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
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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; /** * 列表单项布局与数据绑定 * Created by luokanghui on 2017/5/24. */ public abstract class ItemViewAdapter<E>{ /** * 返回列表单项View,如果View由资源layout加载而来,直接重写{@link #onGetLayoutId()}即可 * @param parent 父view,一般为RecyclerView * @return 列表单项View */ public View onCreateView(ViewGroup parent){ return LayoutInflater.from(parent.getContext()).inflate(onGetLayoutId() , parent, false ); } /** * 当RecyclerViewHolder创建成功后调用,只会调用一次 * @param viewHolder 单项view集合 */ public void onCreate(RecyclerViewHolder viewHolder){ } /** * 返回单项布局的资源id,如果重写了{@link #onCreateView(ViewGroup)},则此方法可能失效 * @return 单项布局layout id */ @LayoutRes protected abstract int onGetLayoutId(); /** * 把数据与view进行绑定,滑动时都会调用 * @param viewHolder 单项view集合 * @param data 具体数据 * @param position 在列表中的位置 */ public abstract void bindData(RecyclerViewHolder viewHolder, E data, int position); /** * 局部更新时调用 * @param viewHolder 单项view集合 * @param data 具体数据 * @param position 在列表中的位置 * @param payloads 局部更新标志,不会为空(isEmpty()==false) */ public void bindData(RecyclerViewHolder viewHolder, E data, int position, List<Object> payloads){ } } |
卡片1:
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package com.lkh.multiadapter.sample; import android.widget.TextView; import com.lkh.multiadapter.ItemViewAdapter; import com.lkh.multiadapter.R; import com.lkh.multiadapter.RecyclerViewHolder; /** * 卡片1实现 * Created by luokanghui on 2019/3/18 */ public class SampleOneItemViewAdapter extends ItemViewAdapter<DataOne> { @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()); } } |
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package com.lkh.multiadapter.sample; /** * 卡片1数据 * Created by luokanghui on 2019/3/18 */ public class DataOne { private String content; public String getContent() { return content; } public void setContent(String content) { this .content = content; } } |
item_one.xml:
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<? xml version = "1.0" encoding = "utf-8" ?> < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:background = "#eeeeee" android:orientation = "vertical" > < TextView android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "卡片1" android:textColor = "#000000" /> < TextView android:id = "@+id/tv_content" android:layout_width = "wrap_content" android:layout_height = "50dp" android:gravity = "center" android:textColor = "#000000" /> </ LinearLayout > |
卡片2
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package com.lkh.multiadapter.sample; import android.widget.TextView; import com.lkh.multiadapter.ItemViewAdapter; import com.lkh.multiadapter.R; import com.lkh.multiadapter.RecyclerViewHolder; /** * 卡片2实现 * Created by luokanghui on 2019/3/18 */ public class SampleTwoItemViewAdapter extends ItemViewAdapter<DataTwo> { @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()); } } |
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package com.lkh.multiadapter.sample; /** * 卡片2数据 * Created by luokanghui on 2019/3/18 */ public class DataTwo { private int num; public int getNum() { return num; } public void setNum( int num) { this .num = num; } } |
item_two.xml:
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<? xml version = "1.0" encoding = "utf-8" ?> < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:background = "#999999" android:orientation = "vertical" > < TextView android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "卡片2" android:textColor = "#0000ff" /> < TextView android:id = "@+id/tv_num" android:layout_width = "wrap_content" android:layout_height = "100dp" android:gravity = "center" android:textColor = "#0000ff" /> </ LinearLayout > |
总Adapter,继承MultiRecyclerViewAdapter
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package com.lkh.multiadapter.sample; import com.lkh.multiadapter.ItemViewAdapter; import com.lkh.multiadapter.MultiRecyclerViewAdapter; /** * 多布局adapter,根据不同data及position,使用不同ItemViewAdapter卡片 * Created by luokanghui on 2019/3/18 */ public class SampleMultiAdapter extends MultiRecyclerViewAdapter<Object> { private static final int TYPE_EMPTY = 0 ; //空item private static final int TYPE_ONE = 1 ; //卡片1 private static final int TYPE_TWO = 2 ; //卡片2 @Override public int getViewType(Object data, int position) { if (data instanceof DataOne){ //卡片1 return TYPE_ONE; } if (data instanceof DataTwo){ //卡片2 return TYPE_TWO; } return TYPE_EMPTY; //空item } @Override public ItemViewAdapter onCreateItemViewAdapter( int viewType) { switch (viewType){ case TYPE_ONE: //卡片1 return new SampleOneItemViewAdapter(); case TYPE_TWO: //卡片2 return new SampleTwoItemViewAdapter(); default : //空item return new EmptyItemViewAdapter(); } } } |
RecyclerView中使用
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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<Object> generateData(){ List<Object> list = new ArrayList<>(); for ( int i= 0 ; i< 20 ; i++){ DataOne dataOne = new DataOne(); dataOne.setContent( "这是卡片1数据:" +i); list.add(dataOne); DataTwo dataTwo = new DataTwo(); dataTwo.setNum(i); list.add(dataTwo); } return list; } } |
activity_main.xml:
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<? xml version = "1.0" encoding = "utf-8" ?> < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:layout_width = "match_parent" android:layout_height = "match_parent" android:orientation = "vertical" > < android.support.v7.widget.RecyclerView android:id = "@+id/recycler_view" android:layout_width = "match_parent" android:layout_height = "match_parent" /> </ LinearLayout > |
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
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package com.lkh.multiadapter; import android.support.v7.widget.RecyclerView; import android.view.ViewGroup; import java.util.List; /** * 多种布局adapter * Created by luokanghui on 2017/5/24. */ public abstract class MultiRecyclerViewAdapter<E> extends RecyclerView.Adapter<RecyclerViewHolder> implements ItemViewAdapterFactory<E> { public static final int NO_TYPE = - 1 ; private List<E> dataList; protected final MapData mMapData = new MapData(); public MultiRecyclerViewAdapter setData(List<E> 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<Object> payloads) { if (checkItems(position)) { return ; } if (payloads.isEmpty()) { super .onBindViewHolder(holder, position, payloads); } else { holder.itemViewAdapter.bindData(holder, dataList.get(position), position, payloads); } } @Override public int getItemViewType( int position) { if (checkItems(position)) { return NO_TYPE; } return getViewType(dataList.get(position), position); } @Override public int getItemCount() { return dataList == null ? 0 : dataList.size(); } /** * true表示没通过 */ private boolean checkItems( int position) { return dataList == null || position < 0 || position >= dataList.size(); } @Override public MapData getContextMap() { return mMapData; } } |
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package com.lkh.multiadapter; /** * 多布局ItemViewAdapter创建者 * Created by luokanghui on 2017/5/24. */ public interface ItemViewAdapterFactory<E> { /** * 返回ItemViewAdapter的类型 * 建议根据data的数据类型判断不同的viewType * @param data 具体数据 * @param position 在列表中的位置 * @return 类型 */ int getViewType(E data, int position); /** * 根据不同的viewType返回不同的ItemViewAdapter * @param viewType 类型 * @return ItemViewAdapter */ ItemViewAdapter<? extends E> onCreateItemViewAdapter( int viewType); /** * 上下文数据 * @return */ MapData getContextMap(); } |
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package com.lkh.multiadapter; import android.support.v7.widget.RecyclerView; import android.util.SparseArray; import android.view.View; /** * ViewHolder基类 */ public final class RecyclerViewHolder extends RecyclerView.ViewHolder { private final SparseArray<View> 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; } /** * 根据id获取view,如果缓存中存在,直接使用缓存中的,避免重复执行findViewById */ @SuppressWarnings ( "unchecked" ) public <T extends View> 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; } /** * 获取数据上下文 */ public MapData getContextMap(){ return mMapData; } } |
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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; /** * 列表单项布局与数据绑定 * Created by luokanghui on 2017/5/24. */ public abstract class ItemViewAdapter<E>{ /** * 返回列表单项View,如果View由资源layout加载而来,直接重写{@link #onGetLayoutId()}即可 * @param parent 父view,一般为RecyclerView * @return 列表单项View */ public View onCreateView(ViewGroup parent){ return LayoutInflater.from(parent.getContext()).inflate(onGetLayoutId() , parent, false ); } /** * 当RecyclerViewHolder创建成功后调用,只会调用一次 * @param viewHolder 单项view集合 */ public void onCreate(RecyclerViewHolder viewHolder){ } /** * 返回单项布局的资源id,如果重写了{@link #onCreateView(ViewGroup)},则此方法可能失效 * @return 单项布局layout id */ @LayoutRes protected abstract int onGetLayoutId(); /** * 把数据与view进行绑定,滑动时都会调用 * @param viewHolder 单项view集合 * @param data 具体数据 * @param position 在列表中的位置 */ public abstract void bindData(RecyclerViewHolder viewHolder, E data, int position); /** * 局部更新时调用 * @param viewHolder 单项view集合 * @param data 具体数据 * @param position 在列表中的位置 * @param payloads 局部更新标志,不会为空(isEmpty()==false) */ public void bindData(RecyclerViewHolder viewHolder, E data, int position, List<Object> payloads){ } } |
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服务器之家。
原文链接:https://juejin.im/post/5c8f01f8e51d456bcb58d3af