Merge "Tweak battery usage to match red lines." into lmp-preview-dev

res/drawable/data_usage_bar.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2011 The Android Open Source Project
+<!-- Copyright (C) 2014 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.
@@ -16,22 +16,19 @@
 
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:id="@android:id/background">
-        <shape>
+        <nine-patch android:src="@*android:drawable/progress_qntm_alpha"
-            <solid android:color="#ff28262c" />
+            android:tint="@color/quantum_empty_color_light" />
-        </shape>
     </item>
     <item android:id="@android:id/secondaryProgress">
-        <clip>
+        <scale android:scaleWidth="100%">
-            <shape>
+            <nine-patch android:src="@*android:drawable/progress_qntm_alpha"
-                <solid android:color="#c050ade5" />
+                android:tint="?android:attr/colorControlActivated" />
-            </shape>
+        </scale>
-        </clip>
     </item>
     <item android:id="@android:id/progress">
-        <clip>
+        <scale android:scaleWidth="100%">
-            <shape>
+            <nine-patch android:src="@*android:drawable/progress_primary_qntm_alpha"
-                <solid android:color="#c050ade5" />
+                android:tint="?android:attr/colorControlActivated" />
-            </shape>
+        </scale>
-        </clip>
     </item>
 </layer-list>

res/layout/app_percentage_item.xml

@@ -45,16 +45,16 @@
 
     <TextView
         android:id="@android:id/text1"
-        android:layout_marginStart="8dip"
+        android:layout_marginStart="6dip"
         android:layout_marginTop="2dip"
         android:textAppearance="?android:attr/textAppearanceSmall" />
 
     <ProgressBar
         android:id="@android:id/progress"
-        android:layout_height="12dip"
+        android:layout_height="8dip"
         android:layout_columnSpan="2"
         android:layout_gravity="fill_horizontal|top"
-        android:layout_marginTop="4dip"
+        android:layout_marginTop="8dip"
         android:max="100"
         android:progressDrawable="@drawable/data_usage_bar"
         style="?android:attr/progressBarStyleHorizontal" />
@@ -64,7 +64,7 @@
         android:layout_width="0dip"
         android:layout_gravity="fill_horizontal|top"
         android:layout_columnSpan="2"
-        android:layout_marginTop="4dip"
+        android:layout_marginTop="6dip"
         android:visibility="gone"
         android:maxLines="2"
         android:textAppearance="?android:attr/textAppearanceSmall" />

res/layout/battery_history_chart.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2014 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.
+-->
+
+<com.android.settings.fuelgauge.BatteryHistoryChart
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res/com.android.settings"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:gravity="center_vertical"
+    android:id="@+android:id/battery_history_chart"
+    android:paddingEnd="?android:attr/scrollbarSize"
+    android:textAppearance="?android:attr/textAppearanceSmall"
+    android:textColor="#ff000000"
+    app:headerAppearance="?android:attr/textAppearanceMedium"
+    android:shadowRadius="4"
+    android:shadowColor="?android:attr/colorBackground"
+    android:shadowDx="2"
+    android:shadowDy="2"
+    app:barPrimaryColor="?android:attr/colorControlActivated"
+    app:barPredictionColor="@color/quantum_empty_color_light"
+    app:chartMinHeight="@dimen/battery_history_chart_height">
+</com.android.settings.fuelgauge.BatteryHistoryChart>

res/layout/preference_batteryhistory.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2010 The Android Open Source Project
+<!-- Copyright (C) 2014 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.
@@ -14,19 +14,18 @@
      limitations under the License.
 -->
 
-<com.android.settings.fuelgauge.BatteryHistoryChart
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-        xmlns:android="http://schemas.android.com/apk/res/android"
-        xmlns:app="http://schemas.android.com/apk/res/com.android.settings"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:orientation="vertical"
         android:minHeight="@dimen/battery_history_chart_height"
-    android:gravity="center_vertical"
+        android:paddingEnd="?android:attr/scrollbarSize">
-    android:id="@+android:id/battery_history_chart"
+    <include layout="@layout/battery_history_chart" />
-    android:paddingEnd="?android:attr/scrollbarSize"
+    <TextView android:id="@+id/labelsHeader"
-    android:textAppearance="?android:attr/textAppearanceSmall"
+              android:layout_width="match_parent" android:layout_height="48dp"
-    app:headerAppearance="?android:attr/textAppearanceMedium"
+              android:textAppearance="?android:attr/textAppearanceMedium"
-    android:shadowRadius="4"
+              android:textSize="14sp"
-    android:shadowColor="?android:attr/colorBackground"
+              android:textColor="?android:attr/colorControlActivated"
-    android:shadowDx="2"
+              android:gravity="left|center_vertical"
-    android:shadowDy="2">
+              android:text="@string/power_usage_list_summary" />
-</com.android.settings.fuelgauge.BatteryHistoryChart>
+</LinearLayout>

res/values/attrs.xml

@@ -43,6 +43,12 @@
         <attr name="android:shadowRadius" />
         <!-- Text color, typeface, size, and style of header. -->
         <attr name="headerAppearance" format="reference" />
+        <!-- Primary color of chart. -->
+        <attr name="barPrimaryColor" format="color|reference" />
+        <!-- Color of predicted future use part of chart. -->
+        <attr name="barPredictionColor" format="color|reference" />
+        <!-- Minimum height of the chart itself. -->
+        <attr name="chartMinHeight" format="dimension|reference" />
     </declare-styleable>
 
     <declare-styleable name="PercentageBarChart">

res/values/colors.xml

@@ -57,6 +57,10 @@
     <color name="quantum_orange_A200">#ffffab40</color>
     <color name="quantum_orange_A400">#ffff9100</color>
 
+    <color name="quantum_accent_color_light">#FF009688</color>
+    <color name="quantum_accent_color_dark">#FF80CBC4</color>
+    <color name="quantum_empty_color_light">#FFCED7DB</color>
+
     <color name="actionbar_background_color">#ff263238</color>
     <color name="dashboard_background_color">#ffe1e1e0</color>
     <color name="switchbar_background_color">#ff384248</color>

res/values/strings.xml

@@ -3529,8 +3529,18 @@
             <xliff:g id="state">%2$s</xliff:g></string>
     <!-- [CHAR_LIMIT=40] Label for battery level chart when charging with duration -->
     <string name="power_charging_duration"><xliff:g id="level">%1$d</xliff:g>%% -
-            <xliff:g id="state">%2$s</xliff:g>
+            <xliff:g id="time">%2$s</xliff:g> until full</string>
-            (<xliff:g id="time">%3$s</xliff:g> until full)</string>
+    <!-- [CHAR_LIMIT=40] Label for battery level chart when charging with duration -->
+    <string name="power_charging_duration_ac"><xliff:g id="level">%1$d</xliff:g>%% -
+            <xliff:g id="time">%2$s</xliff:g> until full on AC</string>
+    <!-- [CHAR_LIMIT=40] Label for battery level chart when charging with duration -->
+    <string name="power_charging_duration_usb"><xliff:g id="level">%1$d</xliff:g>%% -
+            <xliff:g id="time">%2$s</xliff:g> until full over USB</string>
+    <!-- [CHAR_LIMIT=40] Label for battery level chart when charging with duration -->
+    <string name="power_charging_duration_wireless"><xliff:g id="level">%1$d</xliff:g>%% -
+            <xliff:g id="time">%2$s</xliff:g> until full from wireless</string>
+    <!-- [CHAR_LIMIT=40] Label for list of apps using battery in power use UI -->
+    <string name="power_usage_list_summary">Use since last full charge</string>
     <!-- Battery usage since unplugged -->
     <string name="battery_since_unplugged">Battery use since unplugged</string>
     <!-- Battery usage since user reset the stats -->

res/values/themes.xml

@@ -91,6 +91,8 @@
         <item name="android:colorAccent">@color/quantum_orange_A200</item>
         <!-- Redefine the ActionBar style for contentInsetStart -->
         <item name="android:actionBarStyle">@style/Theme.ActionBar</item>
+        <!-- Redefine control activited color for progress bars and the like -->
+        <item name="android:colorControlActivated">@color/quantum_accent_color_light</item>
     </style>
 
     <style name="Theme.ActionBar" parent="@android:style/Widget.Quantum.Light.ActionBar.Solid">

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

@@ -117,9 +117,6 @@ public class BatteryHistoryChart extends View {
     static final int SERIF = 2;
     static final int MONOSPACE = 3;
 
-    static final int BATTERY_WARN = 29;
-    static final int BATTERY_CRITICAL = 14;
-    
     // First value if for phone off; first value is "scanning"; following values
     // are battery stats signal strength buckets.
     static final int NUM_PHONE_SIGNALS = 7;
@@ -168,6 +165,12 @@ public class BatteryHistoryChart extends View {
     String mCpuRunningLabel;
     String mPhoneSignalLabel;
 
+    int mChartMinHeight;
+    int mHeaderHeight;
+
+    int mBatteryWarnLevel;
+    int mBatteryCriticalLevel;
+
     int mTextAscent;
     int mTextDescent;
     int mHeaderTextAscent;
@@ -353,18 +356,23 @@ public class BatteryHistoryChart extends View {
     public BatteryHistoryChart(Context context, AttributeSet attrs) {
         super(context, attrs);
 
+        mBatteryWarnLevel = mContext.getResources().getInteger(
+                com.android.internal.R.integer.config_lowBatteryWarningLevel);
+        mBatteryCriticalLevel = mContext.getResources().getInteger(
+                com.android.internal.R.integer.config_criticalBatteryWarningLevel);
+
         mThinLineWidth = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                 2, getResources().getDisplayMetrics());
 
-        mBatteryBackgroundPaint.setColor(0xff263238);
+        mBatteryBackgroundPaint.setColor(0xFF009688);
         mBatteryBackgroundPaint.setStyle(Paint.Style.FILL);
-        mBatteryGoodPaint.setARGB(128, 0, 255, 0);
+        mBatteryGoodPaint.setARGB(128, 0, 128, 0);
         mBatteryGoodPaint.setStyle(Paint.Style.STROKE);
-        mBatteryWarnPaint.setARGB(128, 255, 255, 0);
+        mBatteryWarnPaint.setARGB(128, 128, 128, 0);
         mBatteryWarnPaint.setStyle(Paint.Style.STROKE);
-        mBatteryCriticalPaint.setARGB(192, 255, 0, 0);
+        mBatteryCriticalPaint.setARGB(192, 128, 0, 0);
         mBatteryCriticalPaint.setStyle(Paint.Style.STROKE);
-        mTimeRemainPaint.setColor(0xffA5B1B7);
+        mTimeRemainPaint.setColor(0xFFCED7BB);
         mTimeRemainPaint.setStyle(Paint.Style.FILL);
         mChargingPaint.setARGB(255, 0, 128, 0);
         mChargingPaint.setStyle(Paint.Style.STROKE);
@@ -431,6 +439,18 @@ public class BatteryHistoryChart extends View {
                     mainTextAttrs.styleIndex = a.getInt(attr, mainTextAttrs.styleIndex);
                     headTextAttrs.styleIndex = a.getInt(attr, headTextAttrs.styleIndex);
                     break;
+
+                case R.styleable.BatteryHistoryChart_barPrimaryColor:
+                    mBatteryBackgroundPaint.setColor(a.getInt(attr, 0));
+                    break;
+
+                case R.styleable.BatteryHistoryChart_barPredictionColor:
+                    mTimeRemainPaint.setColor(a.getInt(attr, 0));
+                    break;
+
+                case R.styleable.BatteryHistoryChart_chartMinHeight:
+                    mChartMinHeight = a.getDimensionPixelSize(attr, 0);
+                    break;
             }
         }
         
@@ -502,8 +522,19 @@ public class BatteryHistoryChart extends View {
                 remainingTimeUs = chargeTime;
                 String timeString = Formatter.formatShortElapsedTime(getContext(),
                         chargeTime / 1000);
+                int plugType = mBatteryBroadcast.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0);
+                int resId;
+                if (plugType == BatteryManager.BATTERY_PLUGGED_AC) {
+                    resId = R.string.power_charging_duration_ac;
+                } else if (plugType == BatteryManager.BATTERY_PLUGGED_USB) {
+                    resId = R.string.power_charging_duration_usb;
+                } else if (plugType == BatteryManager.BATTERY_PLUGGED_WIRELESS) {
+                    resId = R.string.power_charging_duration_wireless;
+                } else {
+                    resId = R.string.power_charging_duration;
+                }
                 mChargeLabelString = getContext().getResources().getString(
-                        R.string.power_charging_duration, batteryLevel, statusLabel, timeString);
+                        resId, batteryLevel, timeString);
             } else {
                 mChargeLabelString = getContext().getResources().getString(
                         R.string.power_charging, batteryLevel, statusLabel);
@@ -562,19 +593,12 @@ public class BatteryHistoryChart extends View {
             mHavePhoneSignal = true;
         }
         if (mHistEnd <= mHistStart) mHistEnd = mHistStart+1;
-
-        //String durationString = Utils.formatElapsedTime(getContext(), mStatsPeriod / 1000, true);
-        //mDurationString = getContext().getString(R.string.battery_stats_on_battery,
-        //        durationString);
-        mDurationString = Utils.formatElapsedTime(getContext(), mHistEnd - mHistStart, true);
     }
 
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
         mMaxPercentLabelStringWidth = (int)mTextPaint.measureText(mMaxPercentLabelString);
         mMinPercentLabelStringWidth = (int)mTextPaint.measureText(mMinPercentLabelString);
-        mDurationStringWidth = (int)mTextPaint.measureText(mDurationString);
         mDrainStringWidth = (int)mHeaderTextPaint.measureText(mDrainString);
         mChargeLabelStringWidth = (int)mHeaderTextPaint.measureText(mChargeLabelString);
         mChargeDurationStringWidth = (int)mHeaderTextPaint.measureText(mChargeDurationString);
@@ -582,6 +606,10 @@ public class BatteryHistoryChart extends View {
         mTextDescent = (int)mTextPaint.descent();
         mHeaderTextAscent = (int)mHeaderTextPaint.ascent();
         mHeaderTextDescent = (int)mHeaderTextPaint.descent();
+        int headerTextHeight = mHeaderTextDescent - mHeaderTextAscent;
+        mHeaderHeight = headerTextHeight*2 - mTextAscent;
+        setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec),
+                getDefaultSize(mChartMinHeight+mHeaderHeight, heightMeasureSpec));
     }
 
     void finishPaths(int w, int h, int levelh, int startX, int y, Path curLevelPath,
@@ -669,8 +697,7 @@ public class BatteryHistoryChart extends View {
         mLastHeight = h;
 
         int textHeight = mTextDescent - mTextAscent;
-        int headerTextHeight = mHeaderTextDescent - mHeaderTextAscent;
+        if (h > ((textHeight*10)+mChartMinHeight)) {
-        if (h > (textHeight*12)) {
             mLargeMode = true;
             if (h > (textHeight*15)) {
                 // Plenty of room for the chart.
@@ -693,7 +720,7 @@ public class BatteryHistoryChart extends View {
         }
         if (mLineWidth <= 0) mLineWidth = 1;
 
-        mLevelTop = headerTextHeight*2 - mTextAscent;
+        mLevelTop = mHeaderHeight;
         mLevelLeft = mMaxPercentLabelStringWidth + mThinLineWidth*3;
         mLevelRight = w;
         int levelWidth = mLevelRight-mLevelLeft;
@@ -798,17 +825,19 @@ public class BatteryHistoryChart extends View {
                             // Don't plot changes within a pixel.
                             Path path;
                             byte value = rec.batteryLevel;
-                            if (value <= BATTERY_CRITICAL) path = mBatCriticalPath;
+                            if (value <= mBatteryCriticalLevel) path = mBatCriticalPath;
-                            else if (value <= BATTERY_WARN) path = mBatWarnPath;
+                            else if (value <= mBatteryWarnLevel) path = mBatWarnPath;
-                            else path = mBatGoodPath;
+                            else path = null; //mBatGoodPath;
 
                             if (path != lastLinePath) {
                                 if (lastLinePath != null) {
                                     lastLinePath.lineTo(x, y);
                                 }
+                                if (path != null) {
                                     path.moveTo(x, y);
+                                }
                                 lastLinePath = path;
-                            } else {
+                            } else if (path != null) {
                                 path.lineTo(x, y);
                             }
 
@@ -937,6 +966,7 @@ public class BatteryHistoryChart extends View {
             mTimeRemainPath.close();
         }
 
+        if (mStartWallTime > 0) {
             // Create the time labels at the bottom.
             boolean is24hr = is24Hour();
             Calendar calStart = Calendar.getInstance();
@@ -988,6 +1018,18 @@ public class BatteryHistoryChart extends View {
             }
         }
 
+        if (mTimeLabels.size() < 2) {
+            // If there are fewer than 2 time labels, then they are useless.  Just
+            // show an axis label giving the entire duration.
+            mDurationString = Formatter.formatShortElapsedTime(getContext(),
+                    mEndWallTime - mStartWallTime);
+            mDurationStringWidth = (int)mTextPaint.measureText(mDurationString);
+        } else {
+            mDurationString = null;
+            mDurationStringWidth = 0;
+        }
+    }
+
     void addTimeLabel(Calendar cal, int levelLeft, int levelRight, boolean is24hr) {
         final long walltimeStart = mStartWallTime;
         final long walltimeChange = mEndWallTime-walltimeStart;
@@ -1031,9 +1073,7 @@ public class BatteryHistoryChart extends View {
             if (DEBUG) Log.d(TAG, "Drawing time remain path.");
             canvas.drawPath(mTimeRemainPath, mTimeRemainPaint);
         }
-        int durationHalfWidth = mDurationStringWidth / 2;
+        if (mTimeLabels.size() > 1) {
-        if (layoutRtl) durationHalfWidth = -durationHalfWidth;
-        if (mTimeLabels.size() > 0) {
             int y = mLevelBottom - mTextAscent + (mThinLineWidth*4);
             int ytick = mLevelBottom+mThinLineWidth+(mThinLineWidth/2);
             mTextPaint.setTextAlign(Paint.Align.LEFT);
@@ -1072,31 +1112,24 @@ public class BatteryHistoryChart extends View {
                     canvas.drawLine(label.x, ytick, label.x, ytick+mThinLineWidth, mTextPaint);
                 }
             }
-        }
+        } else if (mDurationString != null) {
-
+            int y = mLevelBottom - mTextAscent + (mThinLineWidth*4);
-        if (false) {
+            mTextPaint.setTextAlign(Paint.Align.LEFT);
-            // Old code for printing label.
+            canvas.drawText(mDurationString,
-            mTextPaint.setTextAlign(textAlignLeft);
+                    mLevelLeft + (mLevelRight-mLevelLeft)/2 - mDurationStringWidth/2,
-            if (mLargeMode) {
+                    y, mTextPaint);
-                canvas.drawText(mDurationString, (width / 2) - durationHalfWidth,
-                        mLevelBottom - mTextAscent + mThinLineWidth, mTextPaint);
-            } else {
-                canvas.drawText(mDurationString, (width / 2) - durationHalfWidth,
-                        mLevelTop + ((height-mLevelTop) / 2) - ((mTextDescent - mTextAscent) / 2)
-                                - mTextAscent, mTextPaint);
-            }
         }
 
         int headerTop = -mHeaderTextAscent + (mHeaderTextDescent-mHeaderTextAscent)/3;
         mHeaderTextPaint.setTextAlign(textAlignLeft);
         if (DEBUG) Log.d(TAG, "Drawing charge label string: " + mChargeLabelString);
         canvas.drawText(mChargeLabelString, textStartX, headerTop, mHeaderTextPaint);
-        durationHalfWidth = mChargeDurationStringWidth / 2;
+        int stringHalfWidth = mChargeDurationStringWidth / 2;
-        if (layoutRtl) durationHalfWidth = -durationHalfWidth;
+        if (layoutRtl) stringHalfWidth = -stringHalfWidth;
         int headerCenter = ((width-mChargeDurationStringWidth-mDrainStringWidth)/2)
                 + (layoutRtl ? mDrainStringWidth : mChargeLabelStringWidth);
         if (DEBUG) Log.d(TAG, "Drawing charge duration string: " + mChargeDurationString);
-        canvas.drawText(mChargeDurationString, headerCenter - durationHalfWidth, headerTop,
+        canvas.drawText(mChargeDurationString, headerCenter - stringHalfWidth, headerTop,
                 mHeaderTextPaint);
         mHeaderTextPaint.setTextAlign(textAlignRight);
         if (DEBUG) Log.d(TAG, "Drawing drain string: " + mDrainString);
@@ -1181,7 +1214,7 @@ public class BatteryHistoryChart extends View {
         canvas.drawText(mMinPercentLabelString,
                 mMaxPercentLabelStringWidth-mMinPercentLabelStringWidth,
                 mLevelBottom - mThinLineWidth, mTextPaint);
-        canvas.drawLine(0, mLevelBottom+mThinLineWidth, width,
+        canvas.drawLine(mLevelLeft/2, mLevelBottom+mThinLineWidth, width,
                 mLevelBottom+mThinLineWidth, mTextPaint);
 
         if (mDateLabels.size() > 0) {

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

@@ -48,7 +48,7 @@ public class BatteryHistoryDetail extends Fragment {
     
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
-        View view = inflater.inflate(R.layout.preference_batteryhistory, null);
+        View view = inflater.inflate(R.layout.battery_history_chart, null);
         BatteryHistoryChart chart = (BatteryHistoryChart)view.findViewById(
                 R.id.battery_history_chart);
         chart.setStats(mStats, mBatteryBroadcast);

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

@@ -37,6 +37,9 @@ public class BatteryHistoryPreference extends Preference {
     final private BatteryStats mStats;
     final private Intent mBatteryBroadcast;
 
+    private boolean mHideLabels;
+    private View mLabelHeader;
+
     public BatteryHistoryPreference(Context context, BatteryStats stats, Intent batteryBroadcast) {
         super(context);
         setLayoutResource(R.layout.preference_batteryhistory);
@@ -48,6 +51,15 @@ public class BatteryHistoryPreference extends Preference {
         return mStats;
     }
 
+    public void setHideLabels(boolean hide) {
+        if (mHideLabels != hide) {
+            mHideLabels = hide;
+            if (mLabelHeader != null) {
+                mLabelHeader.setVisibility(hide ? View.GONE : View.VISIBLE);
+            }
+        }
+    }
+
     @Override
     protected void onBindView(View view) {
         super.onBindView(view);
@@ -55,5 +67,7 @@ public class BatteryHistoryPreference extends Preference {
         BatteryHistoryChart chart = (BatteryHistoryChart)view.findViewById(
                 R.id.battery_history_chart);
         chart.setStats(mStats, mBatteryBroadcast);
+        mLabelHeader = view.findViewById(R.id.labelsHeader);
+        mLabelHeader.setVisibility(mHideLabels ? View.GONE : View.VISIBLE);
     }
 }

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

@@ -64,6 +64,7 @@ public class PowerUsageSummary extends PreferenceFragment {
 
     private UserManager mUm;
 
+    private BatteryHistoryPreference mHistPref;
     private PreferenceGroup mAppListGroup;
     private String mBatteryLevel;
     private String mBatteryStatus;
@@ -210,6 +211,7 @@ public class PowerUsageSummary extends PreferenceFragment {
     private void addNotAvailableMessage() {
         Preference notAvailable = new Preference(getActivity());
         notAvailable.setTitle(R.string.power_usage_not_available);
+        mHistPref.setHideLabels(true);
         mAppListGroup.addPreference(notAvailable);
     }
 
@@ -233,16 +235,17 @@ public class PowerUsageSummary extends PreferenceFragment {
 
         mStatsHelper.refreshStats(BatteryStats.STATS_SINCE_CHARGED, UserHandle.myUserId());
 
-        BatteryHistoryPreference hist = new BatteryHistoryPreference(
+        mHistPref = new BatteryHistoryPreference(
                 getActivity(), mStatsHelper.getStats(), mStatsHelper.getBatteryBroadcast());
-        hist.setOrder(-1);
+        mHistPref.setOrder(-1);
-        mAppListGroup.addPreference(hist);
+        mAppListGroup.addPreference(mHistPref);
 
         if (mStatsHelper.getPowerProfile().getAveragePower(
                 PowerProfile.POWER_SCREEN_FULL) < 10) {
             addNotAvailableMessage();
             return;
         }
+        boolean addedSome = false;
         final int dischargeAmount = mStatsHelper.getStats().getDischargeAmount(mStatsType);
         List<BatterySipper> usageList = mStatsHelper.getUsageList();
         for (int i=0; i<usageList.size(); i++) {
@@ -263,9 +266,13 @@ public class PowerUsageSummary extends PreferenceFragment {
             if (sipper.uidObj != null) {
                 pref.setKey(Integer.toString(sipper.uidObj.getUid()));
             }
+            addedSome = true;
             mAppListGroup.addPreference(pref);
             if (mAppListGroup.getPreferenceCount() > (MAX_ITEMS_TO_LIST+1)) break;
         }
+        if (!addedSome) {
+            addNotAvailableMessage();
+        }
 
         BatteryEntry.startRequestQueue();
     }