diff --git a/android/app/src/main/java/de/hft/geotracker/activities/MainActivity.kt b/android/app/src/main/java/de/hft/geotracker/activities/MainActivity.kt
index 1667fd0..ccaf3bf 100644
--- a/android/app/src/main/java/de/hft/geotracker/activities/MainActivity.kt
+++ b/android/app/src/main/java/de/hft/geotracker/activities/MainActivity.kt
@@ -17,6 +17,7 @@ import de.hft.geotracker.GeofenceBroadcastReceiver
 import de.hft.geotracker.R
 import de.hft.geotracker.retrofit.*
 import kotlinx.android.synthetic.main.activity_home.*
+import kotlinx.android.synthetic.main.dropdown_menu.*
 import okhttp3.OkHttpClient
 import retrofit2.Call
 import retrofit2.Callback
@@ -32,6 +33,7 @@ class MainActivity : AppCompatActivity() {
     lateinit var geofence: Geofence
     lateinit var actionButton: TextView
     var running = false
+    var accName: String? = null
     lateinit var accounts: ValuesTimetrackAccounts
     lateinit var service: GeofenceService
     lateinit var locationRequest: LocationRequest
@@ -151,6 +153,24 @@ class MainActivity : AppCompatActivity() {
 
     private fun callStartStop() {
         running = !running
+        if (running) {
+            account_spinner.visibility = View.GONE
+        } else {
+            account_spinner.visibility = View.VISIBLE
+        }
+        if (!accName.isNullOrEmpty()) {
+            val call = service.triggerTracking(accName!!)
+            call.enqueue(object : Callback<ValuesTracking> {
+                override fun onResponse(call: Call<ValuesTracking>, response: Response<ValuesTracking>) {
+                    latitude.text = response.body()?.startdate
+                    longitude.text = response.body()?.enddate
+                    println("Tracking event successful!")
+                }
+                override fun onFailure(call: Call<ValuesTracking>, t: Throwable) {
+                    println("Problem at start tracking: " + t.message)
+                }
+            })
+        }
         println("StartStop pressed: $running")
         //ToDO call /track Endpoint
     }
@@ -193,7 +213,8 @@ class MainActivity : AppCompatActivity() {
                 position: Int,
                 id: Long
             ) {
-                if (!accountNames.get(0).equals("rich")) {
+                if (!accountNames.get(0).equals("None")) {
+                    accName = accounts.entries.get(position).name
                     display_description.setText(accounts.entries.get(position).description)
                     display_revenue.setText(accounts.entries.get(position).revenue.toString())
                 } else {
diff --git a/android/app/src/main/java/de/hft/geotracker/retrofit/GeofenceService.kt b/android/app/src/main/java/de/hft/geotracker/retrofit/GeofenceService.kt
index 65cb132..d437f99 100644
--- a/android/app/src/main/java/de/hft/geotracker/retrofit/GeofenceService.kt
+++ b/android/app/src/main/java/de/hft/geotracker/retrofit/GeofenceService.kt
@@ -4,6 +4,7 @@ import retrofit2.Call
 import retrofit2.http.Body
 import retrofit2.http.GET
 import retrofit2.http.POST
+import retrofit2.http.Query
 
 interface GeofenceService {
     @POST("/login")
@@ -14,4 +15,7 @@ interface GeofenceService {
 
     @GET("accounts")
     fun getAccounts(): Call<EmbeddedAccounts>
+
+    @GET("track")
+    fun triggerTracking(@Query("account") account: String): Call<ValuesTracking>
 }
\ No newline at end of file
diff --git a/android/app/src/main/java/de/hft/geotracker/retrofit/ValuesTracking.kt b/android/app/src/main/java/de/hft/geotracker/retrofit/ValuesTracking.kt
new file mode 100644
index 0000000..50756e9
--- /dev/null
+++ b/android/app/src/main/java/de/hft/geotracker/retrofit/ValuesTracking.kt
@@ -0,0 +1,30 @@
+package de.hft.geotracker.retrofit
+
+import com.google.gson.annotations.SerializedName
+
+class ValuesTracking(
+    duration: Int,
+    start: String,
+    end: String,
+    account: String,
+    user: String,
+    type: String
+) {
+    @SerializedName("duration")
+    var duration = duration
+
+    @SerializedName("startdate")
+    var startdate = start
+
+    @SerializedName("enddate")
+    var enddate = end
+
+    @SerializedName("account")
+    var account = account
+
+    @SerializedName("username")
+    var username = user
+
+    @SerializedName("type")
+    var type = type
+}
\ No newline at end of file
diff --git a/android/app/src/main/res/layout/activity_home.xml b/android/app/src/main/res/layout/activity_home.xml
index 5474830..f267e14 100644
--- a/android/app/src/main/res/layout/activity_home.xml
+++ b/android/app/src/main/res/layout/activity_home.xml
@@ -188,11 +188,11 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginStart="16dp"
+        android:layout_marginTop="16dp"
         android:layout_marginEnd="16dp"
         android:text="dummy"
         android:textAppearance="@style/text_style"
         android:textColor="@color/logo_white"
-        app:layout_constraintBottom_toTopOf="@+id/longitude"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/display_revenue_layout" />
@@ -202,12 +202,13 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginStart="16dp"
+        android:layout_marginTop="16dp"
         android:layout_marginEnd="16dp"
         android:text="dummy"
         android:textAppearance="@style/text_style"
-        app:layout_constraintBottom_toTopOf="@+id/altitude"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent" />
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/latitude" />
 
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file