Added connectivity module.

connectivity/connectivity.android.ts

@@ -0,0 +1,31 @@
+import appModule = require("application");
+import common = require("connectivity/connectivity-common");
+
+declare var exports;
+require("utils/module-merge").merge(common, exports);
+
+var WIFI = "WIFI";
+var MOBILE = "MOBILE";
+
+function getActiveNetworkInfo(): android.net.NetworkInfo {
+    if (!appModule.android || !appModule.android.context) {
+        return null;
+    }
+
+    return appModule.android.context.getSystemService(android.content.Context.CONNECTIVITY_SERVICE).getActiveNetworkInfo();
+}
+
+export function getConnectionType(): number {
+    var activeNetworkInfo = getActiveNetworkInfo();
+    if (!activeNetworkInfo || !activeNetworkInfo.isConnected()) {
+        return common.connectionType.none;
+    }
+
+    var connectionType = activeNetworkInfo.getTypeName();
+    switch (connectionType) {
+        case WIFI:
+            return common.connectionType.wifi;
+        case MOBILE:
+            return common.connectionType.mobile;
+    }
+}