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/*
* 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() { }
}
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