Logall.java

package com.zamer.zamer;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.zamer.parser.JSONParser;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;

public class Logall extends Activity {

    private static String url_proverka = "http://zamer.com.ua/api";

    private static final String TAG_SUCCESS = "success";
    private static final String TAG_PRODUCT = "product";
    private static final String TAG_PASS = "pass";
    private static final String TAG_SID = "login";
    private static final String TAG_SOLT = "solt";

    private String pass;
    private String s;
    public String sid;

    JSONParser jsonParser = new JSONParser();
    Scannpass w = new Scannpass();


    // Email, password edittext
    EditText txtUsername, txtPassword;

    // login button
    Button btnLogin;

    // Alert Dialog Manager
    AlertDialogManager alert = new AlertDialogManager();


    HashMap<String, String> datauser = new HashMap<String, String>();

    // Session Manager Class
    SessionManager session;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.reg);

        // Session Manager
        session = new SessionManager(getApplicationContext());

        // Email, Password input text
        txtUsername = (EditText) findViewById(R.id.txtUsername);
        txtPassword = (EditText) findViewById(R.id.txtPassword);


        Toast.makeText(getApplicationContext(), "User Login Status: " + session.isLoggedIn(), Toast.LENGTH_LONG).show();


        // Login button
        btnLogin = (Button) findViewById(R.id.btnLogin);


        // Login button click event
        btnLogin.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {

                // Get username, password from EditText
                String username = txtUsername.getText().toString();
                String password = txtPassword.getText().toString();


                // Check if username, password is filled
                if (username.trim().length() > 0 && password.trim().length() > 0) {
                    // For testing puspose username, password is checked with sample data
                    // username = test
                    // password = test

                    datauser = w.getUserServer(username);
                    pass = datauser.get(TAG_PASS);
                    s = datauser.get(TAG_SOLT);
                    sid = datauser.get(TAG_SID);

                    String po = null;

                    try {
                        po = md5Custom(s+"klim"+md5Custom(password));
                    } catch (Exception e) {
                        e.printStackTrace();
                    }


                    if (po.equals(pass)) {

                        // Creating user login session
                        // For testing i am stroing name, email as follow
                        // Use user real data
                        session.createLoginSession(sid, s);

                        // Staring MainActivity
                        Intent i = new Intent(getApplicationContext(), MainScreenActivity.class);
                        startActivity(i);
                        finish();

                    } else {
                        // username / password doesn't match
                        alert.showAlertDialog(Logall.this, "Пароль не верный", "Введите верный пароль с аккаунта zamer.com.ua", false);

                    }
                } else {
                    // user didn't entered username or password
                    // Show alert asking him to enter the details
                    alert.showAlertDialog(Logall.this, "Email не зарегистрирован", "Пройдите регистрацию, или введите другой email", false);
                }

            }
        });
    }




    public static String md5Custom(String st) {
        MessageDigest messageDigest = null;
        byte[] digest = new byte[0];

        try {
            messageDigest = MessageDigest.getInstance("MD5");
            messageDigest.reset();
            messageDigest.update(st.getBytes());
            digest = messageDigest.digest();
        } catch (NoSuchAlgorithmException e) {
            // тут можно обработать ошибку
            // возникает она если в передаваемый алгоритм в getInstance(,,,) не существует
            e.printStackTrace();
        }

        BigInteger bigInt = new BigInteger(1, digest);
        String md5Hex = bigInt.toString(16);

        while( md5Hex.length() < 32 ){
            md5Hex = "0" + md5Hex;
        }

        return md5Hex;
    }
}