android 开发 drawerlayout出现退不回去的情况

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/id_drawerlayout2"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <FrameLayout
        android:id="@+id/id_framelayout2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#cd9a5b" >
    </FrameLayout>

    <LinearLayout
        android:id="@+id/id_linearlayout2"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="#45b97c"
        android:orientation="vertical" >

        <ListView
            android:id="@+id/id_lv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:divider="#CD853F"
            android:dividerHeight="2dp" >
        </ListView>
    </LinearLayout>

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