Surface storage usage of other users.

Bring up separate StorageMeasurement sessions bound to other users
on device, and surface their total usage as teal colors.  Exclude
app code size when measuring secondary users.  Shift preferences to
using keys instead of fragile index ordering.

Bug: 7003520
Change-Id: I214d0b223e53955df71104502596743f049f2027

src/com/android/settings/deviceinfo/StorageItemPreference.java

@@ -0,0 +1,65 @@
+/*
+ * 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.deviceinfo;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Color;
+import android.graphics.drawable.ShapeDrawable;
+import android.graphics.drawable.shapes.RectShape;
+import android.preference.Preference;
+
+import com.android.settings.R;
+
+public class StorageItemPreference extends Preference {
+
+    private int mColor = Color.MAGENTA;
+
+    public StorageItemPreference(Context context, String key, int titleRes, int colorRes) {
+        this(context, key, context.getText(titleRes), colorRes);
+    }
+
+    public StorageItemPreference(Context context, String key, CharSequence title, int colorRes) {
+        super(context);
+        //setLayoutResource(R.layout.app_percentage_item);
+
+        if (colorRes != 0) {
+            mColor = context.getResources().getColor(colorRes);
+
+            final Resources res = context.getResources();
+            final int width = res.getDimensionPixelSize(R.dimen.device_memory_usage_button_width);
+            final int height = res.getDimensionPixelSize(R.dimen.device_memory_usage_button_height);
+            setIcon(createRectShape(width, height, mColor));
+        }
+
+        setKey(key);
+        setTitle(title);
+        setSummary(R.string.memory_calculating_size);
+    }
+
+    private static ShapeDrawable createRectShape(int width, int height, int color) {
+        ShapeDrawable shape = new ShapeDrawable(new RectShape());
+        shape.setIntrinsicHeight(height);
+        shape.setIntrinsicWidth(width);
+        shape.getPaint().setColor(color);
+        return shape;
+    }
+
+    public int getColor() {
+        return mColor;
+    }
+}