add checkout finish/abort by user telemetry

Author: ajungg

build.gradle

@@ -24,7 +24,7 @@ allprojects {
     }
 
     project.ext {
-        sdkVersion='0.9.0-beta5'
+        sdkVersion='0.9.0-beta6'
         versionCode=1
 
         compileSdkVersion=28

ui-integration/src/main/java/io/snabble/sdk/ui/integration/CheckoutFragment.java

@@ -6,7 +6,9 @@
 import android.view.View;
 import android.view.ViewGroup;
 
+import io.snabble.sdk.Checkout;
 import io.snabble.sdk.ui.SnabbleUI;
+import io.snabble.sdk.ui.telemetry.Telemetry;
 
 public class CheckoutFragment extends Fragment {
     @Override
@@ -18,6 +20,12 @@ public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle sa
     public void onDestroyView() {
         super.onDestroyView();
 
-        SnabbleUI.getProject().getCheckout().cancel();
+        Checkout checkout = SnabbleUI.getProject().getCheckout();
+        checkout.cancel();
+
+        if(checkout.getState() != Checkout.State.PAYMENT_APPROVED
+                && checkout.getState() != Checkout.State.NONE) {
+            Telemetry.event(Telemetry.Event.CheckoutAbortByUser);
+        }
     }
 }

ui/src/main/java/io/snabble/sdk/ui/checkout/CheckoutEncodedCodesView.java

@@ -25,6 +25,7 @@
 import io.snabble.sdk.ui.SnabbleUICallback;
 import io.snabble.sdk.ui.scanner.BarcodeFormat;
 import io.snabble.sdk.ui.scanner.BarcodeView;
+import io.snabble.sdk.ui.telemetry.Telemetry;
 
 class CheckoutEncodedCodesView extends FrameLayout implements View.OnLayoutChangeListener {
     private static final int MAX_CHARS = 2953; // qr-code 8 bit max
@@ -69,6 +70,8 @@ public void onClick(View v) {
                 if (uiCallback != null) {
                     uiCallback.showMainscreen();
                 }
+
+                Telemetry.event(Telemetry.Event.CheckoutFinishByUser);
             }
         });
 

ui/src/main/java/io/snabble/sdk/ui/telemetry/Telemetry.java

@@ -9,6 +9,8 @@ public enum Event {
         CheckoutSuccessful,
         CheckoutDeniedBySupervisor,
         CheckoutDeniedByPaymentProvider,
+        CheckoutFinishByUser,
+        CheckoutAbortByUser,
         ManuallyEnteredProduct,
         ScannedProduct,
         ScannedOnlineProduct,