本文实例为大家分享了Android自定义View实现扫描效果的具体代码,供大家参考,具体内容如下

演示效果如下:

实现内容:

1、控制动画是竖向或者横向

2、控制动画初始是从底部/左边开始,或者从上边/右边开始

3、控制动画的时常

4、可以自定义动画素材

具体实现:

自定义属性:

自定义 View:

实现原理,就是对 bitmap 做 Translate、preScale 转换,然后不断的 draw bitmap。其中 Translate 是为了实现位移效果,preScale 则是为了来回转换方向。

class ScanView : View {

/**

* 扫描的图片drawable

*/

private var scanImg: Drawable? = null

private lateinit var paint: Paint

/**

* 控件的宽

*/

private var viewWidth: Int = 0

/**

* 控件的高

*/

private var viewHeight: Int = 0

private var bitmapMatrix = Matrix()

private var scanBitmap: Bitmap? = null

/**

* 扫描图片需要显示的高度

*/

private var showBitmapHeight: Float = 0F

/**

* 控制动画是竖向或者横向

*/

private var isVertical = true

/**

* 控制动画初始是从底部/左边开始(true),或者从上边/右边开始(false)

*/

private var isStartFromBottom = true

private var isPositive = true

fun setVertical(isVertical: Boolean) {

this.isVertical = isVertical

stopScanAnimAndReset()

setScanBitmap()

}

fun setStartFromBootom(isFromBottom: Boolean) {

this.isStartFromBottom = isFromBottom

stopScanAnimAndReset()

}

/**

* 属性动画

*/

private var valueAnimator: ValueAnimator? = null

/**

* 动画时长

*/

private var animDuration: Long = 1000L

constructor(context: Context) : this(context, null)

constructor(context: Context, attrs: AttributeSet?) : this(context, attrs, 0)

constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr) {

initAttribute(context, attrs)

init()

}

private fun initAttribute(context: Context, attrs: AttributeSet?) {

attrs?.let {

val typedArray = context.obtainStyledAttributes(attrs, R.styleable.ScanView)

scanImg = typedArray.getDrawable(R.styleable.ScanView_unit_scan_img)

animDuration = typedArray.getInt(R.styleable.ScanView_anim_duration, 1000).toLong()

typedArray.recycle()

}

}

fun setAnimDuration(time: Long) {

animDuration = time

}

private fun init() {

paint = Paint(Paint.ANTI_ALIAS_FLAG)

paint.style = Paint.Style.FILL

}

private fun getBitmapFromDrawable(drawable: Drawable): Bitmap? {

var unitImgBitmap = drawable.toBitmap()

if (unitImgBitmap.isRecycled) {

return null

}

if (unitImgBitmap.isRecycled) {

return null

}

// 处理横置的时候图片的旋转(因为视觉给的图一般是一个竖向的图,因此在横置的时候,手动将图片同步横置)

if (!isVertical) {

val matrix = Matrix()

matrix.postRotate(90f)

val resizedBitmap = Bitmap.createBitmap(unitImgBitmap, 0, 0,

unitImgBitmap.width, unitImgBitmap.height, matrix, true)

if (resizedBitmap != unitImgBitmap && unitImgBitmap != null && !unitImgBitmap.isRecycled) {

unitImgBitmap.recycle()

unitImgBitmap = resizedBitmap

}

}

var realWidth: Int

val finalBitmap: Bitmap

val realUnitImgWidth: Float

if (isVertical) {

realWidth = viewWidth

finalBitmap = Bitmap.createBitmap(realWidth, unitImgBitmap.height, Bitmap.Config.ARGB_8888)

realUnitImgWidth = unitImgBitmap.width.toFloat()

} else {

realWidth = viewHeight

finalBitmap = Bitmap.createBitmap(unitImgBitmap.width, realWidth, Bitmap.Config.ARGB_8888)

realUnitImgWidth = unitImgBitmap.height.toFloat()

}

val canvas = Canvas(finalBitmap)

// 向上取整

val count = ceil(realWidth / realUnitImgWidth).toInt()

// 为了解决适配问题,因为不同手机宽度不同,如果 UI 只提供了一个尺寸的素材,则可能会出现拉伸

// 导致视觉效果不好的问题。这里换一种解决思路,即不将图片进行缩放,而是根据时机的宽度,

// 去重复拼凑 unitImgBitmap,使其转换为一个充满宽度的整图,从而避免缩放导致的拉伸问题。

// 需要注意的是,此时需要跟视觉协商,只需要给最小单元的图片素材即可。

if (isVertical) {

for (i in 0 until count) {

canvas.drawBitmap(unitImgBitmap,i * realUnitImgWidth, 0f, paint)

}

} else {

for (i in 0 until count) {

canvas.drawBitmap(unitImgBitmap,0f, i * realUnitImgWidth, paint)

}

}

return finalBitmap

}

override fun onDraw(canvas: Canvas) {

super.onDraw(canvas)

scanBitmap?.let {

canvas.drawBitmap(it, bitmapMatrix, paint)

}

}

/**

* 开始做属性动画

*/

fun startScanAnim() {

valueAnimator?.takeIf { it.isRunning }?.let { it.cancel() }

val value = if(isVertical) viewHeight.toFloat() else viewWidth.toFloat()

valueAnimator = if (isStartFromBottom) {

ValueAnimator.ofFloat(value + showBitmapHeight, -showBitmapHeight)

} else {

ValueAnimator.ofFloat(-showBitmapHeight, value + showBitmapHeight)

}

valueAnimator?.apply {

// 使得扫描动画在横竖状态下都是相同的速度

duration = if (isVertical) animDuration else (animDuration * 1.0f / viewWidth * viewHeight).toLong()

repeatCount = -1

repeatMode = ValueAnimator.REVERSE

addUpdateListener(getUpdateListener())

addListener(object : AnimatorListenerAdapter() {

override fun onAnimationRepeat(animation: Animator) {

// 用于控制 scan img 动画来回时的方向

isPositive = !isPositive

}

})

start()

}

}

// 通过直接返回对应的 ValueAnimator.AnimatorUpdateListener,

// 而不是在 ValueAnimator.AnimatorUpdateListener 回调中做 if 判断,提高性能

private fun getUpdateListener(): ValueAnimator.AnimatorUpdateListener {

return if (isVertical) {

if (isStartFromBottom) {

ValueAnimator.AnimatorUpdateListener { animation ->

val value = animation.animatedValue as? Float ?: return@AnimatorUpdateListener

bitmapMatrix.setTranslate(0F, value)

// 使得 bitmap 来回动画的时候,方向是相对的

bitmapMatrix.preScale(1.0f, if (isPositive) -1.0f else 1.0f)

invalidate()

}

} else {

ValueAnimator.AnimatorUpdateListener { animation ->

val value = animation.animatedValue as? Float ?: return@AnimatorUpdateListener

bitmapMatrix.setTranslate(0F, value)

// 使得 bitmap 来回动画的时候,方向是相对的

bitmapMatrix.preScale(1.0f, if (isPositive) 1.0f else -1.0f)

invalidate()

}

}

} else {

if (isStartFromBottom) {

ValueAnimator.AnimatorUpdateListener { animation ->

val value = animation.animatedValue as? Float ?: return@AnimatorUpdateListener

bitmapMatrix.setTranslate(value, 0f)

bitmapMatrix.preScale(if (isPositive) 1.0f else -1.0f, 1.0f)

invalidate()

}

} else {

ValueAnimator.AnimatorUpdateListener { animation ->

val value = animation.animatedValue as? Float ?: return@AnimatorUpdateListener

bitmapMatrix.setTranslate(value, 0f)

bitmapMatrix.preScale(if (isPositive) -1.0f else 1.0f, 1.0f)

invalidate()

}

}

}

}

/**

* 停止属性动画

*/

fun stopScanAnimAndReset() {

valueAnimator?.takeIf { it.isRunning }?.cancel()

reset(true)

}

/**

* 重置为初始状态

*/

private fun reset(isInvalidate: Boolean) {

bitmapMatrix.reset()

isPositive = true

if (isVertical) {

if (isStartFromBottom) {

bitmapMatrix.setTranslate(0F, viewHeight + showBitmapHeight)

bitmapMatrix.preScale(1.0f, if (isPositive) -1.0f else 1.0f)

} else {

bitmapMatrix.setTranslate(0F, -showBitmapHeight)

bitmapMatrix.preScale(1.0f, if (isPositive) 1.0f else -1.0f)

}

} else {

if (isStartFromBottom) {

bitmapMatrix.setTranslate(viewWidth + showBitmapHeight, 0f)

bitmapMatrix.preScale(if (isPositive) 1.0f else -1.0f, 1.0f)

} else {

bitmapMatrix.setTranslate(-showBitmapHeight, 0f)

bitmapMatrix.preScale(if (isPositive) -1.0f else 1.0f, 1.0f)

}

}

if (isInvalidate) {

invalidate()

}

}

private fun setScanBitmap() {

if (scanImg == null || viewWidth <= 0 || viewHeight <= 0) {

return

}

val bitmap = getBitmapFromDrawable(scanImg!!) ?: return

scanBitmap = bitmap

showBitmapHeight = if (isVertical) bitmap.height.toFloat() else bitmap.width.toFloat()

reset(false)

}

override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {

super.onSizeChanged(w, h, oldw, oldh)

viewWidth = w

viewHeight = h

setScanBitmap()

}

override fun onDetachedFromWindow() {

super.onDetachedFromWindow()

stopScanAnimAndReset()

}

}

需要注意,上述代码的实现,有一个暂时还没有思路解决的问题,即比如动画从上扫描到底部,然后转换方向再从底部往上的时候,这里其实是有一段时间间隔的,并不是会马上从底部露出来。 只不过如果设置的动画时间比较短的话,感官上不会那么明显。

另外,上述代码中用到了系统提供的扩展方法 Drawable.toBitmap()。

// androidx.core:core-ktx:1.3.2

fun Drawable.toBitmap(

@Px width: Int = intrinsicWidth,

@Px height: Int = intrinsicHeight,

config: Config? = null

): Bitmap {

if (this is BitmapDrawable) {

if (config == null || bitmap.config == config) {

// Fast-path to return original. Bitmap.createScaledBitmap will do this check, but it

// involves allocation and two jumps into native code so we perform the check ourselves.

if (width == intrinsicWidth && height == intrinsicHeight) {

return bitmap

}

return Bitmap.createScaledBitmap(bitmap, width, height, true)

}

}

val (oldLeft, oldTop, oldRight, oldBottom) = bounds

val bitmap = Bitmap.createBitmap(width, height, config ?: Config.ARGB_8888)

setBounds(0, 0, width, height)

draw(Canvas(bitmap))

setBounds(oldLeft, oldTop, oldRight, oldBottom)

return bitmap

}

最后附带本身使用的动画图片素材(是一张矢量图):

xmlns:aapt="http://schemas.android.com/aapt"

android:width="108dp"

android:height="61dp"

android:viewportWidth="108"

android:viewportHeight="61">

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90V16H88ZM90,19H88V21H90V19ZM90,22H88V24H90V22ZM90,25H88V27H90V25ZM90,28H88V30H90V28ZM90,31H88V33H90V31ZM90,34H88V36H90V34ZM87,36V34H85V36H87ZM84,36V34H82V36H84ZM81,36V34L79,34V36L81,36ZM78,36V34H76V36H78ZM75,36V34H73V36H75ZM72,36V34H70V36H72ZM69,36V34H67V36H69ZM66,36V34H64V36H66ZM63,36V34H61V36H63ZM60,36V34H58V36H60ZM57,36V34H55V36H57ZM54,36V34H52V36H54ZM51,36V34H49V36H51ZM48,36V34H46V36H48ZM45,36V34H43V36H45ZM42,36V34H40V36H42ZM39,36V34H37V36H39ZM36,36V34H34V36H36ZM33,36V34H31V36H33ZM30,36V34H28V36H30ZM27,36V34H25V36H27ZM24,36V34H22V36H24ZM21,36V34H19V36H21ZM18,36V34H16V36H18ZM16,33H18V31H16V33ZM16,30H18V28H16V30ZM16,27H18V25H16V27ZM16,24H18V22H16V24ZM16,21H18V19H16V21ZM19,19V21H21V19H19ZM22,19V21H24V19H22ZM25,19V21H27V19H25ZM28,19V21H30V19H28ZM31,19V21L33,21V19L31,19ZM34,19V21H36V19H34ZM37,19V21H39V19H37ZM40,19V21H42V19H40ZM43,19V21H45V19H43ZM46,19V21H48V19H46ZM49,19V21H51V19H49ZM52,19V21H54V19L52,19ZM55,19V21H57V19H55ZM58,19V21H60V19H58ZM61,19V21H63V19H61ZM64,19V21H66V19H64ZM67,19V21H69V19H67ZM70,19V21H72V19H70ZM73,19V21H75V19H73ZM76,19V21H78V19H76ZM79,19V21H81V19H79ZM82,19V21H84V19H82ZM85,19V21H87V19H85ZM87,22H85V24H87V22ZM87,25H85V27H87V25ZM87,28H85V30H87V28ZM87,31H85V33H87V31ZM84,33V31H82V33H84ZM81,33V31H79V33L81,33ZM78,33V31H76V33H78ZM75,33V31H73V33H75ZM72,33V31H70V33H72ZM69,33V31H67V33H69ZM66,33V31H64V33H66ZM63,33V31H61V33H63ZM60,33V31H58V33H60ZM57,33V31H55V33H57ZM54,33V31H52V33H54ZM51,33V31H49V33H51ZM48,33V31H46V33H48ZM45,33V31H43V33H45ZM42,33V31H40V33H42ZM39,33V31H37V33H39ZM36,33V31H34V33H36ZM33,33V31L31,31V33H33ZM30,33V31H28V33H30ZM27,33V31H25V33H27ZM24,33V31H22V33H24ZM21,33V31H19V33H21ZM19,30H21V28H19V30ZM19,27H21V25H19V27ZM19,24H21V22H19V24ZM22,22V24H24V22H22ZM25,22V24H27V22H25ZM28,22V24H30V22H28ZM31,22V24L33,24V22L31,22ZM34,22V24H36V22H34ZM37,22V24H39V22H37ZM40,22V24H42V22H40ZM43,22V24H45V22H43ZM46,22V24H48V22H46ZM49,22V24H51V22H49ZM52,22V24H54V22L52,22ZM55,22V24H57V22H55ZM58,22V24H60V22H58ZM61,22V24H63V22H61ZM64,22V24H66V22H64ZM67,22V24H69V22H67ZM70,22V24H72V22H70ZM73,22V24H75V22H73ZM76,22V24H78V22H76ZM79,22V24H81V22H79ZM82,22V24H84V22H82ZM84,25H82V27H84V25ZM84,28H82V30H84V28ZM81,30V28H79V30H81ZM78,30V28H76V30H78ZM75,30V28H73V30H75ZM72,30V28H70V30H72ZM69,30V28H67V30H69ZM66,30V28H64V30H66ZM63,30V28H61V30H63ZM60,30V28H58V30H60ZM57,30V28H55V30H57ZM54,30V28H52V30L54,30ZM51,30V28H49V30H51ZM48,30V28H46V30H48ZM45,30V28H43V30H45ZM42,30V28H40V30H42ZM39,30V28H37V30H39ZM36,30V28H34V30H36ZM33,30V28L31,28V30L33,30ZM30,30V28H28V30H30ZM27,30V28H25V30H27ZM24,30V28H22V30H24ZM22,27H24V25H22V27ZM25,25V27H27V25H25ZM28,25V27H30V25H28ZM31,25V27L33,27V25L31,25ZM34,25V27H36V25H34ZM37,25V27H39V25H37ZM40,25V27H42V25H40ZM43,25V27H45V25H43ZM46,25V27H48V25H46ZM49,25V27H51V25H49ZM52,25V27L54,27V25L52,25ZM55,25V27H57V25H55ZM58,25V27H60V25H58ZM61,25V27H63V25H61ZM64,25V27H66V25H64ZM67,25V27H69V25H67ZM70,25V27H72V25H70ZM73,25V27H75V25H73ZM76,25V27H78V25H76ZM79,25V27H81V25H79ZM1,57V55H3V57H1ZM4,57V55H6V57H4ZM7,57V55H9V57H7ZM10,57V55H12V57H10ZM13,57V55H15V57H13ZM16,57V55H18V57H16ZM19,57V55H21V57H19ZM22,57V55H24V57H22ZM25,57V55H27V57H25ZM28,57V55H30V57H28ZM31,57V55H33V57H31ZM34,57V55H36V57H34ZM37,57V55H39V57H37ZM40,57V55H42V57H40ZM43,57V55H45V57H43ZM46,57V55H48V57H46ZM49,57V55H51V57H49ZM52,57V55H54V57H52ZM55,57V55H57V57H55ZM58,57V55H60V57H58ZM61,57V55H63V57H61ZM64,57V55H66V57H64ZM67,57V55H69V57H67ZM70,57V55H72V57H70ZM73,57V55H75V57H73ZM76,57V55H78V57H76ZM79,57V55L81,55V57L79,57ZM82,57V55H84V57H82ZM85,57V55H87V57H85ZM88,57V55H90V57H88ZM91,57V55H93V57H91ZM94,57V55H96V57H94ZM97,57V55H99V57H97ZM100,57V55H102V57H100ZM103,57V55H105V57H103ZM1,58V60H3V58H1ZM4,58V60H6V58H4ZM7,58V60H9V58H7ZM10,58V60H12V58H10ZM13,58V60H15V58H13ZM16,58V60H18V58H16ZM19,58V60H21V58H19ZM22,58V60H24V58H22ZM25,58V60H27V58H25ZM28,58V60H30V58H28ZM31,58V60H33V58H31ZM34,58V60H36V58H34ZM37,58V60H39V58H37ZM40,58V60H42V58H40ZM43,58V60H45V58H43ZM46,58V60H48V58H46ZM49,58V60H51V58H49ZM52,58V60H54V58H52ZM55,58V60H57V58H55ZM58,58V60H60V58H58ZM61,58V60H63V58H61ZM64,58V60H66V58H64ZM67,58V60H69V58H67ZM70,58V60H72V58H70ZM73,58V60H75V58H73ZM76,58V60H78V58H76ZM79,58V60L81,60V58L79,58ZM82,58V60H84V58H82ZM85,58V60H87V58H85ZM88,58V60H90V58H88ZM91,58V60H93V58H91ZM94,58V60H96V58H94ZM97,58V60H99V58H97ZM100,58V60H102V58H100ZM103,58V60H105V58H103Z"

android:fillType="evenOdd">

android:startY="61"

android:startX="55"

android:endY="-1.6146E-7"

android:endX="55"

android:type="linear">

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

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