kotlin 拍照加水印

您可以使用Android中的Camera API来拍摄照片，然后使用Canvas在照片上绘制水印。以下是一个基本示例：

private fun addWatermarkToImage(bitmap: Bitmap, watermarkText: String): Bitmap {
    val w = bitmap.width
    val h = bitmap.height
    val result = Bitmap.createBitmap(w, h, bitmap.config)
    val canvas = Canvas(result)
    canvas.drawBitmap(bitmap, 0f, 0f, null)

    val paint = Paint()
    paint.color = Color.WHITE
    paint.textSize = 36f
    paint.isAntiAlias = true
    paint.isFakeBoldText = true

    val bounds = Rect()
    paint.getTextBounds(watermarkText, 0, watermarkText.length, bounds)

    val x = w - bounds.width() - 20f
    val y = h - bounds.height() - 20f

    canvas.drawText(watermarkText, x, y, paint)

    return result
}

private fun capturePhoto() {
    val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
    startActivityForResult(intent, REQUEST_IMAGE_CAPTURE)
}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
        val imageBitmap = data?.extras?.get("data") as Bitmap
        val watermarkedBitmap = addWatermarkToImage(imageBitmap, "CSDN")
        // do something with the watermarked bitmap
    }
}