需要将布局转换成Bitmap有两种情况
一种情况是布局已经展示出来
参考文章：
https://www.jianshu.com/p/b9f28463ab9c
如果布局没有展示出来：
如果控件没有在屏幕上显示的而要获取bitmap，如果运行起来会报错
java.lang.IllegalArgumentException: width and height must be > 0
需要对view进行实际的测量，和摆放
targetView.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED))
targetView.layout(0, 0, targetView.measuredWidth, targetView.measuredHeight)
如果图片超出一屏
https://blog.csdn.net/qq_36347817/article/details/85985603
源码：
class BitmapUtls {
companionobject {
/**
* 将一个未show的布局转换成bitmap
*/
fun createUnShowBitmapFromLayout(v: View):Bitmap {
v.measure(View.MeasureSpec.makeMeasureSpec(360.dp2px().toInt(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED))
v.layout(0, 0, v.measuredWidth, v.measuredHeight)
val bitmap = Bitmap.createBitmap(v.getWidth(), v.getHeight(), Bitmap.Config.ARGB_8888)
v.draw(Canvas(bitmap))
return bitmap
}
/**
* 通过一个已show的布局创建bitmap
*/
fun createShowedBitmap(window: Window, targetView: View, getCacheResult: (bitmap: Bitmap) -> Unit) {
targetView.measure(View.MeasureSpec.makeMeasureSpec(360.dp2px().toInt(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED))
targetView.layout(0, 0, targetView.measuredWidth, targetView.measuredHeight)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//准备一个bitmap对 象，用来将copy出来的区域绘制到此对象中
val bitmap = Bitmap.createBitmap(targetView.getWidth(), targetView.getHeight(), Bitmap.Config.ARGB_8888)
//获取layout的left-top顶点位置
val location = IntArray(2)
targetView.getLocationInWindow(location)
//请求转换
PixelCopy.request(window,
Rect(location[0], location[1],
location[0] + targetView.getWidth(), location[1] + targetView.getHeight()),
bitmap, OnPixelCopyFinishedListener { copyResult ->
//如果成功
if (copyResult == PixelCopy.SUCCESS) {//方法回调
getCacheResult.invoke(bitmap)
}
}, Handler(Looper.getMainLooper()))
}else {//开启DrawingCache
targetView.setDrawingCacheEnabled(true)
//构建开启DrawingCache
targetView.buildDrawingCache()
//获取Bitmap
val drawingCache: Bitmap = targetView.getDrawingCache()
//方法回调
getCacheResult.invoke(drawingCache)
//销毁DrawingCache
targetView.destroyDrawingCache()
}
}
}
}
