android-如何检查手机和无线是否连接

方法1：

 ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
NetworkInfo info = manager.getActiveNetworkInfo(); 
if(info!=null && info.isConnected()){ 
    return true; 
}else{ 
    return false; 
} 

方法2：

TelephonyManager manager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE); 
int state = manager.getDataState(); 
if(state == TelephonyManager.DATA_CONNECTED){ 
     return true; 
}else{ 
     return false; 
}