Merge "Move UsageGraph from SettingsLib to Settings."

res/layout/battery_history_detail.xml

@@ -49,7 +49,7 @@
                 android:textAppearance="?android:attr/textAppearanceMedium"
                 android:textColor="?android:attr/textColorSecondary"/>
 
-            <com.android.settingslib.graph.UsageView
+            <com.android.settings.graph.UsageView
                 android:id="@+id/battery_usage"
                 android:layout_width="match_parent"
                 android:layout_height="141dp"

res/layout/battery_usage_graph.xml

@@ -32,7 +32,7 @@
         android:textSize="36sp"
         android:textColor="?android:attr/colorAccent" />
 
-    <com.android.settingslib.graph.UsageView
+    <com.android.settings.graph.UsageView
         android:id="@+id/battery_usage"
         android:layout_width="match_parent"
         android:layout_height="141dp"

res/layout/data_usage_graph.xml

@@ -22,7 +22,7 @@
     android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
     android:orientation="vertical">
 
-    <com.android.settingslib.graph.UsageView
+    <com.android.settings.graph.UsageView
         android:id="@+id/data_usage"
         android:layout_width="match_parent"
         android:layout_height="@dimen/data_usage_chart_height"

res/layout/usage_bottom_label.xml

@@ -0,0 +1,20 @@
+<!--
+    Copyright (C) 2016 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.
+-->
+<TextView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:textAppearance="?android:attr/textAppearanceSmall" />

res/layout/usage_side_label.xml

@@ -0,0 +1,20 @@
+<!--
+    Copyright (C) 2016 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.
+-->
+<TextView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:textAppearance="?android:attr/textAppearanceSmall" />

res/layout/usage_view.xml

@@ -0,0 +1,99 @@
+<!--
+    Copyright (C) 2016 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.
+-->
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical">
+
+    <LinearLayout
+        android:id="@+id/graph_label_group"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1"
+        android:orientation="horizontal"
+        android:clipChildren="false"
+        android:clipToPadding="false">
+
+        <LinearLayout
+            android:id="@+id/label_group"
+            android:layout_width="@dimen/usage_graph_labels_width"
+            android:layout_height="match_parent"
+            android:orientation="vertical">
+
+            <include android:id="@+id/label_top"
+                layout="@layout/usage_side_label" />
+
+            <Space
+                android:id="@+id/space1"
+                android:layout_width="wrap_content"
+                android:layout_height="0dp"
+                android:layout_weight="1" />
+
+            <include android:id="@+id/label_middle"
+                layout="@layout/usage_side_label" />
+
+            <Space
+                android:id="@+id/space2"
+                android:layout_width="wrap_content"
+                android:layout_height="0dp"
+                android:layout_weight="1" />
+
+            <include android:id="@+id/label_bottom"
+                layout="@layout/usage_side_label" />
+
+        </LinearLayout>
+
+        <com.android.settings.graph.UsageGraph
+            android:id="@+id/usage_graph"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:layout_weight="1"
+            android:layout_marginTop="@dimen/usage_graph_margin_top_bottom"
+            android:layout_marginBottom="@dimen/usage_graph_margin_top_bottom" />
+
+    </LinearLayout>
+
+    <LinearLayout
+        android:id="@+id/bottom_label_group"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
+        <Space
+            android:id="@+id/bottom_label_space"
+            android:layout_width="@dimen/usage_graph_labels_width"
+            android:layout_height="wrap_content"/>
+        <com.android.settings.graph.BottomLabelLayout
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:orientation="horizontal"
+            android:layoutDirection="ltr">
+            <include android:id="@+id/label_start"
+                     layout="@layout/usage_side_label" />
+
+            <Space
+                android:id="@+id/spacer"
+                android:layout_width="40dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1" />
+
+            <include android:id="@+id/label_end"
+                     layout="@layout/usage_side_label" />
+        </com.android.settings.graph.BottomLabelLayout>
+    </LinearLayout>
+
+</LinearLayout>

res/values/attrs.xml

@@ -162,4 +162,13 @@
         <attr name="android:tint" format="color|reference" />
     </declare-styleable>
 
+    <!-- For UsageView -->
+    <declare-styleable name="UsageView">
+        <attr name="android:colorAccent" />
+        <attr name="sideLabels" format="reference" />
+        <attr name="bottomLabels" format="reference" />
+        <attr name="textColor" format="color" />
+        <attr name="android:gravity" />
+    </declare-styleable>
+
 </resources>

src/com/android/settings/datausage/ChartDataUsagePreference.java

@@ -15,7 +15,6 @@
 package com.android.settings.datausage;
 
 import android.content.Context;
-import android.content.res.TypedArray;
 import android.net.NetworkPolicy;
 import android.net.NetworkStatsHistory;
 import android.net.TrafficStats;
@@ -29,7 +28,7 @@ import android.util.AttributeSet;
 import android.util.SparseIntArray;
 import com.android.settings.R;
 import com.android.settings.Utils;
-import com.android.settingslib.graph.UsageView;
+import com.android.settings.graph.UsageView;
 
 public class ChartDataUsagePreference extends Preference {
 

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

@@ -30,7 +30,7 @@ import com.android.internal.os.BatteryStatsHelper;
 import com.android.settings.R;
 import com.android.settings.SettingsPreferenceFragment;
 import com.android.settings.fuelgauge.BatteryActiveView.BatteryActiveProvider;
-import com.android.settingslib.graph.UsageView;
+import com.android.settings.graph.UsageView;
 
 public class BatteryHistoryDetail extends SettingsPreferenceFragment {
     public static final String EXTRA_STATS = "stats";

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

@@ -24,7 +24,7 @@ import android.util.AttributeSet;
 import android.widget.TextView;
 import com.android.internal.os.BatteryStatsHelper;
 import com.android.settings.R;
-import com.android.settingslib.graph.UsageView;
+import com.android.settings.graph.UsageView;
 
 /**
  * Custom preference for displaying power consumption as a bar and an icon on the left for the

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

@@ -34,7 +34,7 @@ import com.android.internal.os.BatteryStatsHelper;
 import com.android.settings.overlay.FeatureFactory;
 import com.android.settingslib.R;
 import com.android.settings.Utils;
-import com.android.settingslib.graph.UsageView;
+import com.android.settings.graph.UsageView;
 
 public class BatteryInfo {
 

src/com/android/settings/graph/BottomLabelLayout.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2017 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.graph;
+
+import android.annotation.Nullable;
+import android.content.Context;
+import android.support.annotation.VisibleForTesting;
+import android.util.AttributeSet;
+import android.view.Gravity;
+import android.view.View;
+import android.widget.LinearLayout;
+
+import com.android.settingslib.R;
+
+/**
+ * An extension of LinearLayout that automatically switches to vertical
+ * orientation when it can't fit its child views horizontally.
+ *
+ * Main logic in this class comes from {@link android.support.v7.widget.ButtonBarLayout}.
+ * Compared with {@link android.support.v7.widget.ButtonBarLayout}, this layout won't reverse
+ * children's order and won't update the minimum height
+ */
+public class BottomLabelLayout extends LinearLayout {
+    private static final String TAG = "BottomLabelLayout";
+
+    public BottomLabelLayout(Context context,
+            @Nullable AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
+        final boolean isStacked = isStacked();
+        boolean needsRemeasure = false;
+
+        // If we're not stacked, make sure the measure spec is AT_MOST rather
+        // than EXACTLY. This ensures that we'll still get TOO_SMALL so that we
+        // know to stack the buttons.
+        final int initialWidthMeasureSpec;
+        if (!isStacked && MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY) {
+            initialWidthMeasureSpec = MeasureSpec.makeMeasureSpec(widthSize, MeasureSpec.AT_MOST);
+
+            // We'll need to remeasure again to fill excess space.
+            needsRemeasure = true;
+        } else {
+            initialWidthMeasureSpec = widthMeasureSpec;
+        }
+
+        super.onMeasure(initialWidthMeasureSpec, heightMeasureSpec);
+        if (!isStacked) {
+            final int measuredWidth = getMeasuredWidthAndState();
+            final int measuredWidthState = measuredWidth & View.MEASURED_STATE_MASK;
+
+            if (measuredWidthState == View.MEASURED_STATE_TOO_SMALL) {
+                setStacked(true);
+                // Measure again in the new orientation.
+                needsRemeasure = true;
+            }
+        }
+
+        if (needsRemeasure) {
+            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        }
+
+    }
+
+    @VisibleForTesting
+    void setStacked(boolean stacked) {
+        setOrientation(stacked ? LinearLayout.VERTICAL : LinearLayout.HORIZONTAL);
+        setGravity(stacked ? Gravity.START : Gravity.BOTTOM);
+
+        final View spacer = findViewById(R.id.spacer);
+        if (spacer != null) {
+            spacer.setVisibility(stacked ? View.GONE : View.VISIBLE);
+        }
+    }
+
+    private boolean isStacked() {
+        return getOrientation() == LinearLayout.VERTICAL;
+    }
+}

src/com/android/settings/graph/UsageGraph.java

@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2016 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.graph;
+
+import android.annotation.Nullable;
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Canvas;
+import android.graphics.CornerPathEffect;
+import android.graphics.DashPathEffect;
+import android.graphics.LinearGradient;
+import android.graphics.Paint;
+import android.graphics.Paint.Cap;
+import android.graphics.Paint.Join;
+import android.graphics.Paint.Style;
+import android.graphics.Path;
+import android.graphics.Shader.TileMode;
+import android.graphics.drawable.Drawable;
+import android.util.AttributeSet;
+import android.util.SparseIntArray;
+import android.util.TypedValue;
+import android.view.View;
+import com.android.settingslib.R;
+
+public class UsageGraph extends View {
+
+    private static final int PATH_DELIM = -1;
+
+    private final Paint mLinePaint;
+    private final Paint mFillPaint;
+    private final Paint mDottedPaint;
+
+    private final Drawable mDivider;
+    private final Drawable mTintedDivider;
+    private final int mDividerSize;
+
+    private final Path mPath = new Path();
+
+    // Paths in coordinates they are passed in.
+    private final SparseIntArray mPaths = new SparseIntArray();
+    // Paths in local coordinates for drawing.
+    private final SparseIntArray mLocalPaths = new SparseIntArray();
+    private final int mCornerRadius;
+
+    private int mAccentColor;
+    private boolean mShowProjection;
+    private boolean mProjectUp;
+
+    private float mMaxX = 100;
+    private float mMaxY = 100;
+
+    private float mMiddleDividerLoc = .5f;
+    private int mMiddleDividerTint = -1;
+    private int mTopDividerTint = -1;
+
+    public UsageGraph(Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+        final Resources resources = context.getResources();
+
+        mLinePaint = new Paint();
+        mLinePaint.setStyle(Style.STROKE);
+        mLinePaint.setStrokeCap(Cap.ROUND);
+        mLinePaint.setStrokeJoin(Join.ROUND);
+        mLinePaint.setAntiAlias(true);
+        mCornerRadius = resources.getDimensionPixelSize(R.dimen.usage_graph_line_corner_radius);
+        mLinePaint.setPathEffect(new CornerPathEffect(mCornerRadius));
+        mLinePaint.setStrokeWidth(resources.getDimensionPixelSize(R.dimen.usage_graph_line_width));
+
+        mFillPaint = new Paint(mLinePaint);
+        mFillPaint.setStyle(Style.FILL);
+
+        mDottedPaint = new Paint(mLinePaint);
+        mDottedPaint.setStyle(Style.STROKE);
+        float dots = resources.getDimensionPixelSize(R.dimen.usage_graph_dot_size);
+        float interval = resources.getDimensionPixelSize(R.dimen.usage_graph_dot_interval);
+        mDottedPaint.setStrokeWidth(dots * 3);
+        mDottedPaint.setPathEffect(new DashPathEffect(new float[] {dots, interval}, 0));
+        mDottedPaint.setColor(context.getColor(R.color.usage_graph_dots));
+
+        TypedValue v = new TypedValue();
+        context.getTheme().resolveAttribute(com.android.internal.R.attr.listDivider, v, true);
+        mDivider = context.getDrawable(v.resourceId);
+        mTintedDivider = context.getDrawable(v.resourceId);
+        mDividerSize = resources.getDimensionPixelSize(R.dimen.usage_graph_divider_size);
+    }
+
+    void clearPaths() {
+        mPaths.clear();
+    }
+
+    void setMax(int maxX, int maxY) {
+        mMaxX = maxX;
+        mMaxY = maxY;
+    }
+
+    void setDividerLoc(int height) {
+        mMiddleDividerLoc = 1 - height / mMaxY;
+    }
+
+    void setDividerColors(int middleColor, int topColor) {
+        mMiddleDividerTint = middleColor;
+        mTopDividerTint = topColor;
+    }
+
+    public void addPath(SparseIntArray points) {
+        for (int i = 0; i < points.size(); i++) {
+            mPaths.put(points.keyAt(i), points.valueAt(i));
+        }
+        mPaths.put(points.keyAt(points.size() - 1) + 1, PATH_DELIM);
+        calculateLocalPaths();
+        postInvalidate();
+    }
+
+    void setAccentColor(int color) {
+        mAccentColor = color;
+        mLinePaint.setColor(mAccentColor);
+        updateGradient();
+        postInvalidate();
+    }
+
+    void setShowProjection(boolean showProjection, boolean projectUp) {
+        mShowProjection = showProjection;
+        mProjectUp = projectUp;
+        postInvalidate();
+    }
+
+    @Override
+    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+        super.onSizeChanged(w, h, oldw, oldh);
+        updateGradient();
+        calculateLocalPaths();
+    }
+
+    private void calculateLocalPaths() {
+        if (getWidth() == 0) return;
+        mLocalPaths.clear();
+        int pendingXLoc = 0;
+        int pendingYLoc = PATH_DELIM;
+        for (int i = 0; i < mPaths.size(); i++) {
+            int x = mPaths.keyAt(i);
+            int y = mPaths.valueAt(i);
+            if (y == PATH_DELIM) {
+                if (i == mPaths.size() - 1 && pendingYLoc != PATH_DELIM) {
+                    // Connect to the end of the graph.
+                    mLocalPaths.put(pendingXLoc, pendingYLoc);
+                }
+                // Clear out any pending points.
+                pendingYLoc = PATH_DELIM;
+                mLocalPaths.put(pendingXLoc + 1, PATH_DELIM);
+            } else {
+                final int lx = getX(x);
+                final int ly = getY(y);
+                pendingXLoc = lx;
+                if (mLocalPaths.size() > 0) {
+                    int lastX = mLocalPaths.keyAt(mLocalPaths.size() - 1);
+                    int lastY = mLocalPaths.valueAt(mLocalPaths.size() - 1);
+                    if (lastY != PATH_DELIM && !hasDiff(lastX, lx) && !hasDiff(lastY, ly)) {
+                        pendingYLoc = ly;
+                        continue;
+                    }
+                }
+                mLocalPaths.put(lx, ly);
+            }
+        }
+    }
+
+    private boolean hasDiff(int x1, int x2) {
+        return Math.abs(x2 - x1) >= mCornerRadius;
+    }
+
+    private int getX(float x) {
+        return (int) (x / mMaxX * getWidth());
+    }
+
+    private int getY(float y) {
+        return (int) (getHeight() * (1 - (y / mMaxY)));
+    }
+
+    private void updateGradient() {
+        mFillPaint.setShader(new LinearGradient(0, 0, 0, getHeight(),
+                getColor(mAccentColor, .2f), 0, TileMode.CLAMP));
+    }
+
+    private int getColor(int color, float alphaScale) {
+        return (color & (((int) (0xff * alphaScale) << 24) | 0xffffff));
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        // Draw lines across the top, middle, and bottom.
+        if (mMiddleDividerLoc != 0) {
+            drawDivider(0, canvas, mTopDividerTint);
+        }
+        drawDivider((int) ((canvas.getHeight() - mDividerSize) * mMiddleDividerLoc), canvas,
+                mMiddleDividerTint);
+        drawDivider(canvas.getHeight() - mDividerSize, canvas, -1);
+
+        if (mLocalPaths.size() == 0) {
+            return;
+        }
+        if (mShowProjection) {
+            drawProjection(canvas);
+        }
+        drawFilledPath(canvas);
+        drawLinePath(canvas);
+    }
+
+    private void drawProjection(Canvas canvas) {
+        mPath.reset();
+        int x = mLocalPaths.keyAt(mLocalPaths.size() - 2);
+        int y = mLocalPaths.valueAt(mLocalPaths.size() - 2);
+        mPath.moveTo(x, y);
+        mPath.lineTo(canvas.getWidth(), mProjectUp ? 0 : canvas.getHeight());
+        canvas.drawPath(mPath, mDottedPaint);
+    }
+
+    private void drawLinePath(Canvas canvas) {
+        mPath.reset();
+        mPath.moveTo(mLocalPaths.keyAt(0), mLocalPaths.valueAt(0));
+        for (int i = 1; i < mLocalPaths.size(); i++) {
+            int x = mLocalPaths.keyAt(i);
+            int y = mLocalPaths.valueAt(i);
+            if (y == PATH_DELIM) {
+                if (++i < mLocalPaths.size()) {
+                    mPath.moveTo(mLocalPaths.keyAt(i), mLocalPaths.valueAt(i));
+                }
+            } else {
+                mPath.lineTo(x, y);
+            }
+        }
+        canvas.drawPath(mPath, mLinePaint);
+    }
+
+    private void drawFilledPath(Canvas canvas) {
+        mPath.reset();
+        float lastStartX = mLocalPaths.keyAt(0);
+        mPath.moveTo(mLocalPaths.keyAt(0), mLocalPaths.valueAt(0));
+        for (int i = 1; i < mLocalPaths.size(); i++) {
+            int x = mLocalPaths.keyAt(i);
+            int y = mLocalPaths.valueAt(i);
+            if (y == PATH_DELIM) {
+                mPath.lineTo(mLocalPaths.keyAt(i - 1), getHeight());
+                mPath.lineTo(lastStartX, getHeight());
+                mPath.close();
+                if (++i < mLocalPaths.size()) {
+                    lastStartX = mLocalPaths.keyAt(i);
+                    mPath.moveTo(mLocalPaths.keyAt(i), mLocalPaths.valueAt(i));
+                }
+            } else {
+                mPath.lineTo(x, y);
+            }
+        }
+        canvas.drawPath(mPath, mFillPaint);
+    }
+
+    private void drawDivider(int y, Canvas canvas, int tintColor) {
+        Drawable d = mDivider;
+        if (tintColor != -1) {
+            mTintedDivider.setTint(tintColor);
+            d = mTintedDivider;
+        }
+        d.setBounds(0, y, canvas.getWidth(), y + mDividerSize);
+        d.draw(canvas);
+    }
+}

src/com/android/settings/graph/UsageView.java

@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2016 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.graph;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.util.AttributeSet;
+import android.util.SparseIntArray;
+import android.view.Gravity;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.FrameLayout;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+import com.android.settingslib.R;
+
+public class UsageView extends FrameLayout {
+
+    private final UsageGraph mUsageGraph;
+    private final TextView[] mLabels;
+    private final TextView[] mBottomLabels;
+
+    public UsageView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        LayoutInflater.from(context).inflate(R.layout.usage_view, this);
+        mUsageGraph = findViewById(R.id.usage_graph);
+        mLabels = new TextView[] {
+                findViewById(R.id.label_bottom),
+                findViewById(R.id.label_middle),
+                findViewById(R.id.label_top),
+        };
+        mBottomLabels = new TextView[] {
+                findViewById(R.id.label_start),
+                findViewById(R.id.label_end),
+        };
+        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.UsageView, 0, 0);
+        if (a.hasValue(R.styleable.UsageView_sideLabels)) {
+            setSideLabels(a.getTextArray(R.styleable.UsageView_sideLabels));
+        }
+        if (a.hasValue(R.styleable.UsageView_bottomLabels)) {
+            setBottomLabels(a.getTextArray(R.styleable.UsageView_bottomLabels));
+        }
+        if (a.hasValue(R.styleable.UsageView_textColor)) {
+            int color = a.getColor(R.styleable.UsageView_textColor, 0);
+            for (TextView v : mLabels) {
+                v.setTextColor(color);
+            }
+            for (TextView v : mBottomLabels) {
+                v.setTextColor(color);
+            }
+        }
+        if (a.hasValue(R.styleable.UsageView_android_gravity)) {
+            int gravity = a.getInt(R.styleable.UsageView_android_gravity, 0);
+            if (gravity == Gravity.END) {
+                LinearLayout layout = findViewById(R.id.graph_label_group);
+                LinearLayout labels = findViewById(R.id.label_group);
+                // Swap the children order.
+                layout.removeView(labels);
+                layout.addView(labels);
+                // Set gravity.
+                labels.setGravity(Gravity.END);
+                // Swap the bottom space order.
+                LinearLayout bottomLabels = findViewById(R.id.bottom_label_group);
+                View bottomSpace = bottomLabels.findViewById(R.id.bottom_label_space);
+                bottomLabels.removeView(bottomSpace);
+                bottomLabels.addView(bottomSpace);
+            } else if (gravity != Gravity.START) {
+                throw new IllegalArgumentException("Unsupported gravity " + gravity);
+            }
+        }
+        mUsageGraph.setAccentColor(a.getColor(R.styleable.UsageView_android_colorAccent, 0));
+    }
+
+    public void clearPaths() {
+        mUsageGraph.clearPaths();
+    }
+
+    public void addPath(SparseIntArray points) {
+        mUsageGraph.addPath(points);
+    }
+
+    public void configureGraph(int maxX, int maxY, boolean showProjection, boolean projectUp) {
+        mUsageGraph.setMax(maxX, maxY);
+        mUsageGraph.setShowProjection(showProjection, projectUp);
+    }
+
+    public void setAccentColor(int color) {
+        mUsageGraph.setAccentColor(color);
+    }
+
+    public void setDividerLoc(int dividerLoc) {
+        mUsageGraph.setDividerLoc(dividerLoc);
+    }
+
+    public void setDividerColors(int middleColor, int topColor) {
+        mUsageGraph.setDividerColors(middleColor, topColor);
+    }
+
+    public void setSideLabelWeights(float before, float after) {
+        setWeight(R.id.space1, before);
+        setWeight(R.id.space2, after);
+    }
+
+    private void setWeight(int id, float weight) {
+        View v = findViewById(id);
+        LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) v.getLayoutParams();
+        params.weight = weight;
+        v.setLayoutParams(params);
+    }
+
+    public void setSideLabels(CharSequence[] labels) {
+        if (labels.length != mLabels.length) {
+            throw new IllegalArgumentException("Invalid number of labels");
+        }
+        for (int i = 0; i < mLabels.length; i++) {
+            mLabels[i].setText(labels[i]);
+        }
+    }
+
+    public void setBottomLabels(CharSequence[] labels) {
+        if (labels.length != mBottomLabels.length) {
+            throw new IllegalArgumentException("Invalid number of labels");
+        }
+        for (int i = 0; i < mBottomLabels.length; i++) {
+            mBottomLabels[i].setText(labels[i]);
+        }
+    }
+
+}

tests/robotests/src/com/android/settings/fuelgauge/BatteryHistoryPreferenceTest.java

@@ -30,7 +30,7 @@ import android.widget.TextView;
 import com.android.settings.R;
 import com.android.settings.SettingsRobolectricTestRunner;
 import com.android.settings.TestConfig;
-import com.android.settingslib.graph.UsageView;
+import com.android.settings.graph.UsageView;
 
 import org.junit.Before;
 import org.junit.Test;

tests/robotests/src/com/android/settings/graph/BottomLabelLayoutTest.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2017 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.graph;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+import android.view.View;
+import android.widget.LinearLayout;
+import android.widget.Space;
+
+import com.android.settings.R;
+import com.android.settings.TestConfig;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class BottomLabelLayoutTest {
+    private BottomLabelLayout mBottomLabelLayout;
+    private Context mContext;
+    private Space mSpace;
+
+    @Before
+    public void setUp() {
+        mContext = RuntimeEnvironment.application;
+        mBottomLabelLayout = new BottomLabelLayout(mContext, null);
+        mBottomLabelLayout.setOrientation(LinearLayout.HORIZONTAL);
+
+        mSpace = new Space(mContext);
+        mSpace.setId(R.id.spacer);
+        mBottomLabelLayout.addView(mSpace);
+    }
+
+    @Test
+    public void testSetStacked_stackedTrue_layoutVertical() {
+        mBottomLabelLayout.setStacked(true);
+
+        assertThat(mBottomLabelLayout.getOrientation()).isEqualTo(LinearLayout.VERTICAL);
+        assertThat(mSpace.getVisibility()).isEqualTo(View.GONE);
+    }
+
+    @Test
+    public void testSetStacked_stackedFalse_layoutHorizontal() {
+        mBottomLabelLayout.setStacked(false);
+
+        assertThat(mBottomLabelLayout.getOrientation()).isEqualTo(LinearLayout.HORIZONTAL);
+        assertThat(mSpace.getVisibility()).isEqualTo(View.VISIBLE);
+    }
+}