互联网监听器Android示例

互联网监听器Android示例

为此创建一个广播接收器，并将其注册到清单文件中。

首先创建一个新类

NetworkStateReceiver

并扩展BroadcastReceiver。

public class NetworkStateReceiver extends BroadcastReceiver {    public void onReceive(Context context, Intent intent) {     Log.d("app","Network connectivity change");     if(intent.getExtras()!=null) {        NetworkInfo ni=(NetworkInfo) intent.getExtras().get(ConnectivityManager.EXTRA_NETWORK_INFO);        if(ni!=null && ni.getState()==NetworkInfo.State.CONNECTED) { Log.i("app","Network "+ni.getTypeName()+" connected");        }     }     if(intent.getExtras().getBoolean(ConnectivityManager.EXTRA_NO_CONNECTIVITY,Boolean.FALSE)) { Log.d("app","There's no network connectivity");     }   }}

将此代码放在“ application”元素下的AndroidManifest.xml中：

<receiver android:name=".NetworkStateReceiver">   <intent-filter>      <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />   </intent-filter></receiver>

并添加此权限

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

编辑

此代码仅检测连接性变化，但无法判断其连接的网络是否可以访问互联网。使用此方法检查-

public static boolean hasActiveInternetConnection(Context context) {    if (isNetworkAvailable(context)) {        try { HttpURLConnection urlc = (HttpURLConnection) (new URL("http://www.google.com").openConnection()); urlc.setRequestProperty("User-Agent", "Test"); urlc.setRequestProperty("Connection", "close"); urlc.setConnectTimeout(1500);  urlc.connect(); return (urlc.getResponseCode() == 200);        } catch (IOException e) {        Log.e(LOG_TAG, "Error checking internet connection", e);        }    } else {    Log.d(LOG_TAG, "No network available!");    }    return false;}