Path requests must specify a user by using UserEnvironment

String is = Environment.getExternalStorageState();
if (is.equals("mounted")) {
File sdRoot = null;

//Environment.setUserRequired(false);

try {
Class<?> environmentcls = Class.forName("android.os.Environment");
Method setUserRequiredM = environmentcls.getMethod("setUserRequired", boolean.class);
setUserRequiredM.invoke(null, false);


} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}


sdRoot = Environment.getExternalStorageDirectory();



}
}