在Kotlin中,
Activity
、
Fragment
和
PreferenceFragmentCompat
的声明方式。
Activity
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
addMenuProvider(object : MenuProvider {
override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
menuInflater.inflate(R.menu.main_menu, menu)
}
override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
return true
}
})
}
}
碎片
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
val menuHost: MenuHost = requireActivity()
menuHost.addMenuProvider(object : MenuProvider {
override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
menuInflater.inflate(R.menu.main_menu, menu)
}
override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
return when (menuItem.itemId) {
R.id.action_menu1 -> {
true
}
R.id.action_menu2 -> {
true
}
else -> false
}
}
}, viewLifecycleOwner, Lifecycle.State.RESUMED)
}
PreferenceFragmentCompat
val menuHost: MenuHost = requireHost() as MenuHost
使用MenuProvider接口
class FirstFragment : Fragment(), MenuProvider {
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
val menuHost: MenuHost = requireActivity()
menuHost.addMenuProvider(this, viewLifecycleOwner, Lifecycle.State.RESUMED)
}
override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
menuInflater.inflate(R.menu.second_menu, menu)
}
override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
return when (menuItem.itemId) {
R.id.menu_clear -> {
true
}
R.id.menu_refresh -> {
true
}
else -> false
}
}, viewLifecycleOwner, Lifecycle.State.RESUMED)
}