CoordinatorLayout + TabLayout + ViewPager2（里面再嵌套一个RecyclerView），RecyclerView的滑动冲突解决

用了一个CoordinatorLayout 滑动布局，但是需要用到TabLayout + ViewPager2组合，然后ViewPager2里面又是一个recyclerView列表，写好代码之后，发现recyclerView无法纵向滑动，去掉CoordinatorLayout布局之后就可以滑动了，但是有需求在这儿，不可能去掉呀，所以只能从recyclerView这里想办法解决滑动冲突问题。在网上找了好久，都说是设置监听，都没有效果，最后发现，只需要在ViewPager2这里加一个属性，就可以让ViewPager2里面的RecyclerView正常纵向滑动了。这个属性就是【app:layout_behavior="@string/appbar_scrolling_view_behavior"】。

所有test代码如下：

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<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:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <com.google.android.material.appbar.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <LinearLayout
                app:layout_scrollFlags="scroll"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="300dp"
                    android:text="aaa" />
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="300dp"
                    android:text="aaa" />
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="300dp"
                    android:text="aaa" />
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="300dp"
                    android:text="aaa" />
            </LinearLayout>
            <com.google.android.material.tabs.TabLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/tabLayout" />

        </com.google.android.material.appbar.AppBarLayout>
        <androidx.viewpager2.widget.ViewPager2
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/viewPager2"/>
    </androidx.coordinatorlayout.widget.CoordinatorLayout>



</LinearLayout>

MainActivity.java：

package com.example.myapplication;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager2.widget.ViewPager2;

import android.os.Bundle;

import com.google.android.material.tabs.TabLayout;
import com.google.android.material.tabs.TabLayoutMediator;

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

public class MainActivity extends AppCompatActivity {

    // recyclerView中的item数据源
    private List<String> itemData = new ArrayList<>();
    // tabLayout的标题
    private String[] tabTitle = {"标题1", "标题2", "标题3", "标题4", "标题5", "标题6", "标题7", "标题8", "标题9"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initItemData();

        TabLayout tabLayout = findViewById(R.id.tabLayout);
        // 设置横向滑动
        tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);

        ViewPager2 viewPager2 = findViewById(R.id.viewPager2);
        viewPager2.setAdapter(new MyViewPager2Adapter(itemData, tabTitle, this));
        TabLayoutMediator tabLayoutMediator = new TabLayoutMediator(tabLayout, viewPager2, new TabLayoutMediator.TabConfigurationStrategy() {
            @Override
            public void onConfigureTab(@NonNull TabLayout.Tab tab, int position) {
                // 设置tabLayout的标题
                tab.setText(tabTitle[position]);
            }
        });
        // 应用生效
        tabLayoutMediator.attach();

    }

    /**
     * 初始化recyclerView中的item数据源
     */
    private void initItemData() {
        for (int i = 0; i < 100; i++) {
            itemData.add(i + "");
        }
    }
}

MyViewPager2Adapter.java：

package com.example.myapplication;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

public class MyViewPager2Adapter extends RecyclerView.Adapter<MyViewPager2Adapter.ViewHolder> {

    private List<String> itemData;

    private String[] TabTitle;

    private Context context;

    public MyViewPager2Adapter(List<String> itemData, String[] tabTitle, Context context) {
        this.itemData = itemData;
        TabTitle = tabTitle;
        this.context = context;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.view_pager2_recycler_view, parent, false));
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        holder.recyclerView.setAdapter(new MyRecyclerViewAdapter(itemData));
        holder.recyclerView.setLayoutManager(new LinearLayoutManager(context));
    }

    @Override
    public int getItemCount() {
        return TabTitle.length;
    }

    class ViewHolder extends RecyclerView.ViewHolder {
        RecyclerView recyclerView;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            recyclerView = itemView.findViewById(R.id.recyclerView);
        }
    }
}

view_pager2_recycler_view.xml：

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

    <androidx.recyclerview.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/recyclerView" />

</LinearLayout>

MyRecyclerViewAdapter.java：

package com.example.myapplication;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyRecyclerViewAdapter.ViewHolder> {

    List<String> itemData;

    public MyRecyclerViewAdapter(List<String> itemData) {
        this.itemData = itemData;
    }

    @NonNull
    @Override
    public MyRecyclerViewAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_view_item, parent, false));
    }

    @Override
    public void onBindViewHolder(@NonNull MyRecyclerViewAdapter.ViewHolder holder, int position) {
        holder.textView.setText(itemData.get(position));
    }

    @Override
    public int getItemCount() {
        return itemData.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder {
        TextView textView;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.text);
        }
    }
}

recycler_view_item.xml：

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/text" />

</LinearLayout>

最后的长这个样子：

如果还是有滑动冲突的话，可以把MainActivity.xml中的ViewPager2的代码改成这样：

用【NestedScrollView】把它包裹起来，然后属性【app:layout_behavior="@string/appbar_scrolling_view_behavior"】也挪动到【NestedScrollView】中就好了。

<androidx.core.widget.NestedScrollView
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <androidx.viewpager2.widget.ViewPager2
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/viewPager2"/>
        </androidx.core.widget.NestedScrollView>