实现功能: 点击不同tab，切换不同fragement,效果图

1. XML布局

<LinearLayout 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"
    android:orientation="vertical"
    android:fitsSystemWindows="true"
    android:theme="@style/customTheme">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        app:navigationIcon="@drawable/abc_vector_test"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        >

        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:text="编辑商品"
            android:textColor="@color/white"
            android:textSize="22sp" />
        <TextView
            android:id="@+id/good_save"
            android:text="保存"
            android:textSize="14dp"
            android:textColor="@color/white"
            android:layout_gravity="end"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="10dp"/>
    </androidx.appcompat.widget.Toolbar>


    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tabLayout"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        app:tabIndicatorColor="#F61010"
        app:tabIndicator="@drawable/shape_indicator"
        app:tabIndicatorFullWidth="false"
        app:tabIndicatorHeight="3dp"
        app:tabMode="fixed"
        app:tabBackground="@color/white"
        app:tabPaddingEnd="0dp"
        app:tabPaddingStart="0dp"
        app:tabRippleColor="#00000000"
        app:tabSelectedTextColor="#333333"
        app:tabTextColor="#666666"
        app:tabTextAppearance="@style/myTabTextAppearance"/>

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/good_view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="80dp"
        android:visibility="gone"/>

</LinearLayout>

2. fragement实现 核心代码

 public void onActivityCreated(@NonNull Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        ImmersionBar.with(this).statusBarColor(R.color.colorPrimary).statusBarDarkFont(true).init();

        tabLayout = mActivity.findViewById(R.id.tabLayout);
        mViewPager = mActivity.findViewById(R.id.good_view_pager);
        //初始化tab
        initTab();
        initPage();
    }

    public void initTab(){
        tabLayout.removeAllTabs();
        for (int i = 0; i < titles.length; i++) {
            TabLayout.Tab tab = tabLayout.newTab();
            if (tab != null) {
                TextView view = new TextView(mContext);
                view.setText(titles[i]);
                view.setGravity(Gravity.CENTER);
                view.setTextColor(ContextCompat.getColor(mContext, R.color.black));
                tab.setCustomView(view);
            }
            tabLayout.addTab(tab);
        }
    }

    private void initPage() {
        fragments.add(GoodItemTitleFragment.newInstance("",""));
        fragments.add(GoodItemContentFragment.newInstance("",""));
        fragments.add(GoodItemTreeFragment.newInstance("",""));
        //tabs.add("全部");
        ViewPager2 viewPager2 = mActivity.findViewById(R.id.good_view_pager);
        GoodItemFragementAdapter adapter = new GoodItemFragementAdapter(mActivity.getSupportFragmentManager(),getLifecycle(),fragments);
        viewPager2.setAdapter(adapter);
        new TabLayoutMediator(tabLayout, viewPager2, new TabLayoutMediator.TabConfigurationStrategy() {
            @Override
            public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
                tab.setText(titles[position]);
            }
        }).attach();
    }

如遇技术问题，留言反馈。