CODEWITHSUNDEEP
androidandroid-wifi
H.S
H.S

Reputation: 159

Network connectivity checking in android

I'm trying to check network available or not.
But in my emulator it always shows connected (after disconnecting internet also)

Is there any mistake in my code.I am connecting with wifi.

Code:

public class AndroidConnectivityActivity extends Activity
{
Button checkBtn;

/** Called when the activity is first created. */
@Override

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
      checkBtn = (Button) findViewById(R.id.button1);

      checkBtn.setOnClickListener(new View.OnClickListener()
      {
       public void onClick(View v)
       {
        if(isInternetOn())
        {
         Toast.makeText(getBaseContext(), "Connected",
           Toast.LENGTH_SHORT).show();
        }
        else
        {
         Toast.makeText(getBaseContext(), "Not connected",
           Toast.LENGTH_SHORT).show();
        }
       }});
     }

     public final boolean isInternetOn()
     {
      ConnectivityManager connec = (ConnectivityManager) getSystemService
      (Context.CONNECTIVITY_SERVICE);

      if ((connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED)
        ||(connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTING)
        ||(connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTING)
        ||(connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED))
      {
       return true;
      }

      else if ((connec.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED)
        || (connec.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED))
      {
       return false;
      }

      return false;
     }
    }

Upvotes: 4

Views: 3749

Answers (3)

Vivek Kumar Srivastava
Vivek Kumar Srivastava

Reputation: 2158

use below code

public static boolean isInternetAvailable(Context context)
    {
        boolean isInternetAvailable = false;

        try
        {  
            ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

            if(networkInfo != null && (networkInfo.isConnected()))
            {
                isInternetAvailable  = true;
            }    
        }
        catch(Exception exception)
        {
            // Do Nothing
        }

        return isInternetAvailable;
    }

and also try on real device

use code in Activity onCreate Method like

if(isInternetAvailable(this))
{
Toast toast = Toast.makeText(this, "internet available", Toast.LENGTH_SHORT);
        toast.show();
}
else
{
Toast toast = Toast.makeText(this, "internet not available", Toast.LENGTH_SHORT);
        toast.show();
}

Required manifest permission

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

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

Upvotes: 2

Fabian Knapp
Fabian Knapp

Reputation: 1382

use this:

private boolean getOnlineState() {
        ConnectivityManager myConnectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo myNetworkInfo = myConnectivityManager
                .getActiveNetworkInfo();
        if (myNetworkInfo != null
                && myNetworkInfo.isConnectedOrConnecting())
            return true;
        return false;

    }

and btw:

if ((connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED)
    ||(connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTING)
    ||(connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTING)
    ||(connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED))
  {
   return true;
  }

  else if ((connec.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED)
    || (connec.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED))
  {
   return false;
  }

  return false;
 }

is the same like:

    if ((connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED)
    ||(connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTING)
    ||(connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTING)
    ||(connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED))
         return true;
         return false;

Yous should try such hardwareoperations on a real phone rather then the emulator.

Upvotes: 0

NullPointerException
NullPointerException

Reputation: 4008

Use mehod shoen below 

public static boolean isInternetAvailable(Context context) {
            ConnectivityManager cm =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo netInfo = cm.getActiveNetworkInfo();
            if (netInfo != null && netInfo.isConnectedOrConnecting()) {
                return true;
            }
            return false;
        }

and in manifest set permission as 

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

Upvotes: 2

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