Fix issue "open battery settings, switch locale, apps are still in old locale" into pi-dev

Clear uid to package detail cache by checking locale before use.

Fixes: 62422871
Test: RunSettingsRoboTest pass,
manual test
(1) open advance battery settings page,
(2) switch locale,
(3) back to advance battery settings page  => pass
manual test
(1) open advance battery settings page, and then back to settings main page
(2) switch locale,
(3) go to advance battery settings page  => pass

Change-Id: Ifac830706539022cd9bf51d3f33e728aadc163f4

src/com/android/settings/fuelgauge/BatteryEntry.java

@@ -38,6 +38,7 @@ import com.android.settingslib.Utils;
 
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.Locale;
 
 /**
  * Wraps the power usage data of a BatterySipper with information about package name
@@ -55,6 +56,8 @@ public class BatteryEntry {
     static final ArrayList<BatteryEntry> mRequestQueue = new ArrayList<BatteryEntry>();
     static Handler sHandler;
 
+    static Locale sCurrentLocale = null;
+
     static private class NameAndIconLoader extends Thread {
         private boolean mAbort = false;
 
@@ -227,6 +230,13 @@ public class BatteryEntry {
     }
 
     void getQuickNameIconForUid(final int uid) {
+        // Locale sync to system config in Settings
+        final Locale locale = Locale.getDefault();
+        if (sCurrentLocale != locale) {
+            clearUidCache();
+            sCurrentLocale = locale;
+        }
+
         final String uidString = Integer.toString(uid);
         if (sUidCache.containsKey(uidString)) {
             UidToDetail utd = sUidCache.get(uidString);

tests/robotests/src/com/android/settings/fuelgauge/BatteryEntryTest.java

@@ -39,6 +39,8 @@ import org.mockito.junit.MockitoJUnit;
 import org.mockito.junit.MockitoRule;
 import org.robolectric.RobolectricTestRunner;
 
+import java.util.Locale;
+
 @RunWith(RobolectricTestRunner.class)
 public class BatteryEntryTest {
 
@@ -148,4 +150,17 @@ public class BatteryEntryTest {
 
         assertThat(entry.extractPackagesFromSipper(entry.sipper)).isEqualTo(entry.sipper.mPackages);
     }
+
+    @Test
+    public void testUidCache_switchLocale_shouldCleanCache() {
+        BatteryEntry.stopRequestQueue();
+
+        Locale.setDefault(new Locale("en_US"));
+        BatteryEntry.sUidCache.put(Integer.toString(APP_UID), null);
+        assertThat(BatteryEntry.sUidCache).isNotEmpty();
+
+        Locale.setDefault(new Locale("zh_TW"));
+        createBatteryEntryForApp();
+        assertThat(BatteryEntry.sUidCache).isEmpty(); // check if cache is clear
+    }
 }