Android从Drawable资源Id直接生成Bitmap,Kotlin

Kotlin 复制代码

        val t1 = System.currentTimeMillis()
        val bmp = getBmpFromDrawId(this, R.mipmap.ic_launcher_round)
        Log.d("fly", "1 ${bmp?.byteCount} h=${bmp?.height} w=${bmp?.width} cost time=${System.currentTimeMillis() - t1}")

        val t2 = System.currentTimeMillis()
        val scaleBmp = Bitmap.createScaledBitmap(bmp!!, 800, 800, true)
        Log.d("fly", "2 ${scaleBmp.byteCount} h=${scaleBmp.height} w=${scaleBmp.width} cost time=${System.currentTimeMillis() - t2}")

Kotlin 复制代码

    private fun getBmpFromDrawId(context: Context, drawId: Int): Bitmap? {
        val drawable = ContextCompat.getDrawable(context, drawId)
        val bitmap = drawable?.let {
            Bitmap.createBitmap(
                it.intrinsicWidth,
                it.intrinsicHeight,
                Bitmap.Config.ARGB_8888
            )
        }

        val canvas = bitmap?.let { Canvas(it) }
        if (canvas != null) {
            drawable.setBounds(0, 0, canvas.width, canvas.height)
            drawable.draw(canvas)
        }

        return bitmap
    }

Android Drawable转BitmapDrawable再提取Bitmap，Kotlin_android drawable to bitmap-CSDN博客文章浏览阅读864次。*Java代码将Drawable转化为Bitmap */ Bitmap drawableToBitmap(Drawable drawable) { int width = drawable.getIntrinsicWidth();Android传递Bitmap的两种简单方式及其缺陷_android上传bitmap_zhangphil的博客-CSDN博客。_android drawable to bitmaphttps://blog.csdn.net/zhangphil/article/details/132351440

Android Drawable 转化成 Bitmap_android drawable 转为 bitmap-CSDN博客文章浏览阅读2k次。/*Java代码将Drawable转化为Bitmap */ Bitmap drawableToBitmap(Drawable drawable) { int width = drawable.getIntrinsicWidth(); int height = drawable.getIntrinsicHeight(); Bitmap bitmap_android drawable 转为 bitmaphttps://blog.csdn.net/zhangphil/article/details/43767535