Refactor few public static methods.

Move public static methods from DataUsageSummary to DataUsageBase.

Bug: 62349208
Test: make RunSettingsRoboTests -j40
Change-Id: I632f75f4c4f370fb225a9787267043fec20994e5

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

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2017 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 static android.net.ConnectivityManager.TYPE_WIFI;
+
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.net.NetworkTemplate;
+import android.os.SystemProperties;
+import android.telephony.SubscriptionInfo;
+import android.telephony.SubscriptionManager;
+import android.telephony.TelephonyManager;
+import java.util.List;
+
+/**
+ * Utility methods for data usage classes.
+ */
+public final class DataUsageUtils {
+    static final boolean TEST_RADIOS = false;
+    static final String TEST_RADIOS_PROP = "test.radios";
+
+    private DataUsageUtils() {
+    }
+
+    /**
+     * Returns whether device has mobile data.
+     * TODO: This is the opposite to Utils.isWifiOnly(), it should be refactored into 1 method.
+     */
+    static boolean hasMobileData(Context context) {
+        ConnectivityManager connectivityManager = ConnectivityManager.from(context);
+        return connectivityManager != null && connectivityManager
+                .isNetworkSupported(ConnectivityManager.TYPE_MOBILE);
+    }
+
+    /**
+     * Whether device has a Wi-Fi data radio.
+     */
+    public static boolean hasWifiRadio(Context context) {
+        if (TEST_RADIOS) {
+            return SystemProperties.get(TEST_RADIOS_PROP).contains("wifi");
+        }
+
+        ConnectivityManager connectivityManager = ConnectivityManager.from(context);
+        return connectivityManager != null && connectivityManager.isNetworkSupported(TYPE_WIFI);
+    }
+
+    /**
+     * Returns the default subscription if available else returns
+     * SubscriptionManager#INVALID_SUBSCRIPTION_ID
+     */
+    public static int getDefaultSubscriptionId(Context context) {
+        SubscriptionManager subManager = SubscriptionManager.from(context);
+        if (subManager == null) {
+            return SubscriptionManager.INVALID_SUBSCRIPTION_ID;
+        }
+        SubscriptionInfo subscriptionInfo = subManager.getDefaultDataSubscriptionInfo();
+        if (subscriptionInfo == null) {
+            List<SubscriptionInfo> list = subManager.getAllSubscriptionInfoList();
+            if (list.size() == 0) {
+                return SubscriptionManager.INVALID_SUBSCRIPTION_ID;
+            }
+            subscriptionInfo = list.get(0);
+        }
+        return subscriptionInfo.getSubscriptionId();
+    }
+
+    /**
+     * Returns the default network template based on the availability of mobile data, Wifi. Returns
+     * ethernet template if both mobile data and Wifi are not available.
+     */
+    static NetworkTemplate getDefaultTemplate(Context context, int defaultSubId) {
+        if (hasMobileData(context) && defaultSubId != SubscriptionManager.INVALID_SUBSCRIPTION_ID) {
+            TelephonyManager telephonyManager = TelephonyManager.from(context);
+            NetworkTemplate mobileAll = NetworkTemplate.buildTemplateMobileAll(
+                    telephonyManager.getSubscriberId(defaultSubId));
+            return NetworkTemplate.normalize(mobileAll,
+                    telephonyManager.getMergedSubscriberIds());
+        } else if (hasWifiRadio(context)) {
+            return NetworkTemplate.buildTemplateWifiWildcard();
+        } else {
+            return NetworkTemplate.buildTemplateEthernet();
+        }
+    }
+}