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。
在菜单文件夹中创建一个.menu xml文件，并添加这个xml文件
<item
android:id="@+id/action_search"
android:icon="@android:drawable/ic_menu_search"
android:title="@string/action_search"
app:actionViewClass="android.support.v7.widget.SearchView"
app:showAsAction="always|collapseActionView" />
在您的片段类中重写此方法和
implement SearchView.OnQueryTextListener in your fragment class
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
setHasOptionsMenu(true);
}
现在只需在fragment class中设置你的菜单xml文件
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_main, menu);
final MenuItem item = menu.findItem(R.id.action_search);
final SearchView searchView = (SearchView)
MenuItemCompat.getActionView(item);
MenuItemCompat.setOnActionExpandListener(item,
new MenuItemCompat.OnActionExpandListener() {
@Override
public boolean onMenuItemActionCollapse(MenuItem item) {
// Do something when collapsed
return true; // Return true to collapse action view
}
@Override
public boolean onMenuItemActionExpand(MenuItem item) {
// Do something when expanded
return true; // Return true to expand action view
}
});
}
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);
}
博士TL;
使用“android.support.v7.widget”。工具栏，只需执行:
toolbar.inflateMenu(R.menu.my_menu)
toolbar.setOnMenuItemClickListener {
onOptionsItemSelected(it)
}
独立的工具栏
大多数建议的解决方案，如setHasOptionsMenu(true)，只有当父活动在其布局中有工具栏并通过setSupportActionBar()声明它时才有效。然后Fragments可以参与到这个ActionBar的菜单填充中:
Fragment. oncreateoptionsmmenu():初始化Fragment主机的标准选项菜单的内容。
如果你想要一个单独的工具栏和特定片段的菜单，你可以这样做:
menu_custom_fragment.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/menu_save"
android:title="SAVE" />
</menu>
custom_fragment.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
...
CustomFragment.kt
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view = inflater.inflate(layout.custom_fragment, container, false)
val toolbar = view.findViewById<Toolbar>(R.id.toolbar)
toolbar.inflateMenu(R.menu.menu_custom_fragment)
toolbar.setOnMenuItemClickListener {
onOptionsItemSelected(it)
}
return view
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when (item.itemId) {
R.id.menu_save -> {
// TODO: User clicked the save button
true
}
else -> super.onOptionsItemSelected(item)
}
}
是的，就是这么简单。你甚至不需要重写onCreate()或onCreateOptionsMenu()。
PS:这只适用于android.support.v4.app。Fragment和android.support.v7.widget。工具栏(也要确保在样式.xml中使用AppCompatActivity和AppCompat主题)。
菜单文件:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/play"
android:titleCondensed="Speak"
android:showAsAction="always"
android:title="Speak"
android:icon="@drawable/ic_play">
</item>
<item
android:id="@+id/pause"
android:titleCondensed="Stop"
android:title="Stop"
android:showAsAction="always"
android:icon="@drawable/ic_pause">
</item>
</menu>
活动代码:
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.speak_menu_history, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.play:
Toast.makeText(getApplicationContext(), "speaking....", Toast.LENGTH_LONG).show();
return false;
case R.id.pause:
Toast.makeText(getApplicationContext(), "stopping....", Toast.LENGTH_LONG).show();
return false;
default:
break;
}
return false;
}
片段代码:
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.play:
text = page.getText().toString();
speakOut(text);
// Do Activity menu item stuff here
return true;
case R.id.pause:
speakOf();
// Not implemented here
return true;
default:
break;
}
return false;
}
