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/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);
+        }
+    }
+
+}