Use a Quantity String for the autofill password count.

Bug: 169455298
Test: manual - check display with sample app and different numbers of
 passwords
Test: make RunSettingsRoboTests
Test: atest SettingsUnitTests:com.android.settings.applications.autofill.PasswordsPreferenceControllerTest
Change-Id: I12f2a415499c210df429088fe11c64e7431babb3
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 50a8eea..4ef23a5 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -11686,6 +11686,12 @@
     <string name="autofill_app">Autofill service</string>
     <!-- Preference category for showing auto-fill services with saved passwords. [CHAR LIMIT=60] -->
     <string name="autofill_passwords">Passwords</string>
+    <!-- Summary for passwords settings that shows how many passwords are saved for each autofill
+         service. [CHAR LIMIT=NONE] -->
+    <plurals name="autofill_passwords_count">
+        <item quantity="one"><xliff:g id="count">%1$d</xliff:g> password</item>
+        <item quantity="other"><xliff:g id="count">%1$d</xliff:g> passwords</item>
+    </plurals>
     <!-- Keywords for the auto-fill feature. [CHAR LIMIT=NONE] -->
     <string name="autofill_keywords">auto, fill, autofill, password</string>
 
diff --git a/src/com/android/settings/applications/autofill/PasswordsPreferenceController.java b/src/com/android/settings/applications/autofill/PasswordsPreferenceController.java
index 123adda..47882de 100644
--- a/src/com/android/settings/applications/autofill/PasswordsPreferenceController.java
+++ b/src/com/android/settings/applications/autofill/PasswordsPreferenceController.java
@@ -50,6 +50,7 @@
 
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.os.IResultReceiver;
+import com.android.settings.R;
 import com.android.settings.Utils;
 import com.android.settings.core.BasePreferenceController;
 
@@ -130,9 +131,13 @@
 
             final MutableLiveData<Integer> passwordCount = new MutableLiveData<>();
             passwordCount.observe(
-                    // TODO(b/169455298): Validate the result.
-                    // TODO(b/169455298): Use a Quantity String resource.
-                    mLifecycleOwner, count -> pref.setSummary("" + count + " passwords saved"));
+                    mLifecycleOwner, count -> {
+                        // TODO(b/169455298): Validate the result.
+                        final CharSequence summary =
+                                mContext.getResources().getQuantityString(
+                                        R.plurals.autofill_passwords_count, count, count);
+                        pref.setSummary(summary);
+                    });
             // TODO(b/169455298): Limit the number of concurrent queries.
             // TODO(b/169455298): Cache the results for some time.
             requestSavedPasswordCount(service, user, passwordCount);