背景
隨著公司業務越來越複雜,在同一個列表中需要展示各種型別的資料。
總體結構
- ItemViewAdapter: 每種型別的卡片分別都是不同的ItemViewAdapter
- ItemViewAdapterFactory: 使用ItemViewAdapterFactory根據不同資料對應不同的ItemViewAdapter
- MultiRecyclerViewAdapter: MultiRecyclerViewAdapter就是RecylerView.Adapter,並是個ItemViewAdapterFactory。 具體只要繼承MultiRecyclerViewAdapter即可,實現ItemViewAdapterFactory中getViewType、onCreateItemViewAdapter兩個方法
- ContextMap: 整個Adapter共用一個ContextMap資料上下文,用於外部(例Fragment等)與ItemAdapter互動、ItemAdapter之間互動等一系列資料傳遞,可以解決引數層層傳遞的問題
- RecyclerViewHolder: 通用RecyclerView.ViewHolder,封裝根據id獲取view方法
getView(viewId)
、獲取資料上下文方法getContextMap()
使用方法
- 每種型別卡片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;
/**
* 列表單項佈局與資料繫結
* Created by luokanghui on 2017/5/24.
*/
public abstract class ItemViewAdapter<E>{
/**
* 返回列表單項View,如果View由資源layout載入而來,直接重寫{@link #onGetLayoutId()}即可
* @param parent 父view,一般為RecyclerView
* @return 列表單項View
*/
public View onCreateView(ViewGroup parent){
return LayoutInflater.from(parent.getContext()).inflate(onGetLayoutId()
, parent, false);
}
/**
* 當RecyclerViewHolder建立成功後呼叫,只會呼叫一次
* @param viewHolder 單項view集合
*/
public void onCreate(RecyclerViewHolder viewHolder){
}
/**
* 返回單項佈局的資源id,如果重寫了{@link #onCreateView(ViewGroup)},則此方法可能失效
* @return 單項佈局layout id
*/
@LayoutRes
protected abstract int onGetLayoutId();
/**
* 把資料與view進行繫結,滑動時都會呼叫
* @param viewHolder 單項view集合
* @param data 具體資料
* @param position 在列表中的位置
*/
public abstract void bindData(RecyclerViewHolder viewHolder, E data, int position);
/**
* 區域性更新時呼叫
* @param viewHolder 單項view集合
* @param data 具體資料
* @param position 在列表中的位置
* @param payloads 區域性更新標誌,不會為空(isEmpty()==false)
*/
public void bindData(RecyclerViewHolder viewHolder, E data, int position, List<Object> payloads){
}
}
複製程式碼
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);
//資料繫結
tvContent.setText(data.getContent());
}
}
複製程式碼
package com.lkh.multiadapter.sample;
/**
* 卡片1資料
* 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;
}
}
複製程式碼
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>
複製程式碼
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);
//資料繫結
tvNum.setText("num="+data.getNum());
}
}
複製程式碼
package com.lkh.multiadapter.sample;
/**
* 卡片2資料
* 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;
}
}
複製程式碼
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>
複製程式碼
- 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();
}
}
}
複製程式碼
- 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();
//設定資料
adapter.setData(generateData());
//設定adapter
recyclerView.setAdapter(adapter);
}
//造測試資料
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資料:"+i);
list.add(dataOne);
DataTwo dataTwo = new DataTwo();
dataTwo.setNum(i);
list.add(dataTwo);
}
return list;
}
}
複製程式碼
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>
複製程式碼
-
執行效果如下:
) -
總的來說,實現一個多型別佈局列表只需要寫多個不同卡片ItemViewAdapter、繼承MultiRecyclerViewAdapter用來控制不同資料使用不同ItemViewAdapter,新增一個卡片只需要新增一個ItemViewAdapter,在MultiRecyclerViewAdapter新加一項即可,不會影響其它卡片使用,而且ItemViewAdapter完全獨立,可以很好的複用。
核心程式碼
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表示沒通過
*/
private boolean checkItems(int position) {
return dataList == null || position < 0 || position >= dataList.size();
}
@Override
public MapData getContextMap() {
return mMapData;
}
}
複製程式碼
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的型別
* 建議根據data的資料型別判斷不同的viewType
* @param data 具體資料
* @param position 在列表中的位置
* @return 型別
*/
int getViewType(E data, int position);
/**
* 根據不同的viewType返回不同的ItemViewAdapter
* @param viewType 型別
* @return ItemViewAdapter
*/
ItemViewAdapter<? extends E> onCreateItemViewAdapter(int viewType);
/**
* 上下文資料
* @return
*/
MapData getContextMap();
}
複製程式碼
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,如果快取中存在,直接使用快取中的,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;
}
/**
* 獲取資料上下文
*/
public MapData getContextMap(){
return mMapData;
}
}
複製程式碼
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;
/**
* 列表單項佈局與資料繫結
* Created by luokanghui on 2017/5/24.
*/
public abstract class ItemViewAdapter<E>{
/**
* 返回列表單項View,如果View由資源layout載入而來,直接重寫{@link #onGetLayoutId()}即可
* @param parent 父view,一般為RecyclerView
* @return 列表單項View
*/
public View onCreateView(ViewGroup parent){
return LayoutInflater.from(parent.getContext()).inflate(onGetLayoutId()
, parent, false);
}
/**
* 當RecyclerViewHolder建立成功後呼叫,只會呼叫一次
* @param viewHolder 單項view集合
*/
public void onCreate(RecyclerViewHolder viewHolder){
}
/**
* 返回單項佈局的資源id,如果重寫了{@link #onCreateView(ViewGroup)},則此方法可能失效
* @return 單項佈局layout id
*/
@LayoutRes
protected abstract int onGetLayoutId();
/**
* 把資料與view進行繫結,滑動時都會呼叫
* @param viewHolder 單項view集合
* @param data 具體資料
* @param position 在列表中的位置
*/
public abstract void bindData(RecyclerViewHolder viewHolder, E data, int position);
/**
* 區域性更新時呼叫
* @param viewHolder 單項view集合
* @param data 具體資料
* @param position 在列表中的位置
* @param payloads 區域性更新標誌,不會為空(isEmpty()==false)
*/
public void bindData(RecyclerViewHolder viewHolder, E data, int position, List<Object> payloads){
}
}
複製程式碼