val binding = FragmentDemoBinding.bind(view)
        fragmentDemoBinding = binding
    
        binding.myButton.setOnClickListener { // Button Tapped }
        binding.myTextView.text = "View Binding is the best!"
    }
    override fun onDestroyView() {
        // View不见时Fragment可以存在
        fragmentDemoBinding = null
        super.onDestroyView()
    }

\}  
四、Using View Binding in RecycleView Adapter  
class Items\_RVAdapter(private var itemsCells: ArrayList<String?>) : RecyclerView.Adapter<RecyclerView.ViewHolder>() \{

// 第一步，使用binding class作为root layout
    class ItemViewHolder(var viewBinding: ItemRowBinding) : RecyclerView.ViewHolder(viewBinding.root)
    
    // 第二步，inflate内容并返回ItemViewHolder
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        val binding = ItemRowBinding.inflate(LayoutInflater.from(parent.context), parent, false)
        return ItemViewHolder(binding)
    }
    // 第三步，直接使用了
    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        val itemViewHolder = holder as ItemViewHolder
        itemViewHolder.viewBinding.itemtextview.text = itemsCells[position]
    }