Checkpoint of data usage UI, graphs and lists.

Chart of network usage over time, with draggable "sweep" bars for
inspection region and warning/limits.  Talks with NetworkStatsService
for live data, and updates list of application usage as inspection
region changes.

Change-Id: I2a406e6776daf7d74143c07ec683c10fe711c277

src/com/android/settings/DataUsageSummary.java

@@ -0,0 +1,353 @@
+/*
+ * 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;
+
+import static com.android.settings.widget.ChartView.buildChartParams;
+import static com.android.settings.widget.ChartView.buildSweepParams;
+
+import android.app.Fragment;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.graphics.Color;
+import android.net.INetworkStatsService;
+import android.net.NetworkStats;
+import android.net.NetworkStatsHistory;
+import android.net.TrafficStats;
+import android.os.Bundle;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.text.format.DateUtils;
+import android.text.format.Formatter;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+import android.widget.ListView;
+import android.widget.TextView;
+
+import com.android.settings.widget.ChartAxis;
+import com.android.settings.widget.ChartGridView;
+import com.android.settings.widget.ChartNetworkSeriesView;
+import com.android.settings.widget.ChartSweepView;
+import com.android.settings.widget.ChartSweepView.OnSweepListener;
+import com.android.settings.widget.ChartView;
+import com.android.settings.widget.InvertedChartAxis;
+import com.google.android.collect.Lists;
+
+import java.util.ArrayList;
+import java.util.Collections;
+
+public class DataUsageSummary extends Fragment {
+    private static final String TAG = "DataUsage";
+
+    // TODO: teach about wifi-vs-mobile data with tabs
+
+    private static final long KB_IN_BYTES = 1024;
+    private static final long MB_IN_BYTES = KB_IN_BYTES * 1024;
+    private static final long GB_IN_BYTES = MB_IN_BYTES * 1024;
+
+    private INetworkStatsService mStatsService;
+
+    private ViewGroup mChartContainer;
+    private ListView mList;
+
+    private ChartAxis mAxisTime;
+    private ChartAxis mAxisData;
+
+    private ChartView mChart;
+    private ChartNetworkSeriesView mSeries;
+
+    private ChartSweepView mSweepTime1;
+    private ChartSweepView mSweepTime2;
+    private ChartSweepView mSweepDataWarn;
+    private ChartSweepView mSweepDataLimit;
+
+    private DataUsageAdapter mAdapter;
+
+    // TODO: persist warning/limit into policy service
+    private static final long DATA_WARN = (long) 3.2 * GB_IN_BYTES;
+    private static final long DATA_LIMIT = (long) 4.8 * GB_IN_BYTES;
+
+    @Override
+    public View onCreateView(
+            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+
+        final Context context = inflater.getContext();
+        final long now = System.currentTimeMillis();
+
+        mStatsService = INetworkStatsService.Stub.asInterface(
+                ServiceManager.getService(Context.NETWORK_STATS_SERVICE));
+
+        mAxisTime = new TimeAxis();
+        mAxisData = new InvertedChartAxis(new DataAxis());
+
+        mChart = new ChartView(context, mAxisTime, mAxisData);
+        mChart.setPadding(20, 20, 20, 20);
+
+        mChart.addView(new ChartGridView(context, mAxisTime, mAxisData), buildChartParams());
+
+        mSeries = new ChartNetworkSeriesView(context, mAxisTime, mAxisData);
+        mChart.addView(mSeries, buildChartParams());
+
+        mSweepTime1 = new ChartSweepView(context, mAxisTime, now - DateUtils.DAY_IN_MILLIS * 14,
+                Color.parseColor("#ffffff"));
+        mSweepTime2 = new ChartSweepView(context, mAxisTime, now - DateUtils.DAY_IN_MILLIS * 7,
+                Color.parseColor("#ffffff"));
+        mSweepDataWarn = new ChartSweepView(
+                context, mAxisData, DATA_WARN, Color.parseColor("#f7931d"));
+        mSweepDataLimit = new ChartSweepView(
+                context, mAxisData, DATA_LIMIT, Color.parseColor("#be1d2c"));
+
+        mChart.addView(mSweepTime1, buildSweepParams());
+        mChart.addView(mSweepTime2, buildSweepParams());
+        mChart.addView(mSweepDataWarn, buildSweepParams());
+        mChart.addView(mSweepDataLimit, buildSweepParams());
+
+        mSeries.bindSweepRange(mSweepTime1, mSweepTime2);
+
+        mSweepTime1.addOnSweepListener(mSweepListener);
+        mSweepTime2.addOnSweepListener(mSweepListener);
+
+        mAdapter = new DataUsageAdapter();
+
+        final View view = inflater.inflate(R.layout.data_usage_summary, container, false);
+
+        mChartContainer = (ViewGroup) view.findViewById(R.id.chart_container);
+        mChartContainer.addView(mChart);
+
+        mList = (ListView) view.findViewById(R.id.list);
+        mList.setAdapter(mAdapter);
+
+        return view;
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        updateSummaryData();
+        updateDetailData();
+
+    }
+
+    private void updateSummaryData() {
+        try {
+            final NetworkStatsHistory history = mStatsService.getHistoryForNetwork(
+                    TrafficStats.TEMPLATE_MOBILE_ALL);
+            mSeries.bindNetworkStats(history);
+        } catch (RemoteException e) {
+            Log.w(TAG, "problem reading stats");
+        }
+    }
+
+    private void updateDetailData() {
+        final long sweep1 = mSweepTime1.getValue();
+        final long sweep2 = mSweepTime2.getValue();
+
+        final long start = Math.min(sweep1, sweep2);
+        final long end = Math.max(sweep1, sweep2);
+
+        try {
+            final NetworkStats stats = mStatsService.getSummaryForAllUid(
+                    start, end, TrafficStats.TEMPLATE_MOBILE_ALL);
+            mAdapter.bindStats(stats);
+        } catch (RemoteException e) {
+            Log.w(TAG, "problem reading stats");
+        }
+    }
+
+    private OnSweepListener mSweepListener = new OnSweepListener() {
+        public void onSweep(ChartSweepView sweep, boolean sweepDone) {
+            // always update graph clip region
+            mSeries.invalidate();
+
+            // update detail list only when done sweeping
+            if (sweepDone) {
+                updateDetailData();
+            }
+        }
+    };
+
+
+    /**
+     * Adapter of applications, sorted by total usage descending.
+     */
+    public static class DataUsageAdapter extends BaseAdapter {
+        private ArrayList<UsageRecord> mData = Lists.newArrayList();
+
+        private static class UsageRecord implements Comparable<UsageRecord> {
+            public int uid;
+            public long total;
+
+            /** {@inheritDoc} */
+            public int compareTo(UsageRecord another) {
+                return Long.compare(another.total, total);
+            }
+        }
+
+        public void bindStats(NetworkStats stats) {
+            mData.clear();
+
+            for (int i = 0; i < stats.length(); i++) {
+                final UsageRecord record = new UsageRecord();
+                record.uid = stats.uid[i];
+                record.total = stats.rx[i] + stats.tx[i];
+                mData.add(record);
+            }
+
+            Collections.sort(mData);
+            notifyDataSetChanged();
+        }
+
+        @Override
+        public int getCount() {
+            return mData.size();
+        }
+
+        @Override
+        public Object getItem(int position) {
+            return mData.get(position);
+        }
+
+        @Override
+        public long getItemId(int position) {
+            return position;
+        }
+
+        @Override
+        public View getView(int position, View convertView, ViewGroup parent) {
+            if (convertView == null) {
+                convertView = LayoutInflater.from(parent.getContext()).inflate(
+                        android.R.layout.simple_list_item_2, parent, false);
+            }
+
+            final Context context = parent.getContext();
+            final PackageManager pm = context.getPackageManager();
+
+            final TextView text1 = (TextView) convertView.findViewById(android.R.id.text1);
+            final TextView text2 = (TextView) convertView.findViewById(android.R.id.text2);
+
+            final UsageRecord record = mData.get(position);
+            text1.setText(pm.getNameForUid(record.uid));
+            text2.setText(Formatter.formatFileSize(context, record.total));
+
+            return convertView;
+        }
+
+    }
+
+
+    public static class TimeAxis implements ChartAxis {
+        private static final long TICK_INTERVAL = DateUtils.DAY_IN_MILLIS * 7;
+
+        private long mMin;
+        private long mMax;
+        private float mSize;
+
+        public TimeAxis() {
+            // TODO: hook up these ranges to policy service
+            mMax = System.currentTimeMillis();
+            mMin = mMax - DateUtils.DAY_IN_MILLIS * 30;
+        }
+
+        /** {@inheritDoc} */
+        public void setSize(float size) {
+            this.mSize = size;
+        }
+
+        /** {@inheritDoc} */
+        public float convertToPoint(long value) {
+            return (mSize * (value - mMin)) / (mMax - mMin);
+        }
+
+        /** {@inheritDoc} */
+        public long convertToValue(float point) {
+            return (long) (mMin + ((point * (mMax - mMin)) / mSize));
+        }
+
+        /** {@inheritDoc} */
+        public CharSequence getLabel(long value) {
+            // TODO: convert to string
+            return Long.toString(value);
+        }
+
+        /** {@inheritDoc} */
+        public float[] getTickPoints() {
+            // tick mark for every week
+            final int tickCount = (int) ((mMax - mMin) / TICK_INTERVAL);
+            final float[] tickPoints = new float[tickCount];
+            for (int i = 0; i < tickCount; i++) {
+                tickPoints[i] = convertToPoint(mMax - (TICK_INTERVAL * i));
+            }
+            return tickPoints;
+        }
+
+    }
+
+    // TODO: make data axis log-scale
+
+    public static class DataAxis implements ChartAxis {
+        private long mMin;
+        private long mMax;
+        private float mSize;
+
+        public DataAxis() {
+            // TODO: adapt ranges to show when history >5GB, and handle 4G
+            // interfaces with higher limits.
+            mMin = 0;
+            mMax = 5 * GB_IN_BYTES;
+        }
+
+        /** {@inheritDoc} */
+        public void setSize(float size) {
+            this.mSize = size;
+        }
+
+        /** {@inheritDoc} */
+        public float convertToPoint(long value) {
+            return (mSize * (value - mMin)) / (mMax - mMin);
+        }
+
+        /** {@inheritDoc} */
+        public long convertToValue(float point) {
+            return (long) (mMin + ((point * (mMax - mMin)) / mSize));
+        }
+
+        /** {@inheritDoc} */
+        public CharSequence getLabel(long value) {
+            // TODO: convert to string
+            return Long.toString(value);
+        }
+
+        /** {@inheritDoc} */
+        public float[] getTickPoints() {
+            final float[] tickPoints = new float[16];
+
+            long value = mMax;
+            float mult = 0.8f;
+            for (int i = 0; i < tickPoints.length; i++) {
+                tickPoints[i] = convertToPoint(value);
+                value = (long) (value * mult);
+                mult *= 0.9;
+            }
+            return tickPoints;
+        }
+    }
+
+
+}

src/com/android/settings/Settings.java

@@ -343,4 +343,5 @@ public class Settings extends PreferenceActivity implements ButtonBarHandler {
     public static class AccountSyncSettingsInAddAccountActivity extends Settings { }
     public static class CryptKeeperSettingsActivity extends Settings { }
     public static class DeviceAdminSettingsActivity extends Settings { }
+    public static class DataUsageSummaryActivity extends Settings { }
 }

src/com/android/settings/widget/ChartAxis.java

@@ -0,0 +1,34 @@
+/*
+ * 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.widget;
+
+/**
+ * Axis along a {@link ChartView} that knows how to convert between raw point
+ * and screen coordinate systems.
+ */
+public interface ChartAxis {
+
+    public void setSize(float size);
+
+    public float convertToPoint(long value);
+    public long convertToValue(float point);
+
+    public CharSequence getLabel(long value);
+
+    public float[] getTickPoints();
+
+}

src/com/android/settings/widget/ChartGridView.java

@@ -0,0 +1,79 @@
+/*
+ * 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.widget;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Paint.Style;
+import android.view.View;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * Background of {@link ChartView} that renders grid lines as requested by
+ * {@link ChartAxis#getTickPoints()}.
+ */
+public class ChartGridView extends View {
+
+    private final ChartAxis mHoriz;
+    private final ChartAxis mVert;
+
+    private final Paint mPaintHoriz;
+    private final Paint mPaintVert;
+
+    public ChartGridView(Context context, ChartAxis horiz, ChartAxis vert) {
+        super(context);
+
+        mHoriz = Preconditions.checkNotNull(horiz, "missing horiz");
+        mVert = Preconditions.checkNotNull(vert, "missing vert");
+
+        setWillNotDraw(false);
+
+        // TODO: convert these colors to resources
+        mPaintHoriz = new Paint();
+        mPaintHoriz.setColor(Color.parseColor("#667bb5"));
+        mPaintHoriz.setStrokeWidth(2.0f);
+        mPaintHoriz.setStyle(Style.STROKE);
+        mPaintHoriz.setAntiAlias(true);
+
+        mPaintVert = new Paint();
+        mPaintVert.setColor(Color.parseColor("#28262c"));
+        mPaintVert.setStrokeWidth(1.0f);
+        mPaintVert.setStyle(Style.STROKE);
+        mPaintVert.setAntiAlias(true);
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        final int width = getWidth();
+        final int height = getHeight();
+
+        final float[] vertTicks = mVert.getTickPoints();
+        for (float y : vertTicks) {
+            canvas.drawLine(0, y, width, y, mPaintVert);
+        }
+
+        final float[] horizTicks = mHoriz.getTickPoints();
+        for (float x : horizTicks) {
+            canvas.drawLine(x, 0, x, height, mPaintHoriz);
+        }
+
+        canvas.drawRect(0, 0, width, height, mPaintHoriz);
+    }
+}

src/com/android/settings/widget/ChartNetworkSeriesView.java

@@ -0,0 +1,183 @@
+/*
+ * 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.widget;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Paint.Style;
+import android.graphics.Path;
+import android.graphics.RectF;
+import android.net.NetworkStatsHistory;
+import android.util.Log;
+import android.view.View;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * {@link NetworkStatsHistory} series to render inside a {@link ChartView},
+ * using {@link ChartAxis} to map into screen coordinates.
+ */
+public class ChartNetworkSeriesView extends View {
+    private static final String TAG = "ChartNetworkSeriesView";
+    private static final boolean LOGD = false;
+
+    private final ChartAxis mHoriz;
+    private final ChartAxis mVert;
+
+    private final Paint mPaintStroke;
+    private final Paint mPaintFill;
+    private final Paint mPaintFillDisabled;
+
+    private NetworkStatsHistory mStats;
+
+    private Path mPathStroke;
+    private Path mPathFill;
+
+    private ChartSweepView mSweep1;
+    private ChartSweepView mSweep2;
+
+    public ChartNetworkSeriesView(Context context, ChartAxis horiz, ChartAxis vert) {
+        super(context);
+
+        mHoriz = Preconditions.checkNotNull(horiz, "missing horiz");
+        mVert = Preconditions.checkNotNull(vert, "missing vert");
+
+        mPaintStroke = new Paint();
+        mPaintStroke.setStrokeWidth(6.0f);
+        mPaintStroke.setColor(Color.parseColor("#24aae1"));
+        mPaintStroke.setStyle(Style.STROKE);
+        mPaintStroke.setAntiAlias(true);
+
+        mPaintFill = new Paint();
+        mPaintFill.setColor(Color.parseColor("#c050ade5"));
+        mPaintFill.setStyle(Style.FILL);
+        mPaintFill.setAntiAlias(true);
+
+        mPaintFillDisabled = new Paint();
+        mPaintFillDisabled.setColor(Color.parseColor("#88566abc"));
+        mPaintFillDisabled.setStyle(Style.FILL);
+        mPaintFillDisabled.setAntiAlias(true);
+
+        mPathStroke = new Path();
+        mPathFill = new Path();
+    }
+
+    public void bindNetworkStats(NetworkStatsHistory stats) {
+        mStats = stats;
+    }
+
+    public void bindSweepRange(ChartSweepView sweep1, ChartSweepView sweep2) {
+        // TODO: generalize to support vertical sweeps
+        // TODO: enforce that both sweeps are along same dimension
+
+        mSweep1 = Preconditions.checkNotNull(sweep1, "missing sweep1");
+        mSweep2 = Preconditions.checkNotNull(sweep2, "missing sweep2");
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+        generatePath();
+    }
+
+    /**
+     * Erase any existing {@link Path} and generate series outline based on
+     * currently bound {@link NetworkStatsHistory} data.
+     */
+    private void generatePath() {
+        mPathStroke.reset();
+        mPathFill.reset();
+
+        // bail when not enough stats to render
+        if (mStats == null || mStats.bucketCount < 2) return;
+
+        final int width = getWidth();
+        final int height = getHeight();
+
+        boolean started = false;
+        float firstX = 0;
+        float lastX = 0;
+        float lastY = 0;
+
+        long totalData = 0;
+
+        for (int i = 0; i < mStats.bucketCount; i++) {
+            final float x = mHoriz.convertToPoint(mStats.bucketStart[i]);
+            final float y = mVert.convertToPoint(totalData);
+
+            // skip until we find first stats on screen
+            if (i > 0 && !started && x > 0) {
+                mPathStroke.moveTo(lastX, lastY);
+                mPathFill.moveTo(lastX, lastY);
+                started = true;
+                firstX = x;
+            }
+
+            if (started) {
+                mPathStroke.lineTo(x, y);
+                mPathFill.lineTo(x, y);
+                totalData += mStats.rx[i] + mStats.tx[i];
+            }
+
+            // skip if beyond view
+            if (x > width) break;
+
+            lastX = x;
+            lastY = y;
+        }
+
+        if (LOGD) {
+            final RectF bounds = new RectF();
+            mPathFill.computeBounds(bounds, true);
+            Log.d(TAG, "onLayout() rendered with bounds=" + bounds.toString());
+        }
+
+        // drop to bottom of graph from current location
+        mPathFill.lineTo(lastX, height);
+        mPathFill.lineTo(firstX, height);
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+
+        // clip to sweep area
+        final float sweep1 = mSweep1.getPoint();
+        final float sweep2 = mSweep2.getPoint();
+        final float sweepLeft = Math.min(sweep1, sweep2);
+        final float sweepRight = Math.max(sweep1, sweep2);
+
+        int save;
+
+        save = canvas.save();
+        canvas.clipRect(0, 0, sweepLeft, getHeight());
+        canvas.drawPath(mPathFill, mPaintFillDisabled);
+        canvas.restoreToCount(save);
+
+        save = canvas.save();
+        canvas.clipRect(sweepRight, 0, getWidth(), getHeight());
+        canvas.drawPath(mPathFill, mPaintFillDisabled);
+        canvas.restoreToCount(save);
+
+        save = canvas.save();
+        canvas.clipRect(sweepLeft, 0, sweepRight, getHeight());
+        canvas.drawPath(mPathFill, mPaintFill);
+        canvas.drawPath(mPathStroke, mPaintStroke);
+        canvas.restoreToCount(save);
+
+    }
+}

src/com/android/settings/widget/ChartSweepView.java

@@ -0,0 +1,165 @@
+/*
+ * 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.widget;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Paint.Style;
+import android.view.MotionEvent;
+import android.view.View;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * Sweep across a {@link ChartView} at a specific {@link ChartAxis} value, which
+ * a user can drag.
+ */
+public class ChartSweepView extends View {
+
+    private final Paint mPaintSweep;
+    private final Paint mPaintShadow;
+
+    private final ChartAxis mAxis;
+    private long mValue;
+
+    public interface OnSweepListener {
+        public void onSweep(ChartSweepView sweep, boolean sweepDone);
+    }
+
+    private OnSweepListener mListener;
+
+    private boolean mHorizontal;
+    private MotionEvent mTracking;
+
+    public ChartSweepView(Context context, ChartAxis axis, long value, int color) {
+        super(context);
+
+        mAxis = Preconditions.checkNotNull(axis, "missing axis");
+        mValue = value;
+
+        mPaintSweep = new Paint();
+        mPaintSweep.setColor(color);
+        mPaintSweep.setStrokeWidth(3.0f);
+        mPaintSweep.setStyle(Style.FILL_AND_STROKE);
+        mPaintSweep.setAntiAlias(true);
+
+        mPaintShadow = new Paint();
+        mPaintShadow.setColor(Color.BLACK);
+        mPaintShadow.setStrokeWidth(6.0f);
+        mPaintShadow.setStyle(Style.FILL_AND_STROKE);
+        mPaintShadow.setAntiAlias(true);
+
+    }
+
+    public void addOnSweepListener(OnSweepListener listener) {
+        mListener = listener;
+    }
+
+    private void dispatchOnSweep(boolean sweepDone) {
+        if (mListener != null) {
+            mListener.onSweep(this, sweepDone);
+        }
+    }
+
+    public ChartAxis getAxis() {
+        return mAxis;
+    }
+
+    public long getValue() {
+        return mValue;
+    }
+
+    public float getPoint() {
+        return mAxis.convertToPoint(mValue);
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        final View parent = (View) getParent();
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN: {
+                mTracking = event.copy();
+                return true;
+            }
+            case MotionEvent.ACTION_MOVE: {
+                if (mHorizontal) {
+                    setTranslationY(event.getRawY() - mTracking.getRawY());
+                    final float point = (getTop() + getTranslationY() + (getHeight() / 2))
+                            - parent.getPaddingTop();
+                    mValue = mAxis.convertToValue(point);
+                    dispatchOnSweep(false);
+                } else {
+                    setTranslationX(event.getRawX() - mTracking.getRawX());
+                    final float point = (getLeft() + getTranslationX() + (getWidth() / 2))
+                            - parent.getPaddingLeft();
+                    mValue = mAxis.convertToValue(point);
+                    dispatchOnSweep(false);
+                }
+                return true;
+            }
+            case MotionEvent.ACTION_UP: {
+                mTracking = null;
+                setTranslationX(0);
+                setTranslationY(0);
+                requestLayout();
+                dispatchOnSweep(true);
+                return true;
+            }
+            default: {
+                return false;
+            }
+        }
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        // need at least 50px in each direction for grippies
+        // TODO: provide this value through params
+        setMeasuredDimension(50, 50);
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+
+        // draw line across larger dimension
+        final int width = getWidth();
+        final int height = getHeight();
+
+        mHorizontal = width > height;
+
+        if (mHorizontal) {
+            final int centerY = height / 2;
+            final int endX = width - height;
+
+            canvas.drawLine(0, centerY, endX, centerY, mPaintShadow);
+            canvas.drawLine(0, centerY, endX, centerY, mPaintSweep);
+            canvas.drawCircle(endX, centerY, 4.0f, mPaintShadow);
+            canvas.drawCircle(endX, centerY, 4.0f, mPaintSweep);
+        } else {
+            final int centerX = width / 2;
+            final int endY = height - width;
+
+            canvas.drawLine(centerX, 0, centerX, endY, mPaintShadow);
+            canvas.drawLine(centerX, 0, centerX, endY, mPaintSweep);
+            canvas.drawCircle(centerX, endY, 4.0f, mPaintShadow);
+            canvas.drawCircle(centerX, endY, 4.0f, mPaintSweep);
+        }
+    }
+
+}

src/com/android/settings/widget/ChartView.java

@@ -0,0 +1,120 @@
+/*
+ * 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.widget;
+
+import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
+import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.view.Gravity;
+import android.view.View;
+import android.widget.FrameLayout;
+
+/**
+ * Container for two-dimensional chart, drawn with a combination of
+ * {@link ChartGridView}, {@link ChartNetworkSeriesView} and {@link ChartSweepView}
+ * children. The entire chart uses {@link ChartAxis} to map between raw values
+ * and screen coordinates.
+ */
+public class ChartView extends FrameLayout {
+    private static final String TAG = "ChartView";
+
+    // TODO: extend something that supports two-dimensional scrolling
+
+    private final ChartAxis mHoriz;
+    private final ChartAxis mVert;
+
+    private Rect mContent = new Rect();
+
+    public ChartView(Context context, ChartAxis horiz, ChartAxis vert) {
+        super(context);
+
+        mHoriz = checkNotNull(horiz, "missing horiz");
+        mVert = checkNotNull(vert, "missing vert");
+
+        setClipToPadding(false);
+        setClipChildren(false);
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int l, int t, int r, int b) {
+        mContent.set(l + getPaddingLeft(), t + getPaddingTop(), r - getPaddingRight(),
+                b - getPaddingBottom());
+        final int width = mContent.width();
+        final int height = mContent.height();
+
+        // no scrolling yet, so tell dimensions to fill exactly
+        mHoriz.setSize(width);
+        mVert.setSize(height);
+
+        final Rect parentRect = new Rect();
+        final Rect childRect = new Rect();
+
+        for (int i = 0; i < getChildCount(); i++) {
+            final View child = getChildAt(i);
+            final LayoutParams params = (LayoutParams) child.getLayoutParams();
+
+            parentRect.set(mContent);
+
+            if (child instanceof ChartNetworkSeriesView || child instanceof ChartGridView) {
+                // series are always laid out to fill entire graph area
+                // TODO: handle scrolling for series larger than content area
+                Gravity.apply(params.gravity, width, height, parentRect, childRect);
+                child.layout(childRect.left, childRect.top, childRect.right, childRect.bottom);
+
+            } else if (child instanceof ChartSweepView) {
+                // sweep is always placed along specific dimension
+                final ChartSweepView sweep = (ChartSweepView) child;
+                final ChartAxis axis = sweep.getAxis();
+                final float point = sweep.getPoint();
+
+                if (axis == mHoriz) {
+                    parentRect.left = parentRect.right = (int) point + getPaddingLeft();
+                    parentRect.bottom += child.getMeasuredWidth();
+                    Gravity.apply(params.gravity, child.getMeasuredWidth(), parentRect.height(),
+                            parentRect, childRect);
+
+                } else if (axis == mVert) {
+                    parentRect.top = parentRect.bottom = (int) point + getPaddingTop();
+                    parentRect.right += child.getMeasuredHeight();
+                    Gravity.apply(params.gravity, parentRect.width(), child.getMeasuredHeight(),
+                            parentRect, childRect);
+
+                } else {
+                    throw new IllegalStateException("unexpected axis");
+                }
+            }
+
+            child.layout(childRect.left, childRect.top, childRect.right, childRect.bottom);
+        }
+    }
+
+    public static LayoutParams buildChartParams() {
+        final LayoutParams params = new LayoutParams(MATCH_PARENT, MATCH_PARENT);
+        params.gravity = Gravity.LEFT | Gravity.BOTTOM;
+        return params;
+    }
+
+    public static LayoutParams buildSweepParams() {
+        final LayoutParams params = new LayoutParams(WRAP_CONTENT, WRAP_CONTENT);
+        params.gravity = Gravity.CENTER;
+        return params;
+    }
+
+}

src/com/android/settings/widget/InvertedChartAxis.java

@@ -0,0 +1,59 @@
+/*
+ * 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.widget;
+
+/**
+ * Utility to invert another {@link ChartAxis}.
+ */
+public class InvertedChartAxis implements ChartAxis {
+    private final ChartAxis mWrapped;
+    private float mSize;
+
+    public InvertedChartAxis(ChartAxis wrapped) {
+        mWrapped = wrapped;
+    }
+
+    /** {@inheritDoc} */
+    public void setSize(float size) {
+        mSize = size;
+        mWrapped.setSize(size);
+    }
+
+    /** {@inheritDoc} */
+    public float convertToPoint(long value) {
+        return mSize - mWrapped.convertToPoint(value);
+    }
+
+    /** {@inheritDoc} */
+    public long convertToValue(float point) {
+        return mWrapped.convertToValue(mSize - point);
+    }
+
+    /** {@inheritDoc} */
+    public CharSequence getLabel(long value) {
+        return mWrapped.getLabel(value);
+    }
+
+    /** {@inheritDoc} */
+    public float[] getTickPoints() {
+        final float[] points = mWrapped.getTickPoints();
+        for (int i = 0; i < points.length; i++) {
+            points[i] = mSize - points[i];
+        }
+        return points;
+    }
+}