阳光沙滩-让学习编程变得更加简单

springdatajpa多表操作之多对多前面我们学习了多表操作之一对多SpringDataJPA多表关系之一对多接下来我们看看多对多什么情况下有多对多关系呢？

2020-03-19 15:28 · 多对多 / SpringData / JPA / 后台 / 数据库

我想问一下如何使用recyclerview实现多种布局，数据是获取本地的json数据，每个json数据的长度是不同的json数据格式：adapter：packageadapter;importandroid.content.Context;importandroid.view.LayoutInflater;importandroid.view.ViewGroup;importandroidx.annotation.NonNull;importandroidx.recyclerview.widget.RecyclerView;importcom.example.testindexfunction.R;importcom.squareup.picasso.Picasso;importjava.util.ArrayList;importjava.util.List;importjson.IndexFunctionJsonBean;importviewholder.IndexMessageViewHolder;importviewholder.IndexTitleViewHolder;publicclassIndexAdapterextendsRecyclerView.Adapter{publicstaticfinalintFUNCTION_TITLE=0;publicstaticfinalintFUNCTION_MESSAGE=1;privateLayoutInflaterlayoutInflater;privateContextcontext;privateList<IndexFunctionJsonBean.IndexBean>indexBeanLists=newArrayList<>();publicIndexAdapter(Contextcontext,List<IndexFunctionJsonBean.IndexBean>indexBeanLists){layoutInflater=LayoutInflater.from(context);this.context=context;this.indexBeanLists=indexBeanLists;}@NonNull@OverridepublicRecyclerView.ViewHolderonCreateViewHolder(@NonNullViewGroupparent,intviewType){if(viewType==FUNCTION_TITLE){returnnewIndexTitleViewHolder(layoutInflater.inflate(R.layout.index_function_titel,parent,false));}elseif(viewType==FUNCTION_MESSAGE){returnnewIndexMessageViewHolder(layoutInflater.inflate(R.layout.index_function_message,parent,false));}returnnull;}@OverridepublicvoidonBindViewHolder(@NonNullRecyclerView.ViewHolderholder,intposition){IndexFunctionJsonBean.IndexBeanindexBean=indexBeanLists.get(position);//得到index里面4个对象的值List<IndexFunctionJsonBean.IndexBean.FunctionBean>indexFunction=indexBean.getFunction();//得到function里面的内容intviewType=getItemViewType(position);switch(viewType){caseFUNCTION_TITLE:IndexTitleViewHolderindexTitleViewHolder=(IndexTitleViewHolder)holder;for(inti=0;i<indexBeanLists.size();i++){indexTitleViewHolder.functionTitle.setText(indexBean.getTitle());}break;caseFUNCTION_MESSAGE:IndexMessageViewHolderindexMessageViewHolder=(IndexMessageViewHolder)holder;for(inti=0;i<indexFunction.size();i++){indexMessageViewHolder.functionName.setText(indexFunction.get(i).getName());Picasso.with(context).load(indexFunction.get(i).getImgurl()).into(indexMessageViewHolder.functionImage);}break;}}@OverridepublicintgetItemCount(){returnindexBeanLists.size();}@OverridepublicintgetItemViewType(intposition){if(position==0){returnFUNCTION_TITLE;}elseif(position==1){returnFUNCTION_MESSAGE;}return0;}}

2020-10-10 14:15 · Androidrecyclerview

[问答] recycleview 多类型点击事件

我recycleview 有两种类型，第一种是添加图片，第二种是图片我现在点击第二种，结果点击事件中postion永远是5（最大数量）不是对应的postion（1,2,3,4,5）我在tupian_holder中添加点击事件打印出来nPostion永远是5不是点击哪个是哪个 itemView.setOnClickListener(newView.OnClickListener(){ @Override publicvoidonClick(Viewv){ Log.d(TAG,"onClick:我点的是第几个 "+nPostion); } });有人能看看我这个postion为啥没变吗？谢谢各位大佬代码如下//根据界面的类型返回不同的界面@NonNull@OverridepublicRecyclerView.ViewHolderonCreateViewHolder(@NonNullViewGroupparent,intviewType){Viewview;if(viewType==TYPE_TITLE){view=LayoutInflater.from(parent.getContext()).inflate(R.layout.item_pic_first,parent,false);returnnewTitleHolder(view);}elseif(viewType==TYPE_TUPIAN){view=LayoutInflater.from(parent.getContext()).inflate(R.layout.item_pic_others,parent,false);returnnewTupianHolder(view);}returnnull;}@OverridepublicvoidonBindViewHolder(@NonNullRecyclerView.ViewHolderholder,intposition){if(position==0){TitleHolder.setData(mData.get(position),position);}else{TupianHolder.setData(mData.get(position),position);}}@OverridepublicintgetItemCount(){if(mData!=null){returnmData.size();}return0;}//返回界面的类型@OverridepublicintgetItemViewType(intposition){if(position==0){returnTYPE_TITLE;}else{returnTYPE_TUPIAN;}}//点击第一个加号的图片，去增加图片publicvoidsetOnAddClickListener(OnAddClickListenerlistener){//设置一个监听，就是需要一个接口,和回调接口this.mOnAddClickListener=listener;}publicinterfaceOnAddClickListener{voidOnAddClick(intposition);}//点击删除图片的接口publicvoidsetOnDelClickListener(OnDelClickListenerlistener){//设置一个监听，就是需要一个接口,和回调接口this.mOnDelClickListener=listener;}publicinterfaceOnDelClickListener{voidOnDelClick(intposition,StringuploadPath);}privatestaticclassTitleHolderextendsRecyclerView.ViewHolder{privatestaticTextViewtv_title=null;privatestaticintmPostion;publicTitleHolder(@NonNullViewitemView){super(itemView);itemView.setOnClickListener(newView.OnClickListener(){@OverridepublicvoidonClick(Viewv){if(mOnAddClickListener!=null){mOnAddClickListener.OnAddClick(mPostion);}}});}publicstaticvoidsetData(PicBeanpicBean,intposition){mPostion=position;}}privatestaticclassTupianHolderextendsRecyclerView.ViewHolder{privatestaticImageViewimageView;privatefinalImageViewimg_cha;privatestaticintnPostion;privatestaticPicBeanmPicBean;publicTupianHolder(@NonNullViewitemView){super(itemView);imageView=itemView.findViewById(R.id.load_img);img_cha=itemView.findViewById(R.id.img_cha);img_cha.setOnClickListener(newView.OnClickListener(){@OverridepublicvoidonClick(Viewv){if(mOnDelClickListener!=null){mOnDelClickListener.OnDelClick(nPostion,mPicBean.upLoadPath);}}});itemView.setOnClickListener(newView.OnClickListener(){@OverridepublicvoidonClick(Viewv){Log.d(TAG,"onClick:我点的是第几个"+nPostion);}});}publicstaticvoidsetData(PicBeanpicBean,intposition){mPicBean=picBean;nPostion=position;imageView.setScaleType(ImageView.ScaleType.FIT_XY);Glide.with(imageView.getContext()).load(picBean.getPicPath()).into(imageView);}}

2020-05-29 10:09 · 安卓