Detection/app/src/main/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/device_1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_centerHorizontal="true"
        android:id="@+id/txtdevice1"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/device_2"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_centerHorizontal="true"
        android:layout_below="@+id/txtdevice1"
        android:id="@+id/txtdevice2"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/device_3"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_centerHorizontal="true"
        android:layout_below="@+id/txtdevice2"
        android:id="@+id/txtdevice3"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/device_4"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_centerHorizontal="true"
        android:layout_below="@+id/txtdevice3"
        android:id="@+id/txtdevice4"/>

    <Button
        android:id="@+id/btnEarthquakeLocation"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="0dp"
        android:text="@string/show_earthquake_location" />

    <Button
        android:id="@+id/buttonReadyToDetect"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@id/btnEarthquakeLocation"
        android:layout_alignParentStart="false"
        android:layout_alignParentEnd="false"
        android:layout_alignParentBottom="false"
        android:layout_centerInParent="true"
        android:text="@string/sensor_ready_to_detect" />

    <Button
        android:id="@+id/btnResetDB"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_above="@id/buttonReadyToDetect"
        android:layout_alignParentStart="false"
        android:layout_alignParentEnd="false"
        android:layout_alignParentBottom="false"
        android:layout_centerInParent="true"
        android:textColor="@color/black"
        android:text="@string/db_zur_cksetzen" />





</RelativeLayout>