Don't fire 'changed' event if printer list is not updated

The printer list is tried to be updated when the network is changed
but the 'changed' event was fired even if the printer list is not
changed at all.

This CL suppresses events if the list is not changed.

Bug: 132840441
Test: run 'cts-tradefed run commandAndExit cts-dev --module
    CtsPrintTestCases --test android.print.cts.
    PrintDocumentAdapterContractTest#unexpectedLayoutCancel' 30 times
Change-Id: I9236e56ea9e19e37be29d6a1d0015ee0b2676460

1 files changed, 5 insertions, 0 deletions

diff --git a/packages/PrintSpooler/src/com/android/printspooler/ui/FusedPrintersProvider.java b/packages/PrintSpooler/src/com/android/printspooler/ui/FusedPrintersProvider.java
index 5be0176cf4cc..c5138c533cd0 100644
--- a/packages/PrintSpooler/src/com/android/printspooler/ui/FusedPrintersProvider.java
+++ b/packages/PrintSpooler/src/com/android/printspooler/ui/FusedPrintersProvider.java
@@ -232,6 +232,11 @@ public final class FusedPrintersProvider extends Loader<List<PrinterInfo>>
         // Add the new printers, i.e. what is left.
         printers.addAll(discoveredPrinters.values());
 
+        // Do nothing if the printer list is not changed.
+        if (Objects.equals(mPrinters, printers)) {
+            return;
+        }
+
         // Update the list of printers.
         mPrinters.clear();
         mPrinters.addAll(printers);