android - 如何将 bytearray 与 kotlin 中的 file.length() 进行比较？

Question

1. 我只需要发送小于 2 MB 的文件。我使用文件和位图。项目中使用了easyimage库。

2. 当我除以 1024 时，如何比较以 kb 为单位返回的常规 imagefile.length()。但是位图图像返回字节 bitmap.bytecount

3. 如何获取kb位图文件的值？它循环直到它完全压缩到 0 质量。

代码: var 质量 = 90

var imgKiloByteLength = imageFile.length() / 1024
var imgMegaByteLength = imgKiloByteLength / 1024  //returns in mb

if (imgKiloByteLength > 2048) {
   while (imgKiloByteLength > 2048) {  //reducing the quality until it comes under 2mb
     var compressedBitmap = compressBitmap(bitmap, quality)
     bitmap = compressedBitmap
     Log.e("result",bitmap.getByteCount().toString())
     Glide.with(this@EditProfileActivity).load(bitmap).into(profileImage)
     Log.e("result", "image more than 2mb ${imgKiloByteLength}")
     quality -= 10
   }
} else {
   Glide.with(this@EditProfileActivity).load(bitmap).into(profileImage)
   Log.e("result", "image size ok ${imgKiloByteLength}")
}

我可以做什么？提前致谢。

Answer 1

此代码可以帮助您将位图文件压缩到最大大小

object BitmapUtils {
    const val ONE_KIO = 1024
    const val ONE_MIO = ONE_KIO * ONE_KIO

    /**
     * Compress, if needed, an image file to be lower than or equal to 1 Mio
     *
     * @param filePath Image file path
     *
     * @return Stream containing data of the compressed image. Can be null
     */
    fun compressedImageFile(filePath: String): InputStream? {
        var quality = 100
        var inputStream: InputStream? = null
        if (filePath.isNotEmpty()) {
            var bufferSize = Integer.MAX_VALUE
            val byteArrayOutputStream = ByteArrayOutputStream()
            try {
                val bitmap = BitmapFactory.decodeFile(filePath)
                do {
                    if (bitmap != null) {
                        byteArrayOutputStream.reset()
                        bitmap.compress(Bitmap.CompressFormat.JPEG, quality, byteArrayOutputStream)
                        bufferSize = byteArrayOutputStream.size()
                        logD { "quality: $quality -> length: $bufferSize" }
                        quality -= 10
                    }
                } while (bufferSize > ONE_MIO)
                inputStream = ByteArrayInputStream(byteArrayOutputStream.toByteArray())
                byteArrayOutputStream.close()
            } catch (e: Exception) {
                logE { "Exception when compressing file image: ${e.message}" }
            }
        }
        return inputStream
    }
}

不关心logX方法，它们是我方便的日志方法