Android自定义View实现扫描效果
程序员文章站
2022-03-23 09:53:30
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...
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>
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