sheishuoAPP/app/res/layout/avchat_settings_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/app_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay"
        app:elevation="0dp">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:titleTextAppearance="@style/Toolbar.TitleText">
        </android.support.v7.widget.Toolbar>
    </android.support.design.widget.AppBarLayout>

    <fragment
        android:id="@+id/fragment"
        android:name="com.sheishuo.app.avchat.activity.AVChatSettingsFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>


</LinearLayout>