Question

我正在使用必须在运行时将“图像颜色”更改为“渐变”的Android应用程序。我已经实现了在运行时更改单个图像上的两种不同颜色的功能，但是我面临的问题是它只更改了固定值（如固定颜色）这样的静态值，我已经添加了

 for (x in 0 until width) {
            for (y in 0 until height) {
                if (bitMatrix.get(x, y)) {
                    val red = (56 - (56.0 - 14.0) / height * (y + 1)).toInt()
                    val green = (247 - (247.0 - 145.0) / height * (y + 1)).toInt()
                    val blue = (195 - (195.0 - 79.0) / height * (y + 1)).toInt()
                    val colorInt = argb(255, red, green, blue)
                    // Modify the color of the QR code, you can separately develop the color of the QR code and background
                    pixels[x * height + y] = if (bitMatrix.get(x, y)) colorInt else 16777215// 0x000000:0xffffff
                } else {
                    pixels[x * height + y] = 0x00ffffff// background color
                }
            }

我想要的是它通过我添加的搜索栏上的RGB渐变来更改颜色这就是我更改单个图像的两种颜色的方式：

使用1个函数创建渐变的代码，它是在创建渐变，但是是静态创建的，但是当我尝试在搜索栏上使用渐变功能时，它不起作用，并且只能用单色更改渐变

现在的代码

    fun createQRGradientImage(url: String?, width: Int, height: Int): Bitmap? {
    try {
        if (url == null || "" == url || url.length < 1) {
            return null
        }
        val hints: Hashtable<Any?, Any?> = Hashtable<Any?, Any?>()
        hints[EncodeHintType.CHARACTER_SET] = "utf-8"
        hints[EncodeHintType.MARGIN] = 0
        // Image data conversion, using matrix conversion
        val bitMatrix = QRCodeWriter().encode(url, BarcodeFormat.QR_CODE, width, height)
        val width = bitMatrix.width
        val height = bitMatrix.height
        val pixels = IntArray(width * height)

        // Gradient color draw from top to bottom
        for (y in 0 until height) {
            for (x in 0 until width) {

                if (bitMatrix[x, y]) { // QR code color

                    
                    val red = (56 - (56.0 - 14.0) / height * (y + 1)).toInt()
                    val green = (247 - (247.0 - 145.0) / height * (y + 1)).toInt()
                    val blue = (195 - (195.0 - 79.0) / height * (y + 1)).toInt()
                    val color = Color()
                    val colorInt = Color.argb(255, red, green, blue)

                    // Modify the color of the QR code, you can separately develop the color of the QR code and background
                    pixels[y * width + x] =
                        if (bitMatrix[x, y]) colorInt else 16777215 // 0x000000:0xffffff
                } else {
                    pixels[y * width + x] = 0x00ffffff // background color
                }
            }
        }

        // Generate the format of the QR code image, using ARGB_8888
        val bitmap = Bitmap.createBitmap(
            width, height,
            Bitmap.Config.ARGB_8888
        )
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height)

        return bitmap
   //     img_bitmap1.setImageBitmap(bitmap)
    } catch (e: WriterException) {
        e.printStackTrace()
    }
    return null
}

但是此代码在调试级别给出了此信息

以上是此代码获得的图像

 if (bitMatrix[x, y]) { // QR code color


                    val red = (56 - (56.0 - 14.0) / height * (y + 1)).toInt()
                    val green = (247 - (247.0 - 145.0) / height * (y + 1)).toInt()
                    val blue = (195 - (195.0 - 79.0) / height * (y + 1)).toInt()
                    val color = Color()
                    val colorInt = Color.argb(255, red, green, blue)

                    // Modify the color of the QR code, you can separately develop the color of the QR code and background
                    pixels[y * width + x] =
                        if (bitMatrix[x, y]) colorInt else 16777215 // 0x000000:0xffffff
                } else {
                    pixels[y * width + x] = 0x00ffffff // background color
                }

我想要的是上面的代码应在我创建的搜索栏类颜色上起作用就像在搜索栏中一样，我有方法

    fun pickColor(position: Float, canvasWidth: Int): Int {
    val value = (position - paddingStart) / (canvasWidth - (paddingStart + paddingEnd))
    when {
        value <= 0.0 -> return colorSeeds[0]
        value >= 1 -> return colorSeeds[colorSeeds.size - 1]
        else -> {
            var colorPosition = value * (colorSeeds.size - 1)
            val i = colorPosition.toInt()
            colorPosition -= i
            val c0 = colorSeeds[i]
            val c1 = colorSeeds[i + 1]

            val red = mix((56 - (56.0 - 14.0) / height * (y + 1)).toInt(),Color.red(c1), colorPosition)
            val green = mix((247 - (247.0 - 145.0) / height * (y + 1)).toInt(), Color.green(c1), colorPosition)
            val blue = mix((195 - (195.0 - 79.0) / height * (y + 1)).toInt(), Color.blue(c1), colorPosition)
          //  return Color.rgb( red, green, blue)
            return Color.argb(255, red, green, blue)
        }
    }
}

在颜色搜索栏上创建渐变

0 个答案: