Gadgetbridge/app/src/main/res/layout/activity_controlcenter.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="nodomain.freeyourgadget.gadgetbridge.ControlCenter">

    <TextView
        android:id="@+id/label"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="From:" />
    <EditText
        android:id="@+id/editTitle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/label"
        android:singleLine="true"
        android:inputType="textEmailAddress" />
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:layout_below="@+id/editTitle"
        android:text="Message"/>
    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textMultiLine"
        android:ems="10"
        android:id="@+id/editContent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignRight="@+id/editTitle"
        android:layout_alignEnd="@+id/editTitle"
        android:layout_below="@+id/textView" />
    <Button
        android:id="@+id/sendButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Send to Pebble"
        android:layout_above="@+id/testNotificationButton"
        android:layout_alignParentStart="true" />
    <Button
        android:id="@+id/testNotificationButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Create test Notification"
        android:layout_alignParentBottom="true"
        android:layout_alignParentStart="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="start Service"
        android:id="@+id/startServiceButton"
        android:layout_above="@+id/sendButton"
        android:layout_alignEnd="@+id/sendButton"
        android:layout_alignParentStart="true" />
</RelativeLayout>