Now checking if address already has the tx before adding. Sometimes...

Now checking if address already has the tx before adding. Sometimes transactions would be duplicated.
Changed Map loop to use entrySet() instead of keySet()/get() for efficiency.

app/src/main/java/com/samourai/sentinel/api/APIFactory.java

@@ -26,6 +26,7 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 public class APIFactory	{
 
@@ -229,14 +230,21 @@ public class APIFactory	{
                     }
 
                     if(addr != null)  {
-
-                        Tx tx = new Tx(hash, _addr, amount, ts, (latest_block > 0L && height > 0L) ? (latest_block - height) + 1 : 0);
-
                         if(!xpub_txs.containsKey(addr))  {
                             xpub_txs.put(addr, new ArrayList<Tx>());
                         }
-                        xpub_txs.get(addr).add(tx);
 
+                        List<Tx> addrTxs = xpub_txs.get(addr);
+                        boolean txAddedPreviously = false;
+                        for (Tx tx : addrTxs) {
+                            if (tx.getHash().equals(hash)) {
+                                txAddedPreviously = true;
+                                break;
+                            }
+                        }
+                        if (!txAddedPreviously) {
+                            xpub_txs.get(addr).add(new Tx(hash, _addr, amount, ts, (latest_block > 0L && height > 0L) ? (latest_block - height) + 1 : 0));
+                        }
                     }
                 }
 
@@ -271,9 +279,8 @@ public class APIFactory	{
     public List<Tx> getAllXpubTxs()  {
 
         List<Tx> ret = new ArrayList<Tx>();
-        for(String key : xpub_txs.keySet())  {
-            List<Tx> txs = xpub_txs.get(key);
-            ret.addAll(txs);
+        for (Map.Entry<String, List<Tx>> entry : xpub_txs.entrySet()) {
+            ret.addAll(entry.getValue());
         }
 
         Collections.sort(ret, new TxMostRecentDateComparator());