Android實現RecyclerView嵌套流式佈局

語言: CN / TW / HK

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

  1. 添加流式佈局依賴,在app/build.gradle文件中添加如下代碼 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);
    // 設置佈局管理器
    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));
    // 實例化Adapter對象
    adapter = new MyRecyclerAdapter(this, list);
    // 設置Adapter
    recyclerView.setAdapter(adapter);
    adapter.notifyDataSetChanged();
}

} Activity頁面佈局activity_recycler_view.xml

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

3. 創建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<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);
}

// 流式佈局標籤點擊事件 public ItemCellClicker itemCellClicker; // 設置點擊事件回調 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佈局動態添加標籤
    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);
        // 設置標籤點擊事件
        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

<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"/>

列表中標籤佈局item_tag_cell.xml

<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"/>

```

效果