Android 将选项卡添加到navigationDrawer的片段

所以我知道有很多关于我的问题的答案，但我不知道为什么它不起作用

导航抽屉按预期工作，但我正在努力实现这些选项卡。创建项目时，如果有帮助，我在开始时选择了抽屉活动

谢谢你的帮助

所以，我清理了代码并实现了更新的版本，对于未来的问题，我将发布我所有的代码

这是主要活动

 package com.example.myapplicationteeeeeeeeeest;

import android.os.Bundle;

import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;

import android.view.View;

import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;

import com.google.android.material.navigation.NavigationView;

import androidx.drawerlayout.widget.DrawerLayout;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import android.view.Menu;

public class MainActivity extends AppCompatActivity {

    private AppBarConfiguration mAppBarConfiguration;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_main );
        Toolbar toolbar = findViewById( R.id.toolbar );
        setSupportActionBar( toolbar );
        FloatingActionButton fab = findViewById( R.id.fab );
        fab.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make( view, "Replace with your own action", Snackbar.LENGTH_LONG )
                        .setAction( "Action", null ).show();
            }
        } );
        DrawerLayout drawer = findViewById( R.id.drawer_layout );
        NavigationView navigationView = findViewById( R.id.nav_view );
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        mAppBarConfiguration = new AppBarConfiguration.Builder(
                R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow,
                R.id.nav_tools, R.id.nav_share, R.id.nav_send )
                .setDrawerLayout( drawer )
                .build();
        NavController navController = Navigation.findNavController( this, R.id.nav_host_fragment );
        NavigationUI.setupActionBarWithNavController( this, navController, mAppBarConfiguration );
        NavigationUI.setupWithNavController( navigationView, navController );
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate( R.menu.main, menu );
        return true;
    }

    @Override
    public boolean onSupportNavigateUp() {
        NavController navController = Navigation.findNavController( this, R.id.nav_host_fragment );
        return NavigationUI.navigateUp( navController, mAppBarConfiguration )
                || super.onSupportNavigateUp();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />

    <include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</androidx.drawerlayout.widget.DrawerLayout>

主要活动的布局

 package com.example.myapplicationteeeeeeeeeest;

import android.os.Bundle;

import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;

import android.view.View;

import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;

import com.google.android.material.navigation.NavigationView;

import androidx.drawerlayout.widget.DrawerLayout;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import android.view.Menu;

public class MainActivity extends AppCompatActivity {

    private AppBarConfiguration mAppBarConfiguration;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_main );
        Toolbar toolbar = findViewById( R.id.toolbar );
        setSupportActionBar( toolbar );
        FloatingActionButton fab = findViewById( R.id.fab );
        fab.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make( view, "Replace with your own action", Snackbar.LENGTH_LONG )
                        .setAction( "Action", null ).show();
            }
        } );
        DrawerLayout drawer = findViewById( R.id.drawer_layout );
        NavigationView navigationView = findViewById( R.id.nav_view );
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        mAppBarConfiguration = new AppBarConfiguration.Builder(
                R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow,
                R.id.nav_tools, R.id.nav_share, R.id.nav_send )
                .setDrawerLayout( drawer )
                .build();
        NavController navController = Navigation.findNavController( this, R.id.nav_host_fragment );
        NavigationUI.setupActionBarWithNavController( this, navController, mAppBarConfiguration );
        NavigationUI.setupWithNavController( navigationView, navController );
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate( R.menu.main, menu );
        return true;
    }

    @Override
    public boolean onSupportNavigateUp() {
        NavController navController = Navigation.findNavController( this, R.id.nav_host_fragment );
        return NavigationUI.navigateUp( navController, mAppBarConfiguration )
                || super.onSupportNavigateUp();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />

    <include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</androidx.drawerlayout.widget.DrawerLayout>

库片段的布局文件

   package com.example.myapplicationteeeeeeeeeest.ui.gallery;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TabHost;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTabHost;
import androidx.lifecycle.ViewModelProviders;
import androidx.viewpager.widget.ViewPager;


import com.example.myapplicationteeeeeeeeeest.MainActivity;
import com.example.myapplicationteeeeeeeeeest.R;
import com.google.android.material.tabs.TabLayout;

public class GalleryFragment extends Fragment {

    private GalleryViewModel galleryViewModel;
    private ViewPager viewPager;
    private TapAdapter tapAdapter;
    private TabLayout tabLayout;


    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        galleryViewModel =
                ViewModelProviders.of( this ).get( GalleryViewModel.class );
        View root = inflater.inflate( R.layout.fragment_gallery, container, false );


        viewPager = (ViewPager) root.findViewById(R.id.viewPager);
        tabLayout = (TabLayout) root.findViewById(R.id.tabLayout);
        tapAdapter = new TapAdapter( this,getChildFragmentManager() );
        tapAdapter.addFragment(new ShoppingListTab(), "Shopping List");
        tapAdapter.addFragment(new RecipeTab(), "Receipt List");
        viewPager.setAdapter(tapAdapter);
        tabLayout.setupWithViewPager(viewPager);








        return root;
    }



}

    <?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    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.viewpager.widget.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />





        <com.google.android.material.tabs.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?attr/colorPrimary" />


</androidx.coordinatorlayout.widget.CoordinatorLayout>

两个选项卡的布局文件

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

</LinearLayout>


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

</LinearLayout>

还有水龙头适配器

package com.example.myapplicationteeeeeeeeeest.ui.gallery;



import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentStatePagerAdapter;

import java.util.ArrayList;
import java.util.List;

public class TapAdapter extends FragmentStatePagerAdapter {

    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    TapAdapter(GalleryFragment galleryFragment, FragmentManager fm) {
        super(fm);
    }
    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }
    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }
    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }
    @Override
    public int getCount() {
        return mFragmentList.size();
    }
}

package com.example.myapplicationteest.ui.gallery；
导入androidx.annotation.Nullable；
导入androidx.fragment.app.fragment；
导入androidx.fragment.app.FragmentManager；
导入androidx.fragment.app.FragmentStatePagerAdapter；
导入java.util.ArrayList；
导入java.util.List；
公共类TapAdapter扩展FragmentStatePagerAdapter{
私有最终列表MFFragmentList=new ArrayList（）；
私有最终列表MFFragmentTitleList=new ArrayList（）；
TapAdapter（GalleryFragment GalleryFragment，FragmentManager fm）{
超级（fm）；
}
@凌驾
公共片段getItem（int位置）{
返回MFFragmentList.get（位置）；
}
public void addFragment（片段片段，字符串标题）{
添加（片段）；
MFFragmentTitleList.add（标题）；
}
@可空
@凌驾
公共字符序列getPageTitle（int位置）{
返回MFFragmentTitleList.get（位置）；
}
@凌驾
public int getCount（）{
返回MFFragmentList.size（）；
}
}

---

我希望我没有错过任何东西

不确定，当我打开画廊片段时，我的应用程序不断崩溃，为这个RealTab内容添加了例外，编辑了问题，我试图查看例外情况，但我从来没有一个带有活套和把手的例外情况，所以我应该把标签的布局放在图库布局中吗？我更改了布局，但仍然得到一个例外我更改了几次列表，但仍然得到错误，我真的不知道出了什么问题，但我真的很想感谢你到目前为止的帮助