RecyclerView的Item的单击事件

显示效果

 

recyclerview 的每个item的点击事件并没有像listview一样封装在组件中，需要item的单击事件时就需要自己去实现，在adapter中为recyclerview添加单击事件参考如下：

recyclerview的使用方法请参考：recyclerview的简单使用

第一步：

在recyclerview的adapyer中定义单击事件的回调接口：

/**
 * 定义recyclerview选项单击事件的回调接口
 */
public interface onitemclicklistener{
    //参数（父组件，当前单击的view,单击的view的位置，数据）
    void onitemclick(recyclerview parent,view view, int position, string data);
}

第二步：

在recyclerview的adapyer中声明该接口，并提供setter方法：

private onitemclicklistener onitemclicklistener;
public void setonitemclicklistener(onitemclicklistener onitemclicklistener){
    this.onitemclicklistener = onitemclicklistener;
}

第三步：

在recyclerview的adapyer类实现view.onclicklistener接口，并重写onclick(view view)方法，然后设置给接口的事件监听：

public class rvadapter1 extends recyclerview.adapter<rvadapter1.dataviewholder> implements view.onclicklistener{
    ...
    view.setonclicklistener(this);//设置监听器
    ...
    @override
    public void onclick(view view) {
        //根据recyclerview获得当前view的位置
        int position = recyclerview.getchildadapterposition(view);
        //程序执行到此，会去执行具体实现的onitemclick()方法
        if (onitemclicklistener!=null){
            onitemclicklistener.onitemclick(recyclerview,view,position,mlist.get(position));
        }
    }
    ...
}

第四步：

在mainactivity中通过adapter设置每个item的单击事件：

adapter.setonitemclicklistener(new rvadapter1.onitemclicklistener() {
    @override
    public void onitemclick(recyclerview parent, view view, int position, string data) {
        toast.maketext(mainactivity.this, data, toast.length_short).show();
    }
});

参考代码

adapter

/**
 * created by jzman on 2017/5/13 0013.
 * recycleview的adapter
 */
public class rvadapter1 extends recyclerview.adapter<rvadapter1.dataviewholder> implements view.onclicklistener{
    private context mcontext;
    private recyclerview recyclerview;
    private arraylist<string> mlist;

    public rvadapter1() {}

    public rvadapter1(context mcontext, arraylist<string> mlist) {
        this.mcontext = mcontext;
        this.mlist = mlist;
    }

    /**
     * 用于创建viewholder
     * @param parent
     * @param viewtype
     * @return
     */
    @override
    public dataviewholder oncreateviewholder(viewgroup parent, int viewtype) {
        view view = layoutinflater.from(mcontext).inflate(r.layout.item,null);
        view.setonclicklistener(this);
        //使用代码设置宽高（xml布局设置无效时）
        view.setlayoutparams(new viewgroup.layoutparams(
                viewgroup.layoutparams.match_parent,
                viewgroup.layoutparams.wrap_content));
        dataviewholder holder = new dataviewholder(view);
        return holder;
    }

    /**
     * 绑定数据
     * @param holder
     * @param position
     */
    @override
    public void onbindviewholder(dataviewholder holder, int position) {
        holder.tv_data.settext(mlist.get(position));
    }

    /**
     * 选项总数
     * @return
     */
    @override
    public int getitemcount() {
        return mlist.size();
    }

    @override
    public void onclick(view view) {
        //根据recyclerview获得当前view的位置
        int position = recyclerview.getchildadapterposition(view);
        //程序执行到此，会去执行具体实现的onitemclick()方法
        if (onitemclicklistener!=null){
            onitemclicklistener.onitemclick(recyclerview,view,position,mlist.get(position));
        }
    }

    /**
     * 创建viewholder
     */
    public static class dataviewholder extends recyclerview.viewholder{
        textview tv_data;
        public dataviewholder(view itemview) {
            super(itemview);
            tv_data = (textview) itemview.findviewbyid(r.id.tv_recycle);
        }
    }

    private onitemclicklistener onitemclicklistener;
    public void setonitemclicklistener(onitemclicklistener onitemclicklistener){
        this.onitemclicklistener = onitemclicklistener;
    }

    /**
     * 定义recyclerview选项单击事件的回调接口
     */
    public interface onitemclicklistener{
        //参数（父组件，当前单击的view,单击的view的位置，数据）
        void onitemclick(recyclerview parent,view view, int position, string data);
    }
    /**
     *   将recycleview附加到adapter上
     */
    @override
    public void onattachedtorecyclerview(recyclerview recyclerview) {
        super.onattachedtorecyclerview(recyclerview);
        this.recyclerview= recyclerview;
    }
    /**
     *   将recycleview从adapter解除
     */
    @override
    public void ondetachedfromrecyclerview(recyclerview recyclerview) {
        super.ondetachedfromrecyclerview(recyclerview);
        this.recyclerview = null;
    }
}

mainactivity

/**
 * created by jzman on 2017/5/13 0013.
 */
public class mainactivity extends appcompatactivity {
    private recyclerview rv;
    rvadapter1 adapter;
    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_main);
        rv = (recyclerview) findviewbyid(r.id.rv);
        //设置布局管理器
//        rv.setlayoutmanager(new linearlayoutmanager(this));//线性
        rv.setlayoutmanager(new gridlayoutmanager(this,4));//线性
//        rv.setlayoutmanager(new staggeredgridlayoutmanager(4,staggeredgridlayoutmanager.vertical));//线性
        adapter = new rvadapter1(this,initdata());
        adapter.setonitemclicklistener(new rvadapter1.onitemclicklistener() {
            @override
            public void onitemclick(recyclerview parent, view view, int position, string data) {
                toast.maketext(mainactivity.this, data, toast.length_short).show();
            }
        });

        rv.setadapter(adapter);
    }
    public static arraylist<string> initdata(){
        arraylist<string> arraylist = new arraylist<>();
        for (int i=0;i<50;i++){
            arraylist.add("第"+i+"条数据");
        }
        return arraylist;
    }
}