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 = 0for (b in bitmaps) {sumWidth = intValidCheck((sumWidth + b.width).toLong())}return sumWidth}private fun getMaxHeights(bitmaps: ArrayList<Bitmap>): Int {var max = bitmaps[0].heightfor (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 heightval 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 heightval 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 = 0var maxHeight = 0for (bitmap in bitmaps) {totalWidth += bitmap.widthif (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.WHITEmTextPaint.isAntiAlias = true*/var currentX = 0for (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 = 100bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream)while (outputStream.size() / KB > MAX_IMAGE_SIZE && quality > 0) {outputStream.reset()quality -= 1bitmap.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 = 250private 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viewprivate 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 = 1024fun intValidCheck(value: Long): Int {if (value < Int.MIN_VALUE || value > Int.MAX_VALUE) {throw ArithmeticException("Integer overflow")}return value.toInt()}}}