Update data usage UX

Update the UX and dig the data usage screen out of a huge whole of
technical debt.  Switch every to use Preferences rather than standard
layouts and ListViews.

Split data usage into several fragments, all separated.

DataUsageSummary:
 - Shows a summary of the 'default' usage at the top, this will be
   the default sim on phones, or wifi if it has it, or ethernet
   as last attempt to show something.
 - Also has individual categories for each network type that has
   data, cell, wifi, and ethernet. Maybe should look into bt though?

DataUsageList:
- Takes a NetworkTemplate as an input, and can only be reached from
  the network specific categories in DataUsageSummary
- Shows a graph of current usage for that network and links to
  app detail page for any app.
- Has gear link to quick get to billing cycle screen if available

BillingCycleSettings:
 - Just a screen with the cycle day and warning/limits separated
   out from the data usage.

AppDataUsage:
 - App specific data usage details
 - May need some UX iteration given lack of clarity in the spec

Bug: 22459566
Change-Id: I0222d8d7ea7b75a9775207a6026ebbdcce8f5e46

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

@@ -0,0 +1,90 @@
+/*
+ * 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.datausage;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.net.NetworkPolicy;
+import android.net.NetworkTemplate;
+import android.os.Bundle;
+import android.os.RemoteException;
+import android.support.v7.preference.Preference;
+import android.util.AttributeSet;
+import com.android.settings.R;
+import com.android.settings.Utils;
+
+public class BillingCyclePreference extends Preference implements TemplatePreference {
+
+    private NetworkTemplate mTemplate;
+    private NetworkServices mServices;
+    private NetworkPolicy mPolicy;
+    private int mSubId;
+
+    public BillingCyclePreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public void onAttached() {
+        super.onAttached();
+        getContext().registerReceiver(mReceiver, new IntentFilter(
+                CellDataPreference.ACTION_DATA_ENABLED_CHANGED));
+    }
+
+    @Override
+    public void onDetached() {
+        getContext().unregisterReceiver(mReceiver);
+        super.onDetached();
+    }
+
+    @Override
+    public void setTemplate(NetworkTemplate template, int subId,
+            NetworkServices services) {
+        mTemplate = template;
+        mSubId = subId;
+        mServices = services;
+        mPolicy = services.mPolicyEditor.getPolicy(mTemplate);
+        setSummary(getContext().getString(R.string.billing_cycle_fragment_summary,
+                mPolicy != null ? mPolicy.cycleDay : 1));
+        setIntent(getIntent());
+    }
+
+    private void updateEnabled() {
+        try {
+            setEnabled(mPolicy != null && mServices.mNetworkService.isBandwidthControlEnabled()
+                    && mServices.mTelephonyManager.getDataEnabled(mSubId)
+                    && mServices.mUserManager.isAdminUser());
+        } catch (RemoteException e) {
+            setEnabled(false);
+        }
+    }
+
+    @Override
+    public Intent getIntent() {
+        Bundle args = new Bundle();
+        args.putParcelable(DataUsageList.EXTRA_NETWORK_TEMPLATE, mTemplate);
+        return Utils.onBuildStartFragmentIntent(getContext(), BillingCycleSettings.class.getName(),
+                args, null, 0, getTitle(), false);
+    }
+
+    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            updateEnabled();
+        }
+    };
+}