原标题：Glide加载圆角图片的方法
现在在市面上很多App的UI设计都会出现圆角图片的显示。Glide本身也提供了圆角图片的加载方式。但是我们在开发中有可能遇到只要顶部展示圆角，或者某一个角是圆角。这样的需求是该怎么实现呢？
Glide有对外暴露一个方法，可以在图片显示前，对图片作转换处理——就是Transformations。有关此方面的文字，小可爱们可以看看这篇——Glide - 自定义转换。本文的RoundCorner就是继承了BitmapTransformation类来实现的。它对外提供两个构造函数，一个构造函数有四个参数，分别是leftTop:左上角、rightTop:右上角、leftBottom:左下角、rightBottom：右下角。
1、普通的四个角为圆角图片:Glide.with( this).load( "/vertical/0/07_22_36_afe651da2ab940d0e257a1ec894bd992_1504795010150.jpg/420")
.apply(RequestOptions.bitmapTransform(RoundedCorners( 20)))
. into(iv)
实现的效果如下:
2、实现部分的圆角importandroid.content.Context
importandroid.graphics.*
importcom.bumptech.glide.load.Key
importcom.bumptech.glide.load.engine.bitmap_recycle.BitmapPool
importcom.bumptech.glide.load.resource.bitmap.BitmapTransformation
importjava.security.MessageDigest
classRoundCornerconstructor(context: Context,leftTop: Float= 0f,
rightTop: Float= 0f,
rightBottom: Float= 0f,
leftBottom: Float= 0f) : BitmapTransformation() {
privatevalID: String = "com.jadynai.kotlindiary.RoundCorner$leftTop$rightTop$leftBottom$rightBottom"
privatevalleftTop: Float= dip2px(context,leftTop).toFloat()
privatevalrightTop =dip2px(context,rightTop).toFloat()
privatevalleftBottom = dip2px(context,leftBottom).toFloat()
privatevalrightBottom = dip2px(context,rightBottom).toFloat()
privatevalID_BYTES: ByteArray
//dp转px
fundip2px(var0: Context, var1: Float): Int{
valvar2 = var0.resources.displayMetrics.density
return(var1 * var2 + 0.5f).toInt()
}
init {
ID_BYTES = ID.toByteArray(Key.CHARSET)
}
overridefuntransform(
pool: BitmapPool, toTransform: Bitmap, outWidth: Int, outHeight: Int): Bitmap {
valwidth = toTransform.width
valheight = toTransform.height
valbitmap = pool. get(width, height, Bitmap.Config.ARGB_8888)
bitmap.setHasAlpha( true)
valcanvas = Canvas(bitmap)
valpaint = Paint()
paint.isAntiAlias = true
paint.shader = BitmapShader(toTransform, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)
valrect = RectF( 0f, 0f, width.toFloat(), height.toFloat())
valradii = floatArrayOf(leftTop, leftTop, rightTop, rightTop, rightBottom, rightBottom, leftBottom, leftBottom)
valpath = Path()
path.addRoundRect(rect, radii, Path.Direction.CW)
canvas.drawPath(path, paint)
returnbitmap
}
overridefunequals(other: Any?): Boolean{
if(other isRoundCorner) {
returnleftTop == other?.leftTop && rightTop == other?.rightTop && leftBottom == other?.leftBottom && rightBottom == other?.rightBottom
}
returnfalse
}
overridefunhashCode(): Int{
returnID.hashCode() + leftTop.hashCode() + rightTop.hashCode() + leftBottom.hashCode() + rightBottom.hashCode()
}
overridefunupdateDiskCacheKey(messageDigest: MessageDigest){
messageDigest.update(ID_BYTES)
}
}
Glide.with( this).load( "/vertical/0/07_22_36_afe651da2ab940d0e257a1ec894bd992_1504795010150.jpg/420")
.apply(RequestOptions.bitmapTransform(RoundCorner( this,leftTop = 20f, rightBottom = 20f)))
.into(iv) //实现左上角和右下角圆角
实现的效果:
3、实现一个角是圆角Glide.with( this).load( "/vertical/0/07_22_36_afe651da2ab940d0e257a1ec894bd992_1504795010150.jpg/420")
.apply(RequestOptions.bitmapTransform(RoundCorner( this,rightTop = 20f)))
.into(iv) //右上角
实现效果:
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