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。
我也遇到了同样的问题，但我认为最好总结并介绍让它工作的最后一步:
在Fragment的onCreate(Bundle savedInstanceState)方法中添加sethasoptionmenu (true)方法。
重写onCreateOptionsMenu(菜单菜单，MenuInflater膨胀器)(如果你想做一些不同的在你的片段的菜单)和onOptionsItemSelected(MenuItem项目)方法在你的片段。
在onOptionsItemSelected(MenuItem item) Activity的方法中，当菜单项操作将在onOptionsItemSelected(MenuItem item) Fragment的方法中实现时，确保返回false。
一个例子:
活动
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getSupportMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.activity_menu_item:
// Do Activity menu item stuff here
return true;
case R.id.fragment_menu_item:
// Not implemented here
return false;
default:
break;
}
return false;
}
片段
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
....
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// Do something that differs the Activity's menu here
super.onCreateOptionsMenu(menu, inflater);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.activity_menu_item:
// Not implemented here
return false;
case R.id.fragment_menu_item:
// Do Fragment menu item stuff here
return true;
default:
break;
}
return false;
}
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);
}
自androidx.activity:activity:1.4.0以来，有了一种新的方法来做到这一点
你应该使用菜单提供者API。
它的用法如下:
而不是叫super。setHasOptionMenu和实现oncreateoptionmenu你应该在onViewCreated中调用addMenuProvider。
一个例子:
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 true
}
}, viewLifecycleOwner)
}
来源:活动变更日志
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>
