LOGREG CLASS

package com.example.liquifyapp;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.ByteArrayBuffer;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Paint;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class LogReg extends Activity {
    EditText user;
    EditText pass;

    String xuser;
    String xpass;

    String flag;

    SessionManager session;

    public void ToastLoadShout(String msg){Toast.makeText(this, msg, Toast.LENGTH_LONG).show();}
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
        setContentView(R.layout.activity_log_reg);
        getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.titlebar);

        TextView register =(TextView) findViewById(R.id.register);
        register.setPaintFlags(register.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);
        register.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                Intent intent = new Intent(LogReg.this, Registration.class);
                startActivity(intent);
                finish();
            }
        });

        final CharSequence[] items = {"Account / Register", "Save Article", "Back", "Main Menu"};

        AlertDialog.Builder builder = new AlertDialog.Builder(LogReg.this);
        builder.setTitle("Liquify News");
        builder.setIcon(R.drawable.poplisticon);
        builder.setItems(items, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int item) {

        if(item==0)
        {
            Intent intent = new Intent(LogReg.this, LogReg.class);
            startActivity(intent);
        }
        if (item==1)
        {

        }
        if(item==2)
        {
            finish();
        }
        if(item==3)
        {
            Intent intent = new Intent(LogReg.this, MainActivity.class);
            startActivity(intent);
        }

            }
        });
        final AlertDialog alert = builder.create();
    ImageView menu;
    menu = (ImageView) findViewById(R.id.menu);
    menu.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            alert.show();
        }
    });

    user =(EditText) findViewById(R.id.usertext);
    pass =(EditText) findViewById(R.id.passtext);

    Button login;
    login = (Button) findViewById(R.id.loginbut);
    login.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
             xuser=user.getText().toString();
             xpass=pass.getText().toString();

            if ((!xuser.equals(""))&&(!xuser.equals(null)))
            {
                if((!xpass.equals(""))&&(!xpass.equals(null)))
                {
                    new PostAsyncTask().execute();
                }
                else
                    ToastLoadShout("Please enter a password.");
            }
            else
                ToastLoadShout("Please enter a username.");
        }
    });
    }
    public String Login()
    {
            try
            {
            HttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost("http://www.mydomain.com/login.php");
            List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>(1);
            nameValuePair.add(new BasicNameValuePair("user",xuser));
            nameValuePair.add(new BasicNameValuePair("pass",xpass));
            UrlEncodedFormEntity form;
            form = new UrlEncodedFormEntity(nameValuePair);
            form.setContentEncoding(HTTP.UTF_8);
            try {
                httpPost.setEntity((HttpEntity) new UrlEncodedFormEntity(nameValuePair,"UTF-8"));
            } catch (UnsupportedEncodingException e) {
                // writing error to Log
                e.printStackTrace();
            }
            try
            {

                HttpResponse response = httpClient.execute(httpPost);
                //HttpEntity entity = response.getEntity();

                InputStream is = response.getEntity().getContent();
                BufferedInputStream bis = new BufferedInputStream(is);
                ByteArrayBuffer baf = new ByteArrayBuffer(20);

                int current = 0;

                while((current = bis.read()) != -1){
                    baf.append((byte)current);
                }

                /* Convert the Bytes read to a String. */
                flag=(new String(baf.toByteArray()));


            }
            catch (ClientProtocolException e) {
                // writing exception to log

                e.printStackTrace();
            } catch (IOException e) {
                // writing exception to log

                e.printStackTrace();
            }

            }
        catch (Exception e) {
            // TODO: handle exception

        }
        return flag;
    }



    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_log_reg, menu);
        return true;
    }

    class PostAsyncTask extends AsyncTask<String, String, String> {
        protected void onPreExecute() {
             // show progress dialog
         }
         protected String doInBackground(String... params) {

            return Login();
         }

             protected void onPostExecute(String result) {
                 flag=result;
               if (flag.equals("1"))
               {
                   //ToastLoadShout("Login Successful.");
                   ToastLoadShout("Welcome Back, "+xuser+"!");
                   session.createLoginSession(xuser);
                   ToastLoadShout("flag: "+flag);
                   finish();
               }
               if (flag.equals("2"))
               {
                 ToastLoadShout("Wrong Username or Password.");
                 ToastLoadShout("flag: "+flag);
               }
               if(!flag.equals("1")&&!flag.equals("2"))
               {
                   ToastLoadShout("Could'nt Log you in. Try again later.");
                   ToastLoadShout("flag: "+flag);
               }

             }
         }

}