Data usage performance, bugfixes.

Optimize launch times by removing unneeded extra work, including
reloading data and tightening chart invalidation.  Fix invalidation
storm when sweeps overlap.  Move chart history into loader instead of
blocking main thread.

Disable "Split 4G" mode until telephony support is ready, and combine
any existing split policies.

Async loading of application details.  Remove alpha transitions to
speed up on some hardware.  Hide menus in detail mode.  Delay kicking
off force-poll.  Fix inset padding on large devices.

Bug: 5284321, 5273918, 5263056
Change-Id: I746d79c05e2a6ea97bbdbdc5d807e208328d1373

12 files changed, 653 insertions, 249 deletions

diff --git a/src/com/android/settings/DataUsageSummary.java b/src/com/android/settings/DataUsageSummary.java
index 417c52543..0e080750a 100644
--- a/src/com/android/settings/DataUsageSummary.java
+++ b/src/com/android/settings/DataUsageSummary.java
@@ -25,11 +25,6 @@ import static android.net.NetworkPolicyManager.POLICY_NONE;
 import static android.net.NetworkPolicyManager.POLICY_REJECT_METERED_BACKGROUND;
 import static android.net.NetworkPolicyManager.computeLastCycleBoundary;
 import static android.net.NetworkPolicyManager.computeNextCycleBoundary;
-import static android.net.NetworkStats.SET_DEFAULT;
-import static android.net.NetworkStats.SET_FOREGROUND;
-import static android.net.NetworkStats.TAG_NONE;
-import static android.net.NetworkStatsHistory.FIELD_RX_BYTES;
-import static android.net.NetworkStatsHistory.FIELD_TX_BYTES;
 import static android.net.NetworkTemplate.MATCH_MOBILE_3G_LOWER;
 import static android.net.NetworkTemplate.MATCH_MOBILE_4G;
 import static android.net.NetworkTemplate.MATCH_MOBILE_ALL;
@@ -43,6 +38,7 @@ import static android.text.format.DateUtils.FORMAT_ABBREV_MONTH;
 import static android.text.format.DateUtils.FORMAT_SHOW_DATE;
 import static android.text.format.Time.TIMEZONE_UTC;
 import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
+import static com.android.internal.util.Preconditions.checkNotNull;
 import static com.android.settings.Utils.prepareCustomPreferencesList;
 
 import android.animation.LayoutTransition;
@@ -58,15 +54,11 @@ import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.Loader;
 import android.content.SharedPreferences;
-import android.content.pm.ApplicationInfo;
-import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
-import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.res.Resources;
 import android.graphics.Color;
 import android.graphics.drawable.ColorDrawable;
 import android.graphics.drawable.Drawable;
-import android.graphics.drawable.InsetDrawable;
 import android.net.ConnectivityManager;
 import android.net.INetworkPolicyManager;
 import android.net.INetworkStatsService;
@@ -123,9 +115,12 @@ import android.widget.TextView;
 
 import com.android.internal.telephony.Phone;
 import com.android.settings.drawable.InsetBoundsDrawable;
-import com.android.settings.drawable.DrawableWrapper;
+import com.android.settings.net.ChartData;
+import com.android.settings.net.ChartDataLoader;
 import com.android.settings.net.NetworkPolicyEditor;
 import com.android.settings.net.SummaryForAllUidLoader;
+import com.android.settings.net.UidDetail;
+import com.android.settings.net.UidDetailProvider;
 import com.android.settings.widget.ChartDataUsageView;
 import com.android.settings.widget.ChartDataUsageView.DataUsageChartListener;
 import com.android.settings.widget.PieChartView;
@@ -165,7 +160,8 @@ public class DataUsageSummary extends Fragment {
     private static final String TAG_CONFIRM_APP_RESTRICT = "confirmAppRestrict";
     private static final String TAG_APP_DETAILS = "appDetails";
 
-    private static final int LOADER_SUMMARY = 2;
+    private static final int LOADER_CHART_DATA = 2;
+    private static final int LOADER_SUMMARY = 3;
 
     private static final long KB_IN_BYTES = 1024;
     private static final long MB_IN_BYTES = KB_IN_BYTES * 1024;
@@ -188,6 +184,9 @@ public class DataUsageSummary extends Fragment {
     private ListView mListView;
     private DataUsageAdapter mAdapter;
 
+    /** Distance to inset content from sides, when needed. */
+    private int mInsetSide = 0;
+
     private ViewGroup mHeader;
 
     private ViewGroup mNetworkSwitchesContainer;
@@ -220,7 +219,8 @@ public class DataUsageSummary extends Fragment {
     private boolean mShowWifi = false;
     private boolean mShowEthernet = false;
 
-    private NetworkTemplate mTemplate = null;
+    private NetworkTemplate mTemplate;
+    private ChartData mChartData;
 
     private int[] mAppDetailUids = null;
 
@@ -228,11 +228,6 @@ public class DataUsageSummary extends Fragment {
 
     private NetworkPolicyEditor mPolicyEditor;
 
-    private NetworkStatsHistory mHistory;
-    private NetworkStatsHistory mDetailHistory;
-    private NetworkStatsHistory mDetailHistoryDefault;
-    private NetworkStatsHistory mDetailHistoryForeground;
-
     private String mCurrentTab = null;
     private String mIntentTab = null;
 
@@ -242,6 +237,8 @@ public class DataUsageSummary extends Fragment {
     /** Flag used to ignore listeners during binding. */
     private boolean mBinding;
 
+    private UidDetailProvider mUidDetailProvider;
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -273,25 +270,39 @@ public class DataUsageSummary extends Fragment {
         final Context context = inflater.getContext();
         final View view = inflater.inflate(R.layout.data_usage_summary, container, false);
 
+        mUidDetailProvider = new UidDetailProvider(context);
+
         mTabHost = (TabHost) view.findViewById(android.R.id.tabhost);
         mTabsContainer = (ViewGroup) view.findViewById(R.id.tabs_container);
         mTabWidget = (TabWidget) view.findViewById(android.R.id.tabs);
         mListView = (ListView) view.findViewById(android.R.id.list);
 
+        // decide if we need to manually inset our content, or if we should rely
+        // on parent container for inset.
+        final boolean shouldInset = mListView.getScrollBarStyle()
+                == View.SCROLLBARS_OUTSIDE_OVERLAY;
+        if (shouldInset) {
+            mInsetSide = view.getResources().getDimensionPixelOffset(
+                    com.android.internal.R.dimen.preference_fragment_padding_side);
+        } else {
+            mInsetSide = 0;
+        }
+
         // adjust padding around tabwidget as needed
         prepareCustomPreferencesList(container, view, mListView, true);
 
-        // inset selector and divider drawables
-        final int insetSide = view.getResources().getDimensionPixelOffset(
-                com.android.internal.R.dimen.preference_fragment_padding_side);
-        insetListViewDrawables(mListView, insetSide);
-
         mTabHost.setup();
         mTabHost.setOnTabChangedListener(mTabListener);
 
         mHeader = (ViewGroup) inflater.inflate(R.layout.data_usage_header, mListView, false);
         mListView.addHeaderView(mHeader, null, false);
 
+        if (mInsetSide > 0) {
+            // inset selector and divider drawables
+            insetListViewDrawables(mListView, mInsetSide);
+            mHeader.setPadding(mInsetSide, 0, mInsetSide, 0);
+        }
+
         {
             // bind network switches
             mNetworkSwitchesContainer = (ViewGroup) mHeader.findViewById(
@@ -346,7 +357,7 @@ public class DataUsageSummary extends Fragment {
         // only assign layout transitions once first layout is finished
         mListView.getViewTreeObserver().addOnGlobalLayoutListener(mFirstLayoutListener);
 
-        mAdapter = new DataUsageAdapter();
+        mAdapter = new DataUsageAdapter(mUidDetailProvider, mInsetSide);
         mListView.setOnItemClickListener(mListListener);
         mListView.setAdapter(mAdapter);
 
@@ -370,7 +381,10 @@ public class DataUsageSummary extends Fragment {
             @Override
             protected Void doInBackground(Void... params) {
                 try {
+                    // wait a few seconds before kicking off
+                    Thread.sleep(2 * DateUtils.SECOND_IN_MILLIS);
                     mStatsService.forceUpdate();
+                } catch (InterruptedException e) {
                 } catch (RemoteException e) {
                 }
                 return null;
@@ -382,7 +396,7 @@ public class DataUsageSummary extends Fragment {
                     updateBody();
                 }
             }
-        }.execute();
+        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
     }
 
     @Override
@@ -393,21 +407,23 @@ public class DataUsageSummary extends Fragment {
     @Override
     public void onPrepareOptionsMenu(Menu menu) {
         final Context context = getActivity();
+        final boolean appDetailMode = isAppDetailMode();
 
         mMenuDataRoaming = menu.findItem(R.id.data_usage_menu_roaming);
-        mMenuDataRoaming.setVisible(hasMobileRadio(context));
+        mMenuDataRoaming.setVisible(hasMobileRadio(context) && !appDetailMode);
         mMenuDataRoaming.setChecked(getDataRoaming());
 
         mMenuRestrictBackground = menu.findItem(R.id.data_usage_menu_restrict_background);
+        mMenuRestrictBackground.setVisible(!appDetailMode);
         mMenuRestrictBackground.setChecked(getRestrictBackground());
 
         final MenuItem split4g = menu.findItem(R.id.data_usage_menu_split_4g);
-        split4g.setVisible(hasMobile4gRadio(context));
+        split4g.setVisible(hasMobile4gRadio(context) && !appDetailMode);
         split4g.setChecked(isMobilePolicySplit());
 
         final MenuItem showWifi = menu.findItem(R.id.data_usage_menu_show_wifi);
         if (hasWifiRadio(context) && hasMobileRadio(context)) {
-            showWifi.setVisible(true);
+            showWifi.setVisible(!appDetailMode);
             showWifi.setChecked(mShowWifi);
         } else {
             showWifi.setVisible(false);
@@ -416,7 +432,7 @@ public class DataUsageSummary extends Fragment {
 
         final MenuItem showEthernet = menu.findItem(R.id.data_usage_menu_show_ethernet);
         if (hasEthernet(context) && hasMobileRadio(context)) {
-            showEthernet.setVisible(true);
+            showEthernet.setVisible(!appDetailMode);
             showEthernet.setChecked(mShowEthernet);
         } else {
             showEthernet.setVisible(false);
@@ -478,6 +494,9 @@ public class DataUsageSummary extends Fragment {
 
         mDataEnabledView = null;
         mDisableAtLimitView = null;
+
+        mUidDetailProvider.clearCache();
+        mUidDetailProvider = null;
     }
 
     /**
@@ -495,6 +514,7 @@ public class DataUsageSummary extends Fragment {
             final LayoutTransition chartTransition = buildLayoutTransition();
             chartTransition.setStartDelay(LayoutTransition.APPEARING, 0);
             chartTransition.setStartDelay(LayoutTransition.DISAPPEARING, 0);
+            chartTransition.setAnimator(LayoutTransition.APPEARING, null);
             chartTransition.setAnimator(LayoutTransition.DISAPPEARING, null);
             mChart.setLayoutTransition(chartTransition);
         }
@@ -536,17 +556,14 @@ public class DataUsageSummary extends Fragment {
         mTabWidget.setVisibility(multipleTabs ? View.VISIBLE : View.GONE);
         if (mIntentTab != null) {
             if (Objects.equal(mIntentTab, mTabHost.getCurrentTabTag())) {
+                // already hit updateBody() when added; ignore
                 updateBody();
             } else {
                 mTabHost.setCurrentTabByTag(mIntentTab);
             }
             mIntentTab = null;
         } else {
-            if (mTabHost.getCurrentTab() == 0) {
-                updateBody();
-            } else {
-                mTabHost.setCurrentTab(0);
-            }
+            // already hit updateBody() when added; ignore
         }
     }
 
@@ -583,6 +600,7 @@ public class DataUsageSummary extends Fragment {
      */
     private void updateBody() {
         mBinding = true;
+        if (!isAdded()) return;
 
         final Context context = getActivity();
         final String currentTab = mTabHost.getCurrentTabTag();
@@ -636,25 +654,14 @@ public class DataUsageSummary extends Fragment {
             throw new IllegalStateException("unknown tab: " + currentTab);
         }
 
-        try {
-            // load stats for current template
-            mHistory = mStatsService.getHistoryForNetwork(
-                    mTemplate, FIELD_RX_BYTES | FIELD_TX_BYTES);
-        } catch (RemoteException e) {
-            // since we can't do much without policy or history, and we don't
-            // want to leave with half-baked UI, we bail hard.
-            throw new RuntimeException("problem reading network policy or stats", e);
-        }
-
-        // bind chart to historical stats
-        mChart.bindNetworkStats(mHistory);
+        // kick off loader for network history
+        // TODO: consider chaining two loaders together instead of reloading
+        // network history when showing app detail.
+        getLoaderManager().restartLoader(LOADER_CHART_DATA,
+                ChartDataLoader.buildArgs(mTemplate, mAppDetailUids), mChartDataCallbacks);
 
-        // only update policy when switching tabs
-        updatePolicy(tabChanged);
-        updateAppDetail();
-
-        // force scroll to top of body
-        mListView.smoothScrollToPosition(0);
+        // detail mode can change visible menus, invalidate
+        getActivity().invalidateOptionsMenu();
 
         mBinding = false;
     }
@@ -683,10 +690,6 @@ public class DataUsageSummary extends Fragment {
             mAppDetail.setVisibility(View.GONE);
             mCycleAdapter.setChangeVisible(true);
 
-            mDetailHistory = null;
-            mDetailHistoryDefault = null;
-            mDetailHistoryForeground = null;
-
             // hide detail stats when not in detail mode
             mChart.bindDetailNetworkStats(null);
             return;
@@ -697,7 +700,7 @@ public class DataUsageSummary extends Fragment {
 
         // show icon and all labels appearing under this app
         final int primaryUid = getAppDetailPrimaryUid();
-        final UidDetail detail = resolveDetailForUid(context, primaryUid);
+        final UidDetail detail = mUidDetailProvider.getUidDetail(primaryUid, true);
         mAppIcon.setImageDrawable(detail.icon);
 
         mAppTitles.removeAllViews();
@@ -725,7 +728,6 @@ public class DataUsageSummary extends Fragment {
             mAppSettings.setEnabled(false);
         }
 
-        updateDetailHistory();
         updateDetailData();
 
         if (NetworkPolicyManager.isUidValidForPolicy(context, primaryUid)
@@ -743,54 +745,6 @@ public class DataUsageSummary extends Fragment {
         }
     }
 
-    /**
-     * Update {@link #mDetailHistory} and related values based on
-     * {@link #mAppDetailUids}.
-     */
-    private void updateDetailHistory() {
-        try {
-            mDetailHistoryDefault = null;
-            mDetailHistoryForeground = null;
-
-            // load stats for current uid and template
-            for (int uid : mAppDetailUids) {
-                mDetailHistoryDefault = collectHistoryForUid(
-                        uid, SET_DEFAULT, mDetailHistoryDefault);
-                mDetailHistoryForeground = collectHistoryForUid(
-                        uid, SET_FOREGROUND, mDetailHistoryForeground);
-            }
-        } catch (RemoteException e) {
-            // since we can't do much without history, and we don't want to
-            // leave with half-baked UI, we bail hard.
-            throw new RuntimeException("problem reading network stats", e);
-        }
-
-        mDetailHistory = new NetworkStatsHistory(mDetailHistoryForeground.getBucketDuration());
-        mDetailHistory.recordEntireHistory(mDetailHistoryDefault);
-        mDetailHistory.recordEntireHistory(mDetailHistoryForeground);
-
-        // bind chart to historical stats
-        mChart.bindDetailNetworkStats(mDetailHistory);
-    }
-
-    /**
-     * Collect {@link NetworkStatsHistory} for the requested UID, combining with
-     * an existing {@link NetworkStatsHistory} if provided.
-     */
-    private NetworkStatsHistory collectHistoryForUid(
-            int uid, int set, NetworkStatsHistory existing)
-            throws RemoteException {
-        final NetworkStatsHistory history = mStatsService.getHistoryForUid(
-                mTemplate, uid, set, TAG_NONE, FIELD_RX_BYTES | FIELD_TX_BYTES);
-
-        if (existing != null) {
-            existing.recordEntireHistory(history);
-            return existing;
-        } else {
-            return history;
-        }
-    }
-
     private void setPolicyCycleDay(int cycleDay) {
         if (LOGD) Log.d(TAG, "setPolicyCycleDay()");
         mPolicyEditor.setPolicyCycleDay(mTemplate, cycleDay);
@@ -956,21 +910,22 @@ public class DataUsageSummary extends Fragment {
         mCycleAdapter.clear();
 
         final Context context = mCycleSpinner.getContext();
-        long historyStart = mHistory.getStart();
-        long historyEnd = mHistory.getEnd();
 
-        if (historyStart == Long.MAX_VALUE || historyEnd == Long.MIN_VALUE) {
-            historyStart = System.currentTimeMillis();
-            historyEnd = System.currentTimeMillis();
+        long historyStart = Long.MAX_VALUE;
+        long historyEnd = Long.MIN_VALUE;
+        if (mChartData != null) {
+            historyStart = mChartData.network.getStart();
+            historyEnd = mChartData.network.getEnd();
         }
 
+        if (historyStart == Long.MAX_VALUE) historyStart = System.currentTimeMillis();
+        if (historyEnd == Long.MIN_VALUE) historyEnd = System.currentTimeMillis();
+
         boolean hasCycles = false;
         if (policy != null) {
             // find the next cycle boundary
             long cycleEnd = computeNextCycleBoundary(historyEnd, policy);
 
-            int guardCount = 0;
-
             // walk backwards, generating all valid cycle ranges
             while (cycleEnd > historyStart) {
                 final long cycleStart = computeLastCycleBoundary(cycleEnd, policy);
@@ -979,12 +934,6 @@ public class DataUsageSummary extends Fragment {
                 mCycleAdapter.add(new CycleItem(context, cycleStart, cycleEnd));
                 cycleEnd = cycleStart;
                 hasCycles = true;
-
-                // TODO: remove this guard once we have better testing
-                if (guardCount++ > 50) {
-                    Log.wtf(TAG, "stuck generating ranges for historyStart=" + historyStart
-                            + ", historyEnd=" + historyEnd + " and policy=" + policy);
-                }
             }
 
             // one last cycle entry to modify policy cycle day
@@ -1075,7 +1024,7 @@ public class DataUsageSummary extends Fragment {
         public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
             final Context context = view.getContext();
             final AppUsageItem app = (AppUsageItem) parent.getItemAtPosition(position);
-            final UidDetail detail = resolveDetailForUid(context, app.uids[0]);
+            final UidDetail detail = mUidDetailProvider.getUidDetail(app.uids[0], true);
             AppDetailsFragment.show(DataUsageSummary.this, app.uids, detail.label);
         }
     };
@@ -1128,11 +1077,11 @@ public class DataUsageSummary extends Fragment {
         final Context context = getActivity();
 
         NetworkStatsHistory.Entry entry = null;
-        if (isAppDetailMode() && mDetailHistory != null) {
+        if (isAppDetailMode() && mChartData != null && mChartData.detail != null) {
             // bind foreground/background to piechart and labels
-            entry = mDetailHistoryDefault.getValues(start, end, now, entry);
+            entry = mChartData.detailDefault.getValues(start, end, now, entry);
             final long defaultBytes = entry.rxBytes + entry.txBytes;
-            entry = mDetailHistoryForeground.getValues(start, end, now, entry);
+            entry = mChartData.detailForeground.getValues(start, end, now, entry);
             final long foregroundBytes = entry.rxBytes + entry.txBytes;
 
             mAppPieChart.setOriginAngle(175);
@@ -1147,17 +1096,18 @@ public class DataUsageSummary extends Fragment {
             mAppForeground.setText(Formatter.formatFileSize(context, foregroundBytes));
 
             // and finally leave with summary data for label below
-            entry = mDetailHistory.getValues(start, end, now, null);
+            entry = mChartData.detail.getValues(start, end, now, null);
 
             getLoaderManager().destroyLoader(LOADER_SUMMARY);
 
         } else {
-            entry = mHistory.getValues(start, end, now, null);
+            if (mChartData != null) {
+                entry = mChartData.network.getValues(start, end, now, null);
+            }
 
             // kick off loader for detailed stats
-            // TODO: delay loader until animation is finished
             getLoaderManager().restartLoader(LOADER_SUMMARY,
-                    SummaryForAllUidLoader.buildArgs(mTemplate, start, end), mSummaryForAllUid);
+                    SummaryForAllUidLoader.buildArgs(mTemplate, start, end), mSummaryCallbacks);
         }
 
         final long totalBytes = entry != null ? entry.rxBytes + entry.txBytes : 0;
@@ -1168,7 +1118,38 @@ public class DataUsageSummary extends Fragment {
                 getString(R.string.data_usage_total_during_range, totalPhrase, rangePhrase));
     }
 
-    private final LoaderCallbacks<NetworkStats> mSummaryForAllUid = new LoaderCallbacks<
+    private final LoaderCallbacks<ChartData> mChartDataCallbacks = new LoaderCallbacks<
+            ChartData>() {
+        /** {@inheritDoc} */
+        public Loader<ChartData> onCreateLoader(int id, Bundle args) {
+            return new ChartDataLoader(getActivity(), mStatsService, args);
+        }
+
+        /** {@inheritDoc} */
+        public void onLoadFinished(Loader<ChartData> loader, ChartData data) {
+            mChartData = data;
+            mChart.bindNetworkStats(mChartData.network);
+            mChart.bindDetailNetworkStats(mChartData.detail);
+
+            // calcuate policy cycles based on available data
+            updatePolicy(true);
+            updateAppDetail();
+
+            // force scroll to top of body when showing detail
+            if (mChartData.detail != null) {
+                mListView.smoothScrollToPosition(0);
+            }
+        }
+
+        /** {@inheritDoc} */
+        public void onLoaderReset(Loader<ChartData> loader) {
+            mChartData = null;
+            mChart.bindNetworkStats(null);
+            mChart.bindDetailNetworkStats(null);
+        }
+    };
+
+    private final LoaderCallbacks<NetworkStats> mSummaryCallbacks = new LoaderCallbacks<
             NetworkStats>() {
         /** {@inheritDoc} */
         public Loader<NetworkStats> onCreateLoader(int id, Bundle args) {
@@ -1337,9 +1318,17 @@ public class DataUsageSummary extends Fragment {
      * Adapter of applications, sorted by total usage descending.
      */
     public static class DataUsageAdapter extends BaseAdapter {
+        private final UidDetailProvider mProvider;
+        private final int mInsetSide;
+
         private ArrayList<AppUsageItem> mItems = Lists.newArrayList();
         private long mLargest;
 
+        public DataUsageAdapter(UidDetailProvider provider, int insetSide) {
+            mProvider = checkNotNull(provider);
+            mInsetSide = insetSide;
+        }
+
         /**
          * Bind the given {@link NetworkStats}, or {@code null} to clear list.
          */
@@ -1401,21 +1390,22 @@ public class DataUsageSummary extends Fragment {
             if (convertView == null) {
                 convertView = LayoutInflater.from(parent.getContext()).inflate(
                         R.layout.data_usage_item, parent, false);
+
+                if (mInsetSide > 0) {
+                    convertView.setPadding(mInsetSide, 0, mInsetSide, 0);
+                }
             }
 
             final Context context = parent.getContext();
 
-            final ImageView icon = (ImageView) convertView.findViewById(android.R.id.icon);
-            final TextView title = (TextView) convertView.findViewById(android.R.id.title);
             final TextView text1 = (TextView) convertView.findViewById(android.R.id.text1);
             final ProgressBar progress = (ProgressBar) convertView.findViewById(
                     android.R.id.progress);
 
+            // kick off async load of app details
             final AppUsageItem item = mItems.get(position);
-            final UidDetail detail = resolveDetailForUid(context, item.uids[0]);
+            UidDetailTask.bindView(mProvider, item, convertView);
 
-            icon.setImageDrawable(detail.icon);
-            title.setText(detail.label);
             text1.setText(Formatter.formatFileSize(context, item.total));
 
             final int percentTotal = mLargest != 0 ? (int) (item.total * 100 / mLargest) : 0;
@@ -1745,66 +1735,64 @@ public class DataUsageSummary extends Fragment {
         }
     }
 
-    public static class UidDetail {
-        public CharSequence label;
-        public CharSequence[] detailLabels;
-        public Drawable icon;
-    }
-
     /**
-     * Resolve best descriptive label for the given UID.
+     * Background task that loads {@link UidDetail}, binding to
+     * {@link DataUsageAdapter} row item when finished.
      */
-    public static UidDetail resolveDetailForUid(Context context, int uid) {
-        final Resources res = context.getResources();
-        final PackageManager pm = context.getPackageManager();
-
-        final UidDetail detail = new UidDetail();
-        detail.label = pm.getNameForUid(uid);
-        detail.icon = pm.getDefaultActivityIcon();
+    private static class UidDetailTask extends AsyncTask<Void, Void, UidDetail> {
+        private final UidDetailProvider mProvider;
+        private final AppUsageItem mItem;
+        private final View mTarget;
+
+        private UidDetailTask(UidDetailProvider provider, AppUsageItem item, View target) {
+            mProvider = checkNotNull(provider);
+            mItem = checkNotNull(item);
+            mTarget = checkNotNull(target);
+        }
+
+        public static void bindView(
+                UidDetailProvider provider, AppUsageItem item, View target) {
+            final UidDetailTask existing = (UidDetailTask) target.getTag();
+            if (existing != null) {
+                existing.cancel(false);
+            }
 
-        // handle special case labels
-        switch (uid) {
-            case android.os.Process.SYSTEM_UID:
-                detail.label = res.getString(R.string.process_kernel_label);
-                detail.icon = pm.getDefaultActivityIcon();
-                return detail;
-            case TrafficStats.UID_REMOVED:
-                detail.label = res.getString(R.string.data_usage_uninstalled_apps);
-                detail.icon = pm.getDefaultActivityIcon();
-                return detail;
+            final UidDetail cachedDetail = provider.getUidDetail(item.uids[0], false);
+            if (cachedDetail != null) {
+                bindView(cachedDetail, target);
+            } else {
+                target.setTag(new UidDetailTask(provider, item, target).executeOnExecutor(
+                        AsyncTask.THREAD_POOL_EXECUTOR));
+            }
         }
 
-        // otherwise fall back to using packagemanager labels
-        final String[] packageNames = pm.getPackagesForUid(uid);
-        final int length = packageNames != null ? packageNames.length : 0;
+        private static void bindView(UidDetail detail, View target) {
+            final ImageView icon = (ImageView) target.findViewById(android.R.id.icon);
+            final TextView title = (TextView) target.findViewById(android.R.id.title);
 
-        try {
-            if (length == 1) {
-                final ApplicationInfo info = pm.getApplicationInfo(packageNames[0], 0);
-                detail.label = info.loadLabel(pm).toString();
-                detail.icon = info.loadIcon(pm);
-            } else if (length > 1) {
-                detail.detailLabels = new CharSequence[length];
-                for (int i = 0; i < length; i++) {
-                    final String packageName = packageNames[i];
-                    final PackageInfo packageInfo = pm.getPackageInfo(packageName, 0);
-                    final ApplicationInfo appInfo = pm.getApplicationInfo(packageName, 0);
-
-                    detail.detailLabels[i] = appInfo.loadLabel(pm).toString();
-                    if (packageInfo.sharedUserLabel != 0) {
-                        detail.label = pm.getText(packageName, packageInfo.sharedUserLabel,
-                                packageInfo.applicationInfo).toString();
-                        detail.icon = appInfo.loadIcon(pm);
-                    }
-                }
+            if (detail != null) {
+                icon.setImageDrawable(detail.icon);
+                title.setText(detail.label);
+            } else {
+                icon.setImageDrawable(null);
+                title.setText(null);
             }
-        } catch (NameNotFoundException e) {
         }
 
-        if (TextUtils.isEmpty(detail.label)) {
-            detail.label = Integer.toString(uid);
+        @Override
+        protected void onPreExecute() {
+            bindView(null, mTarget);
+        }
+
+        @Override
+        protected UidDetail doInBackground(Void... params) {
+            return mProvider.getUidDetail(mItem.uids[0], true);
+        }
+
+        @Override
+        protected void onPostExecute(UidDetail result) {
+            bindView(result, mTarget);
         }
-        return detail;
     }
 
     /**
@@ -1827,6 +1815,9 @@ public class DataUsageSummary extends Fragment {
      * Test if device has a mobile 4G data radio.
      */
     private static boolean hasMobile4gRadio(Context context) {
+        if (!NetworkPolicyEditor.ENABLE_SPLIT_POLICIES) {
+            return false;
+        }
         if (TEST_RADIOS) {
             return SystemProperties.get(TEST_RADIOS_PROP).contains("4g");
         }
diff --git a/src/com/android/settings/net/ChartData.java b/src/com/android/settings/net/ChartData.java
new file mode 100644
index 000000000..0b8969e84
--- /dev/null
+++ b/src/com/android/settings/net/ChartData.java
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.net;
+
+import android.net.NetworkStatsHistory;
+
+public class ChartData {
+    public NetworkStatsHistory network;
+
+    public NetworkStatsHistory detail;
+    public NetworkStatsHistory detailDefault;
+    public NetworkStatsHistory detailForeground;
+}
diff --git a/src/com/android/settings/net/ChartDataLoader.java b/src/com/android/settings/net/ChartDataLoader.java
new file mode 100644
index 000000000..09e6e3b6e
--- /dev/null
+++ b/src/com/android/settings/net/ChartDataLoader.java
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.net;
+
+import static android.net.NetworkStats.SET_DEFAULT;
+import static android.net.NetworkStats.SET_FOREGROUND;
+import static android.net.NetworkStats.TAG_NONE;
+import static android.net.NetworkStatsHistory.FIELD_RX_BYTES;
+import static android.net.NetworkStatsHistory.FIELD_TX_BYTES;
+
+import android.content.AsyncTaskLoader;
+import android.content.Context;
+import android.net.INetworkStatsService;
+import android.net.NetworkStatsHistory;
+import android.net.NetworkTemplate;
+import android.os.Bundle;
+import android.os.RemoteException;
+
+/**
+ * Loader for historical chart data for both network and UID details.
+ */
+public class ChartDataLoader extends AsyncTaskLoader<ChartData> {
+    private static final String KEY_TEMPLATE = "template";
+    private static final String KEY_UIDS = "uids";
+    private static final String KEY_FIELDS = "fields";
+
+    private final INetworkStatsService mStatsService;
+    private final Bundle mArgs;
+
+    public static Bundle buildArgs(NetworkTemplate template, int[] uids) {
+        return buildArgs(template, uids, FIELD_RX_BYTES | FIELD_TX_BYTES);
+    }
+
+    public static Bundle buildArgs(NetworkTemplate template, int[] uids, int fields) {
+        final Bundle args = new Bundle();
+        args.putParcelable(KEY_TEMPLATE, template);
+        args.putIntArray(KEY_UIDS, uids);
+        args.putInt(KEY_FIELDS, fields);
+        return args;
+    }
+
+    public ChartDataLoader(Context context, INetworkStatsService statsService, Bundle args) {
+        super(context);
+        mStatsService = statsService;
+        mArgs = args;
+    }
+
+    @Override
+    protected void onStartLoading() {
+        super.onStartLoading();
+        forceLoad();
+    }
+
+    @Override
+    public ChartData loadInBackground() {
+        final NetworkTemplate template = mArgs.getParcelable(KEY_TEMPLATE);
+        final int[] uids = mArgs.getIntArray(KEY_UIDS);
+        final int fields = mArgs.getInt(KEY_FIELDS);
+
+        try {
+            return loadInBackground(template, uids, fields);
+        } catch (RemoteException e) {
+            // since we can't do much without history, and we don't want to
+            // leave with half-baked UI, we bail hard.
+            throw new RuntimeException("problem reading network stats", e);
+        }
+    }
+
+    private ChartData loadInBackground(NetworkTemplate template, int[] uids, int fields)
+            throws RemoteException {
+        final ChartData data = new ChartData();
+        data.network = mStatsService.getHistoryForNetwork(template, fields);
+
+        if (uids != null) {
+            data.detailDefault = null;
+            data.detailForeground = null;
+
+            // load stats for current uid and template
+            for (int uid : uids) {
+                data.detailDefault = collectHistoryForUid(
+                        template, uid, SET_DEFAULT, data.detailDefault);
+                data.detailForeground = collectHistoryForUid(
+                        template, uid, SET_FOREGROUND, data.detailForeground);
+            }
+
+            data.detail = new NetworkStatsHistory(data.detailForeground.getBucketDuration());
+            data.detail.recordEntireHistory(data.detailDefault);
+            data.detail.recordEntireHistory(data.detailForeground);
+        }
+
+        return data;
+    }
+
+    @Override
+    protected void onStopLoading() {
+        super.onStopLoading();
+        cancelLoad();
+    }
+
+    @Override
+    protected void onReset() {
+        super.onReset();
+        cancelLoad();
+    }
+
+    /**
+     * Collect {@link NetworkStatsHistory} for the requested UID, combining with
+     * an existing {@link NetworkStatsHistory} if provided.
+     */
+    private NetworkStatsHistory collectHistoryForUid(
+            NetworkTemplate template, int uid, int set, NetworkStatsHistory existing)
+            throws RemoteException {
+        final NetworkStatsHistory history = mStatsService.getHistoryForUid(
+                template, uid, set, TAG_NONE, FIELD_RX_BYTES | FIELD_TX_BYTES);
+
+        if (existing != null) {
+            existing.recordEntireHistory(history);
+            return existing;
+        } else {
+            return history;
+        }
+    }
+}
diff --git a/src/com/android/settings/net/NetworkPolicyEditor.java b/src/com/android/settings/net/NetworkPolicyEditor.java
index 161e6ee57..bb5a2c37d 100644
--- a/src/com/android/settings/net/NetworkPolicyEditor.java
+++ b/src/com/android/settings/net/NetworkPolicyEditor.java
@@ -36,8 +36,10 @@ import android.text.format.Time;
 
 import com.android.internal.util.Objects;
 import com.google.android.collect.Lists;
+import com.google.android.collect.Sets;
 
 import java.util.ArrayList;
+import java.util.HashSet;
 
 /**
  * Utility class to modify list of {@link NetworkPolicy}. Specifically knows
@@ -46,6 +48,8 @@ import java.util.ArrayList;
 public class NetworkPolicyEditor {
     // TODO: be more robust when missing policies from service
 
+    public static final boolean ENABLE_SPLIT_POLICIES = false;
+
     private INetworkPolicyManager mPolicyService;
     private ArrayList<NetworkPolicy> mPolicies = Lists.newArrayList();
 
@@ -83,6 +87,11 @@ public class NetworkPolicyEditor {
             mPolicies.add(policy);
         }
 
+        // force combine any split policies when disabled
+        if (!ENABLE_SPLIT_POLICIES) {
+            modified |= forceMobilePolicyCombined();
+        }
+
         // when we cleaned policies above, write back changes
         if (modified) writeAsync();
     }
@@ -161,6 +170,22 @@ public class NetworkPolicyEditor {
         writeAsync();
     }
 
+    /**
+     * Remove any split {@link NetworkPolicy}.
+     */
+    private boolean forceMobilePolicyCombined() {
+        final HashSet<String> subscriberIds = Sets.newHashSet();
+        for (NetworkPolicy policy : mPolicies) {
+            subscriberIds.add(policy.template.getSubscriberId());
+        }
+
+        boolean modified = false;
+        for (String subscriberId : subscriberIds) {
+            modified |= setMobilePolicySplitInternal(subscriberId, false);
+        }
+        return modified;
+    }
+
     public boolean isMobilePolicySplit(String subscriberId) {
         boolean has3g = false;
         boolean has4g = false;
@@ -181,6 +206,18 @@ public class NetworkPolicyEditor {
     }
 
     public void setMobilePolicySplit(String subscriberId, boolean split) {
+        if (setMobilePolicySplitInternal(subscriberId, split)) {
+            writeAsync();
+        }
+    }
+
+    /**
+     * Mutate {@link NetworkPolicy} for given subscriber, combining or splitting
+     * the policy as requested.
+     *
+     * @return {@code true} when any {@link NetworkPolicy} was mutated.
+     */
+    private boolean setMobilePolicySplitInternal(String subscriberId, boolean split) {
         final boolean beforeSplit = isMobilePolicySplit(subscriberId);
 
         final NetworkTemplate template3g = buildTemplateMobile3gLower(subscriberId);
@@ -189,7 +226,7 @@ public class NetworkPolicyEditor {
 
         if (split == beforeSplit) {
             // already in requested state; skip
-            return;
+            return false;
 
         } else if (beforeSplit && !split) {
             // combine, picking most restrictive policy
@@ -203,7 +240,7 @@ public class NetworkPolicyEditor {
             mPolicies.add(
                     new NetworkPolicy(templateAll, restrictive.cycleDay, restrictive.warningBytes,
                             restrictive.limitBytes, SNOOZE_NEVER));
-            writeAsync();
+            return true;
 
         } else if (!beforeSplit && split) {
             // duplicate existing policy into two rules
@@ -215,8 +252,9 @@ public class NetworkPolicyEditor {
             mPolicies.add(
                     new NetworkPolicy(template4g, policyAll.cycleDay, policyAll.warningBytes,
                             policyAll.limitBytes, SNOOZE_NEVER));
-            writeAsync();
-
+            return true;
+        } else {
+            return false;
         }
     }
 }
diff --git a/src/com/android/settings/net/UidDetail.java b/src/com/android/settings/net/UidDetail.java
new file mode 100644
index 000000000..fd44d47b8
--- /dev/null
+++ b/src/com/android/settings/net/UidDetail.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.net;
+
+import android.graphics.drawable.Drawable;
+
+public class UidDetail {
+    public CharSequence label;
+    public CharSequence[] detailLabels;
+    public Drawable icon;
+}
diff --git a/src/com/android/settings/net/UidDetailProvider.java b/src/com/android/settings/net/UidDetailProvider.java
new file mode 100644
index 000000000..9eac801fe
--- /dev/null
+++ b/src/com/android/settings/net/UidDetailProvider.java
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.net;
+
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.NameNotFoundException;
+import android.content.res.Resources;
+import android.net.TrafficStats;
+import android.text.TextUtils;
+import android.util.SparseArray;
+
+import com.android.settings.R;
+
+public class UidDetailProvider {
+    private final Context mContext;
+    private final SparseArray<UidDetail> mUidDetailCache;
+
+    public UidDetailProvider(Context context) {
+        mContext = context.getApplicationContext();
+        mUidDetailCache = new SparseArray<UidDetail>();
+    }
+
+    public void clearCache() {
+        mUidDetailCache.clear();
+    }
+
+    /**
+     * Resolve best descriptive label for the given UID.
+     */
+    public UidDetail getUidDetail(int uid, boolean blocking) {
+        final UidDetail cached = mUidDetailCache.get(uid);
+        if (cached != null) {
+            return cached;
+        } else if (!blocking) {
+            return null;
+        }
+
+        final Resources res = mContext.getResources();
+        final PackageManager pm = mContext.getPackageManager();
+
+        final UidDetail detail = new UidDetail();
+        detail.label = pm.getNameForUid(uid);
+        detail.icon = pm.getDefaultActivityIcon();
+
+        // handle special case labels
+        switch (uid) {
+            case android.os.Process.SYSTEM_UID:
+                detail.label = res.getString(R.string.process_kernel_label);
+                detail.icon = pm.getDefaultActivityIcon();
+                mUidDetailCache.put(uid, detail);
+                return detail;
+            case TrafficStats.UID_REMOVED:
+                detail.label = res.getString(R.string.data_usage_uninstalled_apps);
+                detail.icon = pm.getDefaultActivityIcon();
+                mUidDetailCache.put(uid, detail);
+                return detail;
+        }
+
+        // otherwise fall back to using packagemanager labels
+        final String[] packageNames = pm.getPackagesForUid(uid);
+        final int length = packageNames != null ? packageNames.length : 0;
+
+        try {
+            if (length == 1) {
+                final ApplicationInfo info = pm.getApplicationInfo(packageNames[0], 0);
+                detail.label = info.loadLabel(pm).toString();
+                detail.icon = info.loadIcon(pm);
+            } else if (length > 1) {
+                detail.detailLabels = new CharSequence[length];
+                for (int i = 0; i < length; i++) {
+                    final String packageName = packageNames[i];
+                    final PackageInfo packageInfo = pm.getPackageInfo(packageName, 0);
+                    final ApplicationInfo appInfo = pm.getApplicationInfo(packageName, 0);
+
+                    detail.detailLabels[i] = appInfo.loadLabel(pm).toString();
+                    if (packageInfo.sharedUserLabel != 0) {
+                        detail.label = pm.getText(packageName, packageInfo.sharedUserLabel,
+                                packageInfo.applicationInfo).toString();
+                        detail.icon = appInfo.loadIcon(pm);
+                    }
+                }
+            }
+        } catch (NameNotFoundException e) {
+        }
+
+        if (TextUtils.isEmpty(detail.label)) {
+            detail.label = Integer.toString(uid);
+        }
+
+        mUidDetailCache.put(uid, detail);
+        return detail;
+    }
+}
diff --git a/src/com/android/settings/widget/ChartAxis.java b/src/com/android/settings/widget/ChartAxis.java
index d3d499c7b..515fe6634 100644
--- a/src/com/android/settings/widget/ChartAxis.java
+++ b/src/com/android/settings/widget/ChartAxis.java
@@ -26,9 +26,9 @@ import android.text.SpannableStringBuilder;
 public interface ChartAxis {
 
     /** Set range of raw values this axis should cover. */
-    public void setBounds(long min, long max);
+    public boolean setBounds(long min, long max);
     /** Set range of screen points this axis should cover. */
-    public void setSize(float size);
+    public boolean setSize(float size);
 
     /** Convert raw value into screen point. */
     public float convertToPoint(long value);
diff --git a/src/com/android/settings/widget/ChartDataUsageView.java b/src/com/android/settings/widget/ChartDataUsageView.java
index cb9c8d7fe..e831cc151 100644
--- a/src/com/android/settings/widget/ChartDataUsageView.java
+++ b/src/com/android/settings/widget/ChartDataUsageView.java
@@ -30,6 +30,7 @@ import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;
 
+import com.android.internal.util.Objects;
 import com.android.settings.R;
 import com.android.settings.widget.ChartSweepView.OnSweepListener;
 
@@ -214,7 +215,8 @@ public class ChartDataUsageView extends ChartView {
 
         // always show known data and policy lines
         final long maxSweep = Math.max(mSweepWarning.getValue(), mSweepLimit.getValue());
-        final long maxVisible = Math.max(mSeries.getMaxVisible(), maxSweep) * 12 / 10;
+        final long maxSeries = Math.max(mSeries.getMaxVisible(), mDetailSeries.getMaxVisible());
+        final long maxVisible = Math.max(maxSeries, maxSweep) * 12 / 10;
         final long maxDefault = Math.max(maxVisible, 2 * GB_IN_BYTES);
         newMax = Math.max(maxDefault, newMax);
 
@@ -222,12 +224,14 @@ public class ChartDataUsageView extends ChartView {
         if (newMax != mVertMax) {
             mVertMax = newMax;
 
-            mVert.setBounds(0L, newMax);
+            final boolean changed = mVert.setBounds(0L, newMax);
             mSweepWarning.setValidRange(0L, newMax);
             mSweepLimit.setValidRange(0L, newMax);
 
-            mSeries.generatePath();
-            mDetailSeries.generatePath();
+            if (changed) {
+                mSeries.invalidatePath();
+                mDetailSeries.invalidatePath();
+            }
 
             mGrid.invalidate();
 
@@ -263,6 +267,10 @@ public class ChartDataUsageView extends ChartView {
             interestLine = mSweepLimit.getValue();
         }
 
+        if (interestLine < 0) {
+            interestLine = Long.MAX_VALUE;
+        }
+
         final boolean estimateVisible = (maxEstimate >= interestLine * 7 / 10);
         mSeries.setEstimateVisible(estimateVisible);
     }
@@ -354,8 +362,10 @@ public class ChartDataUsageView extends ChartView {
      * last "week" of available data, without triggering listener events.
      */
     public void setVisibleRange(long visibleStart, long visibleEnd) {
-        mHoriz.setBounds(visibleStart, visibleEnd);
+        final boolean changed = mHoriz.setBounds(visibleStart, visibleEnd);
         mGrid.setBounds(visibleStart, visibleEnd);
+        mSeries.setBounds(visibleStart, visibleEnd);
+        mDetailSeries.setBounds(visibleStart, visibleEnd);
 
         final long validStart = Math.max(visibleStart, getStatsStart());
         final long validEnd = Math.min(visibleEnd, getStatsEnd());
@@ -378,7 +388,10 @@ public class ChartDataUsageView extends ChartView {
         mSweepRight.setValue(sweepMax);
 
         requestLayout();
-        mSeries.generatePath();
+        if (changed) {
+            mSeries.invalidatePath();
+            mDetailSeries.invalidatePath();
+        }
 
         updateVertAxisBounds(null);
         updateEstimateVisible();
@@ -410,15 +423,30 @@ public class ChartDataUsageView extends ChartView {
             setBounds(currentTime - DateUtils.DAY_IN_MILLIS * 30, currentTime);
         }
 
+        @Override
+        public int hashCode() {
+            return Objects.hashCode(mMin, mMax, mSize);
+        }
+
         /** {@inheritDoc} */
-        public void setBounds(long min, long max) {
-            mMin = min;
-            mMax = max;
+        public boolean setBounds(long min, long max) {
+            if (mMin != min || mMax != max) {
+                mMin = min;
+                mMax = max;
+                return true;
+            } else {
+                return false;
+            }
         }
 
         /** {@inheritDoc} */
-        public void setSize(float size) {
-            this.mSize = size;
+        public boolean setSize(float size) {
+            if (mSize != size) {
+                mSize = size;
+                return true;
+            } else {
+                return false;
+            }
         }
 
         /** {@inheritDoc} */
@@ -461,15 +489,30 @@ public class ChartDataUsageView extends ChartView {
         private long mMax;
         private float mSize;
 
+        @Override
+        public int hashCode() {
+            return Objects.hashCode(mMin, mMax, mSize);
+        }
+
         /** {@inheritDoc} */
-        public void setBounds(long min, long max) {
-            mMin = min;
-            mMax = max;
+        public boolean setBounds(long min, long max) {
+            if (mMin != min || mMax != max) {
+                mMin = min;
+                mMax = max;
+                return true;
+            } else {
+                return false;
+            }
         }
 
         /** {@inheritDoc} */
-        public void setSize(float size) {
-            mSize = size;
+        public boolean setSize(float size) {
+            if (mSize != size) {
+                mSize = size;
+                return true;
+            } else {
+                return false;
+            }
         }
 
         /** {@inheritDoc} */
diff --git a/src/com/android/settings/widget/ChartNetworkSeriesView.java b/src/com/android/settings/widget/ChartNetworkSeriesView.java
index f0ccc1bd9..c4f45b0ac 100644
--- a/src/com/android/settings/widget/ChartNetworkSeriesView.java
+++ b/src/com/android/settings/widget/ChartNetworkSeriesView.java
@@ -58,12 +58,16 @@ public class ChartNetworkSeriesView extends View {
     private Path mPathFill;
     private Path mPathEstimate;
 
+    private long mStart;
+    private long mEnd;
+
     private long mPrimaryLeft;
     private long mPrimaryRight;
 
     /** Series will be extended to reach this end time. */
     private long mEndTime = Long.MIN_VALUE;
 
+    private boolean mPathValid = false;
     private boolean mEstimateVisible = false;
 
     private long mMax;
@@ -130,13 +134,15 @@ public class ChartNetworkSeriesView extends View {
 
     public void bindNetworkStats(NetworkStatsHistory stats) {
         mStats = stats;
-
-        mPathStroke.reset();
-        mPathFill.reset();
-        mPathEstimate.reset();
+        invalidatePath();
         invalidate();
     }
 
+    public void setBounds(long start, long end) {
+        mStart = start;
+        mEnd = end;
+    }
+
     /**
      * Set the range to paint with {@link #mPaintFill}, leaving the remaining
      * area to be painted with {@link #mPaintFillSecondary}.
@@ -147,26 +153,27 @@ public class ChartNetworkSeriesView extends View {
         invalidate();
     }
 
-    @Override
-    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
-        generatePath();
+    public void invalidatePath() {
+        mPathValid = false;
+        mMax = 0;
+        invalidate();
     }
 
     /**
      * Erase any existing {@link Path} and generate series outline based on
      * currently bound {@link NetworkStatsHistory} data.
      */
-    public void generatePath() {
+    private void generatePath() {
         if (LOGD) Log.d(TAG, "generatePath()");
 
         mMax = 0;
         mPathStroke.reset();
         mPathFill.reset();
         mPathEstimate.reset();
+        mPathValid = true;
 
         // bail when not enough stats to render
         if (mStats == null || mStats.size() < 2) {
-            invalidate();
             return;
         }
 
@@ -185,7 +192,10 @@ public class ChartNetworkSeriesView extends View {
         long totalData = 0;
 
         NetworkStatsHistory.Entry entry = null;
-        for (int i = 0; i < mStats.size(); i++) {
+
+        final int start = mStats.getIndexBefore(mStart);
+        final int end = mStats.getIndexAfter(mEnd);
+        for (int i = start; i <= end; i++) {
             entry = mStats.getValues(i, entry);
 
             lastTime = entry.bucketStart + entry.bucketDuration;
@@ -206,9 +216,6 @@ public class ChartNetworkSeriesView extends View {
                 totalData += entry.rxBytes + entry.txBytes;
             }
 
-            // skip if beyond view
-            if (x > width) break;
-
             lastX = x;
             lastY = y;
         }
@@ -284,13 +291,24 @@ public class ChartNetworkSeriesView extends View {
     }
 
     public long getMaxVisible() {
-        return mEstimateVisible ? mMaxEstimate : mMax;
+        final long maxVisible = mEstimateVisible ? mMaxEstimate : mMax;
+        if (maxVisible <= 0 && mStats != null) {
+            // haven't generated path yet; fall back to raw data
+            final NetworkStatsHistory.Entry entry = mStats.getValues(mStart, mEnd, null);
+            return entry.rxBytes + entry.txBytes;
+        } else {
+            return maxVisible;
+        }
     }
 
     @Override
     protected void onDraw(Canvas canvas) {
         int save;
 
+        if (!mPathValid) {
+            generatePath();
+        }
+
         final float primaryLeftPoint = mHoriz.convertToPoint(mPrimaryLeft);
         final float primaryRightPoint = mHoriz.convertToPoint(mPrimaryRight);
 
diff --git a/src/com/android/settings/widget/ChartSweepView.java b/src/com/android/settings/widget/ChartSweepView.java
index 7b6d88754..2190588b2 100644
--- a/src/com/android/settings/widget/ChartSweepView.java
+++ b/src/com/android/settings/widget/ChartSweepView.java
@@ -76,6 +76,8 @@ public class ChartSweepView extends View {
     private ChartSweepView mValidAfterDynamic;
     private ChartSweepView mValidBeforeDynamic;
 
+    private float mLabelOffset;
+
     private Paint mOutlinePaint = new Paint();
 
     public static final int HORIZONTAL = 0;
@@ -230,12 +232,44 @@ public class ChartSweepView extends View {
     private void invalidateLabel() {
         if (mLabelTemplate != null && mAxis != null) {
             mLabelValue = mAxis.buildLabel(getResources(), mLabelTemplate, mValue);
+            invalidateLabelOffset();
             invalidate();
         } else {
             mLabelValue = mValue;
         }
     }
 
+    /**
+     * When overlapping with neighbor, split difference and push label.
+     */
+    public void invalidateLabelOffset() {
+        float margin;
+        float labelOffset = 0;
+        if (mFollowAxis == VERTICAL) {
+            if (mValidAfterDynamic != null) {
+                margin = getLabelTop(mValidAfterDynamic) - getLabelBottom(this);
+                if (margin < 0) {
+                    labelOffset = margin / 2;
+                }
+            } else if (mValidBeforeDynamic != null) {
+                margin = getLabelTop(this) - getLabelBottom(mValidBeforeDynamic);
+                if (margin < 0) {
+                    labelOffset = -margin / 2;
+                }
+            }
+        } else {
+            // TODO: implement horizontal labels
+        }
+
+        // when offsetting label, neighbor probably needs to offset too
+        if (labelOffset != mLabelOffset) {
+            mLabelOffset = labelOffset;
+            invalidate();
+            if (mValidAfterDynamic != null) mValidAfterDynamic.invalidateLabelOffset();
+            if (mValidBeforeDynamic != null) mValidBeforeDynamic.invalidateLabelOffset();
+        }
+    }
+
     @Override
     public void jumpDrawablesToCurrentState() {
         super.jumpDrawablesToCurrentState();
@@ -567,6 +601,12 @@ public class ChartSweepView extends View {
     }
 
     @Override
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+        super.onLayout(changed, left, top, right, bottom);
+        invalidateLabelOffset();
+    }
+
+    @Override
     protected void onDraw(Canvas canvas) {
         final int width = getWidth();
         final int height = getHeight();
@@ -575,36 +615,11 @@ public class ChartSweepView extends View {
             canvas.drawRect(0, 0, width, height, mOutlinePaint);
         }
 
-        // when overlapping with neighbor, split difference and push label
-        float margin;
-        float labelOffset = 0;
-        if (mFollowAxis == VERTICAL) {
-            if (mValidAfterDynamic != null) {
-                margin = getLabelTop(mValidAfterDynamic) - getLabelBottom(this);
-                if (margin < 0) {
-                    labelOffset = margin / 2;
-                }
-            } else if (mValidBeforeDynamic != null) {
-                margin = getLabelTop(this) - getLabelBottom(mValidBeforeDynamic);
-                if (margin < 0) {
-                    labelOffset = -margin / 2;
-                }
-            }
-        } else {
-            // TODO: implement horizontal labels
-        }
-
-        // when offsetting label, neighbor probably needs to offset too
-        if (labelOffset != 0) {
-            if (mValidAfterDynamic != null) mValidAfterDynamic.invalidate();
-            if (mValidBeforeDynamic != null) mValidBeforeDynamic.invalidate();
-        }
-
         final int labelSize;
         if (isEnabled() && mLabelLayout != null) {
             final int count = canvas.save();
             {
-                canvas.translate(mContentOffset.left, mContentOffset.top + labelOffset);
+                canvas.translate(mContentOffset.left, mContentOffset.top + mLabelOffset);
                 mLabelLayout.draw(canvas);
             }
             canvas.restoreToCount(count);
diff --git a/src/com/android/settings/widget/InvertedChartAxis.java b/src/com/android/settings/widget/InvertedChartAxis.java
index 7dcc78a02..2d820d972 100644
--- a/src/com/android/settings/widget/InvertedChartAxis.java
+++ b/src/com/android/settings/widget/InvertedChartAxis.java
@@ -31,14 +31,14 @@ public class InvertedChartAxis implements ChartAxis {
     }
 
     /** {@inheritDoc} */
-    public void setBounds(long min, long max) {
-        mWrapped.setBounds(min, max);
+    public boolean setBounds(long min, long max) {
+        return mWrapped.setBounds(min, max);
     }
 
     /** {@inheritDoc} */
-    public void setSize(float size) {
+    public boolean setSize(float size) {
         mSize = size;
-        mWrapped.setSize(size);
+        return mWrapped.setSize(size);
     }
 
     /** {@inheritDoc} */
diff --git a/src/com/android/settings/widget/PieChartView.java b/src/com/android/settings/widget/PieChartView.java
index 85d45a259..6765733eb 100644
--- a/src/com/android/settings/widget/PieChartView.java
+++ b/src/com/android/settings/widget/PieChartView.java
@@ -40,7 +40,7 @@ import java.util.ArrayList;
  */
 public class PieChartView extends View {
     public static final String TAG = "PieChartView";
-    public static final boolean LOGD = true;
+    public static final boolean LOGD = false;
 
     private ArrayList<Slice> mSlices = Lists.newArrayList();