fixed checkout state not updating when in a stopped activity

Author: ajungg

CHANGELOG.md

@@ -1,6 +1,12 @@
 # Changelog  
 All notable changes to this project will be documented in this file.
 
+## [0.13.17]
+
+### Fixed
+- Fixed payment status screen not updating when in a stopped activity 
+- Fixed scanner shopping cart button not updating when in a stopped activity
+
 ## [0.13.16]
 
 ### Changed

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

@@ -29,6 +29,7 @@ public class CheckoutView extends FrameLayout implements Checkout.OnCheckoutStat
     private ViewAnimator viewAnimator;
     private Checkout checkout;
     private DelayedProgressDialog progressDialog;
+    private Checkout.State currentState;
 
     public CheckoutView(Context context) {
         super(context);
@@ -75,6 +76,10 @@ public boolean onKey(DialogInterface dialogInterface, int i, KeyEvent keyEvent)
 
     @Override
     public void onStateChanged(Checkout.State state) {
+        if (state == currentState) {
+            return;
+        }
+
         if (state == Checkout.State.VERIFYING_PAYMENT_METHOD) {
             progressDialog.showAfterDelay(500);
         } else {
@@ -105,9 +110,10 @@ public void onStateChanged(Checkout.State state) {
                         .show();
                 break;
             case NONE:
-
                 break;
         }
+
+        currentState = state;
     }
 
     private void displayPaymentView() {
@@ -171,6 +177,7 @@ public void displayView(View view) {
 
     private void registerListeners() {
         checkout.addOnCheckoutStateChangedListener(this);
+        onStateChanged(checkout.getState());
     }
 
     private void unregisterListeners() {

ui/src/main/java/io/snabble/sdk/ui/scanner/SelfScanningView.java

@@ -460,6 +460,7 @@ private void registerListeners() {
 
         startBarcodeScanner();
         shoppingCart.addListener(shoppingCartListener);
+        updateCartButton();
     }
 
     private void unregisterListeners() {