滚动视图导致汉堡包图标不起作用

Question

所以我使用的是Android Studio提供的默认导航抽屉模板的修改版本。工具栏左上方有一个图标，用于打开导航抽屉，它可以在大多数片段中使用。但是，当我移动到我的活动中的一个片段时，图标不起作用。这是具有滚动视图的少数片段之一，我已经看到删除滚动视图允许按钮再次工作。

有没有人知道如何在让按钮工作的同时保持滚动视图？

问题片段的布局文件（省略上下文名称）：

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:paddingTop="@dimen/topmargin"
    tools:context="com.example....FAQFragment">
    <LinearLayout
        android:id="@+id/faqLayout"
        android:paddingLeft="@dimen/textSideMargin"
        android:paddingStart="@dimen/textSideMargin"
        android:paddingEnd="@dimen/textSideMargin"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </LinearLayout>
</ScrollView>

main.xml中：

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <include
        layout="@layout/navbar"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></FrameLayout>
    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:menu="@menu/sidebarcontent" />
</android.support.v4.widget.DrawerLayout>

片段代码：

public class FAQFragment extends Fragment {
    private ArrayList<String> questions;
    private ArrayList<String> answers;
    private int currentlyVisible = -1;

    public FAQFragment() {
        // Required empty public constructor
    }

    public static FAQFragment newInstance() {
        FAQFragment fragment = new FAQFragment();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        //todo: figure out why the scroll view is causing the tool bar to not work
        ((AppCompatActivity) getActivity()).getSupportActionBar().setTitle(getString(R.string.faqHeader));
        View view = inflater.inflate(R.layout.fragment_faq, container, false);
        LinearLayout mainView = (LinearLayout) view.findViewById(R.id.faqLayout);
        readQuestionFile();
        for(int i = 0; i < questions.size(); i++) {
            TextView tv = new TextView(getActivity());
            tv.setTag(i);
            tv.setText(questions.get(i));
            LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
            params.bottomMargin = 5;
            tv.setLayoutParams(params);
            tv.setTextSize(16);
            tv.setTypeface(Typeface.DEFAULT_BOLD);
            tv.setTextColor(ContextCompat.getColor(getActivity(), R.color.mainColor));
            tv.setOnClickListener(new View.OnClickListener() {
                public void onClick(View view) {
                    clicked(view);
                }
            });
            mainView.addView(tv);

            TextView tv2 = new TextView(getActivity());
            tv2.setTag("answer");
            tv2.setText(answers.get(i));
            tv2.setLayoutParams(params);
            tv2.setTextSize(16);
            tv2.setVisibility(View.GONE);
            mainView.addView(tv2);
        }

        TextView copyright = new TextView(getActivity());
        copyright.setTextSize(14);
        LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        copyright.setGravity(Gravity.CENTER_HORIZONTAL);
        copyright.setLayoutParams(params);
        copyright.setTypeface(Typeface.DEFAULT_BOLD);
        copyright.setTextColor(ContextCompat.getColor(getActivity(), R.color.mainColor));
        copyright.setText("\n" + getString(R.string.copyright));
        mainView.addView(copyright);

        //todo: all the numbers here (text size) should refer to dimens.xml
        return view;
    }

片段交易：

   private void changeFrag(Fragment f) {
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        currentFrag = f;
        fragmentTransaction.replace(R.id.content_frame, currentFrag);
        fragmentTransaction.addToBackStack(null);
        fragmentTransaction.commit();
    }

谢谢！