Android中判断手机是否联网实例

首先在AndroidManifest.xml中添加与连接网络相关的权限：

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

判断是否联网代码:

ConnectivityManager connectivityManager = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE); NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); if(networkInfo == null || !networkInfo.isAvailable()) { //当前无可用网络 } else { //当前有可用网络 }