Android实现RecyclerView嵌套流式布局

前言

Android开发中，列表页面是常见需求，流式布局的标签效果也是常见需求，那么两者结合的效果啥样呢？这篇文章简单实现一下。

实现过程

1. 添加流式布局依赖，在app/build.gradle文件中添加如下代码

   implementation 'com.google.android.flexbox:flexbox:3.0.0'

2. 新建Activity文件RecyclerViewActivity.class

   package com.example.androidstudy;
   
   import androidx.appcompat.app.AppCompatActivity;
   import androidx.recyclerview.widget.LinearLayoutManager;
   import androidx.recyclerview.widget.RecyclerView;
   
   import android.os.Bundle;
   import android.widget.Toast;
   
   import com.example.androidstudy.adapter.MyRecyclerAdapter;
   import com.example.androidstudy.bean.TestData;
   
   import java.util.ArrayList;
   import java.util.List;
   
   public class RecyclerViewActivity extends AppCompatActivity {
   
    private RecyclerView recyclerView;
    private MyRecyclerAdapter adapter;
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recycler_view);
        initViews();
        initListener();
    }
   
    private void initListener() {
        adapter.setItemCellClicker(tag -> Toast.makeText(RecyclerViewActivity.this, tag, Toast.LENGTH_SHORT).show());
    }
   
    private void initViews() {
        recyclerView = findViewById(R.id.recyclerview);
        // 设置布局管理器
        recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
        List<String> sss = new ArrayList<>();
        sss.add("重型卡车1");
        sss.add("重车11");
        sss.add("重型卡车3445");
        sss.add("重型卡车6677");
        List<String> sss1 = new ArrayList<>();
        sss1.add("轻型卡车1");
        sss1.add("轻车11");
        sss1.add("轻型卡车3445");
        sss1.add("轻型卡车6677");
   
        List<String> sss2 = new ArrayList<>();
        sss2.add("其他1");
        sss2.add("其他2");
        List<TestData> list = new ArrayList<>();
        list.add(new TestData("重型",sss));
        list.add(new TestData("轻型", sss1));
        list.add(new TestData("其他", sss2));
        // 实例化Adapter对象
        adapter = new MyRecyclerAdapter(this, list);
        // 设置Adapter
        recyclerView.setAdapter(adapter);
        adapter.notifyDataSetChanged();
    }
   }

   Activity页面布局activity_recycler_view.xml

   <?xml version="1.0" encoding="utf-8"?>
   <androidx.constraintlayout.widget.ConstraintLayout 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=".RecyclerViewActivity">
   
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
   
   </androidx.constraintlayout.widget.ConstraintLayout>

3. 创建Adapter文件MyRecyclerAdapter.class

   package com.example.androidstudy.adapter;
   
   import android.content.Context;
   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 com.example.androidstudy.R;
   import com.example.androidstudy.bean.TestData;
   import com.google.android.flexbox.FlexboxLayout;
   
   import java.util.List;
   
   public class MyRecyclerAdapter extends RecyclerView.Adapter<MyRecyclerAdapter.MyViewHolder>{
   
    private List<TestData> data;
    private Context myContext;
   
    public MyRecyclerAdapter(Context context, List<TestData> data) {
        this.myContext = context;
        this.data = data;
    }
   
    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_cell, parent, false);
        return new MyViewHolder(inflate);
    }
   
    public interface ItemCellClicker{
        void onItemClick(String tag);
    }
   
     // 流式布局标签点击事件
    public ItemCellClicker itemCellClicker;
     // 设置点击事件回调
    public void setItemCellClicker(ItemCellClicker itemCellClicker){
        this.itemCellClicker = itemCellClicker;
    }
   
    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        TextView title = holder.itemView.findViewById(R.id.tv_title);
        FlexboxLayout flexboxLayout = holder.itemView.findViewById(R.id.flexbox_layout);
   
        TestData data = this.data.get(position);
        List<String> tags = data.getTag();
        flexboxLayout.removeAllViews();
        // flexbox布局动态添加标签
        for (int i = 0; i < tags.size(); i++) {
            String temp = tags.get(i);
            View tagView = LayoutInflater.from(myContext).inflate(R.layout.item_tag_cell, null, false);
            TextView tag = tagView.findViewById(R.id.tv_tag);
            tag.setText(temp);
            // 设置标签点击事件
            tag.setOnClickListener(view -> itemCellClicker.onItemClick(temp));
            flexboxLayout.addView(tagView);
        }
        title.setText(data.getTitle());
    }
   
    @Override
    public int getItemCount() {
        return data.size();
    }
   
    public static class MyViewHolder extends RecyclerView.ViewHolder{
   
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
        }
    }
   }

   列表项布局item_cell.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:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="10dp"
    tools:context=".MyActivity">
   
    <TextView
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        android:id="@+id/tv_title"
        android:text="Hello android"
        android:textSize="20sp"
        android:textColor="@color/black"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <!--流式布局-->
    <com.google.android.flexbox.FlexboxLayout
        android:id="@+id/flexbox_layout"
        android:orientation="horizontal"
        app:flexWrap="wrap"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
   
   </LinearLayout>

   列表中标签布局item_tag_cell.xml

   <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="wrap_content"
    android:padding="10dp"
    tools:context=".MyActivity">
   
    <TextView
        android:id="@+id/tv_tag"
        android:paddingHorizontal="12dp"
        android:background="@drawable/item_tag_bg"
        android:gravity="center"
        android:text="Hello android"
        android:textSize="20sp"
        android:textColor="@color/black"
        android:layout_width="wrap_content"
        android:layout_height="32dp"/>
   
   </LinearLayout>

   效果