NetworkConnection on Main Thread and Validation

I am warned not to use network operations on main thread.

But i have such a case;

I need to check the value whether it is exist on the database or not,

if yes i will proceed to another activity.

But i am taking an exception. Pls help me to solve this My updated code

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.initial);




    if(!isNetworkAvailable())
    {
        final Dialog dialog = new Dialog(context);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog.setContentView(R.layout.customlayoutnetconnection);

        Button dialogButton = (Button) dialog.findViewById(R.id.Ok);
        Button dialogButton2 = (Button) dialog.findViewById(R.id.OpenCon);


        dialogButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {

                dialog.dismiss();
                finish();
            }});

        dialogButton2.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {


                ConnectivityManager manager = (ConnectivityManager)getSystemService(InitialActivity.CONNECTIVITY_SERVICE);


                Boolean is3g = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).isConnectedOrConnecting();


                Boolean isWifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();

                if(is3g){
                    Toast.makeText(context, "3G", Toast.LENGTH_LONG);
                }else if(isWifi){
                    Toast.makeText(context, "wifi", Toast.LENGTH_LONG);
                }else{
                    Toast.makeText(context, "nothing", Toast.LENGTH_LONG);

                    startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS));
                }

            }});
        dialog.show();
    }


    lost = (Button) findViewById(R.id.imlost);
    lost.setOnClickListener(this);

    looking = (Button) findViewById(R.id.imlookingfor);
    looking.setOnClickListener(this);

    about = (Button) findViewById(R.id.about);
    about.setOnClickListener(this);

    howto = (Button) findViewById(R.id.howto);
    howto.setOnClickListener(this);



}




@Override
public void onClick(View v) {


    if(v==lost)
    {

        Intent i = new Intent(getApplicationContext(),IamLostActivity.class);


        startActivity(i);
    }

    else if(v==looking)
    {
        final Dialog dialog = new Dialog(context);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog.setContentView(R.layout.customlayout);

        Button dialogButton = (Button) dialog.findViewById(R.id.Find);

        code  = (EditText) dialog.findViewById(R.id.codeToFind);

        code.requestFocus();

        dialogButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {


                if(code.getText().toString().contentEquals(""))
                {

                    final Dialog dialog2 = new Dialog(context);
                    dialog2.requestWindowFeature(Window.FEATURE_NO_TITLE);
                    dialog2.setContentView(R.layout.customlayoutinfo);

                    TextView tv = (TextView) dialog2.findViewById(R.id.customInfo);

                    tv.setText(context.getString(R.string.BlankField));

                    Button dialogButton2 = (Button) dialog2.findViewById(R.id.Ok);

                    dialogButton2.setOnClickListener(new OnClickListener() {
                        @Override
                        public void onClick(View v) {

                            dialog2.dismiss();

                            } }); 
                        dialog2.show();
                }


                else 
                {

                    findFriend = new Runnable() {
                        @Override
                        public void run() {

                            httpclnt = new DefaultHttpClient();

                            httppst = new HttpPost(url);

                            try {   

                                nameValuePairs = new ArrayList<NameValuePair>(1);
                                nameValuePairs.add((new BasicNameValuePair("code", code.getText().toString())));

                                httppst.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                                ResponseHandler<String> responseHandler = new BasicResponseHandler();

                                response = httpclnt.execute(httppst, responseHandler);

                                //message = response;
                            }
                            catch (ClientProtocolException e) {
                                Toast.makeText(InitialActivity.this, "Client protocol exception ", Toast.LENGTH_LONG).show();
                            } catch (IOException e) {
                                Toast.makeText(InitialActivity.this, "IO exception "+e.getMessage(), Toast.LENGTH_LONG).show();
                            }
                       }

                    };

                    Thread thread = new Thread(null, findFriend, "FindFriend");
                    thread.start();

                                if(response.contentEquals(","))
                                {


                                    final Dialog dialog4 = new Dialog(context);
                                    dialog4.requestWindowFeature(Window.FEATURE_NO_TITLE);
                                    dialog4.setContentView(R.layout.customlayoutinfo);

                                    TextView tv = (TextView) dialog4.findViewById(R.id.customInfo);

                                    tv.setText(context.getString(R.string.CheckCorrectness));

                                    Button dialogButton2 = (Button) dialog4.findViewById(R.id.Ok);

                                    dialogButton2.setOnClickListener(new OnClickListener() {
                                        @Override
                                        public void onClick(View v) {

                                            dialog4.dismiss();

                                            } }); 
                                        dialog4.show();
                                }
                                else
                                {
                                    Intent in = new Intent(getApplicationContext(),IamLookingForActivity.class);

                                    in.putExtra("message", response.toString());

                                    startActivity(in);
                                }

                    };

}

            }
        );



        Button dialogButton2 = (Button) dialog.findViewById(R.id.Cancel);
        dialogButton2.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog.dismiss();
            }
        });
        dialog.show();
      }

    else if(v==about)
    {
         final Dialog dialog = new Dialog(context);
            dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
            dialog.setContentView(R.layout.customlayoutabout);

            ImageButton dialogButton = (ImageButton) dialog.findViewById(R.id.kodatolye);

            Button dialogButton2 = (Button) dialog.findViewById(R.id.Back);

            dialogButton.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {

                    final Dialog dialog2 = new Dialog(context);
                    dialog2.requestWindowFeature(Window.FEATURE_NO_TITLE);
                    dialog2.setContentView(R.layout.customlayoutinfo);

                    TextView tv = (TextView) dialog2.findViewById(R.id.customInfo);

                    tv.setText("www.kodatolye.com");
                    Button dialogButton3 = (Button) dialog2.findViewById(R.id.Ok);


                    dialogButton3.setOnClickListener(new OnClickListener() {
                        @Override
                        public void onClick(View v) {

                            dialog2.dismiss();


                            } }); 
                    dialog2.show();

                    } }); 

            dialogButton2.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {

                    dialog.dismiss();

                    } }); 
                dialog.show();

    }
    else if(v==howto)
    {


        final Dialog dialog2 = new Dialog(context);
        dialog2.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog2.setContentView(R.layout.customlayouthowto);


        Button dialogButton3 = (Button) dialog2.findViewById(R.id.Back);



        dialogButton3.setOnClickListener(new OnClickListener() {
            @Override
        public void onClick(View v) {

                dialog2.dismiss();

            } }); 
        dialog2.show();

    }
}



}

Answers


You must not execute networking code on the main thread. Likewise, you must not try to update the UI from anything other than the main thread. You are (correctly) starting a separate thread for the networking operation, but you aren't waiting for it to finish. You should move the code that starts if(response.contentEquals(...)) into a Runnable that is not run until the networking activity is complete and you have a response. You can then post the Runnable to the main thread through a Handler to start the new activity (or display an error message, as appropriate). You might want to display a dialog telling the user to wait before starting the networking thread.

An AsyncTask does most of this bookkeeping work for you, making it all a bit easier. See the blog post Painless Threading for more info.


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