imageCompressing

public class ImageCompression extends AsyncTask<String, Void, String> {
 private Context context;
 private static final float maxHeight = 1280.0f;
 private static final float maxWidth = 1280.0f;
 public ImageCompression(Context context){
 this.context=context;
 }
 @Override
 protected String doInBackground(String... strings) {
 if(strings.length == 0 || strings[0] == null)
 return null;
 return compressImage(strings[0]);
 }
 protected void onPostExecute(String imagePath){
 // imagePath is path of new compressed image.
 }
 public String compressImage(String imagePath) {
 Bitmap scaledBitmap = null;
 BitmapFactory.Options options = new BitmapFactory.Options();
 options.inJustDecodeBounds = true;
 Bitmap bmp = BitmapFactory.decodeFile(imagePath, options);
 int actualHeight = options.outHeight;
 int actualWidth = options.outWidth;
 float imgRatio = (float) actualWidth / (float) actualHeight;
 float maxRatio = maxWidth / maxHeight;
 if (actualHeight > maxHeight || actualWidth > maxWidth) {
 if (imgRatio < maxRatio) {
 imgRatio = maxHeight / actualHeight;
 actualWidth = (int) (imgRatio * actualWidth);
 actualHeight = (int) maxHeight;
 } else if (imgRatio > maxRatio) {
 imgRatio = maxWidth / actualWidth;
 actualHeight = (int) (imgRatio * actualHeight);
 actualWidth = (int) maxWidth;
 } else {
 actualHeight = (int) maxHeight;
 actualWidth = (int) maxWidth;
 }
 }
 options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight);
 options.inJustDecodeBounds = false;
 options.inDither = false;
 options.inPurgeable = true;
 options.inInputShareable = true;
 options.inTempStorage = new byte[16 * 1024];
 try {
 bmp = BitmapFactory.decodeFile(imagePath, options);
 } catch (OutOfMemoryError exception) {
 exception.printStackTrace();
 }
 try {
 scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.RGB_565);
 } catch (OutOfMemoryError exception) {
 exception.printStackTrace();
 }
 float ratioX = actualWidth / (float) options.outWidth;
 float ratioY = actualHeight / (float) options.outHeight;
 float middleX = actualWidth / 2.0f;
 float middleY = actualHeight / 2.0f;
 Matrix scaleMatrix = new Matrix();
 scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);
 Canvas canvas = new Canvas(scaledBitmap);
 canvas.setMatrix(scaleMatrix);
 canvas.drawBitmap(bmp, middleX - bmp.getWidth() / 2, middleY - bmp.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG));
 if(bmp!=null)
 {
 bmp.recycle();
 }
 ExifInterface exif;
 try {
 exif = new ExifInterface(imagePath);
 int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 0);
 Matrix matrix = new Matrix();
 if (orientation == 6) {
 matrix.postRotate(90);
 } else if (orientation == 3) {
 matrix.postRotate(180);
 } else if (orientation == 8) {
 matrix.postRotate(270);
 }
 scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0, scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix, true);
 } catch (IOException e) {
 e.printStackTrace();
 }
 FileOutputStream out = null;
 String filepath = getFilename();
 try {
 out = new FileOutputStream(filepath);
 //write the compressed bitmap at the destination specified by filename.
 scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out);
 } catch (FileNotFoundException e) {
 e.printStackTrace();
 }
 return filepath;
 }
 public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
 final int height = options.outHeight;
 final int width = options.outWidth;
 int inSampleSize = 1;
 if (height > reqHeight || width > reqWidth) {
 final int heightRatio = Math.round((float) height / (float) reqHeight);
 final int widthRatio = Math.round((float) width / (float) reqWidth);
 inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
 }
 final float totalPixels = width * height;
 final float totalReqPixelsCap = reqWidth * reqHeight * 2;
 while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
 inSampleSize++;
 }
 return inSampleSize;
 }
 public String getFilename() {
 File mediaStorageDir = new File(Environment.getExternalStorageDirectory()
 + "/Android/data/"
 + context.getApplicationContext().getPackageName()
 + "/Files/Compressed");
 // Create the storage directory if it does not exist
 if (! mediaStorageDir.exists()){
 mediaStorageDir.mkdirs();
 }
 String mImageName="IMG_"+ String.valueOf(System.currentTimeMillis()) +".jpg";
 String uriString = (mediaStorageDir.getAbsolutePath() + "/"+ mImageName);;
 return uriString;
 }
}