📅  最后修改于: 2022-03-11 14:59:34.538000             🧑  作者: Mango
public static String resizeAndCompressImageBeforeSend(Context context,String filePath,String fileName){
final int MAX_IMAGE_SIZE = 700 * 1024; // max final file size in kilobytes
// First decode with inJustDecodeBounds=true to check dimensions of image
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath,options);
// Calculate inSampleSize(First we are going to resize the image to 800x800 image, in order to not have a big but very low quality image.
//resizing the image will already reduce the file size, but after resizing we will check the file size and start to compress image
options.inSampleSize = calculateInSampleSize(options, 800, 800);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
options.inPreferredConfig= Bitmap.Config.ARGB_8888;
Bitmap bmpPic = BitmapFactory.decodeFile(filePath,options);
int compressQuality = 100; // quality decreasing by 5 every loop.
int streamLength;
do{
ByteArrayOutputStream bmpStream = new ByteArrayOutputStream();
Log.d("compressBitmap", "Quality: " + compressQuality);
bmpPic.compress(Bitmap.CompressFormat.JPEG, compressQuality, bmpStream);
byte[] bmpPicByteArray = bmpStream.toByteArray();
streamLength = bmpPicByteArray.length;
compressQuality -= 5;
Log.d("compressBitmap", "Size: " + streamLength/1024+" kb");
}while (streamLength >= MAX_IMAGE_SIZE);
try {
//save the resized and compressed file to disk cache
Log.d("compressBitmap","cacheDir: "+context.getCacheDir());
FileOutputStream bmpFile = new FileOutputStream(context.getCacheDir()+fileName);
bmpPic.compress(Bitmap.CompressFormat.JPEG, compressQuality, bmpFile);
bmpFile.flush();
bmpFile.close();
} catch (Exception e) {
Log.e("compressBitmap", "Error on saving file");
}
//return the path of resized and compressed file
return context.getCacheDir()+fileName;
}
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
String debugTag = "MemoryInformation";
// Image nin islenmeden onceki genislik ve yuksekligi
final int height = options.outHeight;
final int width = options.outWidth;
Log.d(debugTag,"image height: "+height+ "---image width: "+ width);
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
}
Log.d(debugTag,"inSampleSize: "+inSampleSize);
return inSampleSize;
}