diff --git a/service-t/src/com/android/server/connectivity/mdns/MdnsDiscoveryManager.java b/service-t/src/com/android/server/connectivity/mdns/MdnsDiscoveryManager.java
index 05b1dcf..dfaec75 100644
--- a/service-t/src/com/android/server/connectivity/mdns/MdnsDiscoveryManager.java
+++ b/service-t/src/com/android/server/connectivity/mdns/MdnsDiscoveryManager.java
@@ -289,6 +289,6 @@
         return new MdnsServiceTypeClient(
                 serviceType, socketClient,
                 executorProvider.newServiceTypeClientSchedulerExecutor(), socketKey,
-                sharedLog.forSubComponent(tag));
+                sharedLog.forSubComponent(tag), handler.getLooper());
     }
 }
\ No newline at end of file
diff --git a/service-t/src/com/android/server/connectivity/mdns/MdnsServiceTypeClient.java b/service-t/src/com/android/server/connectivity/mdns/MdnsServiceTypeClient.java
index 8d5949c..9c49b8f 100644
--- a/service-t/src/com/android/server/connectivity/mdns/MdnsServiceTypeClient.java
+++ b/service-t/src/com/android/server/connectivity/mdns/MdnsServiceTypeClient.java
@@ -16,10 +16,14 @@
 
 package com.android.server.connectivity.mdns;
 
+import static com.android.server.connectivity.mdns.util.MdnsUtils.ensureRunningOnHandlerThread;
+
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 
 import android.annotation.NonNull;
 import android.annotation.Nullable;
+import android.os.Handler;
+import android.os.Looper;
 import android.text.TextUtils;
 import android.util.ArrayMap;
 import android.util.ArraySet;
@@ -60,6 +64,7 @@
     private final ScheduledExecutorService executor;
     @NonNull private final SocketKey socketKey;
     @NonNull private final SharedLog sharedLog;
+    @NonNull private final Handler handler;
     private final Object lock = new Object();
     private final ArrayMap<MdnsServiceBrowserListener, MdnsSearchOptions> listeners =
             new ArrayMap<>();
@@ -99,9 +104,10 @@
             @NonNull MdnsSocketClientBase socketClient,
             @NonNull ScheduledExecutorService executor,
             @NonNull SocketKey socketKey,
-            @NonNull SharedLog sharedLog) {
+            @NonNull SharedLog sharedLog,
+            @NonNull Looper looper) {
         this(serviceType, socketClient, executor, new MdnsResponseDecoder.Clock(), socketKey,
-                sharedLog);
+                sharedLog, looper);
     }
 
     @VisibleForTesting
@@ -111,7 +117,8 @@
             @NonNull ScheduledExecutorService executor,
             @NonNull MdnsResponseDecoder.Clock clock,
             @NonNull SocketKey socketKey,
-            @NonNull SharedLog sharedLog) {
+            @NonNull SharedLog sharedLog,
+            @NonNull Looper looper) {
         this.serviceType = serviceType;
         this.socketClient = socketClient;
         this.executor = executor;
@@ -120,6 +127,7 @@
         this.clock = clock;
         this.socketKey = socketKey;
         this.sharedLog = sharedLog;
+        this.handler = new Handler(looper);
     }
 
     private static MdnsServiceInfo buildMdnsServiceInfoFromResponse(
@@ -182,6 +190,7 @@
     public void startSendAndReceive(
             @NonNull MdnsServiceBrowserListener listener,
             @NonNull MdnsSearchOptions searchOptions) {
+        ensureRunningOnHandlerThread(handler);
         synchronized (lock) {
             this.searchOptions = searchOptions;
             boolean hadReply = false;
@@ -271,6 +280,7 @@
      * listener}. Otherwise returns {@code false}.
      */
     public boolean stopSendAndReceive(@NonNull MdnsServiceBrowserListener listener) {
+        ensureRunningOnHandlerThread(handler);
         synchronized (lock) {
             if (listeners.remove(listener) == null) {
                 return listeners.isEmpty();
@@ -282,15 +292,12 @@
         }
     }
 
-    public String[] getServiceTypeLabels() {
-        return serviceTypeLabels;
-    }
-
     /**
      * Process an incoming response packet.
      */
     public synchronized void processResponse(@NonNull MdnsPacket packet,
             @NonNull SocketKey socketKey) {
+        ensureRunningOnHandlerThread(handler);
         synchronized (lock) {
             // Augment the list of current known responses, and generated responses for resolve
             // requests if there is no known response
@@ -340,6 +347,7 @@
     }
 
     public synchronized void onFailedToParseMdnsResponse(int receivedPacketNumber, int errorCode) {
+        ensureRunningOnHandlerThread(handler);
         for (int i = 0; i < listeners.size(); i++) {
             listeners.keyAt(i).onFailedToParseMdnsResponse(receivedPacketNumber, errorCode);
         }
@@ -347,6 +355,7 @@
 
     /** Notify all services are removed because the socket is destroyed. */
     public void notifySocketDestroyed() {
+        ensureRunningOnHandlerThread(handler);
         synchronized (lock) {
             for (MdnsResponse response : instanceNameToResponse.values()) {
                 final String name = response.getServiceInstanceName();
diff --git a/tests/unit/java/com/android/server/connectivity/mdns/MdnsServiceTypeClientTests.java b/tests/unit/java/com/android/server/connectivity/mdns/MdnsServiceTypeClientTests.java
index 0a299bf..cf6275f 100644
--- a/tests/unit/java/com/android/server/connectivity/mdns/MdnsServiceTypeClientTests.java
+++ b/tests/unit/java/com/android/server/connectivity/mdns/MdnsServiceTypeClientTests.java
@@ -41,6 +41,8 @@
 import android.annotation.Nullable;
 import android.net.InetAddresses;
 import android.net.Network;
+import android.os.Handler;
+import android.os.HandlerThread;
 import android.text.TextUtils;
 
 import com.android.net.module.util.CollectionUtils;
@@ -49,7 +51,9 @@
 import com.android.server.connectivity.mdns.MdnsServiceTypeClient.QueryTaskConfig;
 import com.android.testutils.DevSdkIgnoreRule;
 import com.android.testutils.DevSdkIgnoreRunner;
+import com.android.testutils.HandlerUtils;
 
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Ignore;
 import org.junit.Test;
@@ -82,6 +86,7 @@
 @DevSdkIgnoreRule.IgnoreUpTo(SC_V2)
 public class MdnsServiceTypeClientTests {
     private static final int INTERFACE_INDEX = 999;
+    private static final long DEFAULT_TIMEOUT = 2000L;
     private static final String SERVICE_TYPE = "_googlecast._tcp.local";
     private static final String[] SERVICE_TYPE_LABELS = TextUtils.split(SERVICE_TYPE, "\\.");
     private static final InetSocketAddress IPV4_ADDRESS = new InetSocketAddress(
@@ -119,6 +124,8 @@
 
     private MdnsServiceTypeClient client;
     private SocketKey socketKey;
+    private HandlerThread thread;
+    private Handler handler;
 
     @Before
     @SuppressWarnings("DoNotMock")
@@ -174,9 +181,12 @@
                 .thenReturn(expectedIPv6Packets[14])
                 .thenReturn(expectedIPv6Packets[15]);
 
+        thread = new HandlerThread("MdnsServiceTypeClientTests");
+        thread.start();
+        handler = new Handler(thread.getLooper());
         client =
                 new MdnsServiceTypeClient(SERVICE_TYPE, mockSocketClient, currentThreadExecutor,
-                        mockDecoderClock, socketKey, mockSharedLog) {
+                        mockDecoderClock, socketKey, mockSharedLog, thread.getLooper()) {
                     @Override
                     MdnsPacketWriter createMdnsPacketWriter() {
                         return mockPacketWriter;
@@ -184,11 +194,40 @@
                 };
     }
 
+    @After
+    public void tearDown() {
+        if (thread != null) {
+            thread.quitSafely();
+        }
+    }
+
+    private void runOnHandler(Runnable r) {
+        handler.post(r);
+        HandlerUtils.waitForIdle(handler, DEFAULT_TIMEOUT);
+    }
+
+    private void startSendAndReceive(MdnsServiceBrowserListener listener,
+            MdnsSearchOptions searchOptions) {
+        runOnHandler(() -> client.startSendAndReceive(listener, searchOptions));
+    }
+
+    private void processResponse(MdnsPacket packet, SocketKey socketKey) {
+        runOnHandler(() -> client.processResponse(packet, socketKey));
+    }
+
+    private void stopSendAndReceive(MdnsServiceBrowserListener listener) {
+        runOnHandler(() -> client.stopSendAndReceive(listener));
+    }
+
+    private void notifySocketDestroyed() {
+        runOnHandler(() -> client.notifySocketDestroyed());
+    }
+
     @Test
     public void sendQueries_activeScanMode() {
         MdnsSearchOptions searchOptions =
                 MdnsSearchOptions.newBuilder().addSubtype("12345").setIsPassiveMode(false).build();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
 
         // First burst, 3 queries.
         verifyAndSendQuery(0, 0, /* expectsUnicastResponse= */ true);
@@ -228,7 +267,7 @@
                 14, MdnsConfigs.timeBetweenQueriesInBurstMs(), /* expectsUnicastResponse= */ false);
 
         // Stop sending packets.
-        client.stopSendAndReceive(mockListenerOne);
+        stopSendAndReceive(mockListenerOne);
         verify(expectedSendFutures[15]).cancel(true);
     }
 
@@ -236,7 +275,7 @@
     public void sendQueries_reentry_activeScanMode() {
         MdnsSearchOptions searchOptions =
                 MdnsSearchOptions.newBuilder().addSubtype("12345").setIsPassiveMode(false).build();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
 
         // First burst, first query is sent.
         verifyAndSendQuery(0, 0, /* expectsUnicastResponse= */ true);
@@ -248,7 +287,7 @@
                         .addSubtype("abcde")
                         .setIsPassiveMode(false)
                         .build();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
         // The previous scheduled task should be canceled.
         verify(expectedSendFutures[1]).cancel(true);
 
@@ -260,7 +299,7 @@
                 3, MdnsConfigs.timeBetweenQueriesInBurstMs(), /* expectsUnicastResponse= */ false);
 
         // Stop sending packets.
-        client.stopSendAndReceive(mockListenerOne);
+        stopSendAndReceive(mockListenerOne);
         verify(expectedSendFutures[5]).cancel(true);
     }
 
@@ -268,7 +307,7 @@
     public void sendQueries_passiveScanMode() {
         MdnsSearchOptions searchOptions =
                 MdnsSearchOptions.newBuilder().addSubtype("12345").setIsPassiveMode(true).build();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
 
         // First burst, 3 query.
         verifyAndSendQuery(0, 0, /* expectsUnicastResponse= */ true);
@@ -284,7 +323,7 @@
                 false);
 
         // Stop sending packets.
-        client.stopSendAndReceive(mockListenerOne);
+        stopSendAndReceive(mockListenerOne);
         verify(expectedSendFutures[5]).cancel(true);
     }
 
@@ -293,7 +332,7 @@
         MdnsSearchOptions searchOptions =
                 MdnsSearchOptions.newBuilder().addSubtype("12345").setIsPassiveMode(
                         false).setNumOfQueriesBeforeBackoff(11).build();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
 
         // First burst, 3 queries.
         verifyAndSendQuery(0, 0, /* expectsUnicastResponse= */ true);
@@ -328,7 +367,7 @@
         // 0.8 * smallestRemainingTtl is larger than time to next run.
         long currentTime = TEST_TTL / 2 + TEST_ELAPSED_REALTIME;
         doReturn(currentTime).when(mockDecoderClock).elapsedRealtime();
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 "service-instance-1", "192.0.2.123", 5353,
                 SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), TEST_TTL), socketKey);
@@ -345,7 +384,7 @@
         MdnsSearchOptions searchOptions =
                 MdnsSearchOptions.newBuilder().addSubtype("12345").setIsPassiveMode(
                         true).setNumOfQueriesBeforeBackoff(3).build();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
         verifyAndSendQuery(0, 0, /* expectsUnicastResponse= */ true);
         verifyAndSendQuery(
                 1, MdnsConfigs.timeBetweenQueriesInBurstMs(), /* expectsUnicastResponse= */ false);
@@ -358,7 +397,7 @@
         // In backoff mode, the current scheduled task will be canceled and reschedule if the
         // 0.8 * smallestRemainingTtl is larger than time to next run.
         doReturn(TEST_ELAPSED_REALTIME + 20000).when(mockDecoderClock).elapsedRealtime();
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 "service-instance-1", "192.0.2.123", 5353,
                 SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), TEST_TTL), socketKey);
@@ -372,7 +411,7 @@
 
         // If the records is not refreshed, the current scheduled task will not be canceled.
         doReturn(TEST_ELAPSED_REALTIME + 20001).when(mockDecoderClock).elapsedRealtime();
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 "service-instance-1", "192.0.2.123", 5353,
                 SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), TEST_TTL,
@@ -382,13 +421,13 @@
         // In backoff mode, the current scheduled task will not be canceled if the
         // 0.8 * smallestRemainingTtl is smaller than time to next run.
         doReturn(TEST_ELAPSED_REALTIME).when(mockDecoderClock).elapsedRealtime();
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 "service-instance-1", "192.0.2.123", 5353,
                 SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), TEST_TTL), socketKey);
         verify(expectedSendFutures[7], never()).cancel(true);
 
-        client.stopSendAndReceive(mockListenerOne);
+        stopSendAndReceive(mockListenerOne);
         verify(expectedSendFutures[7]).cancel(true);
     }
 
@@ -396,7 +435,7 @@
     public void sendQueries_reentry_passiveScanMode() {
         MdnsSearchOptions searchOptions =
                 MdnsSearchOptions.newBuilder().addSubtype("12345").setIsPassiveMode(true).build();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
 
         // First burst, first query is sent.
         verifyAndSendQuery(0, 0, /* expectsUnicastResponse= */ true);
@@ -408,7 +447,7 @@
                         .addSubtype("abcde")
                         .setIsPassiveMode(true)
                         .build();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
         // The previous scheduled task should be canceled.
         verify(expectedSendFutures[1]).cancel(true);
 
@@ -420,7 +459,7 @@
                 3, MdnsConfigs.timeBetweenQueriesInBurstMs(), /* expectsUnicastResponse= */ false);
 
         // Stop sending packets.
-        client.stopSendAndReceive(mockListenerOne);
+        stopSendAndReceive(mockListenerOne);
         verify(expectedSendFutures[5]).cancel(true);
     }
 
@@ -492,7 +531,7 @@
     public void testIfPreviousTaskIsCanceledWhenNewSessionStarts() {
         MdnsSearchOptions searchOptions =
                 MdnsSearchOptions.newBuilder().addSubtype("12345").setIsPassiveMode(true).build();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
         Runnable firstMdnsTask = currentThreadExecutor.getAndClearSubmittedRunnable();
 
         // Change the sutypes and start a new session.
@@ -502,7 +541,7 @@
                         .addSubtype("abcde")
                         .setIsPassiveMode(true)
                         .build();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
 
         // Clear the scheduled runnable.
         currentThreadExecutor.getAndClearLastScheduledRunnable();
@@ -521,9 +560,9 @@
         //MdnsConfigsFlagsImpl.shouldCancelScanTaskWhenFutureIsNull.override(true);
         MdnsSearchOptions searchOptions =
                 MdnsSearchOptions.newBuilder().addSubtype("12345").setIsPassiveMode(true).build();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
         // Change the sutypes and start a new session.
-        client.stopSendAndReceive(mockListenerOne);
+        stopSendAndReceive(mockListenerOne);
         // Clear the scheduled runnable.
         currentThreadExecutor.getAndClearLastScheduledRunnable();
 
@@ -538,10 +577,10 @@
     @Test
     public void testQueryScheduledWhenAnsweredFromCache() {
         final MdnsSearchOptions searchOptions = MdnsSearchOptions.getDefaultOptions();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
         assertNotNull(currentThreadExecutor.getAndClearSubmittedRunnable());
 
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 "service-instance-1", "192.0.2.123", 5353,
                 SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), TEST_TTL), socketKey);
@@ -550,7 +589,7 @@
         verify(mockListenerOne).onServiceFound(any());
 
         // File another identical query
-        client.startSendAndReceive(mockListenerTwo, searchOptions);
+        startSendAndReceive(mockListenerTwo, searchOptions);
 
         verify(mockListenerTwo).onServiceNameDiscovered(any());
         verify(mockListenerTwo).onServiceFound(any());
@@ -582,9 +621,9 @@
 
     @Test
     public void processResponse_incompleteResponse() {
-        client.startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
+        startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
 
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 "service-instance-1", null /* host */, 0 /* port */,
                 SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), TEST_TTL), socketKey);
@@ -606,16 +645,16 @@
     @Test
     public void processIPv4Response_completeResponseForNewServiceInstance() throws Exception {
         final String ipV4Address = "192.168.1.1";
-        client.startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
+        startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
 
         // Process the initial response.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 "service-instance-1", ipV4Address, 5353,
                 /* subtype= */ "ABCDE",
                 Collections.emptyMap(), TEST_TTL), socketKey);
 
         // Process a second response with a different port and updated text attributes.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                         "service-instance-1", ipV4Address, 5354,
                         /* subtype= */ "ABCDE",
                         Collections.singletonMap("key", "value"), TEST_TTL),
@@ -660,16 +699,16 @@
     @Test
     public void processIPv6Response_getCorrectServiceInfo() throws Exception {
         final String ipV6Address = "2000:3333::da6c:63ff:fe7c:7483";
-        client.startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
+        startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
 
         // Process the initial response.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 "service-instance-1", ipV6Address, 5353,
                 /* subtype= */ "ABCDE",
                 Collections.emptyMap(), TEST_TTL), socketKey);
 
         // Process a second response with a different port and updated text attributes.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                         "service-instance-1", ipV6Address, 5354,
                         /* subtype= */ "ABCDE",
                         Collections.singletonMap("key", "value"), TEST_TTL),
@@ -732,18 +771,18 @@
 
     @Test
     public void processResponse_goodBye() throws Exception {
-        client.startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
-        client.startSendAndReceive(mockListenerTwo, MdnsSearchOptions.getDefaultOptions());
+        startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
+        startSendAndReceive(mockListenerTwo, MdnsSearchOptions.getDefaultOptions());
 
         final String serviceName = "service-instance-1";
         final String ipV6Address = "2000:3333::da6c:63ff:fe7c:7483";
         // Process the initial response.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 serviceName, ipV6Address, 5353,
                 SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), TEST_TTL), socketKey);
 
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 "goodbye-service", ipV6Address, 5353,
                 SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), /* ptrTtlMillis= */ 0L), socketKey);
@@ -753,7 +792,7 @@
         verifyServiceRemovedNoCallback(mockListenerTwo);
 
         // Verify removed callback would be called.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 serviceName, ipV6Address, 5353,
                 SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), 0L), socketKey);
@@ -766,12 +805,12 @@
     @Test
     public void reportExistingServiceToNewlyRegisteredListeners() throws Exception {
         // Process the initial response.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 "service-instance-1", "192.168.1.1", 5353,
                 /* subtype= */ "ABCDE",
                 Collections.emptyMap(), TEST_TTL), socketKey);
 
-        client.startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
+        startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
 
         // Verify onServiceNameDiscovered was called once for the existing response.
         verify(mockListenerOne).onServiceNameDiscovered(serviceInfoCaptor.capture());
@@ -795,12 +834,12 @@
         assertNull(existingServiceInfo.getAttributeByKey("key"));
 
         // Process a goodbye message for the existing response.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 "service-instance-1", "192.168.1.1", 5353,
                 SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), /* ptrTtlMillis= */ 0L), socketKey);
 
-        client.startSendAndReceive(mockListenerTwo, MdnsSearchOptions.getDefaultOptions());
+        startSendAndReceive(mockListenerTwo, MdnsSearchOptions.getDefaultOptions());
 
         // Verify onServiceFound was not called on the newly registered listener after the existing
         // response is gone.
@@ -814,7 +853,7 @@
         final String serviceInstanceName = "service-instance-1";
         client =
                 new MdnsServiceTypeClient(SERVICE_TYPE, mockSocketClient, currentThreadExecutor,
-                        mockDecoderClock, socketKey, mockSharedLog) {
+                        mockDecoderClock, socketKey, mockSharedLog, thread.getLooper()) {
                     @Override
                     MdnsPacketWriter createMdnsPacketWriter() {
                         return mockPacketWriter;
@@ -824,11 +863,11 @@
                 .setRemoveExpiredService(true)
                 .setNumOfQueriesBeforeBackoff(Integer.MAX_VALUE)
                 .build();
-        client.startSendAndReceive(mockListenerOne, searchOptions);
+        startSendAndReceive(mockListenerOne, searchOptions);
         Runnable firstMdnsTask = currentThreadExecutor.getAndClearSubmittedRunnable();
 
         // Process the initial response.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 serviceInstanceName, "192.168.1.1", 5353, /* subtype= */ "ABCDE",
                 Collections.emptyMap(), TEST_TTL), socketKey);
 
@@ -857,17 +896,17 @@
         final String serviceInstanceName = "service-instance-1";
         client =
                 new MdnsServiceTypeClient(SERVICE_TYPE, mockSocketClient, currentThreadExecutor,
-                        mockDecoderClock, socketKey, mockSharedLog) {
+                        mockDecoderClock, socketKey, mockSharedLog, thread.getLooper()) {
                     @Override
                     MdnsPacketWriter createMdnsPacketWriter() {
                         return mockPacketWriter;
                     }
                 };
-        client.startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
+        startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
         Runnable firstMdnsTask = currentThreadExecutor.getAndClearSubmittedRunnable();
 
         // Process the initial response.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 serviceInstanceName, "192.168.1.1", 5353, /* subtype= */ "ABCDE",
                 Collections.emptyMap(), TEST_TTL), socketKey);
 
@@ -890,17 +929,17 @@
         final String serviceInstanceName = "service-instance-1";
         client =
                 new MdnsServiceTypeClient(SERVICE_TYPE, mockSocketClient, currentThreadExecutor,
-                        mockDecoderClock, socketKey, mockSharedLog) {
+                        mockDecoderClock, socketKey, mockSharedLog, thread.getLooper()) {
                     @Override
                     MdnsPacketWriter createMdnsPacketWriter() {
                         return mockPacketWriter;
                     }
                 };
-        client.startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
+        startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
         Runnable firstMdnsTask = currentThreadExecutor.getAndClearSubmittedRunnable();
 
         // Process the initial response.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 serviceInstanceName, "192.168.1.1", 5353, /* subtype= */ "ABCDE",
                 Collections.emptyMap(), TEST_TTL), socketKey);
 
@@ -921,27 +960,27 @@
         final String serviceName = "service-instance";
         final String ipV4Address = "192.0.2.0";
         final String ipV6Address = "2001:db8::";
-        client.startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
+        startSendAndReceive(mockListenerOne, MdnsSearchOptions.getDefaultOptions());
         InOrder inOrder = inOrder(mockListenerOne);
 
         // Process the initial response which is incomplete.
         final String subtype = "ABCDE";
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 serviceName, null, 5353, subtype,
                 Collections.emptyMap(), TEST_TTL), socketKey);
 
         // Process a second response which has ip address to make response become complete.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 serviceName, ipV4Address, 5353, subtype,
                 Collections.emptyMap(), TEST_TTL), socketKey);
 
         // Process a third response with a different ip address, port and updated text attributes.
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 serviceName, ipV6Address, 5354, subtype,
                 Collections.singletonMap("key", "value"), TEST_TTL), socketKey);
 
         // Process the last response which is goodbye message (with the main type, not subtype).
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                         serviceName, ipV6Address, 5354, SERVICE_TYPE_LABELS,
                         Collections.singletonMap("key", "value"), /* ptrTtlMillis= */ 0L),
                 socketKey);
@@ -1009,8 +1048,8 @@
 
     @Test
     public void testProcessResponse_Resolve() throws Exception {
-        client = new MdnsServiceTypeClient(
-                SERVICE_TYPE, mockSocketClient, currentThreadExecutor, socketKey, mockSharedLog);
+        client = new MdnsServiceTypeClient(SERVICE_TYPE, mockSocketClient, currentThreadExecutor,
+                socketKey, mockSharedLog, thread.getLooper());
 
         final String instanceName = "service-instance";
         final String[] hostname = new String[] { "testhost "};
@@ -1020,7 +1059,7 @@
         final MdnsSearchOptions resolveOptions = MdnsSearchOptions.newBuilder()
                 .setResolveInstanceName(instanceName).build();
 
-        client.startSendAndReceive(mockListenerOne, resolveOptions);
+        startSendAndReceive(mockListenerOne, resolveOptions);
         InOrder inOrder = inOrder(mockListenerOne, mockSocketClient);
 
         // Verify a query for SRV/TXT was sent, but no PTR query
@@ -1053,7 +1092,7 @@
                 Collections.emptyList() /* authorityRecords */,
                 Collections.emptyList() /* additionalRecords */);
 
-        client.processResponse(srvTxtResponse, socketKey);
+        processResponse(srvTxtResponse, socketKey);
 
         // Expect a query for A/AAAA
         final ArgumentCaptor<DatagramPacket> addressQueryCaptor =
@@ -1083,7 +1122,7 @@
                 Collections.emptyList() /* additionalRecords */);
 
         inOrder.verify(mockListenerOne, never()).onServiceNameDiscovered(any());
-        client.processResponse(addressResponse, socketKey);
+        processResponse(addressResponse, socketKey);
 
         inOrder.verify(mockListenerOne).onServiceFound(serviceInfoCaptor.capture());
         verifyServiceInfo(serviceInfoCaptor.getValue(),
@@ -1100,7 +1139,7 @@
     @Test
     public void testRenewTxtSrvInResolve() throws Exception {
         client = new MdnsServiceTypeClient(SERVICE_TYPE, mockSocketClient, currentThreadExecutor,
-                mockDecoderClock, socketKey, mockSharedLog);
+                mockDecoderClock, socketKey, mockSharedLog, thread.getLooper());
 
         final String instanceName = "service-instance";
         final String[] hostname = new String[] { "testhost "};
@@ -1110,7 +1149,7 @@
         final MdnsSearchOptions resolveOptions = MdnsSearchOptions.newBuilder()
                 .setResolveInstanceName(instanceName).build();
 
-        client.startSendAndReceive(mockListenerOne, resolveOptions);
+        startSendAndReceive(mockListenerOne, resolveOptions);
         InOrder inOrder = inOrder(mockListenerOne, mockSocketClient);
 
         // Get the query for SRV/TXT
@@ -1147,7 +1186,7 @@
                                 InetAddresses.parseNumericAddress(ipV6Address))),
                 Collections.emptyList() /* authorityRecords */,
                 Collections.emptyList() /* additionalRecords */);
-        client.processResponse(srvTxtResponse, socketKey);
+        processResponse(srvTxtResponse, socketKey);
         inOrder.verify(mockListenerOne).onServiceNameDiscovered(any());
         inOrder.verify(mockListenerOne).onServiceFound(any());
 
@@ -1192,7 +1231,7 @@
                                 InetAddresses.parseNumericAddress(ipV6Address))),
                 Collections.emptyList() /* authorityRecords */,
                 Collections.emptyList() /* additionalRecords */);
-        client.processResponse(refreshedSrvTxtResponse, socketKey);
+        processResponse(refreshedSrvTxtResponse, socketKey);
 
         // Advance time to updatedReceiptTime + 1, expected no refresh query because the cache
         // should contain the record that have update last receipt time.
@@ -1203,8 +1242,8 @@
 
     @Test
     public void testProcessResponse_ResolveExcludesOtherServices() {
-        client = new MdnsServiceTypeClient(
-                SERVICE_TYPE, mockSocketClient, currentThreadExecutor, socketKey, mockSharedLog);
+        client = new MdnsServiceTypeClient(SERVICE_TYPE, mockSocketClient, currentThreadExecutor,
+                socketKey, mockSharedLog, thread.getLooper());
 
         final String requestedInstance = "instance1";
         final String otherInstance = "instance2";
@@ -1216,28 +1255,28 @@
                 // Use different case in the options
                 .setResolveInstanceName(capitalizedRequestInstance).build();
 
-        client.startSendAndReceive(mockListenerOne, resolveOptions);
-        client.startSendAndReceive(mockListenerTwo, MdnsSearchOptions.getDefaultOptions());
+        startSendAndReceive(mockListenerOne, resolveOptions);
+        startSendAndReceive(mockListenerTwo, MdnsSearchOptions.getDefaultOptions());
 
         // Complete response from instanceName
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                         requestedInstance, ipV4Address, 5353, SERVICE_TYPE_LABELS,
                         Collections.emptyMap() /* textAttributes */, TEST_TTL),
                 socketKey);
 
         // Complete response from otherInstanceName
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                         otherInstance, ipV4Address, 5353, SERVICE_TYPE_LABELS,
                         Collections.emptyMap() /* textAttributes */, TEST_TTL),
                 socketKey);
 
         // Address update from otherInstanceName
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 otherInstance, ipV6Address, 5353, SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), TEST_TTL), socketKey);
 
         // Goodbye from otherInstanceName
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 otherInstance, ipV6Address, 5353, SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), 0L /* ttl */), socketKey);
 
@@ -1267,8 +1306,8 @@
 
     @Test
     public void testProcessResponse_SubtypeDiscoveryLimitedToSubtype() {
-        client = new MdnsServiceTypeClient(
-                SERVICE_TYPE, mockSocketClient, currentThreadExecutor, socketKey, mockSharedLog);
+        client = new MdnsServiceTypeClient(SERVICE_TYPE, mockSocketClient, currentThreadExecutor,
+                socketKey, mockSharedLog, thread.getLooper());
 
         final String matchingInstance = "instance1";
         final String subtype = "_subtype";
@@ -1280,8 +1319,8 @@
                 // Search with different case. Note MdnsSearchOptions subtype doesn't start with "_"
                 .addSubtype("Subtype").build();
 
-        client.startSendAndReceive(mockListenerOne, options);
-        client.startSendAndReceive(mockListenerTwo, MdnsSearchOptions.getDefaultOptions());
+        startSendAndReceive(mockListenerOne, options);
+        startSendAndReceive(mockListenerTwo, MdnsSearchOptions.getDefaultOptions());
 
         // Complete response from instanceName
         final MdnsPacket packetWithoutSubtype = createResponse(
@@ -1304,21 +1343,21 @@
                 newAnswers,
                 packetWithoutSubtype.authorityRecords,
                 packetWithoutSubtype.additionalRecords);
-        client.processResponse(packetWithSubtype, socketKey);
+        processResponse(packetWithSubtype, socketKey);
 
         // Complete response from otherInstanceName, without subtype
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                         otherInstance, ipV4Address, 5353, SERVICE_TYPE_LABELS,
                         Collections.emptyMap() /* textAttributes */, TEST_TTL),
                 socketKey);
 
         // Address update from otherInstanceName
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 otherInstance, ipV6Address, 5353, SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), TEST_TTL), socketKey);
 
         // Goodbye from otherInstanceName
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                 otherInstance, ipV6Address, 5353, SERVICE_TYPE_LABELS,
                 Collections.emptyMap(), 0L /* ttl */), socketKey);
 
@@ -1348,8 +1387,8 @@
 
     @Test
     public void testNotifySocketDestroyed() throws Exception {
-        client = new MdnsServiceTypeClient(
-                SERVICE_TYPE, mockSocketClient, currentThreadExecutor, socketKey, mockSharedLog);
+        client = new MdnsServiceTypeClient(SERVICE_TYPE, mockSocketClient, currentThreadExecutor,
+                socketKey, mockSharedLog, thread.getLooper());
 
         final String requestedInstance = "instance1";
         final String otherInstance = "instance2";
@@ -1359,11 +1398,11 @@
                 .setNumOfQueriesBeforeBackoff(Integer.MAX_VALUE)
                 .setResolveInstanceName("instance1").build();
 
-        client.startSendAndReceive(mockListenerOne, resolveOptions);
+        startSendAndReceive(mockListenerOne, resolveOptions);
         // Ensure the first task is executed so it schedules a future task
         currentThreadExecutor.getAndClearSubmittedFuture().get(
                 TEST_TIMEOUT_MS, TimeUnit.MILLISECONDS);
-        client.startSendAndReceive(mockListenerTwo,
+        startSendAndReceive(mockListenerTwo,
                 MdnsSearchOptions.newBuilder().setNumOfQueriesBeforeBackoff(
                         Integer.MAX_VALUE).build());
 
@@ -1375,19 +1414,19 @@
                 TEST_TIMEOUT_MS, TimeUnit.MILLISECONDS);
 
         // Complete response from instanceName
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                         requestedInstance, ipV4Address, 5353, SERVICE_TYPE_LABELS,
                         Collections.emptyMap() /* textAttributes */, TEST_TTL),
                 socketKey);
 
         // Complete response from otherInstanceName
-        client.processResponse(createResponse(
+        processResponse(createResponse(
                         otherInstance, ipV4Address, 5353, SERVICE_TYPE_LABELS,
                         Collections.emptyMap() /* textAttributes */, TEST_TTL),
                 socketKey);
 
         verify(expectedSendFutures[1], never()).cancel(true);
-        client.notifySocketDestroyed();
+        notifySocketDestroyed();
         verify(expectedSendFutures[1]).cancel(true);
 
         // mockListenerOne gets notified for the requested instance