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Android Login and Registration Application Using Php and mysql

  Android Login and  Registration Application Using Php and mysql

Login Activity.java

package loginandregistration;



import info.androidhive.loginandregistration.R;



import java.util.HashMap;

import java.util.Map;



import loginandregistration.app.AppConfig;

import loginandregistration.app.AppController;

import loginandregistration.helper.SessionManager;



import org.json.JSONException;

import org.json.JSONObject;



import android.app.Activity;

import android.app.ProgressDialog;

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.Toast;



import com.android.volley.Request.Method;

import com.android.volley.Response;

import com.android.volley.VolleyError;

import com.android.volley.toolbox.StringRequest;



public class LoginActivity extends Activity {

    // LogCat tag

    private static final String TAG = RegisterActivity.class.getSimpleName();

    private Button btnLogin;

    private Button btnLinkToRegister;

    private EditText inputEmail;

    private EditText inputPassword;

    private ProgressDialog pDialog;

    private SessionManager session;



    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_login);



        inputEmail = (EditText) findViewById(R.id.email);

        inputPassword = (EditText) findViewById(R.id.password);

        btnLogin = (Button) findViewById(R.id.btnLogin);

        btnLinkToRegister = (Button) findViewById(R.id.btnLinkToRegisterScreen);



        // Progress dialog

        pDialog = new ProgressDialog(this);

        pDialog.setCancelable(false);



        // Session manager

        session = new SessionManager(getApplicationContext());



        // Check if user is already logged in or not

        if (session.isLoggedIn()) {

            // User is already logged in. Take him to main activity

            Intent intent = new Intent(LoginActivity.this, MainActivity.class);

            startActivity(intent);

            finish();

        }



        // Login button Click Event

        btnLogin.setOnClickListener(new View.OnClickListener() {



            public void onClick(View view) {

                String email = inputEmail.getText().toString();

                String password = inputPassword.getText().toString();



                // Check for empty data in the form

                if (email.trim().length() > 0 && password.trim().length() > 0) {

                    // login user

                    checkLogin(email, password);

                } else {

                    // Prompt user to enter credentials

                    Toast.makeText(getApplicationContext(),

                            "Please enter the credentials!", Toast.LENGTH_LONG)

                            .show();

                }

            }



        });



        // Link to Register Screen

        btnLinkToRegister.setOnClickListener(new View.OnClickListener() {



            public void onClick(View view) {

                Intent i = new Intent(getApplicationContext(),

                        RegisterActivity.class);

                startActivity(i);

                finish();

            }

        });



    }



    /**

     * function to verify login details in mysql db

     * */

    private void checkLogin(final String email, final String password) {

        // Tag used to cancel the request

        String tag_string_req = "req_login";



        pDialog.setMessage("Logging in ...");

        showDialog();



        StringRequest strReq = new StringRequest(Method.POST,

                AppConfig.URL_REGISTER, new Response.Listener<String>() {



                    @Override

                    public void onResponse(String response) {

                        Log.d(TAG, "Login Response: " + response.toString());

                        hideDialog();



                        try {

                            JSONObject jObj = new JSONObject(response);

                            boolean error = jObj.getBoolean("error");



                            // Check for error node in json

                            if (!error) {

                                // user successfully logged in

                                // Create login session

                                session.setLogin(true);



                                // Launch main activity

                                Intent intent = new Intent(LoginActivity.this,

                                        MainActivity.class);

                                startActivity(intent);

                                finish();

                            } else {

                                // Error in login. Get the error message

                                String errorMsg = jObj.getString("error_msg");

                                Toast.makeText(getApplicationContext(),

                                        errorMsg, Toast.LENGTH_LONG).show();

                            }

                        } catch (JSONException e) {

                            // JSON error

                            e.printStackTrace();

                        }



                    }

                }, new Response.ErrorListener() {



                    @Override

                    public void onErrorResponse(VolleyError error) {

                        Log.e(TAG, "Login Error: " + error.getMessage());

                        Toast.makeText(getApplicationContext(),

                                error.getMessage(), Toast.LENGTH_LONG).show();

                        hideDialog();

                    }

                }) {



            @Override

            protected Map<String, String> getParams() {

                // Posting parameters to login url

                Map<String, String> params = new HashMap<String, String>();

                params.put("tag", "login");

                params.put("email", email);

                params.put("password", password);



                return params;

            }



        };



        // Adding request to request queue

        AppController.getInstance().addToRequestQueue(strReq, tag_string_req);

    }



    private void showDialog() {

        if (!pDialog.isShowing())

            pDialog.show();

    }



    private void hideDialog() {

        if (pDialog.isShowing())

            pDialog.dismiss();

    }

}

MainActivity.java

                                            Download : Code

package loginandregistration;

import info.androidhive.loginandregistration.R;

import java.util.HashMap;

import loginandregistration.helper.SQLiteHandler;
import loginandregistration.helper.SessionManager;

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

public class MainActivity extends Activity {

    private TextView txtName;
    private TextView txtEmail;
    private Button btnLogout;

    private SQLiteHandler db;
    private SessionManager session;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        txtName = (TextView) findViewById(R.id.name);
        txtEmail = (TextView) findViewById(R.id.email);
        btnLogout = (Button) findViewById(R.id.btnLogout);

        // SqLite database handler
        db = new SQLiteHandler(getApplicationContext());

        // session manager
        session = new SessionManager(getApplicationContext());

        if (!session.isLoggedIn()) {
            logoutUser();
        }

        // Fetching user details from sqlite
        HashMap<String, String> user = db.getUserDetails();

        String name = user.get("name");
        String email = user.get("email");

        // Displaying the user details on the screen
        txtName.setText(name);
        txtEmail.setText(email);

        // Logout button click event
        btnLogout.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                logoutUser();
            }
        });
    }

    /**
     * Logging out the user. Will set isLoggedIn flag to false in shared
     * preferences Clears the user data from sqlite users table
     * */
    private void logoutUser() {
        session.setLogin(false);

        db.deleteUsers();

        // Launching the login activity
        Intent intent = new Intent(MainActivity.this, LoginActivity.class);
        startActivity(intent);
        finish();
    }
}

RegisterActivity.java

package loginandregistration;

import info.androidhive.loginandregistration.R;

import java.util.HashMap;
import java.util.Map;

import loginandregistration.app.AppConfig;
import loginandregistration.app.AppController;
import loginandregistration.helper.SQLiteHandler;
import loginandregistration.helper.SessionManager;

import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
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.Toast;

import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;

public class RegisterActivity extends Activity {
    private static final String TAG = RegisterActivity.class.getSimpleName();
    private Button btnRegister;
    private Button btnLinkToLogin;
    private EditText inputFullName;
    private EditText inputEmail;
    private EditText inputPassword;
    private ProgressDialog pDialog;
    private SessionManager session;
    private SQLiteHandler db;

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

        inputFullName = (EditText) findViewById(R.id.name);
        inputEmail = (EditText) findViewById(R.id.email);
        inputPassword = (EditText) findViewById(R.id.password);
        btnRegister = (Button) findViewById(R.id.btnRegister);
        btnLinkToLogin = (Button) findViewById(R.id.btnLinkToLoginScreen);

        // Progress dialog
        pDialog = new ProgressDialog(this);
        pDialog.setCancelable(false);

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

        // SQLite database handler
        db = new SQLiteHandler(getApplicationContext());

        // Check if user is already logged in or not
        if (session.isLoggedIn()) {
            // User is already logged in. Take him to main activity
            Intent intent = new Intent(RegisterActivity.this,
                    MainActivity.class);
            startActivity(intent);
            finish();
        }

        // Register Button Click event
        btnRegister.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                String name = inputFullName.getText().toString();
                String email = inputEmail.getText().toString();
                String password = inputPassword.getText().toString();

                if (!name.isEmpty() && !email.isEmpty() && !password.isEmpty()) {
                    registerUser(name, email, password);
                } else {
                    Toast.makeText(getApplicationContext(),
                            "Please enter your details!", Toast.LENGTH_LONG)
                            .show();
                }
            }
        });

        // Link to Login Screen
        btnLinkToLogin.setOnClickListener(new View.OnClickListener() {

            public void onClick(View view) {
                Intent i = new Intent(getApplicationContext(),
                        LoginActivity.class);
                startActivity(i);
                finish();
            }
        });

    }

    /**
     * Function to store user in MySQL database will post params(tag, name,
     * email, password) to register url
     * */
    private void registerUser(final String name, final String email,
            final String password) {
        // Tag used to cancel the request
        String tag_string_req = "req_register";

        pDialog.setMessage("Registering ...");
        showDialog();

        StringRequest strReq = new StringRequest(Method.POST,
                AppConfig.URL_REGISTER, new Response.Listener<String>() {

                    @Override
                    public void onResponse(String response) {
                        Log.d(TAG, "Register Response: " + response.toString());
                        hideDialog();

                        try {
                            JSONObject jObj = new JSONObject(response);
                            boolean error = jObj.getBoolean("error");
                            if (!error) {
                                // User successfully stored in MySQL
                                // Now store the user in sqlite
                                String uid = jObj.getString("uid");

                                JSONObject user = jObj.getJSONObject("user");
                                String name = user.getString("name");
                                String email = user.getString("email");
                                String created_at = user
                                        .getString("created_at");

                                // Inserting row in users table
                                db.addUser(name, email, uid, created_at);

                                // Launch login activity
                                Intent intent = new Intent(
                                        RegisterActivity.this,
                                        LoginActivity.class);
                                startActivity(intent);
                                finish();
                            } else {

                                // Error occurred in registration. Get the error
                                // message
                                String errorMsg = jObj.getString("error_msg");
                                Toast.makeText(getApplicationContext(),
                                        errorMsg, Toast.LENGTH_LONG).show();
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                    }
                }, new Response.ErrorListener() {

                    @Override
                    public void onErrorResponse(VolleyError error) {
                        Log.e(TAG, "Registration Error: " + error.getMessage());
                        Toast.makeText(getApplicationContext(),
                                error.getMessage(), Toast.LENGTH_LONG).show();
                        hideDialog();
                    }
                }) {

            @Override
            protected Map<String, String> getParams() {
                // Posting params to register url
                Map<String, String> params = new HashMap<String, String>();
                params.put("tag", "register");
                params.put("name", name);
                params.put("email", email);
                params.put("password", password);

                return params;
            }

        };

        // Adding request to request queue
        AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
    }

    private void showDialog() {
        if (!pDialog.isShowing())
            pDialog.show();
    }

    private void hideDialog() {
        if (pDialog.isShowing())
            pDialog.dismiss();
    }
}

AppConfig.java

package loginandregistration.app;

public class AppConfig {
    // Server user login url
    public static String URL_LOGIN = "http://192.168.105.200/android_login_api/";

    // Server user register url
    public static String URL_REGISTER = "http://192.168.105.200/android_login_api/";
}

 AppController.java

package loginandregistration.app;

import android.app.Application;
import android.text.TextUtils;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;

public class AppController extends Application {

    public static final String TAG = AppController.class.getSimpleName();

    private RequestQueue mRequestQueue;

    private static AppController mInstance;

    @Override
    public void onCreate() {
        super.onCreate();
        mInstance = this;
    }

    public static synchronized AppController getInstance() {
        return mInstance;
    }

    public RequestQueue getRequestQueue() {
        if (mRequestQueue == null) {
            mRequestQueue = Volley.newRequestQueue(getApplicationContext());
        }

        return mRequestQueue;
    }

    public <T> void addToRequestQueue(Request<T> req, String tag) {
        req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
        getRequestQueue().add(req);
    }

    public <T> void addToRequestQueue(Request<T> req) {
        req.setTag(TAG);
        getRequestQueue().add(req);
    }

    public void cancelPendingRequests(Object tag) {
        if (mRequestQueue != null) {
            mRequestQueue.cancelAll(tag);
        }
    }
}

SessionManager.java

package loginandregistration.helper;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.util.Log;

public class SessionManager {
    // LogCat tag
    private static String TAG = SessionManager.class.getSimpleName();

    // Shared Preferences
    SharedPreferences pref;

    Editor editor;
    Context _context;

    // Shared pref mode
    int PRIVATE_MODE = 0;

    // Shared preferences file name
    private static final String PREF_NAME = "AndroidHiveLogin";
    
    private static final String KEY_IS_LOGGEDIN = "isLoggedIn";

    public SessionManager(Context context) {
        this._context = context;
        pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
        editor = pref.edit();
    }

    public void setLogin(boolean isLoggedIn) {

        editor.putBoolean(KEY_IS_LOGGEDIN, isLoggedIn);

        // commit changes
        editor.commit();

        Log.d(TAG, "User login session modified!");
    }
    
    public boolean isLoggedIn(){
        return pref.getBoolean(KEY_IS_LOGGEDIN, false);
    }
}

SQLiteHandler.java

package loginandregistration.helper;

import java.util.HashMap;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class SQLiteHandler extends SQLiteOpenHelper {

    private static final String TAG = SQLiteHandler.class.getSimpleName();

    // All Static variables
    // Database Version
    private static final int DATABASE_VERSION = 1;

    // Database Name
    private static final String DATABASE_NAME = "android_api";

    // Login table name
    private static final String TABLE_LOGIN = "login";

    // Login Table Columns names
    private static final String KEY_ID = "id";
    private static final String KEY_NAME = "name";
    private static final String KEY_EMAIL = "email";
    private static final String KEY_UID = "uid";
    private static final String KEY_CREATED_AT = "created_at";

    public SQLiteHandler(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    // Creating Tables
    @Override
    public void onCreate(SQLiteDatabase db) {
        String CREATE_LOGIN_TABLE = "CREATE TABLE " + TABLE_LOGIN + "("
                + KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
                + KEY_EMAIL + " TEXT UNIQUE," + KEY_UID + " TEXT,"
                + KEY_CREATED_AT + " TEXT" + ")";
        db.execSQL(CREATE_LOGIN_TABLE);

        Log.d(TAG, "Database tables created");
    }

    // Upgrading database
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // Drop older table if existed
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_LOGIN);

        // Create tables again
        onCreate(db);
    }

    /**
     * Storing user details in database
     * */
    public void addUser(String name, String email, String uid, String created_at) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_NAME, name); // Name
        values.put(KEY_EMAIL, email); // Email
        values.put(KEY_UID, uid); // Email
        values.put(KEY_CREATED_AT, created_at); // Created At

        // Inserting Row
        long id = db.insert(TABLE_LOGIN, null, values);
        db.close(); // Closing database connection

        Log.d(TAG, "New user inserted into sqlite: " + id);
    }

    /**
     * Getting user data from database
     * */
    public HashMap<String, String> getUserDetails() {
        HashMap<String, String> user = new HashMap<String, String>();
        String selectQuery = "SELECT  * FROM " + TABLE_LOGIN;

        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);
        // Move to first row
        cursor.moveToFirst();
        if (cursor.getCount() > 0) {
            user.put("name", cursor.getString(1));
            user.put("email", cursor.getString(2));
            user.put("uid", cursor.getString(3));
            user.put("created_at", cursor.getString(4));
        }
        cursor.close();
        db.close();
        // return user
        Log.d(TAG, "Fetching user from Sqlite: " + user.toString());

        return user;
    }

    /**
     * Getting user login status return true if rows are there in table
     * */
    public int getRowCount() {
        String countQuery = "SELECT  * FROM " + TABLE_LOGIN;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(countQuery, null);
        int rowCount = cursor.getCount();
        db.close();
        cursor.close();

        // return row count
        return rowCount;
    }

    /**
     * Re crate database Delete all tables and create them again
     * */
    public void deleteUsers() {
        SQLiteDatabase db = this.getWritableDatabase();
        // Delete All Rows
        db.delete(TABLE_LOGIN, null, null);
        db.close();

        Log.d(TAG, "Deleted all user info from sqlite");
    }

}

activity_login.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/s"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="10dp" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:orientation="vertical"
        android:paddingLeft="20dp"
        android:paddingRight="20dp" >

        <EditText
            android:id="@+id/email"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:ems="10"
            android:hint="@string/hint_email"
            android:inputType="textEmailAddress"
            android:padding="10dp"
            android:singleLine="true" />

        <EditText
            android:id="@+id/password"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:hint="@string/hint_password"
            android:inputType="textPassword"
            android:padding="10dp"
            android:singleLine="true" />

        <!-- Login Button -->

        <Button
            android:id="@+id/btnLogin"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dip"
            android:text="@string/btn_login" />

        <!-- Link to Login Screen -->

        <Button
            android:id="@+id/btnLinkToRegisterScreen"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dip"
            android:background="@null"
            android:text="@string/btn_link_to_register"
            android:textAllCaps="false"
            android:textColor="@color/white"
            android:textSize="15dp" />
    </LinearLayout>

</LinearLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/s"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="10dp" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:orientation="vertical"
        android:paddingLeft="20dp"
        android:paddingRight="20dp" >

        <EditText
            android:id="@+id/name"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:hint="@string/hint_name"
            android:inputType="textCapWords"
            android:padding="10dp"
            android:singleLine="true" />

        <EditText
            android:id="@+id/email"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:hint="@string/hint_email"
            android:inputType="textEmailAddress"
            android:padding="10dp"
            android:singleLine="true"
            android:textColor="@color/input_register"
            android:textColorHint="@color/input_register_hint" />

        <EditText
            android:id="@+id/password"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:hint="@string/hint_password"
            android:inputType="textPassword"
            android:padding="10dp"
            android:singleLine="true"
            android:textColor="@color/input_register"
            android:textColorHint="@color/input_register_hint" />

        <!-- Login Button -->

        <Button
            android:id="@+id/btnRegister"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dip"
            android:background="#ea4c88"
            android:text="@string/btn_register"
            android:textColor="@color/white" />

        <!-- Link to Login Screen -->

        <Button
            android:id="@+id/btnLinkToLoginScreen"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dip"
            android:background="@null"
            android:text="@string/btn_link_to_login"
            android:textAllCaps="false"
            android:textColor="@color/white"
            android:textSize="15dp" />
    </LinearLayout>

</LinearLayout>

Activity_regester.java

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="@drawable/s"

    android:gravity="center"

    android:orientation="vertical"

    android:padding="10dp" >



    <LinearLayout

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:orientation="vertical"

        android:paddingLeft="20dp"

        android:paddingRight="20dp" >



        <EditText

            android:id="@+id/name"

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            android:layout_marginBottom="10dp"

            android:hint="@string/hint_name"

            android:inputType="textCapWords"

            android:padding="10dp"

            android:singleLine="true" />



        <EditText

            android:id="@+id/email"

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            android:layout_marginBottom="10dp"

            android:hint="@string/hint_email"

            android:inputType="textEmailAddress"

            android:padding="10dp"

            android:singleLine="true"

            android:textColor="@color/input_register"

            android:textColorHint="@color/input_register_hint" />



        <EditText

            android:id="@+id/password"

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            android:layout_marginBottom="10dp"

            android:hint="@string/hint_password"

            android:inputType="textPassword"

            android:padding="10dp"

            android:singleLine="true"

            android:textColor="@color/input_register"

            android:textColorHint="@color/input_register_hint" />



        <!-- Login Button -->



        <Button

            android:id="@+id/btnRegister"

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            android:layout_marginTop="20dip"

            android:background="#ea4c88"

            android:text="@string/btn_register"

            android:textColor="@color/white" />



        <!-- Link to Login Screen -->



        <Button

            android:id="@+id/btnLinkToLoginScreen"

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            android:layout_marginTop="40dip"

            android:background="@null"

            android:text="@string/btn_link_to_login"

            android:textAllCaps="false"

            android:textColor="@color/white"

            android:textSize="15dp" />

    </LinearLayout>



</LinearLayout>

String.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <string name="hint_email">Email</string>

    <string name="hint_password">Password</string>

    <string name="hint_name">Fullname</string>

    <string name="btn_login">LOGIN</string>

    <string name="btn_register">REGISTER</string>

    <string name="btn_link_to_register">Not a member? Sign up now.</string>

    <string name="btn_link_to_login">Already registred! Login Me.</string>

    <string name="welcome">Welcome</string>

    <string name="btn_logout">LOGOUT</string>

    <string name="name">Fullname</string>



</resources>

INDEX.php

<?php



/**

 * File to handle all API requests

 * Accepts GET and POST

 *

 * Each request will be identified by TAG

 * Response will be JSON data



  /**

 * check for POST request

 */

if (isset($_POST['tag']) && $_POST['tag'] != '') {

    // get tag

    $tag = $_POST['tag'];



    // include db handler

    require_once 'include/DB_Functions.php';

    $db = new DB_Functions();



    // response Array

    $response = array("tag" => $tag, "error" => FALSE);



    // check for tag type

    if ($tag == 'login') {

        // Request type is check Login

        $email = $_POST['email'];

        $password = $_POST['password'];



        // check for user

        $user = $db->getUserByEmailAndPassword($email, $password);

        if ($user != false) {

            // user found

            $response["error"] = FALSE;

            $response["uid"] = $user["unique_id"];

            $response["user"]["name"] = $user["name"];

            $response["user"]["email"] = $user["email"];

            $response["user"]["created_at"] = $user["created_at"];

            $response["user"]["updated_at"] = $user["updated_at"];

            echo json_encode($response);

        } else {

            // user not found

            // echo json with error = 1

            $response["error"] = TRUE;

            $response["error_msg"] = "Incorrect email or password!";

            echo json_encode($response);

        }

    } else if ($tag == 'register') {

        // Request type is Register new user

        $name = $_POST['name'];

        $email = $_POST['email'];

        $password = $_POST['password'];



        // check if user is already existed

        if ($db->isUserExisted($email)) {

            // user is already existed - error response

            $response["error"] = TRUE;

            $response["error_msg"] = "User already existed";

            echo json_encode($response);

        } else {

            // store user

            $user = $db->storeUser($name, $email, $password);

            if ($user) {

                // user stored successfully

                $response["error"] = FALSE;

                $response["uid"] = $user["unique_id"];

                $response["user"]["name"] = $user["name"];

                $response["user"]["email"] = $user["email"];

                $response["user"]["created_at"] = $user["created_at"];

                $response["user"]["updated_at"] = $user["updated_at"];

                echo json_encode($response);

            } else {

                // user failed to store

                $response["error"] = TRUE;

                $response["error_msg"] = "Error occured in Registartion";

                echo json_encode($response);

            }

        }

    } else {

        // user failed to store

        $response["error"] = TRUE;

        $response["error_msg"] = "Unknow 'tag' value. It should be either 'login' or 'register'";

        echo json_encode($response);

    }

} else {

    $response["error"] = TRUE;

    $response["error_msg"] = "Required parameter 'tag' is missing!";

    echo json_encode($response);

}

?>

Config.php

<?php

/**
 * Database config variables
 */
define("DB_HOST", "localhost");
define("DB_USER", "root");
define("DB_PASSWORD", "");
define("DB_DATABASE", "android_api");
?> 

DB_Connect.php

<?php
class DB_Connect {

    // constructor
    function __construct() {
        
    }

    // destructor
    function __destruct() {
        // $this->close();
    }

    // Connecting to database
    public function connect() {
        require_once 'include/Config.php';
        // connecting to mysql
        $con = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD) or die(mysql_error());
        // selecting database
        mysql_select_db(DB_DATABASE) or die(mysql_error());

        // return database handler
        return $con;
    }

    // Closing database connection
    public function close() {
        mysql_close();
    }

}

?> 

DB_Functions.php

<?php

class DB_Functions {

    private $db;

    //put your code here
    // constructor
    function __construct() {
        require_once 'DB_Connect.php';
        // connecting to database
        $this->db = new DB_Connect();
        $this->db->connect();
    }

    // destructor
    function __destruct() {
        
    }

    /**
     * Storing new user
     * returns user details
     */
    public function storeUser($name, $email, $password) {
        $uuid = uniqid('', true);
        $hash = $this->hashSSHA($password);
        $encrypted_password = $hash["encrypted"]; // encrypted password
        $salt = $hash["salt"]; // salt
        $result = mysql_query("INSERT INTO users(unique_id, name, email, encrypted_password, salt, created_at) VALUES('$uuid', '$name', '$email', '$encrypted_password', '$salt', NOW())");
        // check for successful store
        if ($result) {
            // get user details 
            $uid = mysql_insert_id(); // last inserted id
            $result = mysql_query("SELECT * FROM users WHERE uid = $uid");
            // return user details
            return mysql_fetch_array($result);
        } else {
            return false;
        }
    }

    /**
     * Get user by email and password
     */
    public function getUserByEmailAndPassword($email, $password) {
        $result = mysql_query("SELECT * FROM users WHERE email = '$email'") or die(mysql_error());
        // check for result 
        $no_of_rows = mysql_num_rows($result);
        if ($no_of_rows > 0) {
            $result = mysql_fetch_array($result);
            $salt = $result['salt'];
            $encrypted_password = $result['encrypted_password'];
            $hash = $this->checkhashSSHA($salt, $password);
            // check for password equality
            if ($encrypted_password == $hash) {
                // user authentication details are correct
                return $result;
            }
        } else {
            // user not found
            return false;
        }
    }

    /**
     * Check user is existed or not
     */
    public function isUserExisted($email) {
        $result = mysql_query("SELECT email from users WHERE email = '$email'");
        $no_of_rows = mysql_num_rows($result);
        if ($no_of_rows > 0) {
            // user existed 
            return true;
        } else {
            // user not existed
            return false;
        }
    }

    /**
     * Encrypting password
     * @param password
     * returns salt and encrypted password
     */
    public function hashSSHA($password) {

        $salt = sha1(rand());
        $salt = substr($salt, 0, 10);
        $encrypted = base64_encode(sha1($password . $salt, true) . $salt);
        $hash = array("salt" => $salt, "encrypted" => $encrypted);
        return $hash;
    }

    /**
     * Decrypting password
     * @param salt, password
     * returns hash string
     */
    public function checkhashSSHA($salt, $password) {

        $hash = base64_encode(sha1($password . $salt, true) . $salt);

        return $hash;
    }

}

?>

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