diff --git a/android_test/app/src/main/java/org/stellar/javastellarsdkdemoapp/MainActivity.kt b/android_test/app/src/main/java/org/stellar/javastellarsdkdemoapp/MainActivity.kt
index 9cab3b2..fe3b2a3 100644
--- a/android_test/app/src/main/java/org/stellar/javastellarsdkdemoapp/MainActivity.kt
+++ b/android_test/app/src/main/java/org/stellar/javastellarsdkdemoapp/MainActivity.kt
@@ -137,23 +137,29 @@ fun MainPreview() {
 
 private fun testSDK(): String {
     return try {
-        // send request to horizon server
-        val server = Server("https://horizon.stellar.org")
-        val horizonResp = server.root().execute()
-        if (horizonResp == null || horizonResp.networkPassphrase != Network.PUBLIC.networkPassphrase) {
-            throw Exception("Query Horizon failed")
-        }
-
-        // send request to Soroban RPC server
-        val sorobanServer = SorobanServer("https://soroban-testnet.stellar.org:443")
-        if (sorobanServer.network.passphrase != Network.TESTNET.networkPassphrase) {
-            throw Exception("Query Soroban Server failed")
-        }
-
-        // Test Federation
         // Not enabled if Android SDK version is less than 26,
         // see https://stackoverflow.com/questions/64844311/certpathvalidatorexception-connecting-to-a-lets-encrypt-host-on-android-m-or-ea
         if (Build.VERSION.SDK_INT >= 26) {
+            // send request to horizon server
+            val server = Server("https://horizon.stellar.org")
+            val horizonResp = server.root().execute()
+            if (horizonResp == null || horizonResp.networkPassphrase != Network.PUBLIC.networkPassphrase) {
+                throw Exception("Query Horizon failed")
+            }
+
+            // send request to Soroban RPC server
+            val sorobanServer = SorobanServer("https://soroban-testnet.stellar.org:443")
+            if (sorobanServer.network.passphrase != Network.TESTNET.networkPassphrase) {
+                throw Exception("Query Soroban Server failed")
+            }
+
+            val xdr =
+                server.transactions().limit(1).includeFailed(false).execute().records.get(0).envelopeXdr
+            val tx: Transaction = Transaction.fromEnvelopeXdr(xdr, Network.PUBLIC) as Transaction
+            val resp = server.submitTransaction(tx)
+            Log.d("MainActivity", "testSDK resp: $resp")
+
+            // Test Federation
             val fedResp = Federation().resolveAddress("example*lobstr.co")
             if (fedResp == null || fedResp.accountId == null) {
                 throw Exception("Query Federation failed")
@@ -280,13 +286,6 @@ private fun testSDK(): String {
             .rootInvocation(invocation)
             .build()
         Auth.authorizeEntry(entry.toXdrBase64(), signer, validUntilLedgerSeq, network)
-
-        // send real transaction
-        val xdr =
-            server.transactions().limit(1).includeFailed(false).execute().records.get(0).envelopeXdr
-        val tx: Transaction = Transaction.fromEnvelopeXdr(xdr, Network.PUBLIC) as Transaction
-        val resp = server.submitTransaction(tx)
-        Log.d("MainActivity", "testSDK resp: $resp")
         "SUCCESS"
     } catch (e: Exception) {
         Log.e("MainActivity", "testSDK ERROR", e)