android - 如何替换 fragment 存储的第一个历史记录并删除其他事务？

Question

我有三个 fragment a, b, c
我将 a 替换为主要 Activity

FragmentManager fm = getFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
transaction.add(R.id.fram_container, new Fragment1(), "tag1");
transaction.commit();

a 到 b

FragmentManager fm = getFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
transaction.replace(R.id.fram_container, new Fragment2(), "tag2");
transaction.commit();

和b到c

FragmentManager fm = getFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
transaction.replace(R.id.fram_container, new Fragment3(), "tag3");
transaction.commit();

在 c...

我希望 c 返回按下以使用 a 重定向，而无需在 c
中执行任何操作 我想在后退时跳过 b。

我能做什么以及如何做？

Answer 1

执行下面的代码后退

public void backToFragment(final Fragment fragment) {

    // go back to something that was added to the backstack
    getSupportFragmentManager().popBackStackImmediate(
            fragment.getClass().getName(), 0);
    // use 0 or the below constant as flag parameter
    // FragmentManager.POP_BACK_STACK_INCLUSIVE);

}