1 files changed, 66 insertions, 0 deletions
diff --git a/src/com/android/tv/util/NetworkUtils.java b/src/com/android/tv/util/NetworkUtils.java
new file mode 100644
index 00000000..ed3ce383
--- /dev/null
+++ b/src/com/android/tv/util/NetworkUtils.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2015 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.tv.util;
+
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+import android.support.annotation.Nullable;
+import android.support.annotation.WorkerThread;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+/**
+ * A utility class to check the connectivity.
+ */
+@WorkerThread
+public class NetworkUtils {
+    private static final String GENERATE_204 = "http://clients3.google.com/generate_204";
+
+    /**
+     * Checks if the internet connection is available.
+     */
+    public static boolean isNetworkAvailable(@Nullable ConnectivityManager connectivityManager) {
+        if (connectivityManager == null) {
+            return false;
+        }
+        NetworkInfo info = connectivityManager.getActiveNetworkInfo();
+        if (info == null || !info.isConnected()) {
+            return false;
+        }
+        HttpURLConnection connection = null;
+        try {
+            connection = (HttpURLConnection) new URL(GENERATE_204).openConnection();
+            connection.setInstanceFollowRedirects(false);
+            connection.setDefaultUseCaches(false);
+            connection.setUseCaches(false);
+            if (connection.getResponseCode() == HttpURLConnection.HTTP_NO_CONTENT) {
+                return true;
+            }
+        } catch (IOException e) {
+            // Does nothing.
+        } finally {
+            if (connection != null) {
+                connection.disconnect();
+            }
+        }
+        return false;
+    }
+
+    private NetworkUtils() { }
+}