如何在 Android 片段中声明菜单？我以前使用的方法现在已被弃用。
起初：
override fun onCreateView(...): View {
setHasOptionsMenu(true)
}
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
super.onCreateOptionsMenu(menu, inflater)
this.menu = menu
inflater.inflate(R.menu.menu, this.menu)
}
从开发者文档来看，这可以通过以下方式实现：
/**
* Using the addMenuProvider() API directly in your Activity
**/
class ExampleActivity : ComponentActivity(R.layout.activity_example) {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// Add menu items without overriding methods in the Activity
addMenuProvider(object : MenuProvider {
override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
// Add menu items here
menuInflater.inflate(R.menu.example_menu, menu)
}
override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
// Handle the menu selection
return true
}
})
}
}
/**
* Using the addMenuProvider() API in a Fragment
**/
class ExampleFragment : Fragment(R.layout.fragment_example) {
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
// The usage of an interface lets you inject your own implementation
val menuHost: MenuHost = requireActivity()
// Add menu items without using the Fragment Menu APIs
// Note how we can tie the MenuProvider to the viewLifecycleOwner
// and an optional Lifecycle.State (here, RESUMED) to indicate when
// the menu should be visible
menuHost.addMenuProvider(object : MenuProvider {
override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
// Add menu items here
menuInflater.inflate(R.menu.example_menu, menu)
}
override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
// Handle the menu selection
return when (menuItem.itemId) {
R.id.menu_clear -> {
// clearCompletedTasks()
true
}
R.id.menu_refresh -> {
// loadTasks(true)
true
}
else -> false
}
}
}, viewLifecycleOwner, Lifecycle.State.RESUMED)
}
片段 setHasOptionsMenu 已弃用，请使用 setHasOptionsMenu https://developer.android.com/jetpack/androidx/releases/activity#1.4.0-alpha01
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