diff --git a/api/test-current.txt b/api/test-current.txt
index c84c77178f18a..e84d204919f09 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -20,6 +20,7 @@ package android.app {
 
   public class ActivityManager {
     method public void addOnUidImportanceListener(android.app.ActivityManager.OnUidImportanceListener, int);
+    method public void alwaysShowUnsupportedCompileSdkWarning(android.content.ComponentName);
     method public int getPackageImportance(java.lang.String);
     method public long getTotalRam();
     method public int getUidImportance(int);
diff --git a/core/java/android/app/ActivityManager.java b/core/java/android/app/ActivityManager.java
index a18ba718ecef3..3047cdb2c2408 100644
--- a/core/java/android/app/ActivityManager.java
+++ b/core/java/android/app/ActivityManager.java
@@ -3744,6 +3744,24 @@ public class ActivityManager {
         return SystemProperties.getBoolean("ro.test_harness", false);
     }
 
+    /**
+     * Unsupported compiled sdk warning should always be shown for the intput activity
+     * even in cases where the system would normally not show the warning. E.g. when running in a
+     * test harness.
+     *
+     * @param activity The component name of the activity to always show the warning for.
+     *
+     * @hide
+     */
+    @TestApi
+    public void alwaysShowUnsupportedCompileSdkWarning(ComponentName activity) {
+        try {
+            getService().alwaysShowUnsupportedCompileSdkWarning(activity);
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
+
     /**
      * Returns the launch count of each installed package.
      *
diff --git a/core/java/android/app/IActivityManager.aidl b/core/java/android/app/IActivityManager.aidl
index 0d45dfa9c7bf9..99efecd219848 100644
--- a/core/java/android/app/IActivityManager.aidl
+++ b/core/java/android/app/IActivityManager.aidl
@@ -703,4 +703,7 @@ interface IActivityManager {
      */
     void registerRemoteAnimationForNextActivityStart(in String packageName,
            in RemoteAnimationAdapter adapter);
+
+    /** @see android.app.ActivityManager#alwaysShowUnsupportedCompileSdkWarning */
+    void alwaysShowUnsupportedCompileSdkWarning(in ComponentName activity);
 }
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 955035b272bd0..4f0acf73b9011 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -26704,4 +26704,17 @@ public class ActivityManagerService extends IActivityManager.Stub
             }
         }
     }
+
+    /** @see android.app.ActivityManager#alwaysShowUnsupportedCompileSdkWarning */
+    @Override
+    public void alwaysShowUnsupportedCompileSdkWarning(ComponentName activity) {
+        synchronized (this) {
+            final long origId = Binder.clearCallingIdentity();
+            try {
+                mAppWarnings.alwaysShowUnsupportedCompileSdkWarning(activity);
+            } finally {
+                Binder.restoreCallingIdentity(origId);
+            }
+        }
+    }
 }
diff --git a/services/core/java/com/android/server/am/AppWarnings.java b/services/core/java/com/android/server/am/AppWarnings.java
index 4b43bd9db201b..ab1d7bf2ad7ec 100644
--- a/services/core/java/com/android/server/am/AppWarnings.java
+++ b/services/core/java/com/android/server/am/AppWarnings.java
@@ -17,6 +17,8 @@
 package com.android.server.am;
 
 import android.annotation.UiThread;
+import android.app.ActivityManager;
+import android.content.ComponentName;
 import android.content.Context;
 import android.content.res.Configuration;
 import android.os.Build;
@@ -39,6 +41,7 @@ import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Map;
 
 /**
@@ -64,6 +67,15 @@ class AppWarnings {
     private UnsupportedCompileSdkDialog mUnsupportedCompileSdkDialog;
     private DeprecatedTargetSdkVersionDialog mDeprecatedTargetSdkVersionDialog;
 
+    /** @see android.app.ActivityManager#alwaysShowUnsupportedCompileSdkWarning */
+    private HashSet<ComponentName> mAlwaysShowUnsupportedCompileSdkWarningActivities =
+            new HashSet<>();
+
+    /** @see android.app.ActivityManager#alwaysShowUnsupportedCompileSdkWarning */
+    void alwaysShowUnsupportedCompileSdkWarning(ComponentName activity) {
+        mAlwaysShowUnsupportedCompileSdkWarningActivities.add(activity);
+    }
+
     /**
      * Creates a new warning dialog manager.
      * <p>
@@ -110,6 +122,13 @@ class AppWarnings {
             return;
         }
 
+        if (ActivityManager.isRunningInTestHarness()
+                && !mAlwaysShowUnsupportedCompileSdkWarningActivities.contains(r.realActivity)) {
+            // Don't show warning if we are running in a test harness and we don't have to always
+            // show for this activity.
+            return;
+        }
+
         // If the application was built against an pre-release SDK that's older than the current
         // platform OR if the current platform is pre-release and older than the SDK against which
         // the application was built OR both are pre-release with the same SDK_INT but different