自定义View: 九宫格图形解锁（Kotlin版）

效果：

代码：

package com.example.kotlin_testimport android.content.Context
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.util.AttributeSet
import android.view.MotionEvent
import android.view.View/*** Created by wanglx on 2021/9/8.*/
class MyLock : View {private var isInit=falseprivate var mPoints:Array<Array<Point?>> = Array(3){Array<Point?>(3){null} }private var mSelectPoints=ArrayList<Point>()private var isTouch=falseprivate var code= listOf(0,1,2,5,8)//画笔private lateinit var mNormalPaint:Paintprivate lateinit var mPressedPaint:Paintprivate lateinit var mErrorPaint: Paintprivate lateinit var mLinePaint: Paint//颜色private val mNormalColor=Color.BLACKprivate val mPressedColor=Color.GREENprivate val mErrorColor=Color.REDprivate val mLineColor=Color.BLACK//外圆半径private var mDotRadius=0constructor(context: Context) : super(context)constructor(context: Context, attrs: AttributeSet) : super(context, attrs)constructor(context: Context, attrs: AttributeSet, defaultStyle: Int):super(context,attrs,defaultStyle)override fun onDraw(canvas: Canvas?) {//初始化if (!isInit) {initDot()initPaint()isInit=true}//绘制drawShow(canvas)}private fun drawShow(canvas: Canvas?) {for (i in 0..2) {for (j in 0..2) {var point = mPoints[i][j]when(point!!.status){PointStatus.NORMAL->{//先画外圆，再画内圆canvas!!.drawCircle(point.centerX,point.centerY,mDotRadius.toFloat(),mNormalPaint)canvas!!.drawCircle(point.centerX,point.centerY,mDotRadius.toFloat()/6,mNormalPaint)}PointStatus.PRESSED->{canvas!!.drawCircle(point.centerX,point.centerY,mDotRadius.toFloat(),mPressedPaint)canvas!!.drawCircle(point.centerX,point.centerY,mDotRadius.toFloat()/6,mPressedPaint)}PointStatus.ERROR->{canvas!!.drawCircle(point.centerX,point.centerY,mDotRadius.toFloat(),mErrorPaint)canvas!!.drawCircle(point.centerX,point.centerY,mDotRadius.toFloat()/6,mErrorPaint)}}}}//画连线drawLine(canvas)}private fun drawLine(canvas: Canvas?) {if (mSelectPoints.size > 0) {var mLastPoint = mSelectPoints[0]//两点连线if (mSelectPoints.size > 1) {for (i in 1..mSelectPoints.size-1) {var point = mSelectPoints[i]realDrawLine(mLastPoint, point, canvas, mLinePaint)mLastPoint=point}}//手指和某个点的连线var isInner=checkInRound(mLastPoint.centerX,mLastPoint.centerY,movingX,movingY,mDotRadius/6)if (!isInner&&isTouch) {realDrawLine(mLastPoint,Point(movingX,movingY,-1),canvas,mLinePaint)}}}private fun realDrawLine(mLastPoint: Point,point: Point,canvas: Canvas?,mLinePaint: Paint) {//不是从圆心坐标开始画，而是距离圆心有一定的距离var dx=point.centerX-mLastPoint.centerXvar dy=point.centerY-mLastPoint.centerYvar pointDistance = Math.sqrt((dx * dx + dy * dy).toDouble())var offsetX = (dx / pointDistance) * (mDotRadius / 6)var offsetY=(dy/pointDistance)*(mDotRadius/6)canvas!!.drawLine((mLastPoint.centerX+offsetX).toFloat(),(mLastPoint.centerY+offsetY).toFloat(),(point.centerX-offsetX).toFloat(), (point.centerY-offsetY).toFloat(),mLinePaint)}private var movingX=0fprivate var movingY=0foverride fun onTouchEvent(event: MotionEvent?): Boolean {movingX=event!!.xmovingY=event.ywhen (event.action) {MotionEvent.ACTION_DOWN->{for (i in 0..mSelectPoints.size - 1) {mSelectPoints[i].setStatusNormal()}mSelectPoints.clear()invalidate()//先判断是不是在圆内var dd=pointif (dd != null) {dd.setStatusPressed()mSelectPoints.add(dd)isTouch=true}}MotionEvent.ACTION_MOVE->{//先判断是不是在圆内var dd=pointif (dd != null) {dd.setStatusPressed()if (!mSelectPoints.contains(dd)) {mSelectPoints.add(dd)}}}MotionEvent.ACTION_UP->{isTouch=falseif (mSelectPoints.size == code.size) {for (i in 0..mSelectPoints.size - 1) {if (mSelectPoints[i].index != code[i]) {for (i in 0..mSelectPoints.size - 1) {//密码不对，设置为错误状态mSelectPoints[i].setStatusError()}break}}} else {for (i in 0..mSelectPoints.size - 1) {mSelectPoints[i].setStatusError()}}}}invalidate()return true}//扩展属性，遍历九个圆，看手指的按在哪个圆里面val point:Point?get() {for (i in 0..2) {for (j in 0..2) {var point = mPoints[i][j]if (checkInRound(point!!.centerX, point.centerY, movingX, movingY, mDotRadius)) {return point}}}return null}//判断是不是在圆内private fun checkInRound(centerX: Float,centerY: Float,movingX: Float,movingY: Float,mDotRadius: Int): Boolean {var isIn=Math.sqrt(((centerX-movingX)*(centerX-movingX)+(centerY-movingY)*(centerY-movingY)).toDouble())<mDotRadiusreturn isIn}private fun initPaint() {//正常画笔mNormalPaint = Paint()mNormalPaint!!.color=mNormalColormNormalPaint.style=Paint.Style.STROKEmNormalPaint.isAntiAlias=truemNormalPaint.strokeWidth=mDotRadius.toFloat()/12//按下画笔mPressedPaint = Paint()mPressedPaint!!.color=mPressedColormPressedPaint.style=Paint.Style.STROKEmPressedPaint.isAntiAlias=truemPressedPaint.strokeWidth=mDotRadius.toFloat()/9//错误画笔mErrorPaint = Paint()mErrorPaint!!.color=mErrorColormErrorPaint.style=Paint.Style.STROKEmErrorPaint.isAntiAlias=truemErrorPaint.strokeWidth=mDotRadius.toFloat()/12//连线画笔mLinePaint = Paint()mLinePaint!!.color=mLineColormLinePaint.style=Paint.Style.STROKEmLinePaint.isAntiAlias=truemLinePaint.strokeWidth=mDotRadius.toFloat()/12}private fun initDot() {var width=this.widthvar height=this.heightvar offsetX=0f//九个宫格为正方形，距离布局左边的距离var offsetY=0f//九宫格为正方形，距离布局顶部的距离//兼容横竖屏if (width > height) {offsetX = (width - height).toFloat() / 2width = height} else {offsetY = (height - width).toFloat() / 2}//每个方格的大小var squareWidth=width/3mDotRadius=squareWidth/4//九个宫格，存于数组Point[3][3]mPoints[0][0] = Point(squareWidth/2+offsetX,squareWidth/2+offsetY,0)mPoints[0][1] = Point(squareWidth*3/2+offsetX,squareWidth/2+offsetY,1)mPoints[0][2] = Point(squareWidth*5/2+offsetX,squareWidth/2+offsetY,2)mPoints[1][0] = Point(squareWidth/2+offsetX,squareWidth*3/2+offsetY,3)mPoints[1][1] = Point(squareWidth*3/2+offsetX,squareWidth*3/2+offsetY,4)mPoints[1][2] = Point(squareWidth*5/2+offsetX,squareWidth*3/2+offsetY,5)mPoints[2][0] = Point(squareWidth/2+offsetX,squareWidth*5/2+offsetY,6)mPoints[2][1] = Point(squareWidth*3/2+offsetX,squareWidth*5/2+offsetY,7)mPoints[2][2] = Point(squareWidth*5/2+offsetX,squareWidth*5/2+offsetY,8)}//圆的状态enum class PointStatus{NORMAL,PRESSED,ERROR}class Point(var centerX: Float, var centerY: Float, var index: Int){//默认状态var status = PointStatus.NORMALfun setStatusNormal() {status=PointStatus.NORMAL}fun setStatusPressed() {status=PointStatus.PRESSED}fun setStatusError() {status=PointStatus.ERROR}}}

布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><com.example.kotlin_test.MyLockandroid:layout_width="match_parent"android:layout_height="match_parent" />
</LinearLayout>

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