Invoke close() method for BatteryUsageStats to close cursor window

- Invoke close() method for BatteryUsageStats to close cursor window,
   avoid OOM.

Bug: 245385410
Test: make SettingsRoboTests
Change-Id: I68f36a42a33d2546cb191cec88f5431e24dd5b84
(cherry picked from commit f164be387e)

src/com/android/settings/applications/appinfo/AppBatteryPreferenceController.java

@@ -169,6 +169,7 @@ public class AppBatteryPreferenceController extends BasePreferenceController
     public void onPause() {
         mParent.getLoaderManager().destroyLoader(
                 AppInfoDashboardFragment.LOADER_BATTERY_USAGE_STATS);
+        closeBatteryUsageStats();
     }
 
     private void loadBatteryDiffEntries() {
@@ -292,6 +293,7 @@ public class AppBatteryPreferenceController extends BasePreferenceController
         @Override
         public void onLoadFinished(Loader<BatteryUsageStats> loader,
                 BatteryUsageStats batteryUsageStats) {
+            closeBatteryUsageStats();
             mBatteryUsageStats = batteryUsageStats;
             AppBatteryPreferenceController.this.onLoadFinished();
         }
@@ -300,4 +302,16 @@ public class AppBatteryPreferenceController extends BasePreferenceController
         public void onLoaderReset(Loader<BatteryUsageStats> loader) {
         }
     }
+
+    private void closeBatteryUsageStats() {
+        if (mBatteryUsageStats != null) {
+            try {
+                mBatteryUsageStats.close();
+            } catch (Exception e) {
+                Log.e(TAG, "BatteryUsageStats.close() failed", e);
+            } finally {
+                mBatteryUsageStats = null;
+            }
+        }
+    }
 }