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/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);
+    }
+}