java.lang.InstantiationException: class has no zero argument constructor

Question

I am trying to use a BroadcastReceiver as an inner class to track the network state but I got the exception in the title. What should I do to fix this problem?

public class NetworkChangeReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        final ConnectivityManager connMgr = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);

        final android.net.NetworkInfo wifi = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        final android.net.NetworkInfo mobile = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

        if (wifi.isAvailable() || mobile.isAvailable()) {
            setupData();
            Log.d("Netowk Available ", "Flag No 1");
        }
    }
}

score 108 · Accepted Answer · answered Feb 05 '16 at 19:10

108

Your

inner Broadcast receiver must be static ( to be registered through Manifest)

OR

Non-static broadcast receiver must be registered and unregistered inside the Parent class

for this.

I was using an Inner broadcast reciver, without registering it within the class. Either make it static and register in Manifest , or Make it non static and register and unregister inside the parent class .

answered Feb 05 '16 at 19:10

Ajji

3,068
2
30
31

3

Had the same problem with an Activity implemented as an inner class. Same solution – declaring the inner class as static fixed it. – user149408 Jul 06 '16 at 19:00

Mehmet K · Answer 2 · 2018-02-19T15:15:03.223

16

A non-static inner class cannot be registered via the AndroidManifest.xml. You can either:

Register it dynamically as outlined in this thread, and remove the empty constructor.

Or,

Make your inner class static, and register it in the AndroidManifext.xml.

edited Feb 19 '18 at 15:15

answered Apr 29 '15 at 14:58

Mehmet K

2,805
1
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when i remove the empty constructor the same exception is happening – Karim Abdell Salam Apr 29 '15 at 15:01
2

Aha, turns out that is the problem. An (non-static) inner class cannot be instantiated by Android via the AndroidManifest.xml (Android developer documentation on BroadcastReceiver). Check [this thread](http://stackoverflow.com/questions/3608955/receiver-as-inner-class-in-android) out, and dynamically register your receiver. – Mehmet K Apr 29 '15 at 15:11
@KarimAbdellSalam I've edited my answer too, so make sure you accept my answer if it answers your question :) – Mehmet K May 01 '15 at 15:27

score 1 · Answer 3 · answered Aug 28 '18 at 15:40

1

just make your Receiver Class static like:

public [static] class ReceiverClass extends BroadcastReceiver

answered Aug 28 '18 at 15:40

Hadi

544
1
8
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score -2 · Answer 4 · answered Sep 21 '15 at 08:36

-2

e~~I just meet that problem,and I refactor the class NetworkChangeReceiver to an another place

answered Sep 21 '15 at 08:36

user5320550

11
3

java.lang.InstantiationException: class has no zero argument constructor

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