HomeWork Registration

Main Activity Java///////////////////////////////

package com.mordekicloud.yuli.user123;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {


    EditText txtUserName;
    EditText txtPassword;

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

        txtUserName = (EditText) findViewById(R.id.txtUser1);
        txtPassword = (EditText) findViewById(R.id.txtPass1);

        if (CheckUser()) {
            SharedPreferences
                    pref = getApplicationContext().getSharedPreferences("Pref", MODE_PRIVATE);
            Intent loggedIntent = new Intent(this, Daf3.class);
            loggedIntent.putExtra("userPut", pref.getString("Logged In", "Error"));


            this.startActivity(loggedIntent);
        }
    }


        private boolean CheckUser ()
        {
            SharedPreferences
                    pref = getApplicationContext().getSharedPreferences("user", MODE_PRIVATE);
            String userName = pref.getString("Logged In", "Error");
            return (!userName.equals("Error"));
        }

    public void  btnLogIn(View v) {
        SharedPreferences pref =
                getApplicationContext().getSharedPreferences("user", MODE_PRIVATE);
        String logUserName = txtUserName.getText().toString().toLowerCase();
        String logPassword = txtPassword.getText().toString();
        String logPasswordConf = pref.getString(logUserName, "Error");

        if (logUserName.isEmpty() || logPassword.isEmpty()) {
            Toast.makeText(this, "Ther is one or more fields empty", Toast.LENGTH_LONG).show();
            return;
        }
        else if (!pref.contains(logUserName) || !logPassword.equals(logPasswordConf)) {
                Toast.makeText(this, "Invald user name or password", Toast.LENGTH_LONG).show();
                return;
            }
         else {
            SharedPreferences.Editor editor = pref.edit();
            editor.putString("Logged", logUserName).commit();

            Toast.makeText(this, "You logged successfuly", Toast.LENGTH_SHORT).show();
            Intent loggedIntent = new Intent(this, Daf3.class);
            loggedIntent.putExtra("userPut", pref.getString("Logged", "Error"));
            this.startActivity(loggedIntent);
        }
        }



            public void btnSingUp (View v)
            {
                Intent singIntent = new Intent(this, Daf2.class);
                this.startActivity(singIntent);
            }



        }


Daf2 java//////////////////////////////////////

package com.mordekicloud.yuli.user123;

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;

import java.util.IllegalFormatCodePointException;

/**
 * Created by yuli.mordek on 3/11/2016.
 */
public class Daf2 extends Activity
{
    EditText txtUserName;
    EditText txtPassword;
    EditText txtComfPass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.daf2);
        txtUserName=(EditText)findViewById(R.id.UserName);
        txtPassword=(EditText)findViewById(R.id.Password);
        txtComfPass=(EditText)findViewById(R.id.ConfPass);

    }

    public void btnCancel (View v)
    {
        Intent cancelIntent=new Intent(this, MainActivity.class);
        this.startActivity(cancelIntent);
    }

    public void btnEnter(View v)
    {
        SharedPreferences
                pref=getApplicationContext().getSharedPreferences("user",MODE_PRIVATE);
        SharedPreferences.Editor editor=pref.edit();

        String  UserName=txtUserName.getText().toString().toLowerCase();
        String  Password=txtPassword.getText().toString().toLowerCase();
        String  ConfPass=txtComfPass.getText().toString().toLowerCase();

        if (UserName.isEmpty() || Password.isEmpty() || ConfPass.isEmpty())
        {
            Toast.makeText(this,"You must fill all fields",Toast.LENGTH_LONG).show();
            return;
        }
        else if(pref.contains(UserName))
        {
            Toast.makeText(this,"User you exists",Toast.LENGTH_SHORT).show();
            return;
        }

        else if (!Password.equals(ConfPass))
        {
            Toast.makeText(this, "Password is not correct", Toast.LENGTH_LONG).show();
            return;
        }
        Toast.makeText(this, "You registreted successful", Toast.LENGTH_SHORT).show();
        editor.putString(UserName, Password).commit();
        Intent registerIntent = new Intent(this,MainActivity.class);
        this.startActivity(registerIntent);

    }
}


Daf3 Java////////////////////////////////////

package com.mordekicloud.yuli.user123;

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 yuli.mordek on 3/11/2016.
 */
public class Daf3 extends Activity
{
    TextView txtUser1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.daf3);
        txtUser1=(TextView)findViewById(R.id.Msg);
        txtUser1.setText("Hiiiiiiiii!!"+getIntent().getStringExtra("userPut"));

    }
public void btnOut(View v)
{
    SharedPreferences
            pref=getApplicationContext().getSharedPreferences("user",MODE_PRIVATE);
    SharedPreferences.Editor editor=pref.edit();
    editor.remove("Logged").commit();
    Intent outIntent=new Intent(this,MainActivity.class);
    this.startActivity(outIntent);

}

}


main activity XML///////////////////////////

<LinearLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_marginBottom="20dp"
        android:layout_margin="15dp"
        android:hint="User Name"
        android:textSize="25sp"
        android:gravity="center"
        android:id="@+id/txtUser1"
        android:inputType="text"
        />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:layout_margin="15dp"
        android:textSize="25sp"
        android:hint="Password"
        android:gravity="center"
        android:id="@+id/txtPass1"
        android:inputType="textPassword"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginBottom="20dp"
        android:text="Log In"
        android:textSize="25sp"
        android:onClick="btnLogIn"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:text="Sing Up"
        android:textSize="25sp"
        android:onClick="btnSingUp"
        />

    </LinearLayout>


daf2 XML//////////////////////////////

<LinearLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:layout_marginTop="20dp"
        android:textSize="25sp"
        android:hint="Enter User Name"
        android:gravity="center"
        android:id="@+id/UserName"
        android:inputType="text"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:textSize="25sp"
        android:hint="Password"
        android:gravity="center"
        android:id="@+id/Password"
        android:inputType="text"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:hint="Confirm Password"
        android:textSize="25sp"
        android:gravity="center"
        android:id="@+id/ConfPass"
        android:inputType="text"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:text="Enter"
        android:textSize="25sp"
        android:onClick="btnEnter"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:text="Cancel"
        android:textSize="25sp"
        android:onClick="btnCancel" />
</LinearLayout>

daf3 XML////////////////////////////////////

<LinearLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/Msg"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Logout"
        android:textSize="25sp"
        android:layout_margin="15dp"
        android:onClick="btnOut"
        />

</LinearLayout>