getDeclaredMethod反射的获取

api 5以上版本

Camera camera = Camera.open(); 
Camera.Parameters params = camera.getParameters(); 
try 
{ 
    Method method = params.getClass().getDeclaredMethod("getSupportedFocusModes", (Class[]) null); 
    Object o = method.invoke(params, (Object[]) null); 
    Log.i("Camera Test", o.toString()); 
} 
catch (Exception e) 
{ 
    e.printStackTrace(); 
}