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

/** 
* 测试网络 
*/ 
public boolean TestNetWork() 
{ 
if(context != null){ 
ConnectivityManager connectivityManager =(ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE); 

NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo(); 
if(activeNetInfo==null){ 

handler.sendEmptyMessage(8); 
return false; 
} 
boolean netInfo = activeNetInfo.isAvailable(); 
if(!netInfo){ 
handler.sendEmptyMessage(8);  
return false; 
} 
} 
return true; 
}