如何从sd卡正确编辑图像并将其保存回来

FileInputStream in = new FileInputStream(\"/mnt/sdcard/DCIM/1302779969138\");
BufferedInputStream buf = new BufferedInputStream(in)                                 
Bitmap bm = BitmapFactory.decodeStream(buf);
File isfile = new File(Environment.getExternalStorageDirectory(),\"/DCIM/1302779969138\");
FileOutputStream fout = new FileOutputStream(isfile);
Bitmap bitmap = null;

bitmap = Bitmap.createScaledBitmap(bm, 350, 350, true);
bitmap.compress(CompressFormat.JPEG, 20, fout);

Fileoutputsteam

inputStream