ViewBinding实践

Question

有没有更通用的方法来初始化这两个初始化行？

private var _binding: MyFragmentViewBinding? = null
private val binding get() = _binding!!

我们应该在每次绑定时都调用

binding.cancelButton.setOnClickListener {  }
binding.homeButton.setOnClickListener {  }
binding.aboutButton.setOnClickListener {   }

还是创建类变量？

cancelButton = binding.cancelButton
binding.cancelButton.setOnClickListener{}

而且，我们是否应该在adapter中设置binding = null

Answer 1

我认为这更多的是个人喜好。我喜欢用扩展函数和高阶函数

fun <T : ViewDataBinding> Fragment.getDataBinding(layout: Int, container: ViewGroup?): T {
    val binding: T = DataBindingUtil.inflate(layoutInflater, layout, container, false)
    binding.lifecycleOwner = viewLifecycleOwner
    return binding
}

我的片段看起来像这样。

class InviteFragment : Fragment() {

    private lateinit var binding: FragmentInviteBinding

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        binding = getDataBinding(R.layout.fragment_invite, container)
        return binding.apply {
            inviteAll.setOnClickListener(onInviteAllClick)
            // You can set as many click listener here 
            // or some initialization related to view such as
            // setting up recycler view adapter and decorators
        }.root
    }

    private val onInviteAllClick = View.OnClickListener {
        // Invite users
    }
}

通过这样做，您的onCreateView将更具可读性，并且永远不会变得很长。