操作图标未出现在工具栏中

Question

美好的一天

我正在开发使用导航组件的应用程序我设置了我的工具栏图标但它没有出现 所以我尝试按照这些指南herehere解决问题，但仍然没有出现
这是我的片段代码

public class myFragment extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_community_timeline, container, false);

}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    NavController navController = Navigation.findNavController(view);
    AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(navController.getGraph()).build();
    Toolbar toolbar = view.findViewById(R.id.timeline_toolbar);
    NavigationUI.setupWithNavController(toolbar, navController, appBarConfiguration);


}

Xml 文件

    <?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".User.Community.CommunityTimelineFragment">

<androidx.appcompat.widget.Toolbar
        android:id="@+id/timeline_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        android:elevation="4dp"
        android:minHeight="?attr/actionBarSize"
        android:theme="?attr/actionBarTheme"
        app:menu="@menu/user_menu"
        app:title="@string/timeline" />

</FrameLayout>

我的菜单

    <?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/add_company"
        android:icon="@drawable/ic_company"
        android:title="@string/add_company"
        android:visible="true"
        app:showAsAction="always" />
    <item
        android:id="@+id/fiter_bodcast"
        android:icon="@drawable/ic_bodcast"
        android:title="@string/filter_setting"
        android:visible="true"
        app:showAsAction="ifRoom" />
    <item
        android:id="@+id/add_question"
        android:icon="@drawable/ic_question"
        android:title="@string/add_question"
        android:visible="true"
        app:showAsAction="ifRoom" />
</menu>

请任何人知道为什么会发生此问题

Answer 1

尝试在您的onCreateView 方法中创建所有视图。

而不是这个：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_community_timeline, container, false);

}

你应该这样做：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_community_timeline, container, false);

    NavController navController = Navigation.findNavController(view);
    AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(navController.getGraph()).build();
    Toolbar toolbar = view.findViewById(R.id.timeline_toolbar);
    NavigationUI.setupWithNavController(toolbar, navController, appBarConfiguration);

    return view;
}

希望对你有帮助