Make printers for a print service not react to press.

We show a list of printers for the a print service in the
print service settings activity. This list is there to
inform the user of which printers are available and
optionally offers adding a printer affordance. The printer
list items do nothing so they should not react to press
and create a false impression they do.

bug:10983508

Change-Id: I43b19ebb0acf6662c489826c192fd6daf8ad103d

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

@@ -639,6 +639,11 @@ public class PrintServiceSettingsFragment extends SettingsPreferenceFragment
             return convertView;
         }
 
+        @Override
+        public boolean isEnabled(int position) {
+            return false;
+        }
+
         @Override
         public Loader<List<PrinterInfo>> onCreateLoader(int id, Bundle args) {
             if (id == LOADER_ID_PRINTERS_LOADER) {