怎么在Android中自定义一个控件？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
class SleepDayChart(context: Context, attrs: AttributeSet?) : View(context, attrs) {
//屏幕宽高
private var scrWidth = 0f
private var scrHeight = 0f
private var xData: Array<String> = arrayOf("20:00", "02:00", "08:00", "14:00", "20:00")
private var sleepsData: Sleep? = null
private lateinit var paintLine: Paint
private lateinit var paintGradientLine: Paint
private lateinit var paintXText: Paint
private lateinit var paintSleep: Paint
private lateinit var paintPillar: Paint
private lateinit var paintRound: Paint
private lateinit var paintBessel: Paint
private var xSlider = 0f //滑块的x轴位置
private var mPath: Path
private val curveCircleRadius = 12f.dp
// the coordinates of the first curve
private val mFirstCurveStartPoint = Point()
private val mFirstCurveEndPoint = Point()
private val mFirstCurveControlPoint1 = Point()
private val mFirstCurveControlPoint2 = Point()
//the coordinates of the second curve
private var mSecondCurveStartPoint = Point()
private val mSecondCurveEndPoint = Point()
private val mSecondCurveControlPoint1 = Point()
private val mSecondCurveControlPoint2 = Point()
init {
setLayerType(LAYER_TYPE_SOFTWARE, null)
mPath = Path()
initPaint()
}
/**
* 初始化画笔
*/
private fun initPaint() {
paintLine = Paint()
paintLine.style = Paint.Style.STROKE
paintLine.strokeWidth = 1f
paintLine.color = context.colorCompat(R.color.e6e6e6_2e2e2e)
paintGradientLine = Paint()
paintGradientLine.style = Paint.Style.STROKE
paintGradientLine.strokeWidth = 1f
paintXText = Paint()
paintXText.isAntiAlias = true
paintXText.strokeWidth = 1f
paintXText.textSize = 12f.sp
paintXText.textAlign = Paint.Align.CENTER
paintXText.color = context.colorCompat(R.color.color_on_surface)
paintSleep = Paint()
paintSleep.style = Paint.Style.FILL
paintSleep.isAntiAlias = true
paintSleep.color = context.colorCompat(R.color.blue_7fbeff)
paintPillar = Paint()
paintPillar.style = Paint.Style.FILL
paintPillar.isAntiAlias = true
paintPillar.color = context.colorCompat(R.color.blue_7fbeff)
paintRound = Paint()
paintRound.style = Paint.Style.FILL
paintRound.isAntiAlias = true
paintRound.color = context.colorCompat(R.color.ffffff_6e6e6e)
paintBessel = Paint()
paintBessel.style = Paint.Style.FILL
paintBessel.isAntiAlias = true
paintBessel.color = context.colorCompat(R.color.f2f2f2_1d1d1d)
}
override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
super.onSizeChanged(w, h, oldw, oldh)
scrWidth = width.toFloat()
scrHeight = height.toFloat()
ySpacing = scrHeight / 8f //y轴分8份
//底部圆滑块可以滑动的范围
xWithStart = margin * 3
xWithEnd = scrWidth - margin * 3
xSlider = scrWidth / 2
xSpacing = (xWithEnd - xWithStart) / (xData.size - 1)
}
override fun dispatchTouchEvent(ev: MotionEvent?): Boolean {
parent.requestDisallowInterceptTouchEvent(true)
return super.dispatchTouchEvent(ev)
}
private var mDownX = 0f
private var mDownY = 0f
private var isSlider = false
@SuppressLint("ClickableViewAccessibility")
override fun onTouchEvent(event: MotionEvent): Boolean {
when (event.action) {
MotionEvent.ACTION_DOWN -> {
mDownX = event.x
mDownY = event.y
isSlider = abs(event.x - xSlider) < 60f && abs(event.y - ySpacing * 7) < 60f
return isSlider
}
MotionEvent.ACTION_MOVE ->
if (abs(event.y - mDownY) < abs(event.x - mDownX)) {
if (isSlider) {
xSlider = event.x
if (xSlider < xWithStart) {
xSlider = xWithStart
}
if (xSlider > xWithEnd) {
xSlider = xWithEnd
}
invalidate()
}
}
MotionEvent.ACTION_UP -> {
if (!isSlider) {
if (abs(event.x - mDownX) < curveCircleRadius) {
xSlider = event.x
invalidate()
}
}
}
}
return true
}
private val margin = 20f.dp //左右两边距离
private var xWithStart = 0f //x轴的起始点
private var xWithEnd = 0f //x轴结束点
private var ySpacing = 0f //高度分割份数后间距
private var xSpacing = 0f //x轴分割份数后间距
@SuppressLint("DrawAllocation")
override fun onDraw(canvas: Canvas) {
super.onDraw(canvas)
//画柱子
drawPillar(canvas)
//垂直渐变线
drawGradientLine(canvas)
//底部
drawBessel(canvas)
//画x轴方向文字
drawX(canvas)
}
private fun drawX(canvas: Canvas) {
if (sleepsData == null) {
xData.forEachIndexed { index, s ->
val x = xWithStart + xSpacing * index
val dis = abs(x - xSlider)
var y = ySpacing * 7 - 10f.dp
if (dis < xSpacing / 2) {
paintXText.typeface = Typeface.DEFAULT_BOLD
y -= 10f.dp * (1 - dis / xSpacing)
} else {
paintXText.typeface = Typeface.DEFAULT
}
canvas.drawText(s, x, y, paintXText)
if (index == 0) {
canvas.drawText(startDay, x, y - 12f.dp, paintXText)
}
if (index == xData.size - 1) {
canvas.drawText(endDay, x, y - 12f.dp, paintXText)
}
}
} else {
sleepsData?.let {
val start = DateTime(it.items[0].timeStamp * 1000)
val asleep = start.hourOfDay * 60 + start.minuteOfHour
val end = DateTime(it.items.last().timeStamp * 1000)
val wakeUp = end.hourOfDay * 60 + end.minuteOfHour + it.items.last().duration
val s1 =
"${context.getString(R.string.bed_time)} ${asleep / 60}:${if (asleep % 60 < 10) "0" else ""}${asleep % 60}"
val dis1 = abs(xWithStart + paintXText.measureText(s1) / 2 - xSlider)
var y1 = ySpacing * 7 - 10f
if (dis1 < curveCircleRadius * 3) {
paintXText.typeface = Typeface.DEFAULT_BOLD
var temp = 1 - dis1 / curveCircleRadius * 2
if (temp < 0f || temp > 1f) {
temp = 1f
}
y1 -= 60f * temp
} else {
paintXText.typeface = Typeface.DEFAULT
}
canvas.drawText(s1, xWithStart, y1, paintXText)
canvas.drawText(startDay, xWithStart, y1 - 40f, paintXText)
val hour = "${if (wakeUp / 60 < 10) "0" else ""}${wakeUp / 60}"
val minute = "${if (wakeUp % 60 < 10) "0" else ""}${wakeUp % 60}"
val s2 =
"${context.getString(R.string.rise_time)} $hour:$minute"
val dis2 = abs(xWithEnd - paintXText.measureText(s2) / 2 - xSlider)
var y2 = ySpacing * 7 - 10f
if (dis2 < curveCircleRadius * 3) {
paintXText.typeface = Typeface.DEFAULT_BOLD
y2 -= 60f * (1 - dis2 / (xSlider - curveCircleRadius * 3))
} else {
paintXText.typeface = Typeface.DEFAULT
}
canvas.drawText(s2, xWithEnd, y2, paintXText)
canvas.drawText(endDay, xWithEnd, y2 - 40f, paintXText)
}
}
}
private fun drawPillar(canvas: Canvas) {
var top = 0f
var bottom = 0f
var preDuration = 0 //前一状态时长
var duration = 0 //时间累加
var tempTop = 0f
var tempBottom: Float
var startColor = 0
var endColor = 0
val colors = intArrayOf(startColor, endColor)
sleepsData?.let {
it.items.forEachIndexed { index, item ->
when (item.status) {
3, 4 -> { //清醒
endColor = Color.parseColor("#fdc221")
paintSleep.color = Color.parseColor("#fdc221")
paintPillar.color = Color.parseColor("#f9eec1")
top = 1f
bottom = 2f
}
12 -> { //快速眼动
endColor = Color.parseColor("#fd817c")
paintSleep.color = Color.parseColor("#fd817c")
paintPillar.color = Color.parseColor("#4dfd817c")
top = 2f
bottom = 3f
}
0, 1 -> { //浅
endColor = Color.parseColor("#c64be4")
paintSleep.color = Color.parseColor("#c64be4")
paintPillar.color = Color.parseColor("#e8c3f1")
top = 3f
bottom = 4f
}
2 -> { //深
endColor = Color.parseColor("#8a2be2")
paintSleep.color = Color.parseColor("#8a2be2")
paintPillar.color = Color.parseColor("#d6b9f1")
top = 4f
bottom = 5f
}
}
if (xSlider < xWithStart + xSpacing * (duration + item.duration) && xSlider > xWithStart + xSpacing * duration) {
onDaySelectListener?.invoke(index, item)
canvas.drawRect(
RectF(
xWithStart + xSpacing * duration,
ySpacing * top + 10f,
xWithStart + xSpacing * (duration + item.duration),
ySpacing * 7
), paintPillar
)
}
canvas.drawRoundRect(
RectF(
xWithStart + xSpacing * duration - 1f,
ySpacing * top,
xWithStart + xSpacing * (duration + item.duration) + 1f,
ySpacing * bottom
), 10f, 10f, paintSleep
)
if (index > 0 && index < it.items.size) {
if (tempTop < top) {
tempTop += 0.9f
tempBottom = bottom - 0.9f
colors[0] = startColor
colors[1] = endColor
if (xSpacing * preDuration > 10f) {
val path2 = Path()
path2.moveTo(xWithStart + xSpacing * duration, ySpacing * tempTop)
path2.lineTo(
xWithStart + xSpacing * duration - 8f,
ySpacing * tempTop + 6f
)
path2.lineTo(xWithStart + xSpacing * duration, ySpacing * tempTop + 12f)
path2.close()
paintSleep.color = startColor
canvas.drawPath(path2, paintSleep)
}
if (xSpacing * item.duration > 10f) {
val path3 = Path()
path3.moveTo(xWithStart + xSpacing * duration, ySpacing * tempBottom)
path3.lineTo(
xWithStart + xSpacing * duration + 8f,
ySpacing * tempBottom - 6f
)
path3.lineTo(
xWithStart + xSpacing * duration,
ySpacing * tempBottom - 12f
)
path3.close()
paintSleep.color = endColor
canvas.drawPath(path3, paintSleep)
}
} else {
tempBottom = tempTop + 0.1f
tempTop = bottom - 0.1f
colors[0] = endColor
colors[1] = startColor
if (xSpacing * preDuration > 10f) {
val path2 = Path()
path2.moveTo(xWithStart + xSpacing * duration, ySpacing * tempBottom)
path2.lineTo(
xWithStart + xSpacing * duration - 8f,
ySpacing * tempBottom - 6f
)
path2.lineTo(
xWithStart + xSpacing * duration,
ySpacing * tempBottom - 12f
)
path2.close()
paintSleep.color = startColor
canvas.drawPath(path2, paintSleep)
}
if (xSpacing * item.duration > 10f) {
val path3 = Path()
path3.moveTo(xWithStart + xSpacing * duration, ySpacing * tempTop)
path3.lineTo(
xWithStart + xSpacing * duration + 8f,
ySpacing * tempTop + 6f
)
path3.lineTo(xWithStart + xSpacing * duration, ySpacing * tempTop + 12f)
path3.close()
paintSleep.color = endColor
canvas.drawPath(path3, paintSleep)
}
}
val mLinearGradient = LinearGradient(
xWithStart + xSpacing * duration,
ySpacing * tempTop,
xWithStart + xSpacing * duration,
ySpacing * tempBottom, colors, null, Shader.TileMode.MIRROR
)
paintGradientLine.shader = mLinearGradient
canvas.drawLine(
xWithStart + xSpacing * duration,
ySpacing * tempTop,
xWithStart + xSpacing * duration,
ySpacing * tempBottom,
paintGradientLine
)
}
tempTop = top
tempBottom = bottom
preDuration = item.duration
duration += item.duration
startColor = endColor
}
}
}
private fun drawBessel(canvas: Canvas) {
// 第一条曲线开始点
mFirstCurveStartPoint[(xSlider - curveCircleRadius * 3).toInt()] = (ySpacing * 7).toInt()
// 第一条曲线结束点
mFirstCurveEndPoint[xSlider.toInt()] =
(ySpacing * 7 - curveCircleRadius - curveCircleRadius / 4).toInt()
// 第二条开始点
mSecondCurveStartPoint = mFirstCurveEndPoint
mSecondCurveEndPoint[(xSlider + curveCircleRadius * 3).toInt()] = (ySpacing * 7).toInt()
// 第一条控制点
mFirstCurveControlPoint1[(mFirstCurveStartPoint.x + curveCircleRadius + curveCircleRadius / 4).toInt()] =
mFirstCurveStartPoint.y
mFirstCurveControlPoint2[(mFirstCurveEndPoint.x - curveCircleRadius * 2 + curveCircleRadius).toInt()] =
mFirstCurveEndPoint.y
// 第二条控制点
mSecondCurveControlPoint1[(mSecondCurveStartPoint.x + curveCircleRadius * 2 - curveCircleRadius).toInt()] =
mSecondCurveStartPoint.y
mSecondCurveControlPoint2[(mSecondCurveEndPoint.x - curveCircleRadius - curveCircleRadius / 4).toInt()] =
mSecondCurveEndPoint.y
mPath.reset()
mPath.moveTo(0f, ySpacing * 7)
mPath.lineTo(mFirstCurveStartPoint.x.toFloat(), mFirstCurveStartPoint.y.toFloat())
mPath.cubicTo(
mFirstCurveControlPoint1.x.toFloat(), mFirstCurveControlPoint1.y.toFloat(),
mFirstCurveControlPoint2.x.toFloat(), mFirstCurveControlPoint2.y.toFloat(),
mFirstCurveEndPoint.x.toFloat(), mFirstCurveEndPoint.y.toFloat()
)
mPath.cubicTo(
mSecondCurveControlPoint1.x.toFloat(), mSecondCurveControlPoint1.y.toFloat(),
mSecondCurveControlPoint2.x.toFloat(), mSecondCurveControlPoint2.y.toFloat(),
mSecondCurveEndPoint.x.toFloat(), mSecondCurveEndPoint.y.toFloat()
)
mPath.lineTo(scrWidth, ySpacing * 7)
mPath.lineTo(scrWidth, scrHeight)
mPath.lineTo(0f, scrHeight)
mPath.close()
//底部灰色
canvas.drawPath(mPath, paintBessel)
//底部滑块
canvas.drawCircle(xSlider, ySpacing * 7 + 5f, curveCircleRadius, paintRound)
}
private var startDay = ""
private var endDay = ""
fun setValue(value: Sleep?, startDay: String, endDay: String): SleepDayChart {
this.startDay = startDay
this.endDay = endDay
this.sleepsData = value
if (sleepsData == null) {
xSpacing = (xWithEnd - xWithStart) / (xData.size - 1)
} else {
sleepsData?.let {
xSpacing = (xWithEnd - xWithStart) / it.total //时间段分割成分钟
}
}
postInvalidate()
return this
}
private fun drawGradientLine(canvas: Canvas) {
if (sleepsData == null) {
canvas.drawText(
context.getString(R.string.no_sleep_data),
scrWidth / 2f,
scrHeight / 2f,
paintXText
)
} else {
val mLinearGradient = LinearGradient(
xSlider, ySpacing, xSlider, ySpacing * 6,
intArrayOf(
context.colorCompat(R.color.ffffff_262626), Color.parseColor("#0e83ff"),
context.colorCompat(R.color.ffffff_262626)
), null, Shader.TileMode.MIRROR
)
paintGradientLine.shader = mLinearGradient
if (ySpacing > 0) {
canvas.drawLine(xSlider, ySpacing, xSlider, ySpacing * 6, paintGradientLine)
}
}
}
private var onDaySelectListener: ((index: Int, item: SleepItem) -> Unit)? = null
fun setOnDaySelectListener(l: ((index: Int, item: SleepItem) -> Unit)): SleepDayChart {
this.onDaySelectListener = l
return this
}
}看完上述内容，你们掌握怎么在Android中自定义一个控件的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注亿速云行业资讯频道，感谢各位的阅读！
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