• kotlin图片合成和压缩


    kotlin图片合成和压缩

    之前的方法是继承AsyncTask 在doInBackground 里面去做压缩的操作,然后用 publishProgress 切到主线程里面更新
    新方法是在协程里的去做

    class ImageService {
            private fun getSumWidths(bitmaps: ArrayList<Bitmap>): Int {
                var sumWidth = 0
                for (b in bitmaps) {
                    sumWidth = intValidCheck((sumWidth + b.width).toLong())
                }
                return sumWidth
            }
    
            private fun getMaxHeights(bitmaps: ArrayList<Bitmap>): Int {
                var max = bitmaps[0].height
                for (bitmap in bitmaps) {
                    if (max < bitmap.height) {
                        max = bitmap.height
                    }
                }
                return max
            }
    
            /**
             * crop front rear left right View Image
             */
            fun cropImage(src: Bitmap): Bitmap {
                Log.d("cropImage src width: " + src.width + ", height: " + src.height)
                //int x, int y, int width, int height
                val result =
                    Bitmap.createBitmap(src, 0, 0, CROP_IMAGE_WIDTH_SIZE, CROP_IMAGE_HEIGHT_SIZE)
                Log.d("cropImage result width: " + result.width + ", height: " + result.height)
                if (result != src) {
                    src.recycle()
                }
                return result
            }
    
            fun cropOtherViewImage(src: Bitmap): Bitmap? {
                Log.d("cropTopViewImage width: " + src.width + ", height: " + src.height)
                //int x, int y, int width, int height
                val result = Bitmap.createBitmap(
                    src,
                    CROP_OTHER_VIEW_IMAGE_X_POINT,
                    0,
                    CROP_OTHER_VIEW_IMAGE_WIDTH_SIZE,
                    CROP_OTHER_VIEW_IMAGE_HEIGHT_SIZE
                )
                Log.d("cropTopViewImage result width: " + result.width + ", height: " + result.height)
                if (result != src) {
                    src.recycle()
                }
                return result
            }
    
            fun mergeMultipleImages(bitmaps: ArrayList<Bitmap>): Bitmap? {
                Log.d("mergeMultipleImages")
                if (bitmaps.isEmpty()){
                    return null
                }
                var totalWidth = 0
                var maxHeight = 0
                for (bitmap in bitmaps) {
                    totalWidth += bitmap.width
                    if (bitmap.height > maxHeight) {
                        maxHeight = bitmap.height
                    }
                }
                val mergedBitmap = Bitmap.createBitmap(
                    getSumWidths(bitmaps),
                    getMaxHeights(bitmaps),
                    Bitmap.Config.ARGB_8888
                )
                val canvas = Canvas(mergedBitmap)
                val paint = Paint()
                /*val mTextPaint = Paint()
                mTextPaint.color = Color.WHITE
                mTextPaint.isAntiAlias = true*/
                var currentX = 0
                for (i in bitmaps.indices) {
                    val bitmap = bitmaps[i]
                    Log.d("bitmaps.get( " + i + " ) result width: " + bitmap.width + ", height: " + bitmap.height)
                    val srcRect = Rect(0, 0, bitmap.width, bitmap.height)
                    val dstRect = Rect(currentX, 0, currentX + bitmap.width, maxHeight)
                    canvas.drawBitmap(bitmap, srcRect, dstRect, paint)
                    currentX += bitmap.width
                }
                Log.d("mergeMultipleImages result Bitmap width: " + mergedBitmap.width + ", height: " + mergedBitmap.height)
                return mergedBitmap
            }
    
            suspend fun compressImages(bitmap: Bitmap): ByteArray? {
                return withContext(Dispatchers.Default) {
                    Log.d(" start compressImages: ")
                    val outputStream = ByteArrayOutputStream()
                    var quality = 100
                    bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream)
                    while (outputStream.size() / KB > MAX_IMAGE_SIZE && quality > 0) {
                        outputStream.reset()
                        quality -= 1
                        bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream)
                    }
                    Log.d("compressImages:end  ${outputStream.size()}")
                    val saveCompressImage = saveCompressImage(
                        getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS),
                        outputStream
                    )
                    Log.d("saveCompressImage: $saveCompressImage")
                    outputStream.toByteArray()
                }
            }
    
            private fun saveCompressImage(f: File, bos: ByteArrayOutputStream?): Boolean {
                val file = File(f,"compress.jpeg")
                Log.d("saveCompressImage : " + file.path)
                return try {
                    val fos = FileOutputStream(file)
                    bos?.writeTo(fos)
                    Log.d("saveCompressImage success")
                    fos.flush()
                    fos.close()
                    true
                } catch (e: Exception) {
                    Log.d("saveCompressImage error")
                    e.printStackTrace()
                    false
                }
            }
    
            companion object {
                private const val MAX_IMAGE_SIZE = 250
                private const val CROP_IMAGE_WIDTH_SIZE = 120  // 尺寸要保持一致
                private const val CROP_IMAGE_HEIGHT_SIZE = 121 // 尺寸要保持一致
                private const val CROP_OTHER_VIEW_IMAGE_X_POINT = 1288 // 其他的尺寸要保持一致 这个是额外添加的view
                private const val CROP_OTHER_VIEW_IMAGE_WIDTH_SIZE = 632 // 其他的尺寸要保持一致
                private const val CROP_OTHER_VIEW_IMAGE_HEIGHT_SIZE = 720 其他的尺寸
                private const val KB: Long = 1024
    
                fun intValidCheck(value: Long): Int {
                    if (value < Int.MIN_VALUE || value > Int.MAX_VALUE) {
                        throw ArithmeticException("Integer overflow")
                    }
                    return value.toInt()
                }
            }
        }
    
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  • 原文地址:https://blog.csdn.net/qq_42538455/article/details/136585009