检测android设备是否已连接到互联网

本文介绍了检测android设备是否已连接到互联网的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

这是我的课程，检查设备是否已连接到互联网。

this is my class that checks if the device is connected to the internet.

import android.app.Activity; import android.content.Context; import android.ConnectivityManager; import android.NetworkInfo; import android.util.Log; import java.io.IOException; import java.HttpURLConnection; import java.URL; public class ConnectionDetector { private Context _context; public ConnectionDetector(Context context) { this._context = context; } public boolean isConnectingToInternet() { if (networkConnectivity()) { try { HttpURLConnection urlc = (HttpURLConnection) (new URL( "www.google").openConnection()); urlc.setRequestProperty("User-Agent", "Test"); urlc.setRequestProperty("Connection", "close"); urlc.setConnectTimeout(3000); urlc.setReadTimeout(4000); urlc.connect(); // networkcode2 = urlc.getResponseCode(); return (urlc.getResponseCode() == 200); } catch (IOException e) { return (false); } } else return false; } private boolean networkConnectivity() { ConnectivityManager cm = (ConnectivityManager) _context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo networkInfo = cm.getActiveNetworkInfo(); if (networkInfo != null && networkInfo.isConnected()) { return true; } return false; } }

然后我在这里称呼它似乎没有返回true或false。没有错误，我的应用程序不会崩溃，只是不打印任何内容。有人知道为什么吗？

then i call it here but it doesnt seem to return true or false. there are no errors and my app doesnt crash it just doesnt print anything out. anyone know why?

public void CheckInternet(){ // Boolean isInternetPresent; ConnectionDetector cd = new ConnectionDetector(getApplicationContext()); // isInternetPresent = cd.isConnectingToInternet(); if (cd.isConnectingToInternet()) { // Internet Connection is Present Log.i(TAG, "INTERNET IS GUUD"); } else { // Internet connection is not present // Ask user to connect to Internet Log.i(TAG, "INTERNET IS NOOOO GUUD"); } }

推荐答案

创建一个类：

public class Utility { public static boolean isNetworkAvailable(Context context) { ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo(); return activeNetworkInfo != null && activeNetworkInfo.isConnected(); } }

然后您从活动中调用methode，它将返回true或否：

Then you call methode from activity, it will return true or false:

Utility.isNetworkAvailable(AnyActivity.this);

别忘了向Android清单添加权限

And don't forget to add permission to android manifest

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <uses-permission android:name="android.permission.INTERNET"></uses-permission>