//獲取ConnectivityManager對象。 ConnectivityManager mana = getSystemService(Context.CONNECTIVITY_SERVICE); //NetworkInfo對象用來描述網絡信息。 //得到當前使用的網絡 NetworkInfo activeNetworkInfo=mana.getActiveNetworkInfo();//得到所有網絡 NetworkInfo[] infos = mana.getAllNetworkInfo();//獲取首選網絡 int networkType = mana.getNetworkPreference(); -----代碼實現------- manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE); NetworkInfo activeNetworkInfo = manager.getActiveNetworkInfo(); if(activeNetworkInfo==null||!activeNetworkInfo.isAvailable()){Toast.makeText(getApplicationContext(), "網絡連接不可用", Toast.LENGTH_SHORT).show(); }else{//可能聯網int networkType = activeNetworkInfo.getType();if(networkType == ConnectivityManager.TYPE_WIFI){Toast.makeText(getApplicationContext(), "當前成功連接WIFI"+activeNetworkInfo.isConnected(), Toast.LENGTH_SHORT).show();}else if(networkType==ConnectivityManager.TYPE_MOBILE){if(activeNetworkInfo.isRoaming()){Toast.makeText(getApplicationContext(), "當前成功連接漫游3G網絡"+activeNetworkInfo.isConnected(), Toast.LENGTH_SHORT).show();}else{Toast.makeText(getApplicationContext(), "當前成功連接非漫游3G網絡"+activeNetworkInfo.isConnected(), Toast.LENGTH_SHORT).show();}} }

添加權限：

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

轉載于:https://www.cnblogs.com/feike/archive/2013/01/03/2843089.html

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