Getting ready with java

activity_main.xml
<?xml version=”1.0″ encoding=”utf-8″?>
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android&#8221;
xmlns:app=”http://schemas.android.com/apk/res-auto&#8221;
android:layout_width=”match_parent”
android:layout_height=”match_parent”
android:orientation=”vertical”>

<android.support.v7.widget.Toolbar
android:id=”@+id/toolbar”
android:layout_width=”match_parent”
android:layout_height=”wrap_content”
android:background=”?attr/colorPrimary”
android:minHeight=”?attr/actionBarSize”
app:popupTheme=”@style/ThemeOverlay.AppCompat.Light”
android:theme=”@style/ThemeOverlay.AppCompat.Dark”
app:titleTextColor=”@android:color/white” />

<android.support.v4.widget.DrawerLayout
android:id=”@+id/drawerLayout”
android:layout_width=”match_parent”
android:layout_height=”match_parent”>

<LinearLayout
android:layout_width=”match_parent”
android:layout_height=”match_parent”
android:orientation=”vertical”>

<android.support.design.widget.TabLayout
android:id=”@+id/tab_layout”
android:layout_width=”match_parent”
android:layout_height=”wrap_content”
android:layout_below=”@+id/toolbar”
android:background=”@color/colorPrimary”
android:minHeight=”?attr/actionBarSize”
android:theme=”@style/ThemeOverlay.AppCompat.Dark.ActionBar” />

<android.support.v4.view.ViewPager
android:id=”@+id/view_pager”
android:layout_width=”match_parent”
android:layout_height=”wrap_content” />
</LinearLayout>


<android.support.design.widget.NavigationView
android:id=”@+id/nav_view”
android:layout_width=”wrap_content”
android:layout_height=”match_parent”
android:layout_gravity=”start”
android:fitsSystemWindows=”true”
app:menu=”@menu/drawer_menu” />

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