對RecyclerView的配接器的封裝

對RecyclerView的配接器的封裝

效果：
封裝前代碼量：

package com.example.androidtestshoping.Adapter;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.recyclerview.widget.RecyclerView;
import com.example.androidtestshoping.R;
import com.example.androidtestshoping.bean.MicroTao;
import java.util.List;

/**
 * Created by Ivan on 15/9/30.
 */
public class MicroTaoAdapter extends RecyclerView.Adapter<MicroTaoAdapter.ViewHolder> {

    private  static int VIEW_TYPE_L=0;
    private  static int VIEW_TYPE_R=1;
    private LayoutInflater mInflater;
    private List<MicroTao> mDatas;
//    private MicroTaoListener listener;

    public MicroTaoAdapter(List<MicroTao> datas){
        mDatas = datas;
    }
//    public void setMicroTaoListener(MicroTaoListener listener){
//        this.listener=listener;
//    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int type) {

        mInflater = LayoutInflater.from(viewGroup.getContext());
        return  new ViewHolder(mInflater.inflate(R.layout.mitaorefreshlayout,viewGroup,false));

    }
    public MicroTao getData(int position){

        return mDatas.get(position);
    }

    public List<MicroTao> getDatas(){

        return  mDatas;
    }
    public void clearData(){

        mDatas.clear();
        notifyItemRangeRemoved(0,mDatas.size());
    }

    public void addData(List<MicroTao> datas){

        addData(0,datas);
    }

    public void addData(int position,List<MicroTao> datas){

        if(datas !=null && datas.size()>0) {

            mDatas.addAll(datas);
            notifyItemRangeChanged(position,4);
        }

    }

    @Override
    public void onBindViewHolder(ViewHolder viewHolder, int i) {

        MicroTao microTao = mDatas.get(i);
        viewHolder.textTitle.setText(microTao.getTitle());
        viewHolder.mPrice.setText(microTao.getPrice());
        viewHolder.imageView.setImageResource(microTao.getImageView());

    }

    @Override
    public int getItemCount() {
        return mDatas.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder{

        TextView textTitle,mPrice;
        ImageView imageView;

        public ViewHolder(View itemView) {
            super(itemView);

            textTitle =  itemView.findViewById(R.id.text_title);
            mPrice=itemView.findViewById(R.id.text_price);
            imageView =  itemView.findViewById(R.id.drawee_view);

        }
    }
//    public interface MicroTaoListener{
//        void onClick(View v, int position, String title);
//    }
}

封裝后：

import android.widget.TextView;
import com.example.androidtestshoping.R;
import com.example.androidtestshoping.bean.MicroTao;
import java.util.List;
public class MTAdapter extends SimpleAdapter<MicroTao> {

    public MTAdapter(Context context, List<MicroTao > datas) {
        super(context, R.layout.mitaorefreshlayout, datas);
    }
    @Override
    protected void convert(BaseViewHolder viewHolder, MicroTao microTao) {
        TextView textView = viewHolder.getTextView(R.id.text_title);
        TextView mPrice=viewHolder.getTextView(R.id.text_price);
        ImageView draweeView =  (ImageView) viewHolder.getView(R.id.drawee_view);
        textView.setText(microTao.getTitle());
        mPrice.setText(microTao.getPrice());
        draweeView.setImageResource(microTao.getImageView());
    }
}

以后需要RecyclerView配接器,就直接寫一個實作類就好了，提高了代碼復用率，辛苦一次，偷懶n次，

一、封裝知識介紹
封裝知識介紹是我參考一位博主關于“java 封裝是什么？”的回答，我覺得他描述的非常好，我想了一下，我就不自己去寫知識介紹了，大家可以去這篇博客去看看，詳情請點擊封裝知識介紹，
二、RecyclerView的配接器的封裝

BaseAdapter的代碼：

package com.example.androidtestshoping.Adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.example.androidtestshoping.R;
import com.example.androidtestshoping.bean.MicroTao;

import java.util.List;

public abstract class BaseAdapter<T,H extends  BaseViewHolder> extends RecyclerView.Adapter<BaseViewHolder> {

    protected final Context context;
    protected final int layoutResId;
    protected List<T> datas;

    public BaseAdapter(Context context, int layoutResId) {
        this(context, layoutResId, null);
    }
    public BaseAdapter(Context context,int layoutResId,List<T> datas){
        this.context=context;
        this.layoutResId=layoutResId;
        this.datas=datas;
    }
    @NonNull
    @Override
    public BaseViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view=LayoutInflater.from(parent.getContext()).inflate(layoutResId,parent,false);
        BaseViewHolder viewHolder=new BaseViewHolder(view);
        return viewHolder;
    }
    @Override
    public void onBindViewHolder(@NonNull BaseViewHolder holder, int position) {
            T item=getItem(position);
            convert((H)holder,item);
    }
    @Override
    public int getItemCount() {
        if(datas==null||datas.size()<=0)
                return 0;
        return datas.size();
    }
    public T getData(int position){

        return datas.get(position);
    }

    public List<T> getDatas(){
        return  datas;
    }

    public void addData(List<T> datas){

        addData(0,datas);
    }

    public void addData(int position,List<T> datas){
        if(datas !=null && datas.size()>0) {

            this.datas.addAll(datas);
            this.notifyItemRangeChanged(position, datas.size());
        }
    }
    public void clearData(){
        datas.clear();
        notifyItemRangeRemoved(0,datas.size());
    }
    protected  T getItem(int position){
        if(position>=datas.size())  return null;
        return datas.get(position);
    }
    protected abstract void convert(H viewHoder,T item);
}

BaseViewHolder的代碼

package com.example.androidtestshoping.Adapter;

import android.util.SparseArray;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

public class BaseViewHolder  extends RecyclerView.ViewHolder {

    private SparseArray<View> views;
    public BaseViewHolder(@NonNull View itemView) {
        super(itemView);
        this.views=new SparseArray<View>();
    }
    public TextView getTextView(int viewId) {
        return retrieveView(viewId);
    }

    public Button getButton(int viewId) {
        return retrieveView(viewId);
    }
    public ImageView getImageView(int viewId) {
        return retrieveView(viewId);
    }

    public View getView(int viewId) {
        return retrieveView(viewId);
    }
    protected  <T extends View> T retrieveView(int viewId){
        View view=views.get(viewId);
        if(view==null){
            view=itemView.findViewById(viewId);
            views.put(viewId,view);
        }
        return (T)view;
    }
}

BaseAdapter的實作類SimpleAdapter的代碼

package com.example.androidtestshoping.Adapter;
import android.content.Context;
import java.util.List;


public abstract class SimpleAdapter<T> extends BaseAdapter<T,BaseViewHolder> {
    public SimpleAdapter(Context context, int layoutResId) {
        super(context, layoutResId);
    }
    public SimpleAdapter(Context context, int layoutResId, List<T> datas) {
        super(context, layoutResId, datas);
    }
}