CODEWITHSUNDEEP
android
prakash
prakash

Reputation: 464

how to catch internet error when its not available

hello sir in login page i am validating username and password from server database. if net is there means my application is working properly. if i disconnect internet means my application run means it show error application was not responding. how to eliminate this type of error 

    i try this code
        if(name.equals("") || pass.equals(""))
            {
                 Toast.makeText(Main.this, "Please Enter Username and Password", Toast.LENGTH_LONG).show();
            }
            else
            {

            try {
                httpclient = new DefaultHttpClient();
                httppost = new HttpPost("server url/login.php");
                // Add your data
                nameValuePairs = new ArrayList<NameValuePair>(2);
               nameValuePairs.add(new BasicNameValuePair("UserEmail", name.trim()));
                nameValuePairs.add(new BasicNameValuePair("Password", pass.trim()));
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                // Execute HTTP Post Request
                response = httpclient.execute(httppost);
                inputStream = response.getEntity().getContent();

                data = new byte[256];

                buffer = new StringBuffer();
                int len = 0;
                while (-1 != (len = inputStream.read(data)) )
                {
                    buffer.append(new String(data, 0, len));
                }

                inputStream.close();
            }

            catch (IOException e) {
                 System.out.println(e);

                 //alertDialog.cancel();

            }
            if(buffer.charAt(0)=='Y')
            {

                Intent intent=new Intent(getApplicationContext(),ManagerHandset.class);
                startActivity(intent);
            }
            else
            {
                Toast.makeText(Main.this, "Invalid Username or password", Toast.LENGTH_LONG).show();
            }
            }
        }
    });

if i want disconnect my net means how to show alert net is not available

Upvotes: 0

Views: 1531

Answers (4)

Nitesh Khosla
Nitesh Khosla

Reputation: 875

check the internet connection if net is avaible or not..

private boolean isOnline()
{
    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo netInfo = cm.getActiveNetworkInfo();
    if (netInfo != null && netInfo.isConnected()) 
    {
        return true;
    } 
    else 
    {
        return false;
    }
}

Upvotes: 0

Usama Sarwar
Usama Sarwar

Reputation: 9020

You can check your internet connection through this type of function:

public boolean isNetworkAvailable(Context context) {
    boolean value = false;

    ConnectivityManager connec = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED
            || connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED) {
        value = true;
    }

    // Log.d ("1", Boolean.toString(value) );
    return value;
}

Remember you have added following permissions in your Manifest file:

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

Edit

if (isNetworkAvailable(getApplicationContext()))
{
       // Do whatever you want to do
}
else{

         new AlertDialog.Builder(YourActivitName.this)
        .setTitle("Error")
        .setMessage("Your Internet Connection is not available at the moment. Please try again later.")
        .setPositiveButton(android.R.string.ok, null)
        .show();
 }

Hope this will work for you...

Upvotes: 1

ol_v_er
ol_v_er

Reputation: 27284

The check of the network status before stating a web call is a good habit and all the methods explained in the other responses are right. Link to the android doc.

If your application is not responding when the network is disconnected, it means you are stating your HTTP request on the main thread. You should NEVER do that.

Even if it works fine when the network is up over a Wifi connexion, you will face the same "not responding" error over a slow EDGE connection.

To make the HTTP request outside the main thread you should use an AsyncTask, the principle is explained in the android doc.

Upvotes: 0

C.d.
C.d.

Reputation: 9995

You can use something like this:

private boolean isNetworkAvailable() {
    ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetworkInfo = connectivityManager
    .getActiveNetworkInfo();
    return activeNetworkInfo != null;
}

If it returns true continue with your normal code else show a message.. also in your manifest file add

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

Upvotes: 0

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