Android应用中怎么实现一个软键盘隐藏功能

...
public static void hideKeyboard(Context ctx) {
    if (ctx != null) {
      View view = ((Activity) ctx).getCurrentFocus();
      if (view != null) {
        InputMethodManager inputManager = (InputMethodManager) ctx
            .getSystemService(Context.INPUT_METHOD_SERVICE);
        inputManager.hideSoftInputFromWindow(view.getWindowToken(),
            InputMethodManager.HIDE_NOT_ALWAYS);
      }
    }
}

public static void setupUI(View view, final Context ctx) {
    //Set up touch listener for non-text box views to hide keyboard.
    if(!(view instanceof EditText)) {
      view.setOnTouchListener(new OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
          hideKeyboard(ctx);
          return false;
        }
      });
    }
    //If a layout container, iterate over children and seed recursion.
    if (view instanceof ViewGroup) {
      for (int i = 0; i < ((ViewGroup) view).getChildCount(); i++) {
        View innerView = ((ViewGroup) view).getChildAt(i);
        setupUI(innerView, ctx);
      }
    }
  }
...
}

UtilApp.setupUI((RelativeLayout) findViewById(R.id.login_parent), mContext);