diff --git a/services/core/java/com/android/server/am/ActivityStartController.java b/services/core/java/com/android/server/am/ActivityStartController.java
index c926503da27dd..240f01d159a7b 100644
--- a/services/core/java/com/android/server/am/ActivityStartController.java
+++ b/services/core/java/com/android/server/am/ActivityStartController.java
@@ -334,6 +334,9 @@ public class ActivityStartController {
         } else {
             callingPid = callingUid = -1;
         }
+        boolean forceNewTask = false;
+        final int filterCallingUid = ActivityStarter.computeResolveFilterUid(
+                callingUid, realCallingUid, UserHandle.USER_NULL);
         final long origId = Binder.clearCallingIdentity();
         try {
             synchronized (mService) {
@@ -353,11 +356,13 @@ public class ActivityStartController {
 
                     // Don't modify the client's object!
                     intent = new Intent(intent);
+                    if (forceNewTask) {
+                        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+                    }
 
                     // Collect information about the target of the Intent.
                     ActivityInfo aInfo = mSupervisor.resolveActivity(intent, resolvedTypes[i], 0,
-                            null, userId, ActivityStarter.computeResolveFilterUid(
-                                    callingUid, realCallingUid, UserHandle.USER_NULL));
+                            null, userId, filterCallingUid);
                     // TODO: New, check if this is correct
                     aInfo = mService.getActivityInfoForUser(aInfo, userId);
 
@@ -397,7 +402,17 @@ public class ActivityStartController {
                         return res;
                     }
 
-                    resultTo = outActivity[0] != null ? outActivity[0].appToken : null;
+                    final ActivityRecord started = outActivity[0];
+                    if (started != null && started.getUid() == filterCallingUid) {
+                        // Only the started activity which has the same uid as the source caller can
+                        // be the caller of next activity.
+                        resultTo = started.appToken;
+                        forceNewTask = false;
+                    } else {
+                        // Different apps not adjacent to the caller are forced to be new task.
+                        resultTo = null;
+                        forceNewTask = true;
+                    }
                 }
             }
         } finally {