由于某些原因，在抽屉外部点击时导航抽屉不会关闭。它是mainactivity中listview的另一个片段：

当点击右边的片段时，它不会关闭抽屉，相反，它的行为就像片段占据了整个屏幕，而click侦听器在片段中仍然是活动的。
活动\u main.xml：

<RelativeLayout 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/main_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/holo_orange_dark"
    android:minHeight="?attr/actionBarSize"
    android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
    app:title="Apartment Guide"
    app:titleTextColor="@android:color/white" />

<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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/toolbar"
    tools:context=".MainActivity">

    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="220dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="@color/white"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/header"
        app:itemTextColor="@android:color/darker_gray"
        app:menu="@menu/drawer_menu" />

</android.support.v4.widget.DrawerLayout>

<FrameLayout
    android:id="@+id/fragment_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/toolbar">

</FrameLayout>

mainactivity.java:

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    mDrawerLayout = findViewById(R.id.drawer);
    fragmentContent = findViewById(R.id.fragment_content);
    mToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_opened, R.string.drawer_closed) {
        @Override
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            getSupportActionBar().setTitle(R.string.drawer_opened);
        }

        @Override
        public void onDrawerClosed(View drawerView) {
            super.onDrawerClosed(drawerView);
            getSupportActionBar().setTitle(R.string.drawer_closed);
        }

        @Override
        public void onDrawerSlide(View drawerView, float slideOffset) {
            super.onDrawerSlide(drawerView, slideOffset);
            fragmentContent.setTranslationX(slideOffset * drawerView.getWidth());
            mDrawerLayout.bringChildToFront(drawerView);
            mDrawerLayout.requestLayout();
        }
    };
    mToggle.getDrawerArrowDrawable().setColor(getResources().getColor(R.color.white));

    mDrawerLayout.addDrawerListener(mToggle);
    mToggle.syncState();
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    if (savedInstanceState == null)
        selectDrawerItem(null);

    NavigationView navigationView = findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
            selectDrawerItem(menuItem);
            return true;
        }
    });
}

不知道我哪里做错了，因为在抽屉区域外点击时关闭抽屉应该是抽屉布局中的默认行为。