Prevent duplicates in list

app/src/main/java/com/adityapk/zcash/zqwandroid/DataModel.kt

@@ -24,10 +24,14 @@ object DataModel {
         transactions = null
     }
 
-    fun parseResponse(response: String) {
+    fun parseResponse(response: String) : Boolean {
         val json = Parser.default().parse(StringBuilder(response)) as JsonObject
-        when (json.string("command")) {
-            "getInfo" -> mainResponseData = Klaxon().parse<MainResponse>(response)
+
+        return when (json.string("command")) {
+            "getInfo" -> {
+                mainResponseData = Klaxon().parse<MainResponse>(response)
+                return false
+            }
             "getTransactions" -> {
                 transactions = json.array<JsonObject>("transactions").orEmpty().map { tx ->
                     TransactionItem(
@@ -39,7 +43,9 @@ object DataModel {
                         tx.string("txid") ?: "",
                         tx.long("confirmations") ?: 0)
                 }
+                return true
             }
+            else -> false
         }
     }
 

app/src/main/java/com/adityapk/zcash/zqwandroid/MainActivity.kt

@@ -75,7 +75,7 @@ class MainActivity : AppCompatActivity(), TransactionItemFragment.OnFragmentInte
             }
         }
 
-        updateUI()
+        updateUI(false)
     }
 
     enum class ConnectionStatus(val status: Int) {
@@ -111,7 +111,7 @@ class MainActivity : AppCompatActivity(), TransactionItemFragment.OnFragmentInte
 
         DataModel.ws = client.newWebSocket(request, listener)
 
-        updateUI()
+        updateUI(false)
     }
 
     private fun setMainStatus(status: String) {
@@ -122,9 +122,9 @@ class MainActivity : AppCompatActivity(), TransactionItemFragment.OnFragmentInte
     }
 
     @SuppressLint("SetTextI18n")
-    private fun updateUI() {
+    private fun updateUI(updateTxns: Boolean) {
         runOnUiThread {
-            Log.i(TAG, "Updating UI")
+            Log.i(TAG, "Updating UI $updateTxns")
 
             bottomNav.menu.findItem(R.id.action_bal).isChecked = true
             when (connStatus) {
@@ -133,9 +133,11 @@ class MainActivity : AppCompatActivity(), TransactionItemFragment.OnFragmentInte
                     scrollViewTxns.visibility = ScrollView.GONE
                     layoutConnect.visibility = ConstraintLayout.VISIBLE
                     swiperefresh.isRefreshing = false
-                    Handler().post {
-                        run {
-                            addPastTransactions(DataModel.transactions)
+                    if (updateTxns) {
+                        Handler().post {
+                            run {
+                                addPastTransactions(DataModel.transactions)
+                            }
                         }
                     }
                 }
@@ -161,9 +163,11 @@ class MainActivity : AppCompatActivity(), TransactionItemFragment.OnFragmentInte
                         balanceSmall.text = balText.substring(balText.length - 4, balText.length)
                         txtMainBalanceUSD.text = "$ " + DecimalFormat("#,##0.00").format(bal * zPrice)
                     }
-                    Handler().post {
-                        run {
-                            addPastTransactions(DataModel.transactions)
+                    if (updateTxns) {
+                        Handler().post {
+                            run {
+                                addPastTransactions(DataModel.transactions)
+                            }
                         }
                     }
                 }
@@ -283,7 +287,7 @@ class MainActivity : AppCompatActivity(), TransactionItemFragment.OnFragmentInte
         connStatus = ConnectionStatus.DISCONNECTED
         DataModel.clear()
 
-        updateUI()
+        updateUI(true)
     }
 
     private inner class EchoWebSocketListener : WebSocketListener() {
@@ -295,8 +299,7 @@ class MainActivity : AppCompatActivity(), TransactionItemFragment.OnFragmentInte
 
         override fun onMessage(webSocket: WebSocket?, text: String?) {
             Log.i(TAG, "Recieving $text")
-            DataModel.parseResponse(text!!)
-            updateUI()
+            updateUI(DataModel.parseResponse(text!!))
             Log.i(TAG, "parsed successfully")
         }