为RecycleView添加ContextMenu支持

最近实现了如下的长按删除功能，运用了上下文菜单，在ListView和GrideView上运用正常，但是在RecyclerView上就不行了(可以弹出上下文菜单，但是点击菜单item会报空指针异常:MenuInfo为null),上网一顿搜索，才知道RecyclerView没有实现对ContextMenu的支持，那只好自己去实现了。

首先，创建一个类继承RecyclerView并去实现支持上下文菜单的方法:

1.publicAdapterView.AdapterContextMenuInfogetContextMenuInfo()

2.publicbooleanshowContextMenuForChild(View originalView)

/** * Description: 实现内容菜单支持的RecyclerView * Created by Z on 2017/9/14. */public class RecyclerViewImplementsContextMenu extends RecyclerView {    private AdapterView.AdapterContextMenuInfo contextMenuInfo;    public RecyclerViewImplementsContextMenu(Context context) {        super(context);    }    public RecyclerViewImplementsContextMenu(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);    }    public RecyclerViewImplementsContextMenu(Context context, @Nullable AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    @Override    public AdapterView.AdapterContextMenuInfo getContextMenuInfo() {        return contextMenuInfo;    }    @Override    public boolean showContextMenuForChild(View originalView) {        int position = getChildAdapterPosition(originalView);        long longId = getChildItemId(originalView);        contextMenuInfo = new AdapterView.AdapterContextMenuInfo(originalView,position,longId);        return super.showContextMenuForChild(originalView);    }}

然后，就没有然后啦，直接用就可以了(哈哈哈哈哈，嗝...)

在用到的地方去实现这两个方法就行了:

@Overridepublic void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {    super.onCreateContextMenu(menu, v, menuInfo);    getMenuInflater().inflate(R.menu.menu_delecte_content,menu);}@Overridepublic boolean onContextItemSelected(MenuItem item) {     doSomething();    return super.onContextIteSelected(item);}

当然，千万千万不要忘记去注册咱们的ContextMenu

registerForContextMenu(View view);

最后，感谢网上大佬们的分享，贴个参考链接: 此处是参考原文