Compress Android Studio File

Question

I’m trying to compress my File which in case is an image but it keeps going with sizes above 4MB someone would help me. Follows code below:

   @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (resultCode == RESULT_OK) {
        if (requestCode == REQUEST_TAKE_PHOTO || requestCode == REQUEST_PICK_PHOTO) {
            if (data != null) {
                // Get the Image from data
                Uri selectedImage = data.getData();

                String[] filePathColumn = {MediaStore.Images.Media.DATA};

                Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
                assert cursor != null;
                cursor.moveToFirst();


                int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                mediaPath = cursor.getString(columnIndex);

                // REDUZIR O TAMANHO DO ARQUIVO

                Bitmap bmp = BitmapFactory.decodeFile(mediaPath);
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                bmp.compress(Bitmap.CompressFormat.JPEG, 50, bos);


                if(imageView == null) {
                    imageView.setImageBitmap(BitmapFactory.decodeFile(mediaPath));
                }
                else if(imageView != null){
                    imageView2.setImageBitmap(BitmapFactory.decodeFile(mediaPath));
                } else if(imageView2 != null) {
                    imageView3.setImageBitmap(BitmapFactory.decodeFile(mediaPath));
                }
                cursor.close();

                postPath = mediaPath;
            }


        }else if (requestCode == CAMERA_PIC_REQUEST){
            if (Build.VERSION.SDK_INT > 21) {

                Glide.with(this).load(mImageFileLocation).into(imageView);
                postPath = mImageFileLocation;

            }else{
                Glide.with(this).load(fileUri).into(imageView);
                postPath = fileUri.getPath();
            }
        }
    }
    else if (resultCode != RESULT_CANCELED) {
        Toast.makeText(this, "Ocorreu um erro!", Toast.LENGTH_LONG).show();
    }
}

It’s probably something silly but I can’t seem to fix it, so please help me.