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 不会配置的点这里….滑稽
• 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'

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

    <?xml version="1.0" encoding="utf-8"?>    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"                  android:layout_width="match_parent"                  android:layout_height="100dp"                  android:background="#7dd9da"                  android:gravity="center_vertical"                  android:orientation="horizontal">        <ImageView            android:id="@+id/iv_news_des"            android:layout_width="80dp"            android:layout_height="80dp"            android:layout_marginStart="10dp"            android:scaleType="centerCrop"            android:src="@mipmap/ic_launcher"/>        <TextView            android:id="@+id/tv_news_title"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginStart="10dp"            android:ellipsize="end"            android:maxLines="1"            android:text="震惊...."            android:textColor="#AA000000"            android:textSize="20sp"            />    </LinearLayout>

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?    )

5.adapter(*重要)

    /**     * description：RecyclerView的adapter     * author feiyang     * create at 2017/8/3 17:41     */    class NewsAdapter : RecyclerView.Adapter    <NewsAdapter.ViewHolder> {        private var context: Context? = null        private var newsList: ArrayList<News>? = null        //这是构造方法        constructor(context: Context, newsList: ArrayList<News>) {            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<News>): 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<News>): Unit {            if (dataList.size==0) {                return            }            newsList?.clear()            newsList?.addAll(dataList)            notifyDataSetChanged()        }    }

最后

核心代码就在上面了,如果想要完整代码的话,去这里下载 不要积分….