made listmanagers enums

app/src/main/java/com/a1/nextlocation/recyclerview/CouponListManager.java

@@ -4,15 +4,18 @@ import android.content.Context;
 
 import com.a1.nextlocation.data.Coupon;
 
+import java.util.ArrayList;
 import java.util.List;
 
-public class CouponListManager {
+public enum CouponListManager {
+    INSTANCE;
 
     private List<Coupon> couponList;
     private Context context;
 
-    public CouponListManager(Context context){
+    public void setContext(Context context) {
         this.context = context;
+        this.couponList = new ArrayList<>();
     }
 
     public List<Coupon> getCouponList() {

app/src/main/java/com/a1/nextlocation/recyclerview/LocationListManager.java

@@ -4,16 +4,18 @@ import android.content.Context;
 
 import com.a1.nextlocation.data.Location;
 
+import java.util.ArrayList;
 import java.util.List;
 
-public class LocationListManager {
+public enum LocationListManager {
+    INSTANCE;
 
     private List<Location> locationList;
     private Context context;
 
-    public LocationListManager(Context context){
+    public void setContext(Context context) {
         this.context = context;
-
+        this.locationList = new ArrayList<>();
     }
 
     public List<Location> getLocationList() {

app/src/main/java/com/a1/nextlocation/recyclerview/RouteListManager.java

@@ -4,17 +4,21 @@ import android.content.Context;
 
 import com.a1.nextlocation.data.Route;
 
+import java.util.ArrayList;
 import java.util.List;
 
-public class RouteListManager{
+public enum RouteListManager{
+    INSTANCE;
 
     private List<Route> routeList;
     private Context context;
 
-    public RouteListManager(Context context){
+    public void setContext(Context context) {
         this.context = context;
+        this.routeList = new ArrayList<>();
     }
 
+
     public List<Route> getRouteList() {
         return routeList;
     }