Small corrections to the code that generates the print summary in the settings.

- Optimize when the listener is active and rely on it to be cleaned up
  automatically
- Only count print jobs that should be shown (i.e. not ones that are
  already finished.)

Change-Id: Idba995f1036e736f47ca7402d493210600eae91c

src/com/android/settings/print/PrintSettingsFragment.java

@@ -590,7 +590,14 @@ public class PrintSettingsFragment extends SettingsPreferenceFragment
             }
             return printJobInfos;
         }
+    }
 
+    /**
+     * Should the print job the shown to the user in the settings app.
+     *
+     * @param printJob The print job in question.
+     * @return true iff the print job should be shown.
+     */
     private static boolean shouldShowToUser(PrintJobInfo printJob) {
         switch (printJob.getState()) {
             case PrintJobInfo.STATE_QUEUED:
@@ -602,7 +609,6 @@ public class PrintSettingsFragment extends SettingsPreferenceFragment
         }
         return false;
     }
-    }
 
     /**
      * Provider for the print settings summary
@@ -624,29 +630,32 @@ public class PrintSettingsFragment extends SettingsPreferenceFragment
             mSummaryLoader = summaryLoader;
             mPrintManager = ((PrintManager) context.getSystemService(Context.PRINT_SERVICE))
                     .getGlobalPrintManagerForUser(context.getUserId());
-            mPrintManager.addPrintJobStateChangeListener(this);
         }
 
         @Override
         public void setListening(boolean isListening) {
-            mPrintManager.removePrintJobStateChangeListener(this);
-
             if (isListening) {
                 mPrintManager.addPrintJobStateChangeListener(this);
-            }
                 onPrintJobStateChanged(null);
+            } else {
+                mPrintManager.removePrintJobStateChangeListener(this);
+            }
         }
 
         @Override
         public void onPrintJobStateChanged(PrintJobId printJobId) {
-            int numPrintJobs = mPrintManager.getPrintJobs().size();
-            mSummaryLoader.setSummary(this, mContext.getResources().getQuantityString(
-                    R.plurals.print_settings_title, numPrintJobs, numPrintJobs));
+            List<PrintJob> printJobs = mPrintManager.getPrintJobs();
+
+            int numActivePrintJobs = 0;
+            final int numPrintJobs = printJobs.size();
+            for (int i = 0; i < numPrintJobs; i++) {
+                if (shouldShowToUser(printJobs.get(i).getInfo())) {
+                    numActivePrintJobs++;
+                }
             }
 
-        @Override
-        protected void finalize() {
-            mPrintManager.removePrintJobStateChangeListener(this);
+            mSummaryLoader.setSummary(this, mContext.getResources().getQuantityString(
+                    R.plurals.print_settings_title, numActivePrintJobs, numActivePrintJobs));
         }
     }