CODEWITHSUNDEEP
androidwifigprs
NareshRavva
NareshRavva

Reputation: 863

how can i check net connection in android?

i have developed one application in that i have to check whether net is connected or not i use following code but its not working. can any one resolve my problem. my code is

public class AbcActivity extends Activity {
    Button b;
    private static final String tag = null;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        b=(Button)findViewById(R.id.button1);
        b.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                netCheckin();
            }
        });
    }
        private void netCheckin() {

            try {

                ConnectivityManager nInfo = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
                nInfo.getActiveNetworkInfo().isConnectedOrConnecting();

                Log.d(tag, "Net avail:"
                        + nInfo.getActiveNetworkInfo().isConnectedOrConnecting());

                ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
                NetworkInfo netInfo = cm.getActiveNetworkInfo();
                if (netInfo != null && netInfo.isConnectedOrConnecting()) {
                   Toast.makeText(getApplicationContext(), "net on", Toast.LENGTH_LONG).show();
                    Log.d(tag, "Network available:true");

                } else {
                     Toast.makeText(getApplicationContext(), "net OFF", Toast.LENGTH_LONG).show();
                    Log.d(tag, "Network available:false");

                }

            } catch (Exception e) {
               Log.e("error",""+e);
            }
        }

    }

i have give the android:name="android.permission.ACCESS_NETWORK_STATE"/> in my manifest file in above code my problem is when net is enable or disable it gives same output as "net on" (toast message).

Upvotes: 1

Views: 1108

Answers (4)

Rakhita Wickramatunge
Rakhita Wickramatunge

Reputation: 4503

// check internet connectivity
public static boolean isNetworkAvailable(Context context) {

    boolean networkStatus;
    try {

        ConnectivityManager connectivityManager = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = connectivityManager
                .getActiveNetworkInfo();

        networkStatus = (activeNetworkInfo != null && activeNetworkInfo.isConnected()) ? true : false;

    } catch (Exception e) {

        e.printStackTrace();
        DinotaLogger.log(e, Level.SEVERE);
        networkStatus = false;

    }

    return networkStatus;
}

Please make sure to put in manifest file. If you are using an emulator to check this, press F8 to disable network access. This works fine with android 2.3.3 emulator.

Upvotes: 1

Dinesh Sharma
Dinesh Sharma

Reputation: 11571

At the top of your onCreate method , use

if(!checkInternetConnection()){
            // network connnectivity error , show some dialog here and exit from the app 

        }

where 

private boolean checkInternetConnection() {

            ConnectivityManager conMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
            // ARE WE CONNECTED TO THE NET
            if (conMgr.getActiveNetworkInfo() != null
                    && conMgr.getActiveNetworkInfo().isAvailable()
                    && conMgr.getActiveNetworkInfo().isConnected()) {

                return true;

            } else {
                Log.v("", "Internet Connection Not Present");
                return false;
            }
        }

Hope this wil help you.

Upvotes: 1

Hussain
Hussain

Reputation: 5562

Just try the below code so that u can check whether there is internet connected or not. This code is working for me.Also u can check if the internet is connected through mobile then it is in roaming or not.

    int typeOfConnection = 0;
    //Gets the system service of the connectivity.
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo[] netInfo = connectivityManager.getAllNetworkInfo();

    //Checks whether the connectivity type is WIFI or MOBILE.
    for (NetworkInfo networkInfo : netInfo)
    {
        if (networkInfo.getTypeName().equalsIgnoreCase("WIFI"))
            if (networkInfo.isConnected()){
                                     typeOfConnection = 1;
                 Toast.makeText(getApplicationContext(), "net on", Toast.LENGTH_LONG).show();

            }
        if (networkInfo.getTypeName().equalsIgnoreCase("MOBILE"))
            if (networkInfo.isConnected()){
                                     typeOfConnection = 2;
                 Toast.makeText(getApplicationContext(), "net on", Toast.LENGTH_LONG).show();

            }
    }

    TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
    if(typeOfConnection== 2 && telephonyManager.isNetworkRoaming()){
        typeOfConnection = 3;
    }

    if(typeOfConnection == 0){
                Toast.makeText(getApplicationContext(), "net OFF", Toast.LENGTH_LONG).show();

    }

All the best

Upvotes: 1

Adel Boutros
Adel Boutros

Reputation: 10295

I have done this in my application. To really check for net connection, try to ping or DNS resolve www.google.com :

  • If the ping is successful, then you have Internet connection
  • If not, you don't have Internet connection

@Waqas, that question doesn't deal with the situation of connected to router, but no Internet access because the ConnectivityManager doesn't distinguish between Network and Internet connection.

Upvotes: 1

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