Sort administrator UIDs for NetworkCapabilities.

Administrator UIDs stored in NetworkCapabilities should be sorted. This
allows for easier equals checks and hashCode computation. Additionally,
duplicate UIDs should be prevented.

Bug: 147903575
Test: atest FrameworksNetTests
Change-Id: Ia5387ca2ce7c3fcbd04dc7fbff5266f7bcc71694

tests/net/common/java/android/net/NetworkCapabilitiesTest.java

@@ -441,6 +441,23 @@ public class NetworkCapabilitiesTest {
         return range;
     }
 
+    @Test
+    public void testSetAdministratorUids() {
+        NetworkCapabilities nc =
+                new NetworkCapabilities().setAdministratorUids(new int[] {2, 1, 3});
+
+        assertArrayEquals(new int[] {1, 2, 3}, nc.getAdministratorUids());
+    }
+
+    @Test
+    public void testSetAdministratorUidsWithDuplicates() {
+        try {
+            new NetworkCapabilities().setAdministratorUids(new int[] {1, 1});
+            fail("Expected IllegalArgumentException for duplicate uids");
+        } catch (IllegalArgumentException expected) {
+        }
+    }
+
     @Test
     public void testCombineCapabilities() {
         NetworkCapabilities nc1 = new NetworkCapabilities();