現在のActivityのソフトキーボードを非表示

/**
 *  ( Activity， Fragment)
 */
public void hideSoftKeyboard(Activity activity) {
    View view = activity.getCurrentFocus();
    if (view != null) {
        InputMethodManager inputMethodManager = (InputMethodManager) activity.getSystemService(Activity.INPUT_METHOD_SERVICE);
        inputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
    }
}