我用接收器是为了知道手机是否有网络连接。
我用的是这个代码:
public class SearchFragment extends Fragment {
private Boolean netOk = false;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
ConnectionChangeReceiver1 netReceiver = new ConnectionChangeReceiver1();
IntentFilter filterNet = new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");
getActivity().registerReceiver(netReceiver, filterNet);
}
@Override
public void onResume() {
super.onResume();
if(netOk){
Toast.makeText(getActivity(),"U GOT NET" , Toast.LENGTH_LONG).show();
}else{
Toast.makeText(getActivity(),"U DON'T GOT NET" , Toast.LENGTH_LONG).show();
}
}
public class ConnectionChangeReceiver1 extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetInfo = connectivityManager
.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
boolean isConnected = activeNetInfo != null
&& activeNetInfo.isConnectedOrConnecting();
if (isConnected){
netOk= true;
}else{
netOk= false;
}
}
}
}
问题是,netOk仍然是假的。现在我了解到,只有在onCreate
、onStart
、onResume
之后才调用接收类。
所以问题是:如果我想在向用户显示活动之前知道是否有互联网连接,我该怎么办?
发布于 2013-12-26 10:19:37
您可以尝试此方法以获得同步响应。
public static boolean checkInternetConnection(Context context) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
// test for connection
if (cm != null && cm.getActiveNetworkInfo().isConnected()
&& cm.getActiveNetworkInfo().isAvailable()) {
return true;
}
return false;
}
https://stackoverflow.com/questions/20782965
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