How do you check the internet connection in android?

Question

I want to check the internet connectivity in each activity. If it is lost a message should be displayed.

Can any one guide me how to achieve this?

Try this library that I wrote. https://github.com/muddassir235/connection_checker It provides a listener with onConnected, onConnectionSlow and onDisconnected methods. — Muddassir Ahmed, Aug 29 '20 at 00:17

William · Answer 1 · 2015-04-18T01:56:38.243

126

Only one connection can be active at any one point. So a simpler answer is:

final ConnectivityManager conMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo activeNetwork = conMgr.getActiveNetworkInfo();
if (activeNetwork != null && activeNetwork.isConnected()) {
    // notify user you are online
} else {
    // notify user you are not online
}

It also caters for any new type of network such as ConnectivityManager#TYPE_WIMAX

Also make sure that you have the required permission to monitor the network state. You need to add this permission to your AndroidManifest.xml:

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

edited Apr 18 '15 at 01:56

answered Apr 25 '11 at 12:02

William

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There is a method name `isConnected()` for Network info could that replace your line `.getState() == ...` and make it even simpler? – bytebender Jul 10 '12 at 18:22
Nice pick up #bytebender. I have amended the solution. Even simpler now :-) – William Jul 11 '12 at 21:53
9

Don't forget to add `` to AndroidManifest.xml – Kuitsi Feb 25 '13 at 17:56

score 63 · Accepted Answer · edited Dec 26 '16 at 07:33

63

You can use the ConnectivityManager to check the network state.

ConnectivityManager conMgr = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED 
    || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED ) {

    // notify user you are online

}
else if ( conMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.DISCONNECTED 
    || conMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.DISCONNECTED) {

    // notify user you are not online
}

Note that the constants ConnectivityManager.TYPE_MOBILE and ConnectivityManager.TYPE_WIFI represent connection types and these two values are not exhaustive. See here for an exhaustive list.

Also make sure that you have the required permission to monitor the network state. You need to add this permission to your AndroidManifest.xml:

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

edited Dec 26 '16 at 07:33

rsc

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answered Feb 24 '10 at 14:47

Dan

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it is giving me following error ConnectivityService: Neither user 10026 nor current process has android.permission.ACCESS_NETWORK_STATE. on conMgr.getNetworkInfo – UMAR-MOBITSOLUTIONS Feb 25 '10 at 13:59
29

You have to add this line to your AndroidManifest.xml: – Sarp Centel Feb 25 '10 at 20:17
2

ok one thing i have noticed.. when wifi is connected to wireless modem internet coverage is there or not it always says yes you are conected it only checks wifi conectivity not internet connectivity so how to handle such a situation ? – UMAR-MOBITSOLUTIONS Nov 19 '10 at 08:11
3

This won't work al the time, you need to loop through all the network types: NetworkInfo infos[] = conMgr.getAllNetworkInfo(); for(NetworkInfo info : infos){} around the if, and no else. – stephane k. Jul 29 '11 at 16:55
Thanks.. I needed it seriously. – Ayush Pateria Jan 11 '12 at 16:53
1

See the response from William for a more concise and "correct" approach. This approach is not exhaustive, as already pointed out. – Tanner Perrien Mar 08 '12 at 13:56
2

wrong code. if the network number 0 is disabled, state of the network 0 will not be checked, but it can be connecting... – Korniltsev Anatoly Jul 02 '12 at 07:43
@SarpCentel I've added that permission but it still raised the same error – Duc Tran Dec 14 '12 at 14:04
Not exhaustive, but sufficient for most cases, unless user is tethering from bluetooth. – Karan Apr 13 '15 at 06:40
It is deprecated in marshmallow – pola sai ram Feb 23 '16 at 11:15

score 10 · Answer 3 · edited Nov 23 '11 at 21:58

You can do this, for various types of network status

public void  checkNetworkStatus(){

    final ConnectivityManager connMgr = (ConnectivityManager)
     this.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() ){

     Toast.makeText(this, "Wifi" , Toast.LENGTH_LONG).show();
     }
     else if( mobile.isAvailable() ){

     Toast.makeText(this, "Mobile 3G " , Toast.LENGTH_LONG).show();
     }
     else
     {

         Toast.makeText(this, "No Network " , Toast.LENGTH_LONG).show();
     }

}

score 7 · Answer 4 · answered Mar 08 '13 at 06:28

You can check network coverage and data availability of Mobile and wi-fi directly with

For Network coverage availability,

private boolean isNetworkAvailable()
{
 ConnectivityManager conxMgr = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);

 NetworkInfo mobileNwInfo = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
 NetworkInfo wifiNwInfo   = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

return ((mobileNwInfo== null ? false : mobileNwInfo.isAvailable()) || (wifiNwInfo == null ? false : wifiNwInfo.isAvailable()));

}

For Data availability if network available

private boolean isDataAvailable()
{
  ConnectivityManager conxMgr = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);

 NetworkInfo mobileNwInfo = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
 NetworkInfo wifiNwInfo   = conxMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

return ((mobileNwInfo== null? false : mobileNwInfo.isConnected() )|| (wifiNwInfo == null? false : wifiNwInfo.isConnected()));
}

score 5 · Answer 5 · edited Oct 22 '11 at 07:43

5

Correction

if ( conMgr.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED 
    ||  conMgr.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTING  ) {
   //notify user you are online
}

should be

if ( conMgr.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED 
    ||  conMgr.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED ) {
    //notify user you are online
}

edited Oct 22 '11 at 07:43

Raj

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answered Nov 18 '10 at 11:16

Sudhakar Chavali

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1

ok one thing i have noticed.. when wifi is connected to wireless modem internet coverage is there or not it always says yes you are conected it only checks wifi conectivity not internet connectivity so how to handle such a situation ? – UMAR-MOBITSOLUTIONS Nov 19 '10 at 08:10

score 3 · Answer 6 · answered Sep 05 '13 at 13:34

Register a broadcast receiver to handle CONNECTIVITY_ACTION. See this full example. You should update a static variable 'connectionAvailable' that will be accessible everywhere and everytime through its respective getter.

Remember to declare the broadcast receiver in the manifest file:

<receiver android:name=".NetworkConnectivityReceiver" android:enabled="true">
    <intent-filter>
        <action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
    </intent-filter>
</receiver>

On the matter of 'checking in each activity', may be you would be interested in using a BaseActivity extended by your activities and managing the test of connectivity and displaying the message.

Also, note that using events (not polling from activities) will be more efficient.

score 1 · Answer 7 · answered Apr 25 '13 at 13:36

1

You are not using ConnectivityManager.getNetworkInfo(0).getState() and ConnectivityManager.getNetworkInfo(1).getState() properly, instead of hardcoding the values (1) and (0) use ConnectivityManager.TYPE_WIFI and ConnectivityManager.TYPE_MOBILE

answered Apr 25 '13 at 13:36

Naskov

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VikingGlen · Answer 8 · 2013-05-29T01:46:27.427

This is a boolean check to see if you have network access. It doesn't determine what kind of network access - mobile, wifi..., it just checks to see if you're online.

boolean mobileNwInfo = false;  
ConnectivityManager conxMgr = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);  
try { mobileNwInfo = conxMgr.getActiveNetworkInfo().isConnected(); }  
catch (NullPointerException e) { mobileNwInfo = false; }  
if ( mobileNwInfo == false ) {
  // Your code goes here...
}

How do you check the internet connection in android?

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