如何在DialogFragment中正确使用Android视图绑定？

Question

在 DialogFragment() 中使用 Android 视图绑定的正确方法是什么？

官方文档只提到了Activity和Fragment： https://developer.android.com/topic/libraries/view-binding

Answer 1

请改用inflate(LayoutInflater.from(context)) 。 并使用binding.root设置构建器视图。

此外，正如 Google 所建议的，在使用片段时，最好在onDestroyView()将binding实例设置为 null： https://developer.android#fragments.com。

例子：

class ExampleDialog : DialogFragment() {

    private var _binding: DialogExampleBinding? = null
    // This property is only valid between onCreateDialog and
    // onDestroyView.
    private val binding get() = _binding!!

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        _binding = DialogExampleBinding.inflate(LayoutInflater.from(context))
        return AlertDialog.Builder(requireActivity())
            .setView(binding.root)
            .create()
    }
    
    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
    } 
}

Answer 2

使用视图绑定在对话框中设置适配器

1. 使用 CamelCase 中的 xml 名称并带有后缀 Binding。 变量名由xml决定： fragment_dialog_location_change.xml

2. 注意编译时对话框 object 的 class 中定义的命名法： FragmentDialogLocationChangeBinding

---

private lateinit var binding: FragmentDialogLocationChangeBinding
private lateinit var lastLocationsAdapter: LastLocationsAdapter

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    binding = FragmentDialogLocationChangeBinding.inflate(LayoutInflater.from(context))

    // The adapter could also be set before returning the dialog

    return activity?.let {
        val builder = AlertDialog.Builder(it)

        builder.setTitle("Change location")
        builder.setView(binding.root)
        builder.setMessage("Last searched")

        builder.setPositiveButton("New Search") { dialogInterface: DialogInterface, i: Int ->
           // action
        }

        builder.create()
    } ?: throw IllegalStateException("Activity cannot be null")
}

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    lastLocationsAdapter = LastLocationsAdapter()
    binding.listRecyclerView.adapter = lastLocationsAdapter

    return binding.root
}

资源