Android: Check network and real internet connectivity

Question

Below is the piece of Android code which works fine to check if network is connected or not.

public static boolean isNetworkAvailable(Context context) 
{
            


        

Answer 1

check this code... it worked for me :)

public static void isNetworkAvailable(final Handler handler, final int timeout) {

        // ask fo message '0' (not connected) or '1' (connected) on 'handler'
        // the answer must be send before before within the 'timeout' (in milliseconds)

        new Thread() {

            private boolean responded = false;

            @Override
            public void run() {

                // set 'responded' to TRUE if is able to connect with google mobile (responds fast)

                new Thread() {

                    @Override
                    public void run() {
                        HttpGet requestForTest = new HttpGet("http://m.google.com");
                        try {
                            new DefaultHttpClient().execute(requestForTest); // can last...
                            responded = true;
                        } catch (Exception e) {}
                    }

                }.start();

                try {
                    int waited = 0;
                    while(!responded && (waited < timeout)) {
                        sleep(100);
                        if(!responded ) { 
                            waited += 100;
                        }
                    }
                } 
                catch(InterruptedException e) {} // do nothing 
                finally { 
                    if (!responded) { handler.sendEmptyMessage(0); } 
                    else { handler.sendEmptyMessage(1); }
                }

            }

        }.start();

}

Then, I define the handler:

Handler h = new Handler() {

    @Override
    public void handleMessage(Message msg) {

        if (msg.what != 1) { // code if not connected

        } else { // code if connected

        }

    }
};

and launch the test:

isNetworkAvailable(h,2000); // get the answser within 2000 ms

Code from Gilbou https://stackoverflow.com/a/5803489/2603719

I hope i can Help you

Answer 2

Issue #1:
Android device connected to a Wi-Fi, which turns out to be a private network.
So isNetworkAvailable will return that network is connected, but could not be connected to any other service.

Issue #2:
Sometimes the phone signal shows it is connected to service provider data plan. so network connectivity is true , but still cannot access google/yahoo.

I'm not sure about Issue #1 but I'm sure that following approach will solve Issue #2.

Ultimately, you will need to Monitor the change in Network connection,

Step 1:

Just register a BroadcastReceiver for following action

<action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>

Step 2:

when you get callback on onReceive(Context context,Intent intent) method ,check for connectivity status.

i.e: boolean isConnected = getIntent().getExtras().getBoolean(ConnectivityManager.EXTRA_NO_CONNECTIVITY);

//apart from EXTRA_NO_CONNECTIVITY, there are other parameters also which will be useful to monitor

Reference:

Examples:

Working Example of Step1,Step2: how-to-monitor-network-connectivity-in-android

Android-getting-notified-of-connectivity-changes

Github: Example for network-detect-notify

Android Docs:

Connectivity Monitoring

Connectivity Manager

I hope it will be helpful !!

Answer 3

Use This code to check internet connection, it check all the internet connection over device. And Make Sure you have added Internet Permission in menifest.

        boolean flag=false;
        ConnectivityManager connectivity = (ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivity != null)
        {
            NetworkInfo[] info = connectivity.getAllNetworkInfo();
            if (info != null)
                for (int i = 0; i < info.length; i++)
                    if (info[i].getState() == NetworkInfo.State.CONNECTED)
                    {
                        flag=true;

                    }

        }
        if(flag==true)
        {
             Log.e("TAG","Internet Is Connected");
        }
        else
        {
              Log.e("TAG","Internet Is Not Connected");
        }