实例 -自定义绘制滑动解锁

效果图：

        

GitHub地址：https://github.com/luofangli/Draw_SlideUnclock

 

全部代码：

1：

 

<?<androidx.constraintlayout.widget.ConstraintLayout    android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".MainActivity">

 <com.example.my.SlideUnlock
  android:layout_width="200dp"
  android:layout_height="200dp"
  android:background="@color/design_default_color_primary"
  app:layout_constraintBottom_toBottomOf="parent"
  app:layout_constraintEnd_toEndOf="parent"
  app:layout_constraintHorizontal_bias="0.445"
  app:layout_constraintStart_toStartOf="parent"
  app:layout_constraintTop_toTopOf="parent"
  app:layout_constraintVertical_bias="0.499" />
</androidx.constraintlayout.widget.ConstraintLayout>


2：

 

 

package com.example.my

import android.graphics.Color
import android.graphics.Paint
import android.graphics.Rect

class Dot(x: Float, y: Float,radius:Float,tag:Int) {
 //点的中心位置
 val cx = x
 val cy = y
 //圆点的半径
 val cradius = radius
 //标记圆点的tag值
 val ctag = tag
 //是否已被点亮
 var isOrHeightlight = false
 //圆点的画笔
 var paint = Paint().apply {
  style = Paint.Style.STROKE
  color = Color.BLACK
  strokeWidth = 5f
 }
 //圆点的矩形
 var rect = Rect((cx-cradius).toInt(),(cy-cradius).toInt(),
   (cx+cradius).toInt(),(cy+cradius).toInt())
 //设置圆点的画笔
 fun setPaint(color:Int){
  paint.color = color
 }
}


3：

package com.example.my

import android.content.Context
import android.graphics.*
import android.util.AttributeSet
import android.util.Log
import android.view.MotionEvent
import android.view.View
import androidx.core.graphics.contains

class SlideUnlock: View {
 //存放9个点
 private val dots = mutableListOf<Dot>()
 //存放被点亮的点
 private val heightlightdots = mutableListOf<Dot>()
 //圆点的中心点的位置
 private var cx = 0f
 private var cy = 0f
 private var radius = 0f
 //记录线条的开始位置
 private var startX = 0f
 private var startY = 0f
 //线条的末端位置
 private var endX = 0f
 private var endY = 0f
 //没有连接两个点的线的路径
 private var path = Path()
 //画线条的画笔
 private val paintline:Paint by lazy {
  Paint().apply {
   style = Paint.Style.STROKE
   color = Color.RED
   strokeWidth = 5f
  }
 }
 //画圆点的画笔
 private val paint:Paint by lazy {
  Paint().apply {
   style = Paint.Style.STROKE
   strokeWidth = 5f
   color = Color.BLACK
  }
 }
 //代码创建
 constructor(context: Context):super(context){}
 // constructor(context: Context,attributeSet: AttributeSet):super(context,attributeSet){}

 override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
  super.onSizeChanged(w, h, oldw, oldh)
  dot()
 }

 override fun onDraw(canvas: Canvas?) {
  super.onDraw(canvas)
  drawdot(canvas)
  canvas?.drawLine(startX,startY,endX,endY,paintline)
  drawlineIn2Dot(canvas)
 }

 override fun onTouchEvent(event: MotionEvent?): Boolean {
  when(event?.action){
   MotionEvent.ACTION_DOWN->{
    //点亮圆点
    heighlightDot(Point(event.x.toInt(), event.y.toInt())).also {
      if (it!=null){
       heithliget(it)
       //将其设置为已被点亮
       it.isOrHeightlight = true

      }
    }
   }
   MotionEvent.ACTION_MOVE->{
    //点亮圆点
    heighlightDot(Point(event.x.toInt(), event.y.toInt())).also {
     if (it!=null){
      //点亮点
      heithliget(it)
      //改变点是否已被加入被点亮数组的状态
      it.isOrHeightlight = true
      invalidate()
     }
     movePath(Point(event.x.toInt(),event.y.toInt()))
    }
   }
   MotionEvent.ACTION_UP->{
    //恢复原状
    originalState()
   }
  }
  return true
 }
 //在两个被点亮之间的画一条线
 private fun drawlineIn2Dot(canvas: Canvas?){
  if (heightlightdots.size>1){
   for (i in 0 until heightlightdots.size-1){
    canvas?.drawLine(heightlightdots[i].cx,heightlightdots[i].cy,
    heightlightdots[i+1].cx,heightlightdots[i+1].cy,paintline)
   }
  }
 }
 //返回被触摸的点
 private fun heighlightDot(point: Point):Dot?{
  for (dot in dots){
   if (dot.rect.contains(point)){
    return dot
   }
  }
  return null
 }
 //点亮点
 private fun heithliget(dot: Dot){
  dot.setPaint(Color.RED)
  //将被点亮的点记录
  //判断是否已经被点亮了
  if (dot.isOrHeightlight == false){
  heightlightdots.add(dot)

  }
  invalidate()
 }
 //设置最后一个亮点移动的线的路径
 private fun movePath(point: Point){
   val i =heightlightdots.size
  Log.v("lfl","最后路线")
   startX = heightlightdots[i-1].cx
   startY = heightlightdots[i-1].cy
   endX = point.x.toFloat()
   endY= point.y.toFloat()
   invalidate()
 }
 //恢复原状
 private fun originalState(){
  for (dot in heightlightdots){
   dot.setPaint(Color.BLACK)
   dot.isOrHeightlight = false
   invalidate()
  }
  heightlightdots.clear()
  //消去最后一根线
  startX = 0f
  startY = 0f
  endX = 0f
  endY = 0f
 }
 //将9个点准备好
 private fun dot(){
  radius = if (measuredHeight>measuredWidth){
   measuredWidth/14f
  }else{
   measuredHeight/14f
  }
  for (row in 0..2){
   for (clum in 0..2){
    cx = (clum*4+3)*radius
    cy = (row*4+3)*radius
    Dot(cx,cy,radius,row*10+clum).also {
     dots.add(it)
    }
   }
  }
 }
 //画9个点
 private fun drawdot(canvas: Canvas?){
  for (dot in dots){
   canvas?.drawCircle(dot.cx,dot.cy,dot.cradius,dot.paint)
  }
 }
}

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效果图：GitHub地址：https://github.com/luofangli/Draw_SlideUnclock全部代码：1：<?<androidx.constraintlayout.widget.ConstraintLayoutandroid:layout_width="match_parent"android:layout_height="mat
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