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);
        }
    }
}