Kotlin和RecyclerView的一个demo

Kotlin最近比较火,我简单学了一下,写了个小demo,RecyclerView的.

1.使用到的东西

语言:Kotlin

RecyclerView

OkHttp3

RxJava

RxAndroid

Glide

Gson

2.需要引入的库

implementation 'com.android.support:recyclerview-v7:26.0.0'implementation 'com.squareup.okhttp3:okhttp:3.8.1'implementation 'io.reactivex.rxjava2:rxjava:2.1.2'implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'implementation 'com.google.code.gson:gson:2.8.1'implementation 'com.github.bumptech.glide:glide:4.0.0'复制代码

3.首先来看一下RecyclerView子项的布局吧

item_news.xml 就是一个ImageView和一个TextView

4.model,模型类

/**	 * description：	 * author feiyang	 * create at 2017/8/3 17:37	 */	data class News(		        @SerializedName("author_name")	        var authorName: String?,	        @SerializedName("category")	        var category: String?,	        @SerializedName("date")	        var date: String?,	        @SerializedName("thumbnail_pic_s")	        var thumbnailPicS: String?,	        @SerializedName("title")	        var title: String?,	        @SerializedName("uniquekey")	        var uniquekey: String?,	        @SerializedName("url")	        var url: String?		)复制代码

5.adapter(*重要)

/**	 * description：RecyclerView的adapter	 * author feiyang	 * create at 2017/8/3 17:41	 */	class NewsAdapter : RecyclerView.Adapter	
    
      {		    private var context: Context? = null	    private var newsList: ArrayList
     
      ? = null		    //这是构造方法	    constructor(context: Context, newsList: ArrayList
      
       ) {	        this.context = context	        this.newsList = newsList	    }		    class ViewHolder : RecyclerView.ViewHolder {
     		        var ivDes: ImageView	        var tvTitle: TextView		        constructor(itemView: View) : super(itemView) {	            ivDes = itemView.findViewById(R.id.iv_news_des)	            tvTitle = itemView.findViewById(R.id.tv_news_title)	        }	    }		    override fun onBindViewHolder(holder: ViewHolder?, position: Int) {	        if (newsList?.size as Int > position) {	            val news = newsList?.get(position)	            //使用Glide加载图片	            Glide.with(context).load(news?.thumbnailPicS).into(holder?.ivDes)	            //设置标题	            holder?.tvTitle?.text = news?.title	        }	    }		    override fun getItemCount(): Int {	        return newsList?.size as Int	    }		    override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): ViewHolder {	        val view = LayoutInflater.from(parent?.context).inflate(R.layout.item_news, parent, false)	        return ViewHolder(view)	    }		    /**	     * 添加数据	     */	    fun addData(dataList: ArrayList
       
        ): Unit {	        //这里不用像java一样判断空了,这里肯定是非空的	        if (dataList.size == 0) {	            return	        }	        newsList?.addAll(dataList)	        notifyDataSetChanged()	    }		    /**	     * 更新数据	     */	    fun updateData(dataList: ArrayList
        
         ): Unit {	        if (dataList.size==0) {	            return	        }	        newsList?.clear()	        newsList?.addAll(dataList)	        notifyDataSetChanged()	    }		}复制代码

最后

核心代码就在上面了,如果想要完整代码的话,去不要积分....