概述
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：
<declare-styleable name="ScanView" tools:ignore="ResourceName"> <!--扫描的图片--> <attr name="unit_scan_img" format="reference" /> <!--动画时长--> <attr name="anim_duration" format="integer" /> </declare-styleable>
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）：
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android:fillType="evenOdd"> <aapt:attr name="android:fillColor"> <gradient android:startY="61" android:startX="55" android:endY="-1.6146E-7" android:endX="55" android:type="linear"> <item android:offset="0" android:color="#721984FF"/> <item android:offset="0.476488" android:color="#191984FF"/> <item android:offset="1" android:color="#051984FF"/> </gradient> </aapt:attr> </path> </vector>
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靠谱客。
最后
以上就是辛勤蜻蜓为你收集整理的Android自定义View实现扫描效果的全部内容，希望文章能够帮你解决Android自定义View实现扫描效果所遇到的程序开发问题。
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