| /* |
| * 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() { } |
| } |