工具栏与PreferenceFragment重叠

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        android:elevation="4dp"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

    <FrameLayout
        android:id="@+id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

public class SettingsActivity extends AppCompatActivity {

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

        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        getFragmentManager().beginTransaction()
                .replace(R.id.fragment_container, new SettingsFragment())
                .commit();
    }

    // ...

}

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <!-- ... -->
    <item name="toolbarStyle">@style/ToolbarStyle</item>
</style>

<style name="ToolbarStyle" parent="Widget.AppCompat.Toolbar">
    <item name="android:background">?attr/colorPrimary</item>
    <item name="android:elevation">4dp</item>
    <item name="popupTheme">@style/ThemeOverlay.AppCompat.Light</item>
</style>