Add support for singleTaskInstance displays

singleTaskInstance displays will only contain on task. This is mostly
used by ActivityView for use cases like bubbles.

Bug: 121047677
Test: atest ActivityManagerMultiDisplayTests#testSingleTaskInstanceDisplay
Change-Id: I5166015d8ecfa2845b4ffaa6c16d21a30a56b8a8

1 files changed, 13 insertions, 0 deletions

diff --git a/core/java/android/app/ActivityTaskManager.java b/core/java/android/app/ActivityTaskManager.java
index 4d8c8563ad7c..7eab5dba5f82 100644
--- a/core/java/android/app/ActivityTaskManager.java
+++ b/core/java/android/app/ActivityTaskManager.java
@@ -430,4 +430,17 @@ public class ActivityTaskManager {
             e.rethrowFromSystemServer();
         }
     }
+
+    /**
+     * Makes the display with the given id a single task instance display. I.e the display can only
+     * contain one task.
+     */
+    @RequiresPermission(android.Manifest.permission.MANAGE_ACTIVITY_STACKS)
+    public void setDisplayToSingleTaskInstance(int displayId) {
+        try {
+            getService().setDisplayToSingleTaskInstance(displayId);
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
 }