java - 按功能更改 fragment

Question

我在 android studio 中得到了基于 fragment 的 Activity

                    someFragment fragment = new someFragment();
                    android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
                    fragmentttTransaction.replace(R.id.frame,fragment);
                    fragmentttTransaction.commit();

我想通过一个函数来调用它，类似这样:

        public void gotofragment(String classname) {

    ...
}

我尝试使用 Class.forName(classname).newInstance() 但它不起作用，android studio 显示错误。

感谢您的帮助，提前致谢

Answer 1

你可以这样做:

    private void showFragment(String fragmentId) {
    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
    Fragment fragment = getSupportFragmentManager().findFragmentByTag(fragmentId);
    if (fragment == null) {
        if (fragmentId.equals("Type1") {
            fragment = Type1Fragment.newInstance();
        }else if (fragmentId.equals("Type2") {
            fragment = Type2Fragment.newInstance();
        }
        ft.replace(R.id.container, fragment, fragmentId).commit();
    }
}