diff --git a/quickstep/tests/src/com/android/quickstep/NavigationModeSwitchRule.java b/quickstep/tests/src/com/android/quickstep/NavigationModeSwitchRule.java
index 0afe4a8..40265c4 100644
--- a/quickstep/tests/src/com/android/quickstep/NavigationModeSwitchRule.java
+++ b/quickstep/tests/src/com/android/quickstep/NavigationModeSwitchRule.java
@@ -203,7 +203,7 @@
                         + launcher.getNavigationModeMismatchError(),
                 () -> launcher.getNavigationModeMismatchError() == null,
                 60000 /* b/148422894 */, launcher);
-        AbstractLauncherUiTest.checkDetectedLeaks();
+        AbstractLauncherUiTest.checkDetectedLeaks(launcher);
         return true;
     }
 
diff --git a/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java b/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
index 0ba5a36..9c8e278 100644
--- a/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
+++ b/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
@@ -98,9 +98,10 @@
     public static final long DEFAULT_UI_TIMEOUT = 10000;
     private static final String TAG = "AbstractLauncherUiTest";
 
-    private static String sDetectedActivityLeak;
+    private static String sStrictmodeDetectedActivityLeak;
     private static boolean sActivityLeakReported;
     private static final String SYSTEMUI_PACKAGE = "com.android.systemui";
+    private static final ActivityLeakTracker ACTIVITY_LEAK_TRACKER = new ActivityLeakTracker();
 
     protected LooperExecutor mMainThreadExecutor = MAIN_EXECUTOR;
     protected final UiDevice mDevice = UiDevice.getInstance(getInstrumentation());
@@ -113,30 +114,51 @@
         if (TestHelpers.isInLauncherProcess()) {
             StrictMode.VmPolicy.Builder builder =
                     new StrictMode.VmPolicy.Builder()
-                            .detectActivityLeaks()
+// b/154772063
+//                            .detectActivityLeaks()
                             .penaltyLog()
                             .penaltyListener(Runnable::run, violation -> {
-                                // Runs in the main thread. We can't dumpheap in the main thread,
-                                // so let's just mark the fact that the leak has happened.
-                                if (sDetectedActivityLeak == null) {
-                                    sDetectedActivityLeak = violation.toString();
-                                    try {
-                                        Debug.dumpHprofData(
-                                                getInstrumentation().getTargetContext()
-                                                        .getFilesDir().getPath()
-                                                        + "/ActivityLeakHeapDump.hprof");
-                                    } catch (Throwable e) {
-                                        Log.e(TAG, "dumpHprofData failed", e);
-                                    }
+                                if (sStrictmodeDetectedActivityLeak == null) {
+                                    sStrictmodeDetectedActivityLeak = violation.toString() + ", "
+                                            + dumpHprofData() + ".";
                                 }
                             });
             StrictMode.setVmPolicy(builder.build());
         }
     }
 
-    public static void checkDetectedLeaks() {
-        if (sDetectedActivityLeak != null && !sActivityLeakReported) {
+    public static void checkDetectedLeaks(LauncherInstrumentation launcher) {
+        if (sActivityLeakReported) return;
+
+        if (sStrictmodeDetectedActivityLeak != null) {
+            // Report from the test thread strictmode violations detected in the main thread.
             sActivityLeakReported = true;
+            Assert.fail(sStrictmodeDetectedActivityLeak);
+        }
+
+        // Check whether activity leak detector has found leaked activities.
+        Wait.atMost(AbstractLauncherUiTest::getActivityLeakErrorMessage,
+                () -> {
+                    launcher.getTotalPssKb();  // Triggers GC
+                    return MAIN_EXECUTOR.submit(
+                            () -> ACTIVITY_LEAK_TRACKER.noLeakedActivities()).get();
+                }, DEFAULT_UI_TIMEOUT, launcher);
+    }
+
+    private static String getActivityLeakErrorMessage() {
+        sActivityLeakReported = true;
+        return "Activity leak detector has found leaked activities, " + dumpHprofData() + ".";
+    }
+
+    private static String dumpHprofData() {
+        try {
+            final String fileName = getInstrumentation().getTargetContext().getFilesDir().getPath()
+                    + "/ActivityLeakHeapDump.hprof";
+            Debug.dumpHprofData(fileName);
+            return "memory dump filename: " + fileName;
+        } catch (Throwable e) {
+            Log.e(TAG, "dumpHprofData failed", e);
+            return "failed to save memory dump";
         }
     }
 
@@ -263,7 +285,7 @@
         if (mLauncherPid != 0) {
             assertEquals("Launcher crashed, pid mismatch:", mLauncherPid, mLauncher.getPid());
         }
-        checkDetectedLeaks();
+        checkDetectedLeaks(mLauncher);
     }
 
     protected void clearLauncherData() throws IOException, InterruptedException {
diff --git a/tests/src/com/android/launcher3/ui/ActivityLeakTracker.java b/tests/src/com/android/launcher3/ui/ActivityLeakTracker.java
new file mode 100644
index 0000000..0b5ce02
--- /dev/null
+++ b/tests/src/com/android/launcher3/ui/ActivityLeakTracker.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3.ui;
+
+import android.app.Activity;
+import android.app.Application;
+import android.os.Bundle;
+
+import androidx.test.InstrumentationRegistry;
+
+import com.android.launcher3.tapl.TestHelpers;
+
+import java.util.WeakHashMap;
+
+class ActivityLeakTracker implements Application.ActivityLifecycleCallbacks {
+    private final WeakHashMap<Activity, Boolean> mActivities = new WeakHashMap<>();
+
+    ActivityLeakTracker() {
+        if (!TestHelpers.isInLauncherProcess()) return;
+        final Application app =
+                (Application) InstrumentationRegistry.getTargetContext().getApplicationContext();
+        app.registerActivityLifecycleCallbacks(this);
+    }
+
+    @Override
+    public void onActivityCreated(Activity activity, Bundle bundle) {
+        mActivities.put(activity, true);
+    }
+
+    @Override
+    public void onActivityStarted(Activity activity) {
+    }
+
+    @Override
+    public void onActivityResumed(Activity activity) {
+    }
+
+    @Override
+    public void onActivityPaused(Activity activity) {
+    }
+
+    @Override
+    public void onActivityStopped(Activity activity) {
+    }
+
+    @Override
+    public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {
+    }
+
+    @Override
+    public void onActivityDestroyed(Activity activity) {
+    }
+
+    public boolean noLeakedActivities() {
+        int liveActivities = 0;
+        int destroyedActivities = 0;
+
+        for (Activity activity : mActivities.keySet()) {
+            if (activity.isDestroyed()) {
+                ++destroyedActivities;
+            } else {
+                ++liveActivities;
+            }
+        }
+
+        // It's OK to have 1 leaked activity if no active activities exist.
+        return liveActivities == 0 ? destroyedActivities <= 1 : destroyedActivities == 0;
+    }
+}
diff --git a/tests/src/com/android/launcher3/ui/PortraitLandscapeRunner.java b/tests/src/com/android/launcher3/ui/PortraitLandscapeRunner.java
index 38f50c1..266f0ae 100644
--- a/tests/src/com/android/launcher3/ui/PortraitLandscapeRunner.java
+++ b/tests/src/com/android/launcher3/ui/PortraitLandscapeRunner.java
@@ -56,7 +56,7 @@
             private void evaluateInPortrait() throws Throwable {
                 mTest.mDevice.setOrientationNatural();
                 mTest.mLauncher.setExpectedRotation(Surface.ROTATION_0);
-                AbstractLauncherUiTest.checkDetectedLeaks();
+                AbstractLauncherUiTest.checkDetectedLeaks(mTest.mLauncher);
                 base.evaluate();
                 mTest.getDevice().pressHome();
             }
@@ -64,7 +64,7 @@
             private void evaluateInLandscape() throws Throwable {
                 mTest.mDevice.setOrientationLeft();
                 mTest.mLauncher.setExpectedRotation(Surface.ROTATION_90);
-                AbstractLauncherUiTest.checkDetectedLeaks();
+                AbstractLauncherUiTest.checkDetectedLeaks(mTest.mLauncher);
                 base.evaluate();
                 mTest.getDevice().pressHome();
             }
diff --git a/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java b/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
index 57000a0..34e425d 100644
--- a/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
+++ b/tests/src/com/android/launcher3/ui/TaplTestsLauncher3.java
@@ -64,7 +64,7 @@
         test.waitForResumed("Launcher internal state is still Background");
         // Check that we switched to home.
         test.mLauncher.getWorkspace();
-        AbstractLauncherUiTest.checkDetectedLeaks();
+        AbstractLauncherUiTest.checkDetectedLeaks(test.mLauncher);
     }
 
     // Please don't add negative test cases for methods that fail only after a long wait.