diff --git a/src/com/android/settings/fuelgauge/AdvancedPowerUsageDetail.java b/src/com/android/settings/fuelgauge/AdvancedPowerUsageDetail.java
index 39b72cc..320031e 100644
--- a/src/com/android/settings/fuelgauge/AdvancedPowerUsageDetail.java
+++ b/src/com/android/settings/fuelgauge/AdvancedPowerUsageDetail.java
@@ -104,10 +104,11 @@
         final Bundle args = new Bundle();
         final BatterySipper sipper = entry.sipper;
         final BatteryStats.Uid uid = sipper.uidObj;
+        final BatteryUtils batteryUtils = BatteryUtils.getInstance(caller);
 
-        final long backgroundTimeMs = BatteryUtils.getProcessTimeMs(
+        final long backgroundTimeMs = batteryUtils.getProcessTimeMs(
                 BatteryUtils.StatusType.BACKGROUND, uid, which);
-        final long foregroundTimeMs = BatteryUtils.getProcessTimeMs(
+        final long foregroundTimeMs = batteryUtils.getProcessTimeMs(
                 BatteryUtils.StatusType.FOREGROUND, uid, which);
 
         if (ArrayUtils.isEmpty(sipper.mPackages)) {
diff --git a/src/com/android/settings/fuelgauge/BatteryUtils.java b/src/com/android/settings/fuelgauge/BatteryUtils.java
index 85bc0fd..a3ea5cd 100644
--- a/src/com/android/settings/fuelgauge/BatteryUtils.java
+++ b/src/com/android/settings/fuelgauge/BatteryUtils.java
@@ -16,9 +16,13 @@
 package com.android.settings.fuelgauge;
 
 import android.annotation.IntDef;
+import android.content.Context;
+import android.content.pm.PackageManager;
 import android.os.BatteryStats;
 import android.os.SystemClock;
 import android.support.annotation.Nullable;
+import android.support.annotation.VisibleForTesting;
+import android.util.Log;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -38,7 +42,23 @@
         int ALL = 2;
     }
 
-    public static long getProcessTimeMs(@StatusType int type, @Nullable BatteryStats.Uid uid,
+    private static final String TAG = "BatteryUtils";
+    private static BatteryUtils sInstance;
+
+    private PackageManager mPackageManager;
+
+    public static BatteryUtils getInstance(Context context) {
+        if (sInstance == null || sInstance.isDataCorrupted()) {
+            sInstance = new BatteryUtils(context);
+        }
+        return sInstance;
+    }
+
+    private BatteryUtils(Context context) {
+        mPackageManager = context.getPackageManager();
+    }
+
+    public long getProcessTimeMs(@StatusType int type, @Nullable BatteryStats.Uid uid,
             int which) {
         if (uid == null) {
             return 0;
@@ -56,34 +76,46 @@
         return 0;
     }
 
-    private static long getProcessBackgroundTimeMs(BatteryStats.Uid uid, int which) {
+    private long getProcessBackgroundTimeMs(BatteryStats.Uid uid, int which) {
         final long rawRealTimeUs = convertMsToUs(SystemClock.elapsedRealtime());
         final long timeUs = uid.getProcessStateTime(
                 BatteryStats.Uid.PROCESS_STATE_BACKGROUND, rawRealTimeUs, which);
-        return  convertUsToMs(timeUs);
+
+        Log.v(TAG, "package: " + mPackageManager.getNameForUid(uid.getUid()));
+        Log.v(TAG, "background time(us): " + timeUs);
+        return convertUsToMs(timeUs);
     }
 
-    private static long getProcessForegroundTimeMs(BatteryStats.Uid uid, int which) {
+    private long getProcessForegroundTimeMs(BatteryStats.Uid uid, int which) {
         final long rawRealTimeUs = convertMsToUs(SystemClock.elapsedRealtime());
         final int foregroundTypes[] = {BatteryStats.Uid.PROCESS_STATE_TOP,
                 BatteryStats.Uid.PROCESS_STATE_FOREGROUND_SERVICE,
                 BatteryStats.Uid.PROCESS_STATE_TOP_SLEEPING,
                 BatteryStats.Uid.PROCESS_STATE_FOREGROUND};
+        Log.v(TAG, "package: " + mPackageManager.getNameForUid(uid.getUid()));
+
         long timeUs = 0;
         for (int type : foregroundTypes) {
-            timeUs += uid.getProcessStateTime(type, rawRealTimeUs, which);
+            final long localTime = uid.getProcessStateTime(type, rawRealTimeUs, which);
+            Log.v(TAG, "type: " + type + " time(us): " + localTime);
+            timeUs += localTime;
         }
+        Log.v(TAG, "foreground time(us): " + timeUs);
 
         return convertUsToMs(timeUs);
     }
 
-    private static long convertUsToMs(long timeUs) {
+    private long convertUsToMs(long timeUs) {
         return timeUs / 1000;
     }
 
-    private static long convertMsToUs(long timeMs) {
+    private long convertMsToUs(long timeMs) {
         return timeMs * 1000;
     }
 
+    private boolean isDataCorrupted() {
+        return mPackageManager == null;
+    }
+
 }
 
diff --git a/src/com/android/settings/fuelgauge/PowerUsageAdvanced.java b/src/com/android/settings/fuelgauge/PowerUsageAdvanced.java
index b341760..3509834 100644
--- a/src/com/android/settings/fuelgauge/PowerUsageAdvanced.java
+++ b/src/com/android/settings/fuelgauge/PowerUsageAdvanced.java
@@ -74,6 +74,7 @@
     private PackageManager mPackageManager;
     private UserManager mUserManager;
     private Map<Integer, PowerUsageData> mBatteryDataMap;
+    private BatteryUtils mBatteryUtils;
 
     Handler mHandler = new Handler() {
 
@@ -117,6 +118,7 @@
                 .getPowerUsageFeatureProvider(context);
         mPackageManager = context.getPackageManager();
         mUserManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
+        mBatteryUtils = BatteryUtils.getInstance(context);
     }
 
     @Override
@@ -239,8 +241,8 @@
             final PowerUsageData usageData = batteryDataMap.get(extractUsageType(sipper));
             usageData.totalPowerMah += sipper.totalPowerMah;
             if (sipper.drainType == DrainType.APP && sipper.usageTimeMs != 0) {
-                sipper.usageTimeMs = BatteryUtils.getProcessTimeMs(BatteryUtils.StatusType.ALL,
-                        sipper.uidObj, STATUS_TYPE);
+                sipper.usageTimeMs = mBatteryUtils.getProcessTimeMs(
+                        BatteryUtils.StatusType.FOREGROUND, sipper.uidObj, STATUS_TYPE);
             }
             usageData.totalUsageTimeMs += sipper.usageTimeMs;
             usageData.usageList.add(sipper);
diff --git a/src/com/android/settings/fuelgauge/PowerUsageSummary.java b/src/com/android/settings/fuelgauge/PowerUsageSummary.java
index d9323db..b23f9e3 100644
--- a/src/com/android/settings/fuelgauge/PowerUsageSummary.java
+++ b/src/com/android/settings/fuelgauge/PowerUsageSummary.java
@@ -110,6 +110,8 @@
     PowerGaugePreference mLastFullChargePref;
     @VisibleForTesting
     PowerUsageFeatureProvider mPowerFeatureProvider;
+    @VisibleForTesting
+    BatteryUtils mBatteryUtils;
 
     private LayoutPreference mBatteryLayoutPref;
     private PreferenceGroup mAppListGroup;
@@ -127,6 +129,8 @@
                 KEY_TIME_SINCE_LAST_FULL_CHARGE);
         mFooterPreferenceMixin.createFooterPreference().setTitle(R.string.battery_footer_summary);
 
+        mBatteryUtils = BatteryUtils.getInstance(getContext());
+
         initFeatureProvider();
     }
 
@@ -494,7 +498,7 @@
                 pref.setOrder(i + 1);
                 pref.setPercent(percentOfTotal);
                 if (sipper.usageTimeMs == 0 && sipper.drainType == DrainType.APP) {
-                    sipper.usageTimeMs = BatteryUtils.getProcessTimeMs(
+                    sipper.usageTimeMs = mBatteryUtils.getProcessTimeMs(
                             BatteryUtils.StatusType.FOREGROUND, sipper.uidObj, mStatsType);
                 }
                 setUsageSummary(pref, usedTime, sipper.usageTimeMs);
diff --git a/tests/robotests/src/com/android/settings/applications/InstalledAppDetailsTest.java b/tests/robotests/src/com/android/settings/applications/InstalledAppDetailsTest.java
index a33a8c8..5b1019e 100644
--- a/tests/robotests/src/com/android/settings/applications/InstalledAppDetailsTest.java
+++ b/tests/robotests/src/com/android/settings/applications/InstalledAppDetailsTest.java
@@ -74,7 +74,7 @@
     ApplicationFeatureProvider mApplicationFeatureProvider;
     @Mock(answer = Answers.RETURNS_DEEP_STUBS)
     private UserManager mUserManager;
-    @Mock
+    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
     private SettingsActivity mActivity;
     @Mock
     private DevicePolicyManager mDevicePolicyManager;
diff --git a/tests/robotests/src/com/android/settings/fuelgauge/AdvancedPowerUsageDetailTest.java b/tests/robotests/src/com/android/settings/fuelgauge/AdvancedPowerUsageDetailTest.java
index 8b5ce19..03892a3 100644
--- a/tests/robotests/src/com/android/settings/fuelgauge/AdvancedPowerUsageDetailTest.java
+++ b/tests/robotests/src/com/android/settings/fuelgauge/AdvancedPowerUsageDetailTest.java
@@ -21,6 +21,7 @@
 import android.app.Fragment;
 import android.content.Context;
 import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
 import android.graphics.drawable.Drawable;
 import android.os.BatteryStats;
 import android.os.Bundle;
@@ -96,7 +97,8 @@
     private BatteryStatsHelper mBatteryStatsHelper;
     @Mock
     private BatteryStats.Uid mUid;
-    private Bundle mTestBundle;
+    @Mock
+    private PackageManager mPackageManager;
     private AdvancedPowerUsageDetail mFragment;
     private FakeFeatureFactory mFeatureFactory;
     private SettingsActivity mTestActivity;
@@ -141,6 +143,7 @@
         mAppEntry.info = mock(ApplicationInfo.class);
 
         mTestActivity = spy(new SettingsActivity());
+        doReturn(mPackageManager).when(mTestActivity).getPackageManager();
 
         final ArgumentCaptor<Bundle> captor = ArgumentCaptor.forClass(Bundle.class);
 
diff --git a/tests/robotests/src/com/android/settings/fuelgauge/BatteryUtilsTest.java b/tests/robotests/src/com/android/settings/fuelgauge/BatteryUtilsTest.java
index 672cc90..3699147 100644
--- a/tests/robotests/src/com/android/settings/fuelgauge/BatteryUtilsTest.java
+++ b/tests/robotests/src/com/android/settings/fuelgauge/BatteryUtilsTest.java
@@ -25,6 +25,7 @@
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
+import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
 
 import static android.os.BatteryStats.Uid.PROCESS_STATE_BACKGROUND;
@@ -56,7 +57,8 @@
     private static final long TIME_EXPECTED_ALL = 15000;
 
     @Mock
-    BatteryStats.Uid mUid;
+    private BatteryStats.Uid mUid;
+    private BatteryUtils mBatteryUtils;
 
     @Before
     public void setUp() {
@@ -72,11 +74,13 @@
                 anyLong(), anyInt());
         doReturn(TIME_STATE_BACKGROUND).when(mUid).getProcessStateTime(eq(PROCESS_STATE_BACKGROUND),
                 anyLong(), anyInt());
+
+        mBatteryUtils = BatteryUtils.getInstance(RuntimeEnvironment.application);
     }
 
     @Test
     public void testGetProcessTimeMs_typeForeground_timeCorrect() {
-        final long time = BatteryUtils.getProcessTimeMs(BatteryUtils.StatusType.FOREGROUND, mUid,
+        final long time = mBatteryUtils.getProcessTimeMs(BatteryUtils.StatusType.FOREGROUND, mUid,
                 BatteryStats.STATS_SINCE_CHARGED);
 
         assertThat(time).isEqualTo(TIME_EXPECTED_FOREGROUND);
@@ -84,7 +88,7 @@
 
     @Test
     public void testGetProcessTimeMs_typeBackground_timeCorrect() {
-        final long time = BatteryUtils.getProcessTimeMs(BatteryUtils.StatusType.BACKGROUND, mUid,
+        final long time = mBatteryUtils.getProcessTimeMs(BatteryUtils.StatusType.BACKGROUND, mUid,
                 BatteryStats.STATS_SINCE_CHARGED);
 
         assertThat(time).isEqualTo(TIME_EXPECTED_BACKGROUND);
@@ -92,7 +96,7 @@
 
     @Test
     public void testGetProcessTimeMs_typeAll_timeCorrect() {
-        final long time = BatteryUtils.getProcessTimeMs(BatteryUtils.StatusType.ALL, mUid,
+        final long time = mBatteryUtils.getProcessTimeMs(BatteryUtils.StatusType.ALL, mUid,
                 BatteryStats.STATS_SINCE_CHARGED);
 
         assertThat(time).isEqualTo(TIME_EXPECTED_ALL);
@@ -100,7 +104,7 @@
 
     @Test
     public void testGetProcessTimeMs_uidNull_returnZero() {
-        final long time = BatteryUtils.getProcessTimeMs(BatteryUtils.StatusType.ALL, null,
+        final long time = mBatteryUtils.getProcessTimeMs(BatteryUtils.StatusType.ALL, null,
                 BatteryStats.STATS_SINCE_CHARGED);
 
         assertThat(time).isEqualTo(0);