recyclerView 自定义适配器

android 5.0里的recycleView是谷歌最新的组件，是用来取代GridView Listview的，可是我不明白为什么recyclerView 没有setOnItemClickListener 和 setOnItemLongClicKListener. 没事我们自己实现，我自定义了一个适配器，看代码：

import android.content.Context;import android.graphics.Bitmap;import android.support.v7.widget.RecyclerView;import android.util.SparseArray;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.TextView;import java.util.List;public abstract class MyBaseAdapter<T> extends RecyclerView.Adapter<MyBaseAdapter.ViewHolder> {    private Context mContext;    private List<T> list;    private int layoutId;    public MyBaseAdapter(int layoutId, Context mContext, List<T> list) {        this.list = list;        this.mContext = mContext;        this.layoutId = layoutId;    }    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(mContext).inflate(layoutId, null);        ViewHolder viewHolder = new ViewHolder(view);        return viewHolder;    }    @Override    public void onBindViewHolder(final ViewHolder holder, int position) {        getItemView(holder, list.get(position));        holder.itemView.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                OnItemClick(holder, list.get(holder.getPosition()), holder.getPosition());            }        });        holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {            @Override            public boolean onLongClick(View v) {                OnItemLongClick(holder, list.get(holder.getPosition()), holder.getPosition());                return true;            }        });    }    public static class ViewHolder extends RecyclerView.ViewHolder {        private final SparseArray<View> array;        public ViewHolder(View view) {            super(view);            array = new SparseArray<View>();        }        public <T extends View> T getView(int viewId) {            View view = array.get(viewId);            if (view == null) {                view = this.itemView.findViewById(viewId);                array.put(viewId, view);            }            return (T) view;        }        public void setText(int viewId, String text) {            TextView textView = getView(viewId);            textView.setText(text);        }        public void setImg(int viewId, int resId) {            ImageView imageView = getView(viewId);            imageView.setImageResource(resId);        }        public void setImg(int viewId, Bitmap bitmap) {            ImageView imageView = getView(viewId);            imageView.setImageBitmap(bitmap);        }    }    public abstract void getItemView(ViewHolder holder, T item);    public void OnItemClick(ViewHolder holder, T item, int position) {    }    public void OnItemLongClick(ViewHolder holder, T item, int position) {    }    public List<T> getList() {        return list;    }    @Override    public int getItemCount() {        if (list != null) {            return list.size();        }        return 0;    }    public void removeItem(int position){        list.remove(position);        notifyDataSetChanged();    }}

简单说一下：

构造函数：

只有三个参数 layoutId 就是recyclerView中每一条的布局，List 可以是任意类型的，mContent就是上下文。

这里面只初始化

public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)

这里面才是真正实现的地方

public void onBindViewHolder(final ViewHolder holder, int position)

getItemView方法是必须实现的

OnItemClick  和OnItemLongClick 只要继承就可以了，当然你也可以不实现

    public abstract void getItemView(ViewHolder holder, T item);    public void OnItemClick(ViewHolder holder, T item, int position) {    }    public void OnItemLongClick(ViewHolder holder, T item, int position) {    }

再说说ViewHolder:

自定义的ViewHolder必须继承RecyclerView.ViewHolder

        private final SparseArray<View> array;        public ViewHolder(View view) {            super(view);            array = new SparseArray<View>();        }        public <T extends View> T getView(int viewId) {            View view = array.get(viewId);            if (view == null) {                view = this.itemView.findViewById(viewId);                array.put(viewId, view);            }            return (T) view;        }

其中array就是存储recyclerView每一条布局中的所有子View ,为什么要这么做，是为了在getItemView()中不需要findViewById(); 只需要getView(viewId); 就会返回相应的View对象，setText(), setImg();因为我们的布局中经常会用到所以直接写在ViewHolder里了。

这样使用：

        recyclerView.setAdapter(new MyBaseAdapter<String>(R.layout.item, this, list) {            @Override            public void getItemView(final ViewHolder holder, String item) {                /**第一种方式**/                ((TextView)holder.getView(R.id.item_text)).setText(item);                ((ImageView)holder.getView(R.id.item_image)).setImageResource(R.drawable.ic_launcher);                /**第二种方式**/                holder.setText(R.id.item_text, item);                holder.setImg(R.id.item_image, R.drawable.ic_launcher);            }            @Override            public void OnItemClick(ViewHolder holder, String item, int position) {                removeItem(holder.getPosition());            }            @Override            public void OnItemLongClick(ViewHolder holder, String item, int position) {                Toast.makeText(MainActivity2.this, String.valueOf(position)+"   long clicked", Toast.LENGTH_SHORT).show();            }        });

我是偷懒了，把OnItemClickListener 和 OnItemLongClickListener 在适配器里实现了。

其中适配器里的ViewHolder的实现借鉴了   大神 张鸿洋的

getItemView方法是必须实现的

OnItemClick  和OnItemLongClick 只要继承就可以了，当然你也可以不实现