[platform] fixbug: crash on close for HashMap

- for (x : HashMap.keySet()) then remove x in for loop

Author: dna2github

app/app/src/main/java/seven/drawalive/nodebase/NodeBase.java

@@ -44,6 +44,8 @@ protected void onCreate(Bundle savedInstanceState) {
    @Override
    protected void onDestroy() {
       Permission.keepScreen(this, false);
+      // if want to keep service running in backend
+      // comment out this line and add "Stop Service" somewhere
       NodeService.stopService(this);
       super.onDestroy();
    }

app/app/src/main/java/seven/drawalive/nodebase/NodeService.java

@@ -120,7 +120,10 @@ public void onDestroy() {
    }
 
    private void stopNodeApps() {
-      for(String name : services.keySet()) {
+      int n = services.keySet().size();
+      String[] keys = new String[n];
+      services.keySet().toArray(keys);
+      for(String name : keys) {
          stopNodeApp(name);
       }
    }