我试图从一组片段中添加一个项目到选项菜单。
我已经创建了一个新的MenuFragment类，并扩展了我希望包含菜单项的片段。代码如下:
Java:
public class MenuFragment extends Fragment {
MenuItem fav;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
fav = menu.add("add");
fav.setIcon(R.drawable.btn_star_big_off);
}
}
科特林：
class MenuFragment : Fragment {
lateinit var fav: MenuItem
override fun onCreate(savedInstanceState: Bundle) {
super.onCreate(savedInstanceState)
setHasOptionsMenu(true)
}
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
fav = menu.add("add");
fav.setIcon(R.drawable.btn_star_big_off);
}
}
由于某种原因，onCreateOptionsMenu似乎没有运行。
在我的例子中，下面是步骤。
步骤1
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Here notify the fragment that it should participate in options menu handling.
setHasOptionsMenu(true);
}
步骤2
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// First clear current all the menu items
menu.clear();
// Add the new menu items
inflater.inflate(R.menu.post_stuff, menu);
super.onCreateOptionsMenu(menu, inflater);
}
步骤3
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.post_stuff:
Log.d(TAG, "Will post the photo to server");
return true;
case R.id.cancel_post:
Log.d(TAG, "Will cancel post the photo");
return true;
default:
break;
}
return super.onOptionsItemSelected(item);
}
在膨胀菜单之前，您需要使用menu.clear()。
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
menu.clear();
inflater.inflate(R.menu.menu, menu);
super.onCreateOptionsMenu(menu, inflater);
}
and
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
现在在2022年，谷歌已弃用setHasOptionsMenu，你应该使用MenuProvider代替。根据我的经验，当我使用setHasOptionsMenu方法时，我在一些android 11、12上得到了NoSuchMethodException。
当使用MenuProvider为您的活动提供菜单时，不再需要此方法，它取代了onCreateOptionsMenu作为推荐的方式来提供一致的、可选的生命周期感知的、模块化的方式来处理菜单创建和项目选择。
这是你如何添加菜单到你的活动/片段atm:
/**
* Using the addMenuProvider() API directly in your Activity
**/
class ExampleActivity : ComponentActivity() {
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() {
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 true
}
}, viewLifecycleOwner, Lifecycle.State.RESUMED)
}
这是参考链接。
啊，对于像我这样懒惰的人，你必须加上这个:
dependencies {
val activity_version = "1.5.1"
// Java language implementation
implementation("androidx.activity:activity:$activity_version")
// Kotlin
implementation("androidx.activity:activity-ktx:$activity_version")
}
如果上面的选项都不适合你，在你的片段中试试这个:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setHasOptionsMenu(true)
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
....
toolBar = rootView.findViewById(R.id.import_contacts_toolbar)
toolBar?.title = "Your title"
toolBar?.subtitle = "yor subtitile"
contactsActivity().setSupportActionBar(toolBar)
toolBar?.inflateMenu(R.menu.import_contacts_menu)
...
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when (item.itemId) {
R.id.1 -> {
return true
}
R.id.2 -> {
return true
}
}
return false
}
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
menu.clear()
inflater.inflate(R.menu.import_contacts_menu, menu)
super.onCreateOptionsMenu(menu, inflater)
val search = menu.findItem(R.id.action_search)
val searchView = search.actionView as SearchView
searchView.requestFocus()
val txtSearch = searchView.findViewById<View>(androidx.appcompat.R.id.search_src_text) as EditText
txtSearch.hint = "Search..."
txtSearch.setHintTextColor(Color.WHITE);
txtSearch.setTextColor(Color.WHITE)
try {
val f: Field = TextView::class.java.getDeclaredField("mCursorDrawableRes")
f.setAccessible(true)
f.set(txtSearch, R.drawable.search_edit_text_cursor)
} catch (ignored: Exception) {
Log.d(TAG, "failed to expose cursor drawable $ignored")
}
searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener {
override fun onQueryTextSubmit(query: String): Boolean {
return false
}
override fun onQueryTextChange(newText: String): Boolean {
return true
}
})
searchView.setOnCloseListener {
}
}
在我的例子中，我有一个搜索菜单项，它被设置为始终可见。这是它的xml文件:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/action_search"
app:showAsAction="always"
app:actionViewClass="androidx.appcompat.widget.SearchView"
android:title="Search"/>
<item android:id="@+id/1"
android:title="1">
</item>
<item android:id="@+id/2"
android:title="2">
</item>
</menu>
调用super方法:
Java:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// TODO Add your menu entries here
super.onCreateOptionsMenu(menu, inflater);
}
科特林：
override fun void onCreate(savedInstanceState: Bundle) {
super.onCreate(savedInstanceState)
setHasOptionsMenu(true)
}
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
// TODO Add your menu entries here
super.onCreateOptionsMenu(menu, inflater)
}
在代码中放入日志语句，以查看是否没有调用该方法，或者您的代码是否没有修改菜单。
同时确保你在onCreate(Bundle)中调用sethasoptionmenu (boolean)来通知片段它应该参与选项菜单处理。
