Android之检测外网连接性（ping）

2023-08-27 04:49| 来源: 网络整理| 查看: 265

有时候网络状态显示正常，但是实际网络是不能连接外网，故需通过http方式或者ping方式来检测。

外网连接性检测工具类

package com.android.demo.utils; import android.util.Log; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.nio.charset.StandardCharsets; /** * 检测是否可以连接到外网的工具类 */ public class PingNetworkUtils { private static final String TAG = "PingNetworkUtils >>> "; private static PingNetWorkListener pingNetWorkListener; /** * ping监听器接口定义 */ public interface PingNetWorkListener { void onPingState(boolean isConnected); } /** * 设置ping结果反馈监听器 * @param listener 监听器 */ public static void setPingListener(PingNetWorkListener listener) { pingNetWorkListener = listener; } /** * 开始ping www.baidu.com，异步处理 */ public static void startPing() { Log.d(TAG, " ========= startPing ========== "); new Thread(new Runnable() { @Override public void run() { if (pingNetWorkListener != null) { int state = checkNetworkByHttp(); if (state == 2) { boolean ret = checkNetworkByPing(); pingNetWorkListener.onPingState(ret); } else if (state == 0){ pingNetWorkListener.onPingState(true); } else { pingNetWorkListener.onPingState(false); } } else { Log.d(TAG, "[startPing] pingNetWorkListener is null."); } } }).start(); } /** * 检测网络是否能连接外网，通过http方式 * @return 0 连通 1 不连通 2 异常 */ public static int checkNetworkByHttp() { Log.d(TAG, "start to connect www.baidu.com by http...."); int isConnected; try { URL url = new URL("http://www.baidu.com/"); HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); if (httpURLConnection == null) { Log.d(TAG, "[checkNetworkByHttp] httpURLConnection is null!"); return 1; } httpURLConnection.setConnectTimeout(2000); httpURLConnection.setReadTimeout(2000); InputStream inputStream = httpURLConnection.getInputStream(); if (inputStream == null) { Log.d(TAG, "[checkNetworkByHttp] inputStream is null!"); return 1; } InputStreamReader inputStreamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8); BufferedReader bufferedReader = new BufferedReader(inputStreamReader); if (bufferedReader.readLine().length() > 1) { isConnected = 0; Log.d(TAG, "connected baidu by http success!"); } else { isConnected = 1; Log.d(TAG, "connected baidu by http failed!"); } bufferedReader.close(); inputStreamReader.close(); inputStream.close(); } catch (IOException e) { isConnected = 2; Log.d(TAG, "connected baidu wlan by http exception!"); e.printStackTrace(); } return isConnected; } /** * 检测网络是否能连接外网，通过ping方式 * @return true/false */ public static boolean checkNetworkByPing() { Log.d(TAG, "start to connect www.baidu.com by ping...."); try { // ping 10次每次超时1秒，阻塞处理 Process process = Runtime.getRuntime().exec("ping -c 10 -W 1 www.baidu.com"); if (process == null) { Log.d(TAG, " ping process is null."); return false; } // 读取ping的内容 InputStream input = process.getInputStream(); if (input == null) { Log.d(TAG, " process InputStream is null."); return false; } BufferedReader in = new BufferedReader(new InputStreamReader(input)); StringBuilder stringBuffer = new StringBuilder(); String content; while ((content = in.readLine()) != null) { stringBuffer.append(content).append("\n"); } Log.d(TAG, "ping result : \n" + stringBuffer.toString()); if (stringBuffer.length() > 0 && !stringBuffer.toString().contains("100% packet loss")) { return true; } // /* ping的状态, 不调用waitFor接口，会导致卡住异常 */ // int status; // try { // status = process.waitFor(); // if (status == 0) { // isConnected = true; // Log.d(TAG, "connected baidu by ping success."); // } else { // isConnected = false; // Log.d(TAG, "connected baidu by ping failed."); // } // } catch (InterruptedException e) { // e.printStackTrace(); // } } catch (IOException e) { Log.e(TAG, "connected baidu by ping failed because of IOException."); e.printStackTrace(); } return false; } }

网络检测工具类实例：

private void checkNetwork() { PingNetworkUtils.setPingListener(new PingNetworkUtils.PingNetWorkListener() { @Override public void onPingState(boolean isConnected) { // isConnected is the state of wlan } }); PingNetworkUtils.startPing(); }

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