Android检查是否已经连接到网络

ConnectivityManager con=(ConnectivityManager)getSystemService(Activity.CONNECTIVITY_SERVICE);  
boolean wifi=con.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();  
boolean internet=con.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).isConnectedOrConnecting();  
if(wifi|internet){  
    //执行相关操作  
}else{  
    Toast.makeText(getApplicationContext(),  
            "请检查网络连接", Toast.LENGTH_LONG)  
            .show();  
}  

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

Android检查是否已经连接到网络

原文：http://blog.csdn.net/agonie201218/article/details/45151277