Android RecyclerView多類型佈局卡片解決方案

背景

隨着公司業務愈來愈複雜，在同一個列表中須要展現各類類型的數據。

整體結構

• ItemViewAdapter： 每種類型的卡片分別都是不一樣的ItemViewAdapter
• ItemViewAdapterFactory： 使用ItemViewAdapterFactory根據不一樣數據對應不一樣的ItemViewAdapter
• MultiRecyclerViewAdapter： MultiRecyclerViewAdapter就是RecylerView.Adapter,並是個ItemViewAdapterFactory。 具體只要繼承MultiRecyclerViewAdapter便可，實現ItemViewAdapterFactory中getViewType、onCreateItemViewAdapter兩個方法
• ContextMap： 整個Adapter共用一個ContextMap數據上下文，用於外部（例Fragment等）與ItemAdapter交互、ItemAdapter之間交互等一系列數據傳遞，能夠解決參數層層傳遞的問題
• RecyclerViewHolder： 通用RecyclerView.ViewHolder，封裝根據id獲取view方法getView(viewId)、獲取數據上下文方法getContextMap()

使用方法

• 每種類型卡片Item都實現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;

/** * 列表單項佈局與數據綁定 * Created by luokanghui on 2017/5/24. */
public abstract class ItemViewAdapter<E>{

    /** * 返回列表單項View，若是View由資源layout加載而來，直接重寫{@link #onGetLayoutId()}便可 * @param parent 父view，通常爲RecyclerView * @return 列表單項View */
    public View onCreateView(ViewGroup parent){
        return LayoutInflater.from(parent.getContext()).inflate(onGetLayoutId()
                , parent, false);
    }

    /** * 當RecyclerViewHolder建立成功後調用，只會調用一次 * @param viewHolder 單項view集合 */
    public void onCreate(RecyclerViewHolder viewHolder){

    }

    /** * 返回單項佈局的資源id，若是重寫了{@link #onCreateView(ViewGroup)}，則此方法可能失效 * @return 單項佈局layout id */
    @LayoutRes
    protected abstract int onGetLayoutId();

    /** * 把數據與view進行綁定，滑動時都會調用 * @param viewHolder 單項view集合 * @param data 具體數據 * @param position 在列表中的位置 */
    public abstract void bindData(RecyclerViewHolder viewHolder, E data, int position);

    /** * 局部更新時調用 * @param viewHolder 單項view集合 * @param data 具體數據 * @param position 在列表中的位置 * @param payloads 局部更新標誌，不會爲空（isEmpty()==false) */
    public void bindData(RecyclerViewHolder viewHolder, E data, int position, List<Object> payloads){

    }
}
複製代碼

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;

/** * 卡片1實現 * Created by luokanghui on 2019/3/18 */
public class SampleOneItemViewAdapter extends ItemViewAdapter<DataOne> {
    @Override
    protected int onGetLayoutId() {
        //佈局layout資源id
        return R.layout.item_one;
    }

    @Override
    public void bindData(RecyclerViewHolder viewHolder, DataOne data, int position) {
        //根據id獲取view
        TextView tvContent = viewHolder.getView(R.id.tv_content);
        //數據綁定
        tvContent.setText(data.getContent());
    }
}
複製代碼

package com.lkh.multiadapter.sample;

/** * 卡片1數據 * 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;
    }
}
複製代碼

item_one.xml:

<?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>
複製代碼

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;

/** * 卡片2實現 * Created by luokanghui on 2019/3/18 */
public class SampleTwoItemViewAdapter extends ItemViewAdapter<DataTwo> {
    @Override
    protected int onGetLayoutId() {
        //佈局layout資源id
        return R.layout.item_two;
    }

    @Override
    public void bindData(RecyclerViewHolder viewHolder, DataTwo data, int position) {
        //根據id獲取view
        TextView tvNum = viewHolder.getView(R.id.tv_num);
        //數據綁定
        tvNum.setText("num="+data.getNum());
    }
}
複製代碼

package com.lkh.multiadapter.sample;

/** * 卡片2數據 * 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;
    }
}
複製代碼

item_two.xml:

<?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>
複製代碼

• 總Adapter，繼承MultiRecyclerViewAdapter

package com.lkh.multiadapter.sample;

import com.lkh.multiadapter.ItemViewAdapter;
import com.lkh.multiadapter.MultiRecyclerViewAdapter;

/** * 多佈局adapter，根據不一樣data及position，使用不一樣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();
        }
    }
}
複製代碼

• 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();

        //設置數據
        adapter.setData(generateData());

        //設置adapter
        recyclerView.setAdapter(adapter);

    }

    //造測試數據
    private List<Object> generateData(){
        List<Object> list = new ArrayList<>();
        for (int i=0; i<20; i++){
            DataOne dataOne = new DataOne();
            dataOne.setContent("這是卡片1數據："+i);
            list.add(dataOne);

            DataTwo dataTwo = new DataTwo();
            dataTwo.setNum(i);
            list.add(dataTwo);
        }
        return list;
    }
}
複製代碼

activity_main.xml:

<?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>
複製代碼

• 運行效果以下：

  

  )

• 總的來講，實現一個多類型佈局列表只須要寫多個不一樣卡片ItemViewAdapter、繼承MultiRecyclerViewAdapter用來控制不一樣數據使用不一樣ItemViewAdapter，新增一個卡片只須要新增一個ItemViewAdapter，在MultiRecyclerViewAdapter新加一項便可，不會影響其它卡片使用，並且ItemViewAdapter徹底獨立，能夠很好的複用。

核心代碼

package com.lkh.multiadapter;

import android.support.v7.widget.RecyclerView;
import android.view.ViewGroup;

import java.util.List;

/** * 多種佈局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表示沒經過 */
    private boolean checkItems(int position) {
        return dataList == null || position < 0 || position >= dataList.size();
    }

    @Override
    public MapData getContextMap() {
        return mMapData;
    }
}
複製代碼

package com.lkh.multiadapter;


/** * 多佈局ItemViewAdapter建立者 * Created by luokanghui on 2017/5/24. */
public interface ItemViewAdapterFactory<E> {

    /** * 返回ItemViewAdapter的類型 * 建議根據data的數據類型判斷不一樣的viewType * @param data 具體數據 * @param position 在列表中的位置 * @return 類型 */
    int getViewType(E data, int position);

    /** * 根據不一樣的viewType返回不一樣的ItemViewAdapter * @param viewType 類型 * @return ItemViewAdapter */
    ItemViewAdapter<? extends E> onCreateItemViewAdapter(int viewType);


    /** * 上下文數據 * @return */
    MapData getContextMap();
}
複製代碼

package com.lkh.multiadapter;

import android.support.v7.widget.RecyclerView;
import android.util.SparseArray;
import android.view.View;


/** * ViewHolder基類 */
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;
    }

    /** * 根據id獲取view，若是緩存中存在，直接使用緩存中的，避免重複執行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;
    }

    /** * 獲取數據上下文 */
    public MapData getContextMap(){
        return mMapData;
    }


}
複製代碼

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;

/** * 列表單項佈局與數據綁定 * Created by luokanghui on 2017/5/24. */

public abstract class ItemViewAdapter<E>{

    /** * 返回列表單項View，若是View由資源layout加載而來，直接重寫{@link #onGetLayoutId()}便可 * @param parent 父view，通常爲RecyclerView * @return 列表單項View */
    public View onCreateView(ViewGroup parent){
        return LayoutInflater.from(parent.getContext()).inflate(onGetLayoutId()
                , parent, false);
    }

    /** * 當RecyclerViewHolder建立成功後調用，只會調用一次 * @param viewHolder 單項view集合 */
    public void onCreate(RecyclerViewHolder viewHolder){

    }

    /** * 返回單項佈局的資源id，若是重寫了{@link #onCreateView(ViewGroup)}，則此方法可能失效 * @return 單項佈局layout id */
    @LayoutRes
    protected abstract int onGetLayoutId();

    /** * 把數據與view進行綁定，滑動時都會調用 * @param viewHolder 單項view集合 * @param data 具體數據 * @param position 在列表中的位置 */
    public abstract void bindData(RecyclerViewHolder viewHolder, E data, int position);

    /** * 局部更新時調用 * @param viewHolder 單項view集合 * @param data 具體數據 * @param position 在列表中的位置 * @param payloads 局部更新標誌，不會爲空（isEmpty()==false) */
    public void bindData(RecyclerViewHolder viewHolder, E data, int position, List<Object> payloads){

    }
}
複製代碼