如何检查Android上的互联网接入?InetAddress从不超时

我得到了一个AsyncTask，应该检查对主机名的网络访问。但是doInBackground()永远不会超时。有人知道吗?

public class HostAvailabilityTask extends AsyncTask<String, Void, Boolean> {

    private Main main;

    public HostAvailabilityTask(Main main) {
        this.main = main;
    }

    protected Boolean doInBackground(String... params) {
        Main.Log("doInBackground() isHostAvailable():"+params[0]);

        try {
            return InetAddress.getByName(params[0]).isReachable(30); 
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;       
    }

    protected void onPostExecute(Boolean... result) {
        Main.Log("onPostExecute()");

        if(result[0] == false) {
            main.setContentView(R.layout.splash);
            return;
        }

        main.continueAfterHostCheck();
    }   
}

当前回答

Android提供了ConnectivityManager类来了解互联网连接状态。下面的方法将是非常有用的，以了解互联网连接状态。

首先在AndroidManifest.xml中添加INTERNET和ACCESS_NETWORK_STATE权限

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

然后使用下面的方法检查设备是否连接到互联网。如果设备已连接到互联网，此方法将返回true。

public boolean isInternetAvailable(Context context) {
    ConnectivityManager connectivityManager = (ConnectivityManager) 
    context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = connectivityManager.getActiveNetworkInfo();
    return activeNetwork != null
            && activeNetwork.isConnectedOrConnecting();
}

参考链接:—http://www.androidtutorialshub.com/android-check-internet-connection-status/

2017-05-10 10:06:03

其他回答

下面是我用于可达性检查的Kotlin版本，

芬兰湾的科特林MyReachability

object MyReachability {

    private val REACHABILITY_SERVER = "http://google.com" // can be any URL you want

    private fun hasNetworkAvailable(context: Context): Boolean {
        val service = Context.CONNECTIVITY_SERVICE
        val manager = context.getSystemService(service) as ConnectivityManager?
        val network = manager?.activeNetworkInfo
        Log.d(classTag, "hasNetworkAvailable: ${(network != null)}")
        return (network != null)
    }

    fun hasInternetConnected(context: Context): Boolean {
        if (hasNetworkAvailable(context)) {
            try {
                val connection = URL(REACHABILITY_SERVER).openConnection() as HttpURLConnection
                connection.setRequestProperty("User-Agent", "Test")
                connection.setRequestProperty("Connection", "close")
                connection.connectTimeout = 1500
                connection.connect()
                Log.d(classTag, "hasInternetConnected: ${(connection.responseCode == 200)}")
                return (connection.responseCode == 200)
            } catch (e: IOException) {
                Log.e(classTag, "Error checking internet connection", e)
            }
        } else {
            Log.w(classTag, "No network available!")
        }
        Log.d(classTag, "hasInternetConnected: false")
        return false
    }
}

您甚至可以根据策略和限制将REACHABILITY_SERVER作为参数传递，例如，当您在中国时，您可以检查https://baidu.com而不是https://google.com。

调用示例中,

val webLoaderThread = Thread {
   if (MyReachability.hasInternetConnected(this)){
       runOnUiThread {
           //mWebView.loadUrl(LANDING_SERVER) // connected
       }
   } else {
       runOnUiThread {
           //showDialogNoNetwork() // not connected
       }
   }
}
webLoaderThread.start()

安卓系统权限

不要忘记将以下权限添加到你的AndroidManifest.xml中

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

2019-07-02 05:27:21

在芬兰湾的科特林:

class UtilityMethods {
companion object {
    fun isConnected(activity: Activity): Boolean {
        val connectivityManager: ConnectivityManager =
                activity.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        return null != connectivityManager.activeNetworkInfo
    }
}}

在Activity类中调用isConnected如下:

UtilityMethods.isConnected(this)

内部片段类如下:

UtilityMethods.isConnected(activity)

2018-05-25 05:33:39

非常重要的是检查我们是否与isAvailable()有连接，以及是否可能与isConnected()建立连接

private static ConnectivityManager manager;

public static boolean isOnline(Context context) {
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
    return networkInfo != null && networkInfo.isAvailable() && networkInfo.isConnected();
}

你可以取消网络活动WiFi的类型:

public static boolean isConnectedWifi(Context context) {
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
    return networkInfo != null && networkInfo.getType() == ConnectivityManager.TYPE_WIFI;
}

或手机Móvil:

public static boolean isConnectedMobile(Context context) {
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
    return networkInfo != null && networkInfo.getType() == ConnectivityManager.TYPE_MOBILE;
}

不要忘记权限:

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

2017-01-02 18:23:18

从以下链接找到并修改(!):

在你的manifest文件中至少添加:

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

如果您正在访问它，您可能已经拥有INTERNET权限。那么一个允许测试连通性的布尔函数是:

private boolean checkInternetConnection() {
    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    // test for connection
    if (cm.getActiveNetworkInfo() != null
            && cm.getActiveNetworkInfo().isAvailable()
            && cm.getActiveNetworkInfo().isConnected()) {
        return true;
    } else {
        Log.v(TAG, "Internet Connection Not Present");
        return false;
    }
}

2011-01-11 10:29:01