萬能適配器實現"RecyclerView"的多佈局

既然是萬能適配器，那麼無論什麼適配器，我們寫適配器就因該有一個固定的思想，具體實現是絕對不能寫在適配器裏的，如果實現寫在了適配器裏，那麼適配器就不是萬能適配器了

1.適配器代碼

public abstract class Myadapter <T>extends RecyclerView.Adapter <BaseRViewHouder>{
    Context context;
    int[] layoutId;
    ArrayList<T> list;
    public Myadapter(Context context, int[] layoutId, ArrayList<T> list) {
        this.context = context;
        this.layoutId = layoutId;
        this.list = list;
    }
    //綁定行佈局
    public abstract  BaseRViewHouder bindMyView(@NonNull ViewGroup parent, int viewType);
    @NonNull
    @Override
    public BaseRViewHouder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return  bindMyView(parent,viewType);
    }
    //綁定數據
    public abstract  void bind(BaseRViewHouder holder, int position);
    @Override
    public void onBindViewHolder(@NonNull BaseRViewHouder holder, int position) {
        bind(holder,position);
    }

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

2.ViewHouder代碼

public class BaseRViewHouder extends RecyclerView.ViewHolder {
    SparseArray<View> array=new SparseArray<>();
    public BaseRViewHouder(@NonNull View itemView) {
        super(itemView);
    }
    public View getView(int id){
        View view=array.get(id);
        if(view==null){
            view = itemView.findViewById(id);
            array.put(id,view);
        }
        return view;
    }
    public void setText(int id,String text){
        View view = getView(id);
        if(view!=null){
            TextView textView= (TextView) view;
            textView.setText(text);
        }
    }
    public void setImage(int id,String  image){
        View view = getView(id);
        if(view!=null){
            ImageView imageView= (ImageView) view;
            if(!image.equals("")){
                Picasso.get().load(image).into(imageView);
            }
        }
    }
}

3.外部使用適配器時候的代碼

final int[] layout = new int[]{R.layout.f1,R.layout.f4};
myadapter = new Myadapter4<Info>(this, layout, datas) {
    @Override
    public int getItemViewType(int position) {
        return datas.get(position).flag;
    }
    @Override
    public BaseRViewHouder bindMyView(@NonNull ViewGroup parent, int viewType) {
        View view=null;
        BaseRViewHouder houder=null;
        if(viewType==0){
            view = LayoutInflater.from(context).inflate(layout[0], parent, false);
        }else {
            view = LayoutInflater.from(context).inflate(layout[1], parent, false);
        }
        houder = new BaseRViewHouder(view);
        return houder;
    }
    @Override
    public void bind(BaseRViewHouder holder, int position) {
        if(list.get(position).flag==0){
            holder.setImage(R.id.zuoimg,datas.get(position).img);
            holder.setText(R.id.zuotext,datas.get(position).text);
        }else{
            holder.setImage(R.id.youimg,datas.get(position).img);
            holder.setText(R.id.youtext,datas.get(position).text);
        }
    }
};
recyclerView.setAdapter(myadapter);