[android-developers] Problem in Login

[tazeem baig]

MainActivity.java:


package com.example.mirzatazeembaig.mynetwork;

import android.content.Intent;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.telephony.SmsManager;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    EditText Username,Password;
    Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Username=(EditText)findViewById(R.id.editText);
        Password=(EditText)findViewById(R.id.editText2);
        btn=(Button)findViewById(R.id.button);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) 
findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", 
Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }
    public void onLogin(View view){
        String username=Username.getText().toString();
        String password=Password.getText().toString();
        String type="login";
        BackgroundWorker backgroundWorker=new BackgroundWorker(this);
        backgroundWorker.execute(type,username,password);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


}


BackgroundWorjer.java:


import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;

public class BackgroundWorker extends AsyncTask<String,Void,String> {
    Context context;
    AlertDialog alertDialog;
    BackgroundWorker(Context ctx){
        context=ctx;
    }
    @Override
    protected String doInBackground(String... params) {
        String type=params[0];
        String Login_url="http://localhost/htdocs/login.php";;
        if(type.equals("login.php")){
            try {
                String user_name=params[1];
                String password=params[2];
                URL url=new URL(Login_url);
                HttpURLConnection 
httpurlconnection=(HttpURLConnection)url.openConnection();
                httpurlconnection.setRequestMethod("POST");
                httpurlconnection.setDoInput(true);
                httpurlconnection.setDoOutput(true);
                OutputStream outputStream=httpurlconnection.getOutputStream();
                BufferedWriter bufferedWriter=new BufferedWriter(new 
OutputStreamWriter(outputStream,"UTF-8"));
                String post_data= 
URLEncoder.encode("user_name","UTF-8")+"="+URLEncoder.encode("user_name","UTF-8")+"&"
                                          
+URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode("password","UTF-8");
                bufferedWriter.write(post_data);
                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();
                InputStream inputStream=httpurlconnection.getInputStream();
                BufferedReader bufferedReader=new BufferedReader(new 
InputStreamReader(inputStream,"iso-8859-1"));
                String result="";
                String line="";
                while ((line=bufferedReader.readLine())!=null){
                    result+=line;
                }
                bufferedReader.close();
                inputStream.close();
                httpurlconnection.disconnect();
                return result;




            }
            catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    @Override
    protected void onPreExecute() {

        alertDialog=new AlertDialog.Builder(context).create();
        alertDialog.setTitle("Login State");
    }


    @Override
    protected void onPostExecute(String result) {
        alertDialog.setMessage(result);
        alertDialog.show();
    }

    @Override
    protected void onProgressUpdate(Void... values) {
        super.onProgressUpdate(values);
    }
}

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