Android自定義View實(shí)現(xiàn)掃描效果
更新時(shí)間：2021年04月06日 14:59:35 作者：OneDeveloper
這篇文章主要為大家詳細(xì)介紹了Android自定義View實(shí)現(xiàn)掃描效果，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下
本文實(shí)例為大家分享了Android自定義View實(shí)現(xiàn)掃描效果的具體代碼，供大家參考，具體內(nèi)容如下
演示效果如下：
實(shí)現(xiàn)內(nèi)容：
1、控制動(dòng)畫(huà)是豎向或者橫向
2、控制動(dòng)畫(huà)初始是從底部/左邊開(kāi)始，或者從上邊/右邊開(kāi)始
3、控制動(dòng)畫(huà)的時(shí)常
4、可以自定義動(dòng)畫(huà)素材
具體實(shí)現(xiàn)：
自定義屬性：
<declare-styleable name="ScanView" tools:ignore="ResourceName"> <!--掃描的圖片--> <attr name="unit_scan_img" format="reference" /> <!--動(dòng)畫(huà)時(shí)長(zhǎng)--> <attr name="anim_duration" format="integer" /> </declare-styleable>
自定義 View：
實(shí)現(xiàn)原理，就是對(duì) bitmap 做 Translate、preScale 轉(zhuǎn)換，然后不斷的 draw bitmap。其中 Translate 是為了實(shí)現(xiàn)位移效果，preScale 則是為了來(lái)回轉(zhuǎn)換方向。
class ScanView : View {
/**
* 掃描的圖片drawable
*/
private var scanImg: Drawable? = null
private lateinit var paint: Paint
/**
* 控件的寬
*/
private var viewWidth: Int = 0
/**
* 控件的高
*/
private var viewHeight: Int = 0
private var bitmapMatrix = Matrix()
private var scanBitmap: Bitmap? = null
/**
* 掃描圖片需要顯示的高度
*/
private var showBitmapHeight: Float = 0F
/**
* 控制動(dòng)畫(huà)是豎向或者橫向
*/
private var isVertical = true
/**
* 控制動(dòng)畫(huà)初始是從底部/左邊開(kāi)始（true），或者從上邊/右邊開(kāi)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()
}
/**
* 屬性動(dòng)畫(huà)
*/
private var valueAnimator: ValueAnimator? = null
/**
* 動(dòng)畫(huà)時(shí)長(zhǎng)
*/
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
}
// 處理橫置的時(shí)候圖片的旋轉(zhuǎn)（因?yàn)橐曈X(jué)給的圖一般是一個(gè)豎向的圖，因此在橫置的時(shí)候，手動(dòng)將圖片同步橫置）
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()
// 為了解決適配問(wèn)題，因?yàn)椴煌謾C(jī)寬度不同，如果 UI 只提供了一個(gè)尺寸的素材，則可能會(huì)出現(xiàn)拉伸
// 導(dǎo)致視覺(jué)效果不好的問(wèn)題。這里換一種解決思路，即不將圖片進(jìn)行縮放，而是根據(jù)時(shí)機(jī)的寬度，
// 去重復(fù)拼湊 unitImgBitmap，使其轉(zhuǎn)換為一個(gè)充滿(mǎn)寬度的整圖，從而避免縮放導(dǎo)致的拉伸問(wèn)題。
// 需要注意的是，此時(shí)需要跟視覺(jué)協(xié)商，只需要給最小單元的圖片素材即可。
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)
}
}
/**
* 開(kāi)始做屬性動(dòng)畫(huà)
*/
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 {
// 使得掃描動(dòng)畫(huà)在橫豎狀態(tài)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 動(dòng)畫(huà)來(lái)回時(shí)的方向
isPositive = !isPositive
}
})
start()
}
}
// 通過(guò)直接返回對(duì)應(yīng)的 ValueAnimator.AnimatorUpdateListener，
// 而不是在 ValueAnimator.AnimatorUpdateListener 回調(diào)中做 if 判斷，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 來(lái)回動(dòng)畫(huà)的時(shí)候，方向是相對(duì)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 來(lái)回動(dòng)畫(huà)的時(shí)候，方向是相對(duì)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()
}
}
}
}
/**
* 停止屬性動(dòng)畫(huà)
*/
fun stopScanAnimAndReset() {
valueAnimator?.takeIf { it.isRunning }?.cancel()
reset(true)
}
/**
* 重置為初始狀態(tài)
*/
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，上述代碼的實(shí)現(xiàn)，有一個(gè)暫時(shí)還沒(méi)有思路解決的問(wèn)題，即比如動(dòng)畫(huà)從上掃描到底部，然后轉(zhuǎn)換方向再?gòu)牡撞客系臅r(shí)候，這里其實(shí)是有一段時(shí)間間隔的，并不是會(huì)馬上從底部露出來(lái)。 只不過(guò)如果設(shè)置的動(dòng)畫(huà)時(shí)間比較短的話，感官上不會(huì)那么明顯。
另外，上述代碼中用到了系統(tǒng)提供的擴(kuò)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
}
最后附帶本身使用的動(dòng)畫(huà)圖片素材（是一張矢量圖）：
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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>
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