超级简单的Android控件View转图片Bitmap_view needs to be laid out before calling drawtobit

直接上代码：

fun getBitmapFromView(view: View): Bitmap {
        val bitmap = Bitmap.createBitmap(
            view.width, view.height,
            Bitmap.Config.ARGB_8888
        )
        val canvas = Canvas(bitmap)
        view.layout(0, 0, view.width, view.height)
        Log.d("ss", "combineImages: width: " + view.width)
        Log.d("ss", "combineImages: height: " + view.height)
        view.draw(canvas)
        view.requestLayout()
        return bitmap
    }

今天看了一下kotlin的源码，发现我根本就是多余的，哈哈，人家本来就已经有这种方法了，直接用就可以了

/**
 * Return a [Bitmap] representation of this [View].
 *
 * The resulting bitmap will be the same width and height as this view's current layout
 * dimensions. This does not take into account any transformations such as scale or translation.
 *
 * Note, this will use the software rendering pipeline to draw the view to the bitmap. This may
 * result with different drawing to what is rendered on a hardware accelerated canvas (such as
 * the device screen).
 *
 * If this view has not been laid out this method will throw a [IllegalStateException].
 *
 * @param config Bitmap config of the desired bitmap. Defaults to [Bitmap.Config.ARGB_8888].
 */
fun View.drawToBitmap(config: Bitmap.Config = Bitmap.Config.ARGB_8888): Bitmap {
    if (!ViewCompat.isLaidOut(this)) {
        throw IllegalStateException("View needs to be laid out before calling drawToBitmap()")
    }
    return Bitmap.createBitmap(width, height, config).applyCanvas {
        translate(-scrollX.toFloat(), -scrollY.toFloat())
        draw(this)
    }
}

直接引用就可以

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_test)
 
        //textView.setpadding(10)
 
        textView.drawToBitmap(Bitmap.Config.ARGB_8888)
 
    }