Question

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

Answer 1

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…