res/layout/activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:tools="http://schemas.android.com/tools"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:paddingBottom="@dimen/activity_vertical_margin"
              android:paddingLeft="@dimen/activity_horizontal_margin"
              android:paddingRight="@dimen/activity_horizontal_margin"
              android:paddingTop="@dimen/activity_vertical_margin"
              tools:context=".MainActivity" >

  <LinearLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:orientation="horizontal"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      tools:context=".MainActivity">

    <TextView
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:layout_weight="1"
        android:text="@string/port_input"/>

    <EditText
        android:id="@+id/portNumber"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:layout_weight="1"
        android:inputType="number"
        android:text="@string/port_number_initial"/>

  </LinearLayout>

  <LinearLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:orientation="horizontal"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      tools:context=".MainActivity">

    <Button
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:layout_weight="1"
        android:text="@string/epm_attach"
        android:id="@+id/attachButton"
        android:onClick="attachEpm" />

    <Button
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:layout_weight="1"
        android:id="@+id/detachButton"
        android:text="@string/epm_detach"
        android:onClick="detachEpm" />

  </LinearLayout>

  <TextView
      android:id="@+id/statusText"
      android:layout_height="wrap_content"
      android:layout_width="fill_parent"
      android:layout_weight="1"
      android:text="@string/status_text_initial"/>

</LinearLayout>