Drawer navigation duplo

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <!-- The main content view -->
    <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
    <!-- The navigation drawer -->
    <LinearLayout
        android:orientation="vertical"
        android:id="@+id/drawer_navigation"
        android:layout_height="match_parent"
        android:layout_width="240dp"
        style="?android:buttonBarStyle"
        android:divider="?android:dividerVertical"
        android:background="#FFF"
        android:layout_gravity="start">

        <Button
            android:id="@+id/btn_slide"
            style="?android:buttonBarButtonStyle"
            android:gravity="left|center_vertical"
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:text="Slide + Animation"/>

        <Button
            android:id="@+id/btn_presentation"
            style="?android:buttonBarButtonStyle"
            android:gravity="left|center_vertical"
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:text="Presentation"/>

        <Button
            android:id="@+id/btn_dialog_on_tablet"
            style="?android:buttonBarButtonStyle"
            android:gravity="left|center_vertical"
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:text="Dialog on Tablets"/>

        <Button
            android:id="@+id/btn_hidden_list"
            style="?android:buttonBarButtonStyle"
            android:gravity="left|center_vertical"
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:text="Hidden list" />
    </LinearLayout>

    <FrameLayout
        android:id="@+id/drawer_notifications"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:background="#FFF"
        android:layout_gravity="end">

        <TextView
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:text="When connected, your notifications will appear here"
            android:gravity="center_horizontal"
            android:layout_gravity="top|center_horizontal"
            />
    </FrameLayout>
</android.support.v4.widget.DrawerLayout>