碎片不会后悔

Question

在我的应用程序中，我使用了一个活动的片段。我创建了一个方法，它将调用新的片段。该方法工作正常，但是当我按下后退按钮我的应用程序关闭，即使我已经在后面放置片段stack.Please帮帮我。

代码

    public void replaceFragment(Fragment fragment, boolean addToBackStack) {

        try {
            String backStateName = fragment.getClass().getName();
            String fragmentTag = backStateName;


            FragmentManager manager = getFragmentManager();
//            boolean fragmentPopped = manager.popBackStackImmediate(backStateName, 0);
            if (manager.findFragmentByTag(fragmentTag) == null) {
                FragmentTransaction ft = manager.beginTransaction();
                ft.replace(R.id.frag_container, fragment, fragmentTag);
                ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
                if (addToBackStack) {
                    ft.addToBackStack(backStateName);
                } else {
                    ft.addToBackStack(null);
                }
                ft.commit();
            }
        } catch (Exception e) {

            e.printStackTrace();
        }
    }

Answer 1

使用此：

EditProfileFragment mEditProfileFragment = new EditProfileFragment();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager
                    .beginTransaction();
fragmentTransaction.replace(R.id.content_frame,
                    mEditProfileFragment);
fragmentTransaction.addToBackStack(MyProfileFragment.class
                    .getName());
fragmentTransaction.commit();

Answer 2

您是否正在处理活动？如下代码：

@Override
public void onBackPressed()
{
    FragmentManager fragmentManager = getSupportFragmentManager();
    int count = fragmentManager.getBackStackEntryCount();
    if (1 < count)
    {       
        fragmentManager.popBackStackImmediate();
    }else
    {
        super.onBackPressed();          
    }
}