未删除或替换Android片段

Question

我正在尝试从容器中移除或替换碎片。该片段是在活动的onCreate（）上创建的，一旦单击按钮，该片段应会消失。但是，我无法删除或替换该片段。

出于绝望，我尝试将容器替换为背景色相同的空白片段，但是空白片段只会显示在另一个片段下方，而不是被替换。我有一个清除所有片段的方法，该片段适用于除dashboardInfoFragment之外的所有实例。我不确定这是因为我是在onCreate（）中创建它还是其他我无法识别的东西。与使用片段事务添加时一样，使用替换得到的结果相同。我从未能够从此应用程序中删除单个片段，但clearFragments（）可用于其他所有片段。

我已经浏览了无数关于该主题的帖子，并尝试了所有方法，但是我无法通过引用该片段或通过标记或在clearFragments（）中删除此片段，因此，我们将不胜感激。

以下是活动的相关片段

public class DashboardActivity extends AppCompatActivity {

DashboardInfoFragment dashboardInfoFragment;

@Override
protected void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dashboard);

    dashboardInfoFragment = DashboardInfoFragment.newInstance();
    replaceFragment(R.id.dashboard_table_fragment_place, dashboardInfoFragment, "dashboardInfoFragment");

    menuButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            if (!isClassMenuOpen) {
                startClassMenu();

            } else {
                clearAllFragments();
                startClassMenu();
            }
        }
    });

    homeButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            clearAllFragments();

            replaceFragment(R.id.dashboard_table_fragment_place,     dashboardInfoFragment, "dashboardInfoFragment");
        }
    });
}

public void startClassMenu() {
    clearAllFragments();

// This doesn't work
    removeSingleFragment(R.id.dashboard_table_fragment_place, dashboardInfoFragment, "dashboardInfoFragment");

    dashboardInfoFragment = DashboardInfoFragment.newInstance();
    replaceFragment(R.id.dashboard_table_fragment_place, dashboardInfoFragment, "dashboardInfoFragment");

// Trying to replace with blank fragment but gets displayed below the dashboardInfoFragment
    blankFragment = BlankFragment.newInstance();
    replaceFragment(R.id.dashboard_table_fragment_place, blankFragment, "blankFragment");

    ClassMenuFragment classMenuFragment = ClassMenuFragment.newInstance(classList);
    replaceFragment(R.id.class_menu_fragment_place, classMenuFragment, "classMenuFragment");
}

// Removes all fragments except for dashboardInfoFragment
public void clearAllFragments() {

    try {
        FragmentManager manager = getSupportFragmentManager();
        manager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);

        isClassMenuOpen = false;
        isSettingsMenuOpen = false;
        isModuleOptionsMenuOpen = false;

    } catch (Exception e) {

        e.printStackTrace();
    }
}

public void replaceFragment(int id, Fragment fragment, String tag) {
    FragmentManager manager = getSupportFragmentManager();
    FragmentTransaction transaction = manager.beginTransaction();
    transaction.replace(id, fragment);
    transaction.addToBackStack(tag);
    transaction.commit();
}


    // Some of my attempts at removing the fragment
public void removeSingleFragment(int container, Fragment fragment, String tag) {
//    if (getSupportFragmentManager().findFragmentById(container) != null) {
//        getSupportFragmentManager()
//                    .beginTransaction().
//                            remove(getSupportFragmentManager().findFragmentById(container)).commit();
//        }
//
//        getSupportFragmentManager()
//                .beginTransaction()
//                .replace(container, fragment)
//                .commit();

        //FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

//        if (fragment != null) {
//            transaction.remove(fragment);
//              transaction.commit().setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
//            fragment = null;
//
//        }
            FragmentManager fragmentManager =  getSupportFragmentManager();
            FragmentTransaction transaction =  fragmentManager.beginTransaction();


    if(fragment!=null&&fragment.isAdded()) {
        transaction =  fragmentManager.beginTransaction();
        transaction.remove(fragment);
        transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE);
        transaction.commitAllowingStateLoss();
    }

    transaction =  fragmentManager.beginTransaction();
    transaction.replace(container, fragment, tag).commit();
}
        }

    });

}