Android Open Source - GroupSmart-Android Login

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License

The source code is released under:
Copyright (C) <2014> <Derek Argueta - Hunter Kehoe> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), ...
If you think the Android project GroupSmart-Android listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package com.dargueta.groupsmart;
// ww w. jav  a  2  s .c  o  m
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnKeyListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.google.analytics.tracking.android.EasyTracker;

/**
 * 
 * @author Hunter Kehoe
 * 
 * Provides the Activity for the user to log in.
 *
 */
public class Login extends Activity {
  
  Button btnNewUser, btnLogin;
  EditText etUsername, etPassword;
  
  String userLoginURL = "";
  
  ProgressDialog pDialog;
  
  public void onCreate(Bundle savedInstanceState) {
    
    super.onCreate(savedInstanceState);
    setContentView(R.layout.login);
    
    etUsername = (EditText) findViewById(R.id.etUsername);
    etPassword = (EditText) findViewById(R.id.etPassword);
    
    btnNewUser = (Button) findViewById(R.id.btnNewUser);
    btnLogin = (Button) findViewById(R.id.btnLogin);
    
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
    String username = prefs.getString(Constants.EMAIL_KEY, Constants.EMPTY_STRING);
    String password = prefs.getString(Constants.PASSWORD_KEY, Constants.EMPTY_STRING);
    
    if (username.length() != 0 && password.length() != 0) {
      
      userLoginURL = Constants.BASE_URL + "mode=usi&e=" + username + "&p=" + password;
      new UserUpdate().execute();
    }
    
    etPassword.setOnKeyListener(new OnKeyListener() {
      
        public boolean onKey(View v, int keyCode, KeyEvent event) {
          
            if(keyCode == KeyEvent.KEYCODE_ENTER && event.getAction() == KeyEvent.ACTION_UP) {
              
                btnLogin.performClick();
                return true;
            }
            
            return false;
        }
    });
    
    btnNewUser.setOnClickListener(new OnClickListener() {
      
      public void onClick(View v) {
        
        Intent i = new Intent(getApplicationContext(), Register.class);
        
        String username = etUsername.getText().toString();
        String password = etPassword.getText().toString();
        
        i.putExtra(Constants.USERNAME_KEY, username);
        i.putExtra(Constants.PASSWORD_KEY, password);
        startActivity(i);
      }
    });
    
    btnLogin.setOnClickListener(new OnClickListener() {
      
      public void onClick(View v) {
        
        String username = etUsername.getText().toString();
        String password = etPassword.getText().toString();
        
        if (username.length() == 0 || password.length() == 0) {
          
          Toast.makeText(getApplicationContext(),
                   "Please enter username/password",
                   Toast.LENGTH_SHORT).show();
          return;
          
        } else {
          
          if (username.indexOf(' ') != -1 || password.indexOf(' ') != -1) {
            
            Toast.makeText(getApplicationContext(),
                     "No spaces allowed in username/password",
                     Toast.LENGTH_SHORT).show();
            return;
            
          } else if (username.indexOf("@") == -1) {
            
            Toast.makeText(getApplicationContext(),
                     "Email needs an @ symbol",
                     Toast.LENGTH_SHORT).show();
            return;
            
          } else {
          
            userLoginURL = Constants.BASE_URL + "mode=usi&e=" + username + "&p=" + password;
          }
        }
        
        new UserLogin().execute();
      }
    });
  }
  
  /**
   * 
   * @author Hunter Kehoe
   * 
   * Asynchronously log the user in on the remote server.
   *
   */
  private class UserLogin extends AsyncTask<Void, Void, Void> {  
    
    boolean successful = false;
    
    protected void onPreExecute() {
      
      super.onPreExecute();
      pDialog = new ProgressDialog(Login.this);
      pDialog.setMessage(getString(R.string.pleaseWait));
      pDialog.setCancelable(false);
      pDialog.show();
    }
    
    protected Void doInBackground(Void... arg0) {
      
      ServiceHandler sh = new ServiceHandler();
      String jsonStr = sh.makeServiceCall(userLoginURL, ServiceHandler.GET);
      
      if (!jsonStr.equals("LOGIN FAILED")) {        
        
        successful = true;
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
        SharedPreferences.Editor editor = prefs.edit();
        int id=0, privacy=0, adminMessage=0, active=0;
        String password="",
             firstName="",
             lastName="",
             email="",
             major="",
             groups="",
             course1="",
             course2="",
             course3="",
             course4="",
             course5="",
             course6="";
        
        try {
          
          JSONObject user = new JSONObject(jsonStr);
          
          id = user.getInt(Constants.ID_KEY);
          password = etPassword.getText().toString();
          firstName = user.getString(Constants.FIRST_NAME_KEY);
          lastName = user.getString(Constants.LAST_NAME_KEY);
          email = user.getString(Constants.EMAIL_KEY);
          major = user.getString(Constants.MAJOR_KEY);
          groups = user.getString(Constants.GROUPS_KEY);
          course1 = user.getString(Constants.COURSE_ONE_KEY);
          course2 = user.getString(Constants.COURSE_TWO_KEY);
          course3 = user.getString(Constants.COURSE_THREE_KEY);
          course4 = user.getString(Constants.COURSE_FOUR_KEY);
          course5 = user.getString(Constants.COURSE_FIVE_KEY);
          course6 = user.getString(Constants.COURSE_SIX_KEY);
          privacy = user.getInt(Constants.PRIVACY_KEY);
          adminMessage = user.getInt(Constants.ADMIN_MESSAGE_KEY);
          active = user.getInt(Constants.ACTIVE_KEY);
          
        } catch (JSONException e) {
          
          e.printStackTrace();
        }
        
        editor.putInt(Constants.ID_KEY, id);
        editor.putString(Constants.PASSWORD_KEY, password);
        editor.putString(Constants.FIRST_NAME_KEY, firstName);
        editor.putString(Constants.LAST_NAME_KEY, lastName);
        editor.putString(Constants.EMAIL_KEY, email);
        editor.putString(Constants.MAJOR_KEY, major);
        editor.putString(Constants.GROUPS_KEY, groups);
        editor.putString(Constants.COURSE_ONE_KEY, course1);
        editor.putString(Constants.COURSE_TWO_KEY, course2);
        editor.putString(Constants.COURSE_THREE_KEY, course3);
        editor.putString(Constants.COURSE_FOUR_KEY, course4);
        editor.putString(Constants.COURSE_FIVE_KEY, course5);
        editor.putString(Constants.COURSE_SIX_KEY, course6);
        editor.putInt(Constants.PRIVACY_KEY, privacy);
        editor.putInt(Constants.ADMIN_MESSAGE_KEY, adminMessage);
        editor.putInt(Constants.ACTIVE_KEY, active);
        
        editor.commit();
      }
          
      return null;
    }
    
    protected void onPostExecute(Void result) {
      
      super.onPostExecute(result);
      
      if(pDialog.isShowing()) {
        
        pDialog.dismiss();
      }
      
      if (successful) {
        
        Intent i = new Intent(getApplicationContext(), Main.class);
        i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(i);
        finish();
        
      } else {
        
        Toast.makeText(getApplicationContext(),
                 "Invalid email/password combination",
                 Toast.LENGTH_SHORT).show();
      }
    }
  }
  
  private class UserUpdate extends AsyncTask<Void, Void, Void> {  
    
    boolean successful = false;
    
    protected void onPreExecute() {
      
      super.onPreExecute();
      pDialog = new ProgressDialog(Login.this);
      pDialog.setMessage(getString(R.string.pleaseWait));
      pDialog.setCancelable(false);
      pDialog.show();
    }
    
    protected Void doInBackground(Void... arg0) {
      
      ServiceHandler sh = new ServiceHandler();
      String jsonStr = sh.makeServiceCall(userLoginURL, ServiceHandler.GET);
      if (!jsonStr.equals("LOGIN FAILED")) {        
        successful = true;
      }
          
      return null;
    }
    
    protected void onPostExecute(Void result) {
      
      super.onPostExecute(result);
      
      if(pDialog.isShowing()) {
        
        pDialog.dismiss();
      }
      
      if (successful) {
        
        Intent i = new Intent(getApplicationContext(), Main.class);
        startActivity(i);
        finish();
        
      } else {
        
        Toast.makeText(getApplicationContext(),
                 "Password changed. Login again",
                 Toast.LENGTH_SHORT).show();
        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
        
        if(prefs.getString(Constants.EMAIL_KEY, Constants.EMPTY_STRING).length() != 0) {
        
          etUsername.setText(prefs.getString(Constants.EMAIL_KEY,
                             Constants.EMPTY_STRING));
        }
      }
    }
  }

  
  public void onStart() {
    
    super.onStart();
    EasyTracker.getInstance(this).activityStart(this);
  }
  
  
  public void onStop() {
    
    super.onStop();
    EasyTracker.getInstance(this).activityStop(this);
  }
}
Java Source Code List
