Android中级:recyclerView的使用-白红宇

Android中级:recyclerView的使用

阅读量：4132 次

发布时间：2019-05-25

本文共 6255 字，大约阅读时间需要 20 分钟。

本文包含recycleView中基本使用（item不可点击）+item可点击的案例。

案例一：item不可点击

基本步骤：

/** * recycelView的使用 * 1 initView,获取recycleView * 2 initData()获取数据 * 3 initRecycle(); *          1 new Layoutmanager,并设置属性 *          2 new RecyleAdapter *          3 recycleViwe.setLayoutManager()+recycleView.setAdapter * 4 类MyRecyleAdapter *          重写oncreateHolder()+onBindViewHolder()+类MyRecyclerViewHolder *          1 类MyRecyclerViewHolder,构造方法+item中控件名称 *          2 重写oncreateHolder()，new Holeder  +  findviewByIdz找到item中的控件 *

基本的使用和listview差不多，

区别一：在创建adapter的时候继承的adapter<>要确定泛型

区别二：在创建adapter的时候需要重写oncreateHolder()+onBindViewHolder() 2个方法，

oncreateHolder(),创建viewHolder;

onBindViewHolder(),将数据与holder做绑定，

区别三：xml中定义RecyclerView 要用全路径

android.support.v7.widget.RecyclerView

，不然报错（inflater....）

代码地址：

以下内容参考大神:

；

实现listView+GridView+StaggeredGrid

利用recycleView实现以上3中情况，一般需要以下4步，中间2不可以不需要

layoutManager.setOrientation(mLinearLayoutManager);

recyclerView.setItemAnimator(itemAnimator);//

recyclerView.addItemDecoration(mDividerItemDecoration);

recyclerView.setAdapter(adapter);

itemAnimator：https://github.com/gabrielemariotti/RecyclerViewItemAnimators

listview:

recyclerView = (RecyclerView) findViewById(R.id.recyclerView);        /**1  setItemAnimator*/        DefaultItemAnimator itemAnimator =new DefaultItemAnimator();        /**下面几种是导入的libary*///        ScaleInOutItemAnimator itemAnimator = new ScaleInOutItemAnimator(recyclerView);/**item由小变大*///        SlideInOutLeftItemAnimator itemAnimator = new SlideInOutLeftItemAnimator(recyclerView);/**item由左往右*///        SlideInOutRightItemAnimator itemAnimator = new SlideInOutRightItemAnimator(recyclerView);/**item由右向左*///        SlideInOutBottomItemAnimator itemAnimator = new SlideInOutBottomItemAnimator(recyclerView);/*item由下往上**///        SlideInOutTopItemAnimator itemAnimator = new SlideInOutTopItemAnimator(recyclerView);/**item由上往下*///        SlideScaleInOutRightItemAnimator itemAnimator = new SlideScaleInOutRightItemAnimator(recyclerView);/**item由右往左 由小变大*/        recyclerView.setItemAnimator(itemAnimator);        /**2 setLayoutManager*///        LinearLayoutManager layoutManager = new LinearLayoutManager(this);//        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);        recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));        /**3  addItemDecoration*/        recyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST));        /**4  setAdapter*/        adapter = new ListGridAdapter(context,list);        recyclerView.setAdapter(adapter);

/**设置点击事件*/        adapter.setOnItemClickListener(new ListGridAdapter.OnItemClickListener() {            @Override            public void onItemClick(View view, int position) {                Toast.makeText(ListActivity.this, "clcik", Toast.LENGTH_SHORT).show();            }            @Override            public void onItemLongClick(View view, int position) {                Toast.makeText(ListActivity.this, "long clcik", Toast.LENGTH_SHORT).show();            }        }); adapter:

public class ListGridAdapter extends RecyclerView.Adapter
   
     {    private static final String TAG = "ListGridAdapter";    public Context context;    public List list;    public ListGridAdapter(Context context, List
    
      list) {        this.context = context;        this.list = list;    }    @Override    public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View itemView = LayoutInflater.from(context).inflate(R.layout.item_list_grid,parent,false);        MyHolder holder = new MyHolder(itemView);        return holder;    }    @Override    public void onBindViewHolder(final MyHolder holder, final int position) {        holder.textView.setText((String)list.get(position));        /**如果有回调，则设置点击事件*/        if (mOnItemClickListener !=null){            holder.itemView.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    /**pos = position                     * v = holder.itemView*///                    int pos = holder.getLayoutPosition();//                    mOnItemClickListener.onItemClick(holder.itemView,pos);                    mOnItemClickListener.onItemClick(v,position);                }            });            holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {                @Override                public boolean onLongClick(View v) {//                    int pos = holder.getLayoutPosition();//                    mOnItemClickListener.onItemLongClick(v,pos);                    mOnItemClickListener.onItemLongClick(v, position);                    return true;                    /**return :true if the callback consumed the long click, false otherwise;                     * true:事件被setOnLongClickListener 消耗掉                     * false：事件没有被消耗掉，转而有setOnClickListener消耗*/                }            });        }    }    @Override    public int getItemCount() {        return list.size();    }    class MyHolder extends RecyclerView.ViewHolder{        TextView textView;        public MyHolder(View itemView) {            super(itemView);            textView = (TextView) itemView.findViewById(R.id.text);        }    }    /**设置回调*/    public interface OnItemClickListener{        public void onItemClick(View view,int position);        public void onItemLongClick(View view,int position);    }    public OnItemClickListener mOnItemClickListener;    public void setOnItemClickListener(OnItemClickListener mOnItemClickListener){        this.mOnItemClickListener = mOnItemClickListener;    }    /**添加+删除数据*/    public void addItem(int position){        list.add(position,"insert one");        notifyItemInserted(position);/**插入的item在集合list中的位置position，也就是它的角标*/    }    public void removeItem(int position){        list.remove(position);        notifyItemRemoved(position);    }} gridView 与listview类似：只是GridLayoutManager

GridLayoutManager layoutManager = new GridLayoutManager(context,3);        /**gridview水平方向显示，item的width最好>100dp便于观察*///        GridLayoutManager layoutManager =new GridLayoutManager(context,3,GridLayoutManager.HORIZONTAL,false);        recyclerView.setLayoutManager(layoutManager);