Android實現RecyclerView巢狀流式佈局

前言

Android開發中，列表頁面是常見需求，流式佈局的標籤效果也是常見需求，那麼兩者結合的效果啥樣呢？這篇文章簡單實現一下。

實現過程

新增流式佈局依賴，在app/build.gradle檔案中新增如下程式碼
```
implementation 'com.google.android.flexbox:flexbox:3.0.0'
```

新建Activity檔案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);
     // 設定佈局管理器
     recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
     List<String> sss = new ArrayList<>();
     sss.add("重型卡車1");
     sss.add("重車11");
     sss.add("重型卡車3445");
     sss.add("重型卡車6677");
     List<String> sss1 = new ArrayList<>();
     sss1.add("輕型卡車1");
     sss1.add("輕車11");
     sss1.add("輕型卡車3445");
     sss1.add("輕型卡車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("輕型", sss1));
     list.add(new TestData("其他", sss2));
     // 例項化Adapter物件
     adapter = new MyRecyclerAdapter(this, list);
     // 設定Adapter
     recyclerView.setAdapter(adapter);
     adapter.notifyDataSetChanged();
 }
}

Activity頁面佈局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>

建立Adapter檔案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);
 }

  // 流式佈局標籤點選事件
 public ItemCellClicker itemCellClicker;
  // 設定點選事件回撥
 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佈局動態新增標籤
     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);
         // 設定標籤點選事件
         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);
     }
 }
}

列表項佈局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"/>
 <!--流式佈局-->
 <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>

列表中標籤佈局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>

Android實現RecyclerView巢狀流式佈局

前言

實現過程

效果

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