学习笔记 Tianmao 篇 RecyclerView.Adapter 的封装
2024-05-09 15:35:20
零.这能可能很不成熟 但是效果能出来
一.先写一个基础类BaseRecycleAdapter
1.构造函数要传进来
private Context context;private List list;
2. 有两个抽象方法用于在真正的Adapter 中根据view类型使用对应的方法
abstract RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType);abstract void onBindViewHolder(RecyclerView.ViewHolder holder, int position);3.要有 getList() getContext()用于子类获取list和context
public Context getContext() {return context;
}
public List getList() {return list;
}
4.这是代码
package pers.lijunxue.tianmao.adapter;import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.ViewGroup;import java.util.List;Created by rabook on 2016/10/22.abstract class BaseRecycleAdapter {private Context context;private List list;public BaseRecycleAdapter(List list , Context context){this.list = list;this.context = context;}abstract RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType);abstract void onBindViewHolder(RecyclerView.ViewHolder holder, int position);public List getList() {return list;}public Context getContext() {return context;}
}二.写真正的Adapter类继承RecyclerView.Adapter
1. 属性分为 list、context 和各个假的RecycleAdapterImpl
2. 注：（这个RecycleAdapterImpl继承基础类BaseRecycleAdapter）
List<ViewBean> list;
private Context context;
//这里放可能要用到的Adapterprivate private HomeFirstRecycleAdapterImpl homeFirstItemAdapterImpl;private HomeSecondRecycleAdapterImpl homeSecondItemAdapterImpl;
3.写出onCreateViewHolder方法 这里就要用到RecycleAdapterImpl类了，这个辅助类根据Viewbean的类型使用响应类的方法
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//根据类型实力化RecycleAdapterImplswitch (viewType){case HomeFirstViewBean.TYPE:homeFirstItemAdapterImpl = new HomeFirstRecycleAdapterImpl(list,context);return homeFirstItemAdapterImpl.onCreateViewHolder(parent,viewType);case HomeSecondViewBean.TYPE:homeSecondItemAdapterImpl = new HomeSecondRecycleAdapterImpl(list,context);return homeSecondItemAdapterImpl.onCreateViewHolder(parent,viewType);case HomeThirdViewBean.TYPE:homeThirdItemAdapterImpl = new HomeThirdRecycleAdapterImpl(list,context);return homeThirdItemAdapterImpl.onCreateViewHolder(parent,viewType);case HomeFourthViewBean.TYPE:homeFourthItemAdapterImpl = new HomeFourthRecycleAdapterImpl(list,context);return homeFourthItemAdapterImpl.onCreateViewHolder(parent,viewType);case CareFirstViewBean.TYPE:careFirstRecycleAdapterImpl = new CareFirstRecycleAdapterImpl(list,context);return careFirstRecycleAdapterImpl.onCreateViewHolder(parent,viewType);}return null;}
4.写出onBindViewHolder方法 这里也要用到RecycleAdapterImpl类了，这个辅助类根据holder的类型使用响应类的方法 因为holder是由RecycleAdapterImpl类生成的所以很容易找到响应的方法
//绑定数据,即绑定子空间中的数据@Overridepublic void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {//instanceof功能 holder是否是HomeSecondItemAdapterImpl.HomeSecondViewHolder类的实例//找了这个功能好久....//根据holder 匹配 数据设置if (holder instanceof HomeFirstRecycleAdapterImpl.HomeFirstViewHolder){homeFirstItemAdapterImpl.onBindViewHolder(holder, position);}else if (holder instanceof HomeSecondRecycleAdapterImpl.HomeSecondViewHolder) {homeSecondItemAdapterImpl.onBindViewHolder(holder, position);}else if (holder instanceof HomeThirdRecycleAdapterImpl.HomeThirdViewHolder) {homeThirdItemAdapterImpl.onBindViewHolder(holder,position);}else if (holder instanceof HomeFourthRecycleAdapterImpl.HomeFourthViewHolder) {homeFourthItemAdapterImpl.onBindViewHolder(holder,position);}else if (holder instanceof CareFirstRecycleAdapterImpl.CareFirstViewHolder) {careFirstRecycleAdapterImpl.onBindViewHolder(holder,position);}}
5.写出getItemCount()
//返回数据的大小@Overridepublic int getItemCount() {return list.size();}
6.重写getItemViewType 这个结果会被 使用到onCreateViewHolder(ViewGroup parent, int viewType) 的viewType上
//这里重写 而不是实现抽象方法 返回的东西用在 onCreateViewHolder 里的viewType参数
@Override
public int getItemViewType(int position) {return list.get(position).getType();
}
7.这是代码
package pers.lijunxue.tianmao.adapter;import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.ViewGroup;import java.util.List;import pers.lijunxue.tianmao.javabean.CareFirstViewBean;
import pers.lijunxue.tianmao.javabean.HomeFirstViewBean;
import pers.lijunxue.tianmao.javabean.HomeFourthViewBean;
import pers.lijunxue.tianmao.javabean.HomeSecondViewBean;
import pers.lijunxue.tianmao.javabean.HomeThirdViewBean;
import pers.lijunxue.tianmao.javabean.ViewBean;Created by rabook on 2016/10/20.public class RecycleAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {private List<ViewBean> list;private Context context;//这里放可能要用到的Adapterprivate HomeFirstRecycleAdapterImpl homeFirstItemAdapterImpl;private HomeSecondRecycleAdapterImpl homeSecondItemAdapterImpl;private HomeThirdRecycleAdapterImpl homeThirdItemAdapterImpl;private HomeFourthRecycleAdapterImpl homeFourthItemAdapterImpl;private CareFirstRecycleAdapterImpl careFirstRecycleAdapterImpl;public RecycleAdapter(List<ViewBean> list, Context context){this.list=list;this.context = context;}绑定item布局文件，然后在内部类ViewHolder中绑定item布局文件中的子控件@Overridepublic RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {//根据类型实力化Adapterswitch (viewType){case HomeFirstViewBean.TYPE:homeFirstItemAdapterImpl = new HomeFirstRecycleAdapterImpl(list,context);return homeFirstItemAdapterImpl.onCreateViewHolder(parent,viewType);case HomeSecondViewBean.TYPE:homeSecondItemAdapterImpl = new HomeSecondRecycleAdapterImpl(list,context);return homeSecondItemAdapterImpl.onCreateViewHolder(parent,viewType);case HomeThirdViewBean.TYPE:homeThirdItemAdapterImpl = new HomeThirdRecycleAdapterImpl(list,context);return homeThirdItemAdapterImpl.onCreateViewHolder(parent,viewType);case HomeFourthViewBean.TYPE:homeFourthItemAdapterImpl = new HomeFourthRecycleAdapterImpl(list,context);return homeFourthItemAdapterImpl.onCreateViewHolder(parent,viewType);case CareFirstViewBean.TYPE:careFirstRecycleAdapterImpl = new CareFirstRecycleAdapterImpl(list,context);return careFirstRecycleAdapterImpl.onCreateViewHolder(parent,viewType);}return null;}绑定数据,即绑定子空间中的数据@Overridepublic void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {instanceof功能 holder是否是HomeSecondItemAdapterImpl.HomeSecondViewHolder类的实例找了这个功能好久....根据holder 匹配 数据设置if (holder instanceof HomeFirstRecycleAdapterImpl.HomeFirstViewHolder){homeFirstItemAdapterImpl.onBindViewHolder(holder, position);}else if (holder instanceof HomeSecondRecycleAdapterImpl.HomeSecondViewHolder) {homeSecondItemAdapterImpl.onBindViewHolder(holder, position);}else if (holder instanceof HomeThirdRecycleAdapterImpl.HomeThirdViewHolder) {homeThirdItemAdapterImpl.onBindViewHolder(holder,position);}else if (holder instanceof HomeFourthRecycleAdapterImpl.HomeFourthViewHolder) {homeFourthItemAdapterImpl.onBindViewHolder(holder,position);}else if (holder instanceof CareFirstRecycleAdapterImpl.CareFirstViewHolder) {careFirstRecycleAdapterImpl.onBindViewHolder(holder,position);}}返回数据的大小@Overridepublic int getItemCount() {return list.size();}这里重写 而不是实现抽象方法 返回的东西用在 onCreateViewHolder 里的viewType参数@Overridepublic int getItemViewType(int position) {Log.d("getItemViewType","--------------list.get(position).getType()-------"+list.get(position).getType());return list.get(position).getType();}}三.写出RecycleAdapterImpl类
1.onCreateViewHolde中要在view里加入布局
返回HomeThirdViewHolder类的实例
2.HomeThirdViewHolder 构造函数 用于绑定布局各个控件到自己类的属性
3.HomeThirdViewHolder中onBind（）方法 对属性进行初始化 赋值
4.onBindViewHolder（）方法调用onBind（）就可以
package pers.lijunxue.tianmao.adapter;import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;import com.squareup.picasso.Picasso;import java.util.List;import pers.lijunxue.tianmao.R;
import pers.lijunxue.tianmao.javabean.HomeThirdViewBean;
import pers.lijunxue.tianmao.javabean.HomeThirdViewItemBean;适配 title 加3图片 与 4型有区别Created by rabook on 2016/10/25.public class HomeThirdRecycleAdapterImpl extends BaseRecycleAdapter {private LayoutInflater layoutInflater;public HomeThirdRecycleAdapterImpl(List list, Context context) {super(list, context);}@OverrideRecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {layoutInflater = LayoutInflater.from(parent.getContext());View view = layoutInflater.inflate(R.layout.home_item_card_view_three, parent, false);return new HomeThirdViewHolder(view);}@Overridevoid onBindViewHolder(RecyclerView.ViewHolder holder, int position) {HomeThirdViewHolder homeThirdViewHolder = (HomeThirdViewHolder)holder;homeThirdViewHolder.onBind(super.getList(),position,super.getContext());}绑定item布局文件中的子控件 监听动作class HomeThirdViewHolder extends RecyclerView.ViewHolder {private HomeThirdViewBean homeThirdViewBean;private HomeThirdViewItemBean [] items ;private TextView title ;private ImageView[] images;private int [] imgview_ids = {R.id.imgview_big,R.id.imgview_small_top,R.id.imgview_small_bottom};public HomeThirdViewHolder(View itemView) {super(itemView);items = new HomeThirdViewItemBean[3];images = new ImageView[3];title = (TextView) itemView.findViewById(R.id.text_title);for (int i = 0;i < images.length ; i++) {images[i] = (ImageView) itemView.findViewById(imgview_ids[i]);}}public void onBind(List list , int position, Context context){homeThirdViewBean = (HomeThirdViewBean)list.get(position);items [0] = homeThirdViewBean.getCpOne();items [1] = homeThirdViewBean.getCpTwo();items [2] = homeThirdViewBean.getCpThree();for (int i = 0; i<items.length;i++) {ImageView imageView = images[i];//使用网络图片Picasso.with(context).load(items[i].getImgUrl()).into(imageView);title.setText(homeThirdViewBean.getTitle());}}}
}四.在Fragment调用RecyclerView的代码
/*** 初始化 initRecyclerView 基本设置* @param view*/private void initRecyclerView(View view) {recyclerView= (RecyclerView) view.findViewById(R.id.recycler_view);recycleAdapter =new RecycleAdapter(recycleList,getContext());//加载adapterrecyclerView.setAdapter(recycleAdapter);//必须写才能出现recyclorView 也可以是GirdLayoutManager，只是显示item的图形不一样recyclerView.setLayoutManager(new LinearLayoutManager(view.getContext()));//这里设置了自定义分割线 自定义分割线的类继承了RecyclerView.ItemDecorationrecyclerView.addItemDecoration(new HomeItemDecoration());}学习笔记 Tianmao 篇 RecyclerView.Adapter 的封装相关推荐
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