Invoke close() method for BatteryUsageStats to close cursor window

invoke close() method for BatteryUsageStats to close cursor window,
since BatteryUsageStats will implement "Closeable" interface in T.
(from Dimitri's request)

Bug: 201229421
Test: make SettingsRoboTests
Change-Id: Ibfca404d00cce51405cffddb636f685869ac130b

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

@@ -167,7 +167,14 @@ public class BatteryInfo {
                                 new String[0], /* includePowerModels */ false).build();
                     }
                 }
-                return getBatteryInfo(context, stats, shortString);
+                final BatteryInfo batteryInfo =
+                        getBatteryInfo(context, stats, shortString);
+                try {
+                    stats.close();
+                } catch (Exception e) {
+                    Log.e(TAG, "BatteryUsageStats.close() failed", e);
+                }
+                return batteryInfo;
             }
 
             @Override

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

@@ -405,6 +405,11 @@ public class BatteryUtils {
                 batteryUsageStats, estimate, elapsedRealtimeUs, false /* shortString */);
         BatteryUtils.logRuntime(tag, "BatteryInfoLoader.loadInBackground", startTime);
 
+        try {
+            batteryUsageStats.close();
+        } catch (Exception e) {
+            Log.e(TAG, "BatteryUsageStats.close() failed", e);
+        }
         return batteryInfo;
     }
 

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

@@ -22,6 +22,7 @@ import android.os.BatteryStats;
 import android.os.BatteryStatsManager;
 import android.os.BatteryUsageStats;
 import android.os.SystemClock;
+import android.util.Log;
 
 import com.android.internal.os.BatteryStatsHelper;
 import com.android.settings.overlay.FeatureFactory;
@@ -34,6 +35,8 @@ import java.util.ArrayList;
 import java.util.List;
 
 public class DebugEstimatesLoader extends AsyncLoaderCompat<List<BatteryInfo>> {
+    private static final String TAG = "DebugEstimatesLoader";
+
     private BatteryStatsHelper mStatsHelper;
 
     public DebugEstimatesLoader(Context context, BatteryStatsHelper statsHelper) {
@@ -58,8 +61,16 @@ public class DebugEstimatesLoader extends AsyncLoaderCompat<List<BatteryInfo>> {
         Intent batteryBroadcast = getContext().registerReceiver(null,
                 new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
         BatteryStats stats = mStatsHelper.getStats();
-        BatteryUsageStats batteryUsageStats =
+        BatteryUsageStats batteryUsageStats;
-                context.getSystemService(BatteryStatsManager.class).getBatteryUsageStats();
+        try {
+            batteryUsageStats = context.getSystemService(BatteryStatsManager.class)
+                    .getBatteryUsageStats();
+        } catch (RuntimeException e) {
+            Log.e(TAG, "getBatteryInfo() from getBatteryUsageStats()", e);
+            // Use default BatteryUsageStats.
+            batteryUsageStats = new BatteryUsageStats.Builder(
+                    new String[0], /* includePowerModels */ false).build();
+        }
         BatteryInfo oldinfo = BatteryInfo.getBatteryInfoOld(getContext(), batteryBroadcast,
                 batteryUsageStats, elapsedRealtimeUs, false);
 
@@ -74,6 +85,12 @@ public class DebugEstimatesLoader extends AsyncLoaderCompat<List<BatteryInfo>> {
         List<BatteryInfo> infos = new ArrayList<>();
         infos.add(oldinfo);
         infos.add(newInfo);
+
+        try {
+            batteryUsageStats.close();
+        } catch (Exception e) {
+            Log.e(TAG, "BatteryUsageStats.close() failed", e);
+        }
         return infos;
     }
 }

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

@@ -22,6 +22,7 @@ import android.content.Context;
 import android.os.BatteryUsageStats;
 import android.os.Bundle;
 import android.os.UserManager;
+import android.util.Log;
 import android.view.Menu;
 
 import androidx.annotation.NonNull;
@@ -103,6 +104,16 @@ public abstract class PowerUsageBase extends DashboardFragment {
         final long startTime = System.currentTimeMillis();
         historyPref.setBatteryUsageStats(mBatteryUsageStats);
         BatteryUtils.logRuntime(TAG, "updatePreference", startTime);
+        if (mBatteryUsageStats == null) {
+            return;
+        }
+        try {
+            mBatteryUsageStats.close();
+        } catch (Exception e) {
+            Log.e(TAG, "BatteryUsageStats.close() failed", e);
+        } finally {
+            mBatteryUsageStats = null;
+        }
     }
 
     private class BatteryUsageStatsLoaderCallbacks