diff --git a/contexthub/1.2/default/Android.bp b/contexthub/1.2/default/Android.bp
index 49b54fc..0a31325 100644
--- a/contexthub/1.2/default/Android.bp
+++ b/contexthub/1.2/default/Android.bp
@@ -41,6 +41,7 @@
     ],
     header_libs: [
         "android.hardware.contexthub@1.X-common-impl",
+        "android.hardware.contexthub@1.X-common-utils",
     ],
     vintf_fragments: ["android.hardware.contexthub@1.2.xml"],
 }
diff --git a/contexthub/1.2/default/Contexthub.cpp b/contexthub/1.2/default/Contexthub.cpp
index 8bc028e..db0c5bc 100644
--- a/contexthub/1.2/default/Contexthub.cpp
+++ b/contexthub/1.2/default/Contexthub.cpp
@@ -17,23 +17,47 @@
 
 #include <vector>
 
-using ::android::hardware::contexthub::V1_0::Result;
-
 namespace android {
 namespace hardware {
 namespace contexthub {
 namespace V1_2 {
 namespace implementation {
 
-// TODO(b/166846988): Implement new methods.
-Return<Result> Contexthub::registerCallback_1_2(uint32_t /* hubId */,
-                                                const sp<IContexthubCallback>& /* cb */) {
-    return Result::UNKNOWN_FAILURE;
+using ::android::hardware::contexthub::V1_0::Result;
+using ::android::hardware::contexthub::V1_X::implementation::IContextHubCallbackWrapperV1_0;
+using ::android::hardware::contexthub::V1_X::implementation::IContextHubCallbackWrapperV1_2;
+
+Return<Result> Contexthub::registerCallback(uint32_t hubId,
+                                            const sp<V1_0::IContexthubCallback>& cb) {
+    if (hubId == kMockHubId) {
+        mCallback = new IContextHubCallbackWrapperV1_0(cb);
+        return Result::OK;
+    }
+    return Result::BAD_PARAMS;
 }
 
+Return<Result> Contexthub::queryApps(uint32_t hubId) {
+    if (hubId == kMockHubId && mCallback != nullptr) {
+        std::vector<V1_2::HubAppInfo> nanoapps;
+        mCallback->handleAppsInfo(nanoapps);
+        return Result::OK;
+    }
+    return Result::BAD_PARAMS;
+}
+
+Return<Result> Contexthub::registerCallback_1_2(uint32_t hubId,
+                                                const sp<V1_2::IContexthubCallback>& cb) {
+    if (hubId == kMockHubId) {
+        mCallback = new IContextHubCallbackWrapperV1_2(cb);
+        return Result::OK;
+    }
+    return Result::BAD_PARAMS;
+}
+
+// We don't expose any nanoapps, therefore all nanoapp-related API calls return with BAD_PARAMS
 Return<Result> Contexthub::sendMessageToHub_1_2(uint32_t /* hubId */,
                                                 const ContextHubMsg& /* msg */) {
-    return Result::UNKNOWN_FAILURE;
+    return Result::BAD_PARAMS;
 }
 
 Return<void> Contexthub::onSettingChanged(SettingV1_1 /*setting*/, SettingValue /*newValue*/) {
diff --git a/contexthub/1.2/default/Contexthub.h b/contexthub/1.2/default/Contexthub.h
index c85d3b3..8b89824 100644
--- a/contexthub/1.2/default/Contexthub.h
+++ b/contexthub/1.2/default/Contexthub.h
@@ -16,6 +16,7 @@
 #pragma once
 
 #include "ContextHub.h"
+#include "IContextHubCallbackWrapper.h"
 
 #include <android/hardware/contexthub/1.2/IContexthub.h>
 
@@ -29,20 +30,32 @@
     : public ::android::hardware::contexthub::V1_X::implementation::ContextHub<IContexthub> {
     using ContextHubMsg = ::android::hardware::contexthub::V1_2::ContextHubMsg;
     using IContexthubCallback = ::android::hardware::contexthub::V1_2::IContexthubCallback;
+    using IContextHubCallbackWrapperBase =
+            ::android::hardware::contexthub::V1_X::implementation::IContextHubCallbackWrapperBase;
     using Result = ::android::hardware::contexthub::V1_0::Result;
     using SettingValue = ::android::hardware::contexthub::V1_1::SettingValue;
     using SettingV1_1 = ::android::hardware::contexthub::V1_1::Setting;
 
   public:
-    Return<Result> registerCallback_1_2(uint32_t hubId, const sp<IContexthubCallback>& cb) override;
+    // Methods from V1_0::IContexthub
+    Return<Result> registerCallback(uint32_t hubId,
+                                    const sp<V1_0::IContexthubCallback>& cb) override;
 
-    Return<Result> sendMessageToHub_1_2(uint32_t hubId, const ContextHubMsg& msg) override;
+    Return<Result> queryApps(uint32_t hubId) override;
 
     // Methods from V1_1::IContexthub
     Return<void> onSettingChanged(SettingV1_1 setting, SettingValue newValue) override;
 
     // Methods from V1_2::IContexthub
     Return<void> onSettingChanged_1_2(Setting setting, SettingValue newValue) override;
+
+    Return<Result> registerCallback_1_2(uint32_t hubId,
+                                        const sp<V1_2::IContexthubCallback>& cb) override;
+
+    Return<Result> sendMessageToHub_1_2(uint32_t hubId, const ContextHubMsg& msg) override;
+
+  private:
+    sp<IContextHubCallbackWrapperBase> mCallback;
 };
 
 }  // namespace implementation