在片段中显示顶部应用程序和上下文操作栏的问题

问题描述

最初，我试图在长按第一个片段的RecyclerView元素后显示上下文菜单。 然后，我决定至少让它出现。 我的应用程序包含三个块。我正在使用材料设计组件。顶部菜单显示在活动布局上，目前，它仅应更改为第一个片段的上下文菜单。 现在，通过单击第一个片段的RecyclerView元素来显示上下文菜单，但是上下文菜单会出现，并且顶部菜单不会消失。 我需要在每个片段上分别显示工具栏材质，并以某种方式替换为上下文吗？请解释。

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/q1"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<androidx.coordinatorlayout.widget.CoordinatorLayout
    android:id="@+id/coordinatorLayout2"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <com.google.android.material.appbar.MaterialToolbar
            android:id="@+id/topmenu"
            style="@style/Widget.MaterialComponents.Toolbar.Primary"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:menu="@menu/top_app_bar"
            app:navigationIcon="@drawable/ic_baseline_format_list_bulleted_24"
            app:title="Главная" />

    </com.google.android.material.appbar.AppBarLayout>

    <androidx.core.widget.nestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

    </androidx.core.widget.nestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

<fragment
    android:id="@+id/fragment"
    android:name="androidx.navigation.fragment.NavHostFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:defaultNavHost="true"
    app:layout_constraintBottom_toTopOf="@+id/bottomNavigationView"
    android:layout_marginTop="?attr/actionBarSize"
    android:layout_marginBottom="?attr/actionBarSize"
    app:navGraph="@navigation/my_nav" />

<com.google.android.material.bottomnavigation.BottomNavigationView
    android:id="@+id/bottomNavigationView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#fff"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:menu="@menu/bottom_menu"
    />
</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {

MaterialToolbar topBar;
MaterialAlertDialogBuilder madb;
CharSequence sortItems[] = {"По дате","По важности","По алфавиту"} ;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigationView);
    NavController navController = Navigation.findNavController(this,R.id.fragment);
    //AppBarConfiguration appBarConfiguration = AppBarConfiguration(setof(R.id.firstFragment,R.id.secondFragment,R.id.thirdFragment));
    NavigationUI.setupWithNavController(bottomNavigationView,navController);

    topBar = findViewById(R.id.topmenu);
    madb = new MaterialAlertDialogBuilder(MainActivity.this)
            .setTitle("ItsTime")
            .setSingleChoiceItems(sortItems,1,new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface,int i) {
                    switch (i)
                    {
                        case (0):
                            Toast.makeText(MainActivity.this,"Кнопка 0",Toast.LENGTH_SHORT);
                        case (1):
                            Toast.makeText(MainActivity.this,"Кнопка 1",Toast.LENGTH_SHORT);
                        case (2):
                            Toast.makeText(MainActivity.this,"Кнопка 2",Toast.LENGTH_SHORT);

                    }
                }
            })
            .setPositiveButton("Okay,Boomer",int i) {
                    Toast.makeText(MainActivity.this,"Кнопка ОК",Toast.LENGTH_SHORT);
                }
            });

    topBar.setonMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
        @Override
        public boolean onMenuItemClick(MenuItem item) {
            switch (item.getItemId())
            {
                case (R.id.itemShow):
                            madb.show();
                            return true;
            }
            return false;
        }
    });
}}

Fragment_First.xml

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

>
<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="4dp"
    android:scrollbars="vertical"
    android:background="@color/colorPrimaryDark"

    />


<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:id="@+id/coordinatorLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent">

        <com.google.android.material.floatingactionbutton.FloatingActionButton
            android:id="@+id/newEventBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:layout_alignParentRight="true"
            android:layout_gravity="bottom|end"
            android:layout_margin="32dp"
            android:src="@drawable/ic_baseline_add_24"
            android:textAllCaps="false"
            android:textSize="20sp"
            android:textStyle="bold"
            app:tint="#FFFFFF">

        </com.google.android.material.floatingactionbutton.FloatingActionButton>

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

FirstFragment.java的重要部分

android.view.ActionMode actionMode = null;
Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (getArguments() != null) {
        //mParam1 = getArguments().getString("name");
        mParam2 = getArguments().getString(ARG_ParaM2);
    }
}

@RequiresApi(api = Build.VERSION_CODES.N)
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.fragment_first_new,container,false);



    rvEvent = view.findViewById(R.id.recyclerview);
    rvEvent.setHasFixedSize(true);
    lmEvent = new linearlayoutmanager(this.getContext());
    adapterEvent = new EventAdapter(eventsProcess);

    rvEvent.setLayoutManager(lmEvent);


    adapterEvent.setonItemClickListener(new EventAdapter.OnItemClickListener() {
        @Override
        public void onItemClick(int position) {
            eventsProcess.remove(position);
            rvEvent.removeViewAt(position);
            adapterEvent.notifyItemRemoved(position);
            write(getContext(),eventsProcess,PROCESSED_EVENTS);

            if (actionMode == null){
                actionMode = ((AppCompatActivity) getActivity()).startActionMode(ContextualActionMode);
            }

        }
    });


   

    rvEvent.setAdapter(adapterEvent);

 


    return view;
}


android.view.ActionMode.Callback ContextualActionMode = new ActionMode.Callback() {
    @Override
    public boolean onCreateActionMode(ActionMode actionMode,Menu menu) {
        MenuInflater menuInflater = actionMode.getMenuInflater();
        menuInflater.inflate(R.menu.contextual_top_app_bar,menu);
        return true;
    }

    @Override
    public boolean onPrepareActionMode(ActionMode actionMode,Menu menu) {
        return false;
    }

    @Override
    public boolean onActionItemClicked(ActionMode actionMode,MenuItem menuItem) {
        switch (menuItem.getItemId()){
            case R.id.deleteIcon:
                Toast.makeText(getContext(),"себевскрой",Toast.LENGTH_SHORT).show();
                return true;
        }
        return true;
    }

    @Override
    public void onDestroyActionMode(ActionMode actionMode) {

    }
};

解决方法

好的，我通过在样式中添加<item name="windowActionModeOverlay">true</item>来解决此问题。但是问题仍然存在-我通过在活动中显示顶部菜单并在片段中显示上下文操作栏来做正确的事吗？