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.linenodeimport android.annotation.SuppressLintimport android.os.Buildimport android.support.v7.app.AppCompatActivityimport android.os.Bundleimport android.support.v7.widget.LinearLayoutManagerimport kotlinx.android.synthetic.main.activity_main.*import kotlinx.android.synthetic.main.item_line_node.view.*class MainActivity : AppCompatActivity() { private var list = arrayListOf<StepBean>() private var lineNodeAdapter: LineNodeAdapter<StepBean>? = 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<StepBean>(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

<?xml version='1.0' encoding='utf-8'?><RelativeLayout xmlns:android='http://schemas.android.com/apk/res/android' android:layout_width='match_parent' android:layout_height='match_parent'> <android.support.v7.widget.RecyclerView android: android:layout_width='wrap_content' android:layout_height='wrap_content' android:layout_centerHorizontal='true' /> </RelativeLayout>

LineNodeAdapter.kt //RecyclerView的适配器

package com.example.lee.linenodeimport android.content.Contextimport android.support.v7.widget.RecyclerViewimport android.support.v7.widget.RecyclerView.Adapterimport android.view.LayoutInflaterimport android.view.Viewimport android.view.ViewGroupimport kotlinx.android.synthetic.main.item_line_node.view.*/** * Created by lee on 17-9-27. */abstract class LineNodeAdapter<T>(val context: Context, val list: List<T>) : Adapter<LineNodeAdapter.LineNodeViewHolder>() { 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

<?xml version='1.0' encoding='utf-8'?> <LinearLayout xmlns:android='http://schemas.android.com/apk/res/android' android:layout_width='wrap_content' android:layout_height='wrap_content' android:gravity='center_horizontal' android:orientation='vertical'> <TextView android: android:layout_width='wrap_content' android:layout_height='wrap_content' android:layout_gravity='center_horizontal' android:text='步骤' /> <LinearLayout android:layout_width='wrap_content' android:layout_height='wrap_content' android:layout_gravity='center_horizontal' android:gravity='center_vertical' android:orientation='horizontal'> <View android: android:layout_width='30dp' android:layout_height='1dp' android:layout_centerVertical='true' android:background='#A6A6A6' /> <TextView android: android:layout_width='20dp' android:layout_height='20dp' android:background='@drawable/shap_line_number_circle_grey' android:gravity='center' android:text='1' android:textColor='@color/colorWhite' /> <View android: android:layout_width='30dp' android:layout_height='1dp' android:layout_centerVertical='true' android:background='#A6A6A6' /> </LinearLayout> <TextView android: android:layout_width='wrap_content' android:layout_height='wrap_content' android:layout_gravity='center_horizontal' android:gravity='center_horizontal' android:text='2017-09-27n15:56' /></LinearLayout>

StepBean.kt //时间节点实体类

package com.example.lee.linenode/** * Created by lee on 17-9-27. */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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