Controls to set expensive (metered) networks.

Add UI to change metered flag on NetworkPolicy, and support Wi-Fi
policies per-SSID.  Create Wi-Fi policies as needed, but leave cycle
undefined.

Only show and mutate mobile policies when SIM state is ready.

Bug: 3001465, 3291052
Change-Id: I481a202fe0e68fc2f5adfd3b3a6f40347d2b168c

src/com/android/settings/net/DataUsageMeteredSettings.java

@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2012 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.net;
+
+import static com.android.settings.DataUsageSummary.hasReadyMobileRadio;
+import static com.android.settings.DataUsageSummary.hasWifiRadio;
+
+import android.content.Context;
+import android.net.NetworkPolicy;
+import android.net.NetworkPolicyManager;
+import android.net.NetworkTemplate;
+import android.net.wifi.WifiConfiguration;
+import android.net.wifi.WifiManager;
+import android.os.Bundle;
+import android.preference.CheckBoxPreference;
+import android.preference.Preference;
+import android.preference.PreferenceCategory;
+import android.telephony.TelephonyManager;
+
+import com.android.settings.R;
+import com.android.settings.SettingsPreferenceFragment;
+
+/**
+ * Panel to configure {@link NetworkPolicy#metered} for networks.
+ */
+public class DataUsageMeteredSettings extends SettingsPreferenceFragment {
+
+    private NetworkPolicyManager mPolicyManager;
+    private WifiManager mWifiManager;
+
+    private NetworkPolicyEditor mPolicyEditor;
+
+    private PreferenceCategory mMobileCategory;
+    private PreferenceCategory mWifiCategory;
+
+    @Override
+    public void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+        final Context context = getActivity();
+
+        mPolicyManager = NetworkPolicyManager.from(context);
+        mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
+
+        mPolicyEditor = new NetworkPolicyEditor(mPolicyManager);
+        mPolicyEditor.read();
+
+        addPreferencesFromResource(R.xml.data_usage_metered_prefs);
+        mMobileCategory = (PreferenceCategory) findPreference("mobile");
+        mWifiCategory = (PreferenceCategory) findPreference("wifi");
+
+        updateNetworks(context);
+
+    }
+
+    private void updateNetworks(Context context) {
+        if (hasReadyMobileRadio(context)) {
+            mMobileCategory.removeAll();
+            mMobileCategory.addPreference(buildMobilePref(context));
+        } else {
+            getPreferenceScreen().removePreference(mMobileCategory);
+        }
+
+        if (hasWifiRadio(context)) {
+            mWifiCategory.removeAll();
+            for (WifiConfiguration config : mWifiManager.getConfiguredNetworks()) {
+                if (config.SSID != null) {
+                    mWifiCategory.addPreference(buildWifiPref(context, config));
+                }
+            }
+        } else {
+            getPreferenceScreen().removePreference(mWifiCategory);
+        }
+    }
+
+    private Preference buildMobilePref(Context context) {
+        final TelephonyManager tele = TelephonyManager.from(context);
+        final NetworkTemplate template = NetworkTemplate.buildTemplateMobileAll(
+                tele.getSubscriberId());
+        final MeteredPreference pref = new MeteredPreference(context, template);
+        pref.setTitle(tele.getNetworkOperatorName());
+        return pref;
+    }
+
+    private Preference buildWifiPref(Context context, WifiConfiguration config) {
+        final String networkId = removeDoubleQuotes(config.SSID);
+        final NetworkTemplate template = NetworkTemplate.buildTemplateWifi(networkId);
+        final MeteredPreference pref = new MeteredPreference(context, template);
+        pref.setTitle(networkId);
+        return pref;
+    }
+
+    private class MeteredPreference extends CheckBoxPreference {
+        private final NetworkTemplate mTemplate;
+
+        public MeteredPreference(Context context, NetworkTemplate template) {
+            super(context);
+            mTemplate = template;
+
+            setPersistent(false);
+            setChecked(mPolicyEditor.getPolicyMetered(mTemplate));
+        }
+
+        @Override
+        protected void notifyChanged() {
+            super.notifyChanged();
+            mPolicyEditor.setPolicyMetered(mTemplate, isChecked());
+        }
+    }
+
+
+    private static String removeDoubleQuotes(String string) {
+        final int length = string.length();
+        if ((length > 1) && (string.charAt(0) == '"') && (string.charAt(length - 1) == '"')) {
+            return string.substring(1, length - 1);
+        }
+        return string;
+    }
+
+}