Android Open Source - PromenadeAndroid Login Activity

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License

The source code is released under:

This is free and unencumbered software released into the public domain. Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a co...

Java Source Code

package com.promenadevt;
 //from w  w w  .ja v a 2  s  .  c om
import java.util.HashMap;
 
import org.json.JSONException;
import org.json.JSONObject;
 
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
 
import com.promenadevt.android.R;
import com.promenadevt.library.DatabaseHandler;
import com.promenadevt.library.UserFunctions;
 
public class LoginActivity extends Activity {
    Button btnLogin;
    Button btnLinkToRegister;
    EditText inputUser;
    EditText inputPassword;
    TextView loginErrorMsg;
 
    // JSON Response node names
    private static String KEY_SUCCESS = "success";
    private static String KEY_ERROR = "error";
    private static String KEY_ERROR_MSG = "error_msg";
    private static String KEY_PASS = "pass";
    private static String KEY_NAME = "name";
    private static String KEY_EMAIL = "email";
    //private static String KEY_CREATED_AT = "created_at";
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);
        
        DatabaseHandler db = new DatabaseHandler(getApplicationContext());
        if(db.getRowCount() > 0){
          Intent homes = new Intent(getApplicationContext(), HomesActivity.class);
          HashMap<String, String> loginInfo = db.getUserDetails();
          homes.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            homes.putExtra("name",loginInfo.get("username"));
            startActivity(homes);
            finish();
        }
        
 
        // Importing all assets like buttons, text fields
        inputUser = (EditText) findViewById(R.id.loginUser);
        inputPassword = (EditText) findViewById(R.id.loginPassword);
        btnLogin = (Button) findViewById(R.id.btnLogin);
        btnLinkToRegister = (Button) findViewById(R.id.btnLinkToRegisterScreen);
        loginErrorMsg = (TextView) findViewById(R.id.login_error);
 
        // Login button Click Event
        btnLogin.setOnClickListener(new View.OnClickListener() {
 
            public void onClick(View view) {
                String username = inputUser.getText().toString();
                String password = inputPassword.getText().toString();
                UserFunctions userFunction = new UserFunctions();
                JSONObject json = userFunction.loginUser(username, password);
 
                // check for login response
                try {
                    if (json.getString(KEY_SUCCESS) != null) {
                        loginErrorMsg.setText("User Found");
                        String res = json.getString(KEY_SUCCESS); 
                        if(Integer.parseInt(res) == 1){
                            // user successfully logged in
                            // Store user details in SQLite Database
                            DatabaseHandler db = new DatabaseHandler(getApplicationContext());
                            JSONObject json_user = json.getJSONObject("username");
                             
                            // Clear all previous data in database
                            userFunction.logoutUser(getApplicationContext());
                            db.addUser(json_user.getString(KEY_NAME), password, json_user.getString(KEY_EMAIL));                        
                             
                            // Launch homes Screen
                            Intent homes = new Intent(getApplicationContext(), HomesActivity.class);
                             
                            // Close all views before launching Dashboard
                            homes.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                            homes.putExtra("name",username);
                            startActivity(homes);
                             
                            // Close Login Screen
                            finish();
                        }else{
                            // Error in login
                            loginErrorMsg.setText("Incorrect username/password");
                        }
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        });
 
        // Link to Register Screen
        btnLinkToRegister.setOnClickListener(new View.OnClickListener() {
 
            public void onClick(View view) {
                Intent i = new Intent(getApplicationContext(),
                        RegisterActivity.class);
                startActivity(i);
                finish();
            }
        });
    }
}

Java Source Code List

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