Android 最有效的管理软键盘开启、关闭

   protected void showKeyboard(boolean isShow) {
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        
        if (null == imm)
            return;

        if (isShow) {
            if (getCurrentFocus() != null) {
                //有焦点打开
                imm.showSoftInput(getCurrentFocus(), 0);
            } else {
                //无焦点打开
                imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
            }
        } else {
            if (getCurrentFocus() != null) {
                //有焦点关闭
                imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
            } else {
                //无焦点关闭
                imm.toggleSoftInput(InputMethodManager.HIDE_IMPLICIT_ONLY, 0);
            }
        }
    }