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

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'

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;

@Overrideprotected 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 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 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 sss2 = new ArrayList<>();sss2.add("其他1");sss2.add("其他2");List 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AdapterrecyclerView.setAdapter(adapter);adapter.notifyDataSetChanged();}}

Activity页面布局activity_recycler_view.xml

"1.0" encoding="utf-8"?>"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">

android:id="@+id/recyclerview"android:layout_width="match_parent"android:layout_height="match_parent"/>

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{

private List data;private Context myContext;

public MyRecyclerAdapter(Context context, List data) {this.myContext = context;this.data = data;}

@NonNull@Overridepublic 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;}

@Overridepublic 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 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());}

@Overridepublic 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

"1.0" encoding="utf-8"?>"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">

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"/>

android:id="@+id/flexbox_layout"android:orientation="horizontal"app:flexWrap="wrap"android:layout_width="match_parent"android:layout_height="wrap_content"/>

列表中标签布局item_tag_cell.xml

"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">

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"/>

效果

喜欢文章的话，欢迎点赞，在看和转发。