login HomeWork

=====================================xml activity_man==========================================================
<RelativeLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:id="@+id/mainTag"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:hint="@string/hintUser"
        android:gravity="center"
        android:id="@+id/inUser"
        android:layout_marginTop="15sp"
        />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:inputType="textPassword"
        android:hint="@string/hintPass"
        android:gravity="center"
        android:id="@+id/inPass"
        android:layout_below="@+id/inUser"
        android:layout_marginTop="5sp"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:text="@string/btnLog"
        android:id="@+id/btnLog"
        android:layout_below="@+id/inPass"
        android:layout_marginTop="40sp"
        android:padding="20sp"
        android:onClick="btnLogIn"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/btnRegi"
        android:textSize="25sp"
        android:id="@+id/btnReg"
        android:layout_below="@+id/btnLog"
        android:layout_marginTop="10sp"
        android:padding="10sp"
        android:onClick="btnRegister"
        />
</RelativeLayout>
=============================================================================================================================
=========================================Java MainActivity===================================================================
package com.example.igor.mylogin;

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

public class MainActivity extends Activity
{
    public final static String PREFERENCE = "account";//name of the sharedprefrences file!

    private  SharedPreferences myPrefs; //calling SharedPrefrences Class
    private  SharedPreferences.Editor editor; //calling the editor for SharedPrefrences

    private   EditText userTxt; //username input
    private  EditText passTxt; //password input

    private static  String chkOnline; //will be used to check if the user is online!

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

        /*check if user exists or not!
        if user exists go to login page automaticly
        */

        if(chkUser())
        {
            //if keyfound start second activity
            Intent logIntent = new Intent(this, Logged.class);
            logIntent.putExtra("user", chkOnline);
            this.startActivity(logIntent);
        }

    }

    //ASSISTANCE METHODS

    //method that casts all our local variables with the ids of xml
    private void setPoints()
    {
        userTxt = (EditText)findViewById(R.id.inUser);
        passTxt = (EditText)findViewById(R.id.inPass);
        myPrefs = getApplicationContext().getSharedPreferences(PREFERENCE,MODE_PRIVATE);
        editor = myPrefs.edit();
    }

   private boolean chkUser()
    {
        chkOnline = myPrefs.getString("logged", "error");
        if(chkOnline.equals("error"))
        {
            return false;
        }
        else
        {
            return true;
        }
    }

    //inputs the username into logged
    //creates a value of username in the key logged making it appear full and not defualt
    private void apprOnline(String user)
    {
        editor.putString("logged",user);
        editor.commit();
    }

    //method that checks if the user filled all the fields, if the username is taken
    //if tha password matches and creates a user if all statements above are done right
    private void chkLog()
    {
        String user = userTxt.getText().toString();
        String pass = passTxt.getText().toString();

        if(user.trim().length() > 0 && pass.trim().length()>0)
        {
            String userName = null;
            String userPass = null;

            //if myPrefs contains username and the password input them into
            //userName and userPass Variables

            if(myPrefs.contains("user") && myPrefs.contains("password") )
            {
                userName = myPrefs.getString("user","");
                userPass = myPrefs.getString("password","");
            }


            //check if pass word and username match!

            if(user.equals(userName) && pass.equals(userPass))
            {
                //pop a toast welcome
                Toast.makeText(this,"Logged in succesfully",Toast.LENGTH_SHORT).show();
                //if the statement is true put a String value into logged
                apprOnline(user);
                // move to logged page
                Intent logIn = new Intent(this, Logged.class);
                this.startActivity(logIn);
            }
            else
            {
                //if pass and user do not match pop a toast
                Toast.makeText(this,"Wrong Username or Password",Toast.LENGTH_LONG).show();
            }
        }
        else
        {
            //user didnt add username or password
            Toast.makeText(this,"Please enter Username and Password",Toast.LENGTH_LONG).show();
        }
    }

    //BUTTONS

    //button that activates the the chkLog method and checks if all the fields and data are valid!
    public void btnLogIn(View v)
    {
        chkLog();
    }

    //button that takes the user to the registery page
    public void btnRegister(View v)
    {
        Intent rgstIntent = new Intent(this,Register.class);
        this.startActivity(rgstIntent);
    }

}

=======================================================================================================================================
==============================================xml activity_register====================================================================
<RelativeLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Registration"
        android:gravity="center"
        android:textSize="20sp"
        android:id="@+id/regLine"
        android:layout_marginTop="20sp"
        />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/hintUser"
        android:gravity="center"
        android:textSize="30sp"
        android:id="@+id/setUser"
        android:layout_below="@+id/regLine"
        android:layout_marginTop="15sp"
        />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/hintPass"
        android:inputType="textPassword"
        android:gravity="center"
        android:textSize="30sp"
        android:id="@+id/setPass"
        android:layout_below="@+id/setUser"
        android:layout_marginTop="30sp" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/confPass"
        android:inputType="textPassword"
        android:gravity="center"
        android:textSize="30sp"
        android:id="@+id/confPass"
        android:layout_below="@+id/setPass"
        android:layout_marginTop="30sp" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/btnRegi"
        android:textSize="30sp"
        android:id="@+id/tryReg"
        android:layout_below="@+id/confPass"
        android:layout_marginTop="10sp"
        android:onClick="btnRegister"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/canc"
        android:textSize="20sp"
        android:id="@+id/regCanc"
        android:layout_below="@+id/tryReg"
        android:layout_marginTop="20sp"
        android:onClick="btnCancle"
        />


</RelativeLayout>
===================================================================================================================================
==========================================Java Register============================================================================
package com.example.igor.mylogin;

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

/**
 * Created by Igor on 3/7/2016.
 */
public class Register extends Activity
{
    private  SharedPreferences myPrefs;//calling SharedPrefrences Class
    private  SharedPreferences.Editor editor;//calling the editor for SharedPrefrences


    private  EditText rgsUser; //the name a user wish to register with
    private  EditText rgsPass; //the password user wishes to use
    private  EditText chkPass; //check if user entered the password correctly


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

    //sets all the points connects our local variables with xml id's
    private void setPoints()
    {
        rgsUser = (EditText)findViewById(R.id.setUser);
        rgsPass = (EditText)findViewById(R.id.setPass);
        chkPass = (EditText)findViewById(R.id.confPass);
        myPrefs = getApplicationContext().getSharedPreferences(MainActivity.PREFERENCE, MODE_PRIVATE);
        editor = myPrefs.edit();
    }

    //method that checks all users data inpouted in the fields and registration of account if
    //data is valid
    private void chkReg()
    {
        String userName = rgsUser.getText().toString();
        String passWord = rgsPass.getText().toString();
        String checkPass = chkPass.getText().toString();
        String chkUser = null;// will be used to check if the name is taken




        if(userName.trim().length()<=0 || passWord.trim().length()<=0 || checkPass.trim().length()<=0)
        {
            //if one of the fields is empty pop toast message
            Toast.makeText(this,"Error, please fill all the fields",Toast.LENGTH_LONG).show();
        }
        else if(!checkPass.equals(passWord))
        {
            //if confirm password doesnt equal to the password pop toast message
            Toast.makeText(this,"Error, please make sure the passwords match!",Toast.LENGTH_LONG).show();
        }
        else if(userName.equals(myPrefs.getString("user",chkUser)))
        {
            Toast.makeText(this,"Error, This username is already taken",Toast.LENGTH_LONG).show();
        }
        else
        {
            //pop message that data has been saved successfully!
            Toast.makeText(this,"Success! Account Registered!",Toast.LENGTH_LONG).show();

            //if everything works save the data using the following keys
            editor.putString("user", userName);
            editor.putString("password", passWord);

            //commit the file
            editor.commit();

            //move to the main page (login scrren)
            Intent toLog = new Intent(this, MainActivity.class);
            this.startActivity(toLog);
        }
    }

    //calls the chkReg method checking if all the fields and data are valid!
    public void btnRegister(View v)
    {
        chkReg();
    }

    //activates the canlce button
    public void btnCancle(View v)
    {
        Intent cnlReg = new Intent(this,MainActivity.class);
        this.startActivity(cnlReg);
    }


}
=============================================================================================================================
=============================================xml activity_logged=============================================================
<RelativeLayout
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:id="@+id/logPage"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/logMsg"
        android:layout_marginTop="25sp"
        android:textSize="50sp"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnOut"
        android:layout_below="@+id/logMsg"
        android:text="@string/btnLogOut"
        android:textSize="30sp"
        android:gravity="center"
        android:layout_marginTop="20sp"
        android:onClick="exitBtn"
        />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="Created by Igor"
        android:id="@+id/whoLog"/>
</RelativeLayout>
==============================================================================================================================
============================================Java Logged=======================================================================
package com.example.igor.mylogin;

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

/**
 * Created by Igor on 3/7/2016.
 */
public class Logged extends Activity
{

    SharedPreferences myPrefs; //calling SharedPrefrences Class
    SharedPreferences.Editor editor;//calling the editor for SharedPrefrences

    TextView userLogged; //what kind of user is logged in

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_logged);
        setPoints();
        userLogged.setText("Greetings " + getUserName());
    }

    //ASSISTANCE METHODS

    //sets all the points
    private void setPoints()
    {
        userLogged = (TextView)findViewById(R.id.logMsg);
        myPrefs = getApplicationContext().getSharedPreferences(MainActivity.PREFERENCE,MODE_PRIVATE);
        editor = myPrefs.edit();
    }

    //returns a String value of key user
    private String getUserName()
    {
        String userName = myPrefs.getString("user","offline");
        return userName;
    }

    public void exitBtn(View v)
    {
        editor.remove("logged");
        editor.commit();

        Intent exitPage = new Intent(this, MainActivity.class);
        this.startActivity(exitPage);
    }


}
============================================================================================================================