Android使用Kotlin实现多节点进度条

时间轴主要使用Recyclerview来实现。开发语言使用Kotlin，代码相对java少了许多也简洁许多

源代码下载地址

效果图：

MainActivity.kt

package com.example.lee.linenode

import android.annotation.SuppressLint
import android.os.Build
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.v7.widget.LinearLayoutManager
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.item_line_node.view.*

class MainActivity : AppCompatActivity() {
 private var list = arrayListOf()
 private var lineNodeAdapter: LineNodeAdapter? = null
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 setContentView(R.layout.activity_main)
 initRecyclerView()
 }

 private fun initRecyclerView() {
 getData()
 //创建一个继承于抽象类(LineNodeAdapter)的实例
 lineNodeAdapter = object : LineNodeAdapter(this, list) {
  override fun convert(viewHolder: LineNodeViewHolder, t: StepBean) {
  viewHolder.itemView.title_txt.text = t.title
  viewHolder.itemView.time_txt.text = t.time
  viewHolder.itemView.num_txt.text = t.num.toString()
  if (t.num == 1) {
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
   viewHolder.itemView.left_view.background = null
   }
  }
  if (t.num == 4) {
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
   viewHolder.itemView.right_view.background = null
   }
  }
  if (t.num < 3) viewHolder.itemView.num_txt.setBackgroundResource(R.drawable.shap_line_number_circle_red)
  }

 }
 val linearLayoutManager = LinearLayoutManager(this)
 linearLayoutManager.orientation = LinearLayoutManager.HORIZonTAL
 //使用来自主代码集的 R.layout.activity_main,而不是 findViewById(R.id.ln_recycler_view) as Recyclerview
 ln_recycler_view.layoutManager = linearLayoutManager
 ln_recycler_view.adapter = lineNodeAdapter
 }

 private fun getData() {
 for (i in 1..4) {
  list.add(StepBean(i, "2017-9-27n17:1$i", "步骤$i"))
 }


 }
}

activity_main.xml

LineNodeAdapter.kt //RecyclerView的适配器

package com.example.lee.linenode

import android.content.Context
import android.support.v7.widget.RecyclerView
import android.support.v7.widget.RecyclerView.Adapter
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import kotlinx.android.synthetic.main.item_line_node.view.*


abstract class LineNodeAdapter(val context: Context, val list: List) : Adapter() {
 override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): LineNodeViewHolder {
 return LineNodeViewHolder(LayoutInflater.from(context).inflate(R.layout.item_line_node, parent, false))
 }

 override fun onBindViewHolder(viewHolder: LineNodeViewHolder, position: Int) {
 convert(viewHolder, list.get(position))
 }


 abstract fun convert(viewHolder: LineNodeViewHolder, t: T)

 override fun getItemCount(): Int {
 return list.size
 }

 class LineNodeViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
 }
}

item_line_node.xml //这个文件是时间轴item的布局文件

StepBean.kt //时间节点实体类

package com.example.lee.linenode


class StepBean(var num: Int, var time: String, var title: String)//直接在主构造函数里声明属性

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