activity_teacher.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_teacher"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.darshanbshah.odsystem.TeacherActivity">

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:background="@color/colorPrimary"
        android:id="@+id/topHolder"
        android:layout_height="55dp">

        <TextView
            android:text="Pending ODs"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="12dp"
            android:id="@+id/pendingTitle"
            android:textAppearance="@style/TextAppearance.AppCompat.Display1"
            android:layout_alignBottom="@+id/button2"
            android:layout_alignParentStart="true"
            android:layout_weight="1"
            android:textColor="#FFF"
            android:layout_gravity="center_vertical"/>

        <Button
            android:text="Logout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/button2"
            android:onClick="signOut"
            android:layout_alignParentTop="true"
            android:layout_alignParentEnd="true"
            style="@style/Widget.AppCompat.Button.Borderless.Colored"
            android:layout_weight="1"
            android:layout_gravity="center_vertical"/>

    </LinearLayout>

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"

        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        android:layout_marginRight="@dimen/activity_horizontal_margin"
        android:layout_below="@+id/topHolder"
        android:layout_centerHorizontal="true">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

                <ListView
                    android:layout_width="match_parent"
                    android:layout_height="500dp"
                    android:id="@+id/listView">

                </ListView>

        </LinearLayout>
    </ScrollView>

</RelativeLayout>