simple payment method filtering

Author: ajungg

CHANGELOG.md

@@ -1,6 +1,11 @@
 # Changelog  
 All notable changes to this project will be documented in this file.
 
+## [0.17.5]
+
+### Added
+- Simple filtering of payment methods
+
 ## [0.17.4]
 
 ### Fixed

build.gradle

@@ -23,7 +23,7 @@ allprojects {
     }
 
     project.ext {
-        sdkVersion='0.17.4'
+        sdkVersion='0.17.5'
         versionCode=1
 
         compileSdkVersion=29

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

@@ -170,7 +170,7 @@ public void onKeyguardResult(int resultCode) {
 
                         entries.add(e);
                     }
-                } else if (!paymentMethod.isShowOnlyIfCredentialsArePresent()){
+                } else if (!paymentMethod.isShowOnlyIfCredentialsArePresent()) {
                     final Entry e = new Entry();
                     e.text = descriptions.get(paymentMethod);
                     e.paymentMethod = paymentMethod;
@@ -216,9 +216,38 @@ public void onClick(View v) {
             }
         }
 
+        filterPaymentMethods();
+
         recyclerViewAdapter.notifyDataSetChanged();
     }
 
+    private void filterPaymentMethods() {
+        boolean hasPaymentMethodWithCredentials = false;
+        boolean hasGatekeeperTerminal = false;
+        for (Entry e : entries) {
+            if (e.paymentCredentials != null) {
+                hasPaymentMethodWithCredentials = true;
+            }
+
+            if (e.paymentMethod == PaymentMethod.GATEKEEPER_TERMINAL) {
+                hasGatekeeperTerminal = true;
+            }
+        }
+
+        if (hasPaymentMethodWithCredentials || hasGatekeeperTerminal) {
+            ArrayList<Entry> removals = new ArrayList<>();
+            for (Entry e : entries) {
+                if (e.paymentCredentials == null && e.paymentMethod.isRequiringCredentials()) {
+                    removals.add(e);
+                }
+            }
+
+            for (Entry e : removals) {
+                entries.remove(e);
+            }
+        }
+    }
+
     private List<PaymentCredentials> getPaymentCredentials(PaymentMethod pm) {
         ArrayList<PaymentCredentials> list = new ArrayList<>();