Actionbar Covering My Activity

I have an activity whose xml is:

<LinearLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><android.support.design.widget.AppBarLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:theme="@style/AppTheme.AppBarOverlay"><android.support.v7.widget.Toolbarandroid:id="@+id/toolbar"android:layout_width="match_parent"android:layout_height="?attr/actionBarSize"android:background="?attr/colorPrimary"app:popupTheme="@style/AppTheme.PopupOverlay" /></android.support.design.widget.AppBarLayout><android.support.v7.widget.RecyclerViewxmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/reciclador"android:layout_width="match_parent"android:layout_height="match_parent"android:padding="3dp"android:scrollbars="vertical" /><includelayout="@layout/content_main" /></LinearLayout>