前言：
我們?cè)谧龆嗖季值臅r(shí)候需要在adapter中各種判斷什么的（當(dāng)初我剛開(kāi)始學(xué)Android是這樣）很麻煩而且代碼也比較臃腫，看著頭疼，既然是在adapter中處理多布局的問(wèn)題那么為何我不去改變一下原始的BaseAdapter呢，RecycleView的adapter是繼承Recycleview.Adapter，而ListView是BaseAdapter，我還是說(shuō)Recycleview吧
Recycleview的適配器是泛型的，我們可以去看他的源碼

![image.png](https://upload-images.jianshu.io/upload_images/6624077-c1fa9909c1847c06.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

那么就從這兒開(kāi)始入手開(kāi)始寫(xiě)，看完了源碼就不用一點(diǎn)點(diǎn)分析了，網(wǎng)上有很多博文都有講如何去看源碼的
新增一個(gè)類定義為BaseRecyclerAdapter繼承Recycleview.Adapter()

/***
 * @since 對(duì)RecycleView適配器進(jìn)行封裝
 * @author liu
 * @param <T>
 */
public abstract class BaseRecyclerAdapter<T> extends RecyclerView.Adapter<RecyclerHouder> {
 //條目ID不一樣只能通過(guò)參數(shù)傳遞
    private int mLayoutId;
    //通過(guò)泛型傳遞
    private List<T> mDatas;
    //實(shí)例化LayoutInflate
    private LayoutInflater mInlater;
    //多布局接口
    private MulitiTypeSupport<T> muTypeSuport;
 public BaseRecyclerAdapter(Context context, List<T> mDatas, int mLayoutId) {
        this.mInlater = LayoutInflater.from(context);
        this.mLayoutId = mLayoutId;
        this.mDatas = mDatas;

    }

    public BaseRecyclerAdapter(Context context, List<T> mDatas, MulitiTypeSupport<T> typeSuport) {
        this(context, mDatas, -1);
        this.muTypeSuport = typeSuport;
    }

    @NonNull
    @Override
    public RecyclerHouder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        if (muTypeSuport != null) {
            //使用多布局
            mLayoutId = viewType;
        }
        //創(chuàng)建View
        View itemView = mInlater.inflate(mLayoutId, parent, false);


        return new RecyclerHouder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerHouder holder, final int position) {
        //對(duì)Viewhouder的優(yōu)化
        convert(holder, mDatas.get(position), position);
        //條目點(diǎn)擊事件

        if (listtenner != null) {
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    listtenner.onItemClick(view, position);
                }
            });
            holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View view) {
                    return listtenner.onItemLongClick(view, position);
                }
            });
        }
    }

    @Override
    public int getItemViewType(int position) {
        if (muTypeSuport != null) {
            return muTypeSuport.getLayoutId(mDatas.get(position));
        }
        return super.getItemViewType(position);

    }

    /***
     * 把必須參數(shù)數(shù)據(jù)傳遞進(jìn)去
     * @param houder
     * @param item 當(dāng)前數(shù)據(jù)
     * @param position 當(dāng)前索引值
     */
    protected abstract void convert(RecyclerHouder houder, T item, int position);

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

    /***
     * 設(shè)置點(diǎn)擊事件
     */
    private ItemClickListtenner listtenner;

    public void setItemClickListenner(ItemClickListtenner itemClickListenner) {
        this.listtenner = itemClickListenner;
    }

懶得寫(xiě)了，上面有注釋
接口 #ItemClickListtenner

public interface ItemClickListtenner {
    void onItemClick(View view, int position);

    boolean onItemLongClick(View view, int position);
}

多布局的接口 #

/****
 * @deprecated 多布局類型支持接口
 */
public interface MulitiTypeSupport<T> {
    int getLayoutId(T item);
}

使用方法

public class MainRecycleAdapter extends BaseRecyclerAdapter<String>{
    public MainRecycleAdapter(Context context, List<String> mDatas, int mLayoutId) {
        super(context, mDatas, mLayoutId);
    }

    @Override
    protected void convert(RecyclerHouder houder, String item, int position) {
TextView text=getView(R.id.text);
text.setText("我是馬云");
//還有一種用法是
houder.setText(R.id.text,"我是馬化騰");
    }

}

我們看看Houder,同樣是繼承Recycleview.ViewHouder

public class RecyclerHouder extends RecyclerView.ViewHolder{
    //用于緩存界面
    private SparseArray<View> mViews=new SparseArray<>();
    public RecyclerHouder(View itemView) {
        super(itemView);
    }

    /***
     * 通過(guò)viewId獲取控件
     * @param viewId
     * @param <T>
     * @return
     */
    public < T extends View> T getView(int viewId){
        //多次findviewByID，對(duì)已有的view進(jìn)行緩存
        View view=mViews.get(viewId);
        //使用緩存的方法減少findViewByID的次數(shù)
        if(view==null){
            view=itemView.findViewById(viewId);
            mViews.put(viewId,view);
        }
        return (T) view;
    }

    /***
     * 對(duì)通用功能進(jìn)行封裝
     * @param viewId
     * @param text
     * @return
     */
    public RecyclerHouder setText(int viewId,CharSequence text){
        TextView textView=getView(viewId);
        textView.setText(text);
        return this;
    }

    /***
     * 設(shè)置圖片資源
     * @param viewId
     * @param resourceId
     * @return
     */
    public RecyclerHouder setImageResource(int viewId,int resourceId){
        ImageView imageView=getView(viewId);
        imageView.setImageResource(resourceId);
        return this;
    }
}

在Activit與Fragment中使用時(shí)實(shí)現(xiàn)implements MulitiTypeSupport就可以了，然后根據(jù)你實(shí)體類中類型去顯示不同布局