背景
随着公司业务越来越复杂，在同一个列表中需要展示各种类型的数据。
总体结构
- ItemViewAdapter： 每种类型的卡片分别都是不同的ItemViewAdapter
- ItemViewAdapterFactory： 使用ItemViewAdapterFactory根据不同数据对应不同的ItemViewAdapter
- MultiRecyclerViewAdapter： MultiRecyclerViewAdapter就是RecylerView.Adapter,并是个ItemViewAdapterFactory。
- 具体只要继承MultiRecyclerViewAdapter即可，实现ItemViewAdapterFactory中getViewType、onCreateItemViewAdapter两个方法
- ContextMap： 整个Adapter共用一个ContextMap数据上下文，用于外部（例Fragment等）与ItemAdapter交互、ItemAdapter之间交互等一系列数据传递，可以解决参数层层传递的问题
- RecyclerViewHolder： 通用RecyclerView.ViewHolder，封装根据id获取view方法getView(viewId)、获取数据上下文方法getContextMap()
使用方法
每种类型卡片Item都实现ItemViewAdapter
package com.lkh.multiadapter; import android.support.annotation.LayoutRes; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import java.util.List; public abstract class ItemViewAdapter{ public View onCreateView(ViewGroup parent){ return LayoutInflater.from(parent.getContext()).inflate(onGetLayoutId() , parent, false); } public void onCreate(RecyclerViewHolder viewHolder){ } @LayoutRes protected abstract int onGetLayoutId(); public abstract void bindData(RecyclerViewHolder viewHolder, E data, int position); public void bindData(RecyclerViewHolder viewHolder, E data, int position, List
卡片1：
package com.lkh.multiadapter.sample; import android.widget.TextView; import com.lkh.multiadapter.ItemViewAdapter; import com.lkh.multiadapter.R; import com.lkh.multiadapter.RecyclerViewHolder; public class SampleoneItemViewAdapter extends ItemViewAdapter{ @Override protected int onGetLayoutId() { //布局layout资源id return R.layout.item_one; } @Override public void bindData(RecyclerViewHolder viewHolder, DataOne data, int position) { //根据id获取view TextView tvContent = viewHolder.getView(R.id.tv_content); //数据绑定 tvContent.setText(data.getContent()); } }
package com.lkh.multiadapter.sample;
public class DataOne {
private String content;
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
item_one.xml:
卡片2
package com.lkh.multiadapter.sample; import android.widget.TextView; import com.lkh.multiadapter.ItemViewAdapter; import com.lkh.multiadapter.R; import com.lkh.multiadapter.RecyclerViewHolder; public class SampleTwoItemViewAdapter extends ItemViewAdapter{ @Override protected int onGetLayoutId() { //布局layout资源id return R.layout.item_two; } @Override public void bindData(RecyclerViewHolder viewHolder, DataTwo data, int position) { //根据id获取view TextView tvNum = viewHolder.getView(R.id.tv_num); //数据绑定 tvNum.setText("num="+data.getNum()); } }
package com.lkh.multiadapter.sample;
public class DataTwo {
private int num;
public int getNum() {
return num;
}
public void setNum(int num) {
this.num = num;
}
}
item_two.xml:
总Adapter，继承MultiRecyclerViewAdapter
package com.lkh.multiadapter.sample; import com.lkh.multiadapter.ItemViewAdapter; import com.lkh.multiadapter.MultiRecyclerViewAdapter; public class SampleMultiAdapter extends MultiRecyclerViewAdapter
RecyclerView中使用
package com.lkh.multiadapter;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import com.lkh.multiadapter.sample.DataOne;
import com.lkh.multiadapter.sample.DataTwo;
import com.lkh.multiadapter.sample.SampleMultiAdapter;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView recyclerView = findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
SampleMultiAdapter adapter = new SampleMultiAdapter();
//设置数据
adapter.setData(generateData());
//设置adapter
recyclerView.setAdapter(adapter);
}
//造测试数据
private List
activity_main.xml:
运行效果如下：
总的来说，实现一个多类型布局列表只需要写多个不同卡片ItemViewAdapter、继承MultiRecyclerViewAdapter用来控制不同数据使用不同ItemViewAdapter，新增一个卡片只需要新增一个ItemViewAdapter，在MultiRecyclerViewAdapter新加一项即可，不会影响其它卡片使用，而且ItemViewAdapter完全独立，可以很好的复用。
核心代码
package com.lkh.multiadapter; import android.support.v7.widget.RecyclerView; import android.view.ViewGroup; import java.util.List; public abstract class MultiRecyclerViewAdapterextends RecyclerView.Adapter implements ItemViewAdapterFactory { public static final int NO_TYPE = -1; private List dataList; protected final MapData mMapData = new MapData(); public MultiRecyclerViewAdapter setData(List list) { this.dataList = list; return this; } @Override public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { ItemViewAdapter itemViewModule = onCreateItemViewAdapter(viewType); RecyclerViewHolder recyclerViewHolder = new RecyclerViewHolder(itemViewModule.onCreateView(parent), itemViewModule, this, getContextMap()); itemViewModule.onCreate(recyclerViewHolder); return recyclerViewHolder; } @Override public void onBindViewHolder(RecyclerViewHolder holder, int position) { if (checkItems(position)) { return; } holder.itemViewAdapter.bindData(holder, dataList.get(position), position); } @Override public void onBindViewHolder(RecyclerViewHolder holder, int position, List
package com.lkh.multiadapter; public interface ItemViewAdapterFactory{ int getViewType(E data, int position); ItemViewAdapter onCreateItemViewAdapter(int viewType); MapData getContextMap(); }
package com.lkh.multiadapter;
import android.support.v7.widget.RecyclerView;
import android.util.SparseArray;
import android.view.View;
public final class RecyclerViewHolder extends RecyclerView.ViewHolder {
private final SparseArray views;
ItemViewAdapter itemViewAdapter;
private final RecyclerView.Adapter adapter;
private final MapData mMapData ;
public RecyclerViewHolder(View itemView, ItemViewAdapter itemViewAdapter, RecyclerView.Adapter adapter, MapData mapData) {
super(itemView);
this.views = new SparseArray<>();
this.itemViewAdapter = itemViewAdapter;
this.adapter = adapter;
this.mMapData = mapData;
}
@SuppressWarnings("unchecked")
public T getView(int viewId) {
View view = views.get(viewId);
if (view == null) {
view = itemView.findViewById(viewId);
views.put(viewId, view);
}
return (T) view;
}
public RecyclerView.Adapter getAdapter(){
return adapter;
}
public MapData getContextMap(){
return mMapData;
}
}
package com.lkh.multiadapter; import android.support.annotation.LayoutRes; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import java.util.List; public abstract class ItemViewAdapter{ public View onCreateView(ViewGroup parent){ return LayoutInflater.from(parent.getContext()).inflate(onGetLayoutId() , parent, false); } public void onCreate(RecyclerViewHolder viewHolder){ } @LayoutRes protected abstract int onGetLayoutId(); public abstract void bindData(RecyclerViewHolder viewHolder, E data, int position); public void bindData(RecyclerViewHolder viewHolder, E data, int position, List
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。
