Saving image captured from camera to file in android -

hi in app trying take picture camera , store image in file object. writing file external storage when try retrieve file getting filenotfound exception. please me. here code used save file.

environment.getexternalstoragestate();

           file mediastoragedir = new file(getcachedir(),"appname");             //mediastoragedir.mkdir();            system.out.println("directory path "+mediastoragedir.getpath());            if (! mediastoragedir.exists()){                mediastoragedir.mkdirs();                 if (! mediastoragedir.mkdirs()){                     log.d("mycameraapp", "failed create directory");                  }             }             file   mediafile = new file(mediastoragedir.getpath() + file.separator +                     "img_"+ "mypic" + ".jpg"); 

try add

<uses-permission android:name="android.permission.write_external_storage" />  

to androidmanifest