talk/examples/android/res/layout/activity_connect.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:weightSum="1"
        android:layout_margin="8dp"
        android:layout_centerHorizontal="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >
            <ImageButton
                android:id="@+id/add_room_button"
                android:background="@android:drawable/ic_menu_add"
                android:contentDescription="@string/add_room_description"
                android:layout_marginEnd="20dp"
                android:layout_width="48dp"
                android:layout_height="48dp"/>
            <ImageButton
                android:id="@+id/remove_room_button"
                android:background="@android:drawable/ic_delete"
                android:contentDescription="@string/remove_room_description"
                android:layout_marginEnd="20dp"
                android:layout_width="48dp"
                android:layout_height="48dp"/>
            <ImageButton
                android:id="@+id/connect_button"
                android:background="@android:drawable/sym_action_call"
                android:contentDescription="@string/connect_description"
                android:layout_marginEnd="20dp"
                android:layout_width="48dp"
                android:layout_height="48dp"/>
            <ImageButton
                android:id="@+id/connect_loopback_button"
                android:background="@drawable/ic_loopback_call"
                android:contentDescription="@string/connect_loopback_description"
                android:layout_width="48dp"
                android:layout_height="48dp"/>
    </LinearLayout>
    <TextView
            android:id="@+id/room_edittext_description"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:text="@string/room_description"/>
    <EditText
            android:id="@+id/room_edittext"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:imeOptions="actionDone"/>
    <TextView
            android:id="@+id/room_listview_description"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:lines="1"
            android:maxLines="1"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:text="@string/room_names"/>
    <ListView
            android:id="@+id/room_listview"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:choiceMode="singleChoice"
            android:listSelector="@android:color/darker_gray"
            android:drawSelectorOnTop="false" />

</LinearLayout>