How to create Android user registration using shared preferences with string

---

MainActivity.java

package com.example.admin.test;

import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity {
    SharedPreferences pref;
    Boolean isFirstRun;
    SharedPreferences.Editor editor;
    String firstName;
    String lastName;
    String email;
    String phoneNumber;
    String userName;
    String password;
    String prefFirstName,prefLastName,prefEmail,prefPhoneNumber,prefUserName,prefPassword;


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

        pref=getApplicationContext().getSharedPreferences("Mypref", MODE_PRIVATE);
        editor=pref.edit();

        //checking app for running first time
        isFirstRun=getSharedPreferences("preferences", MODE_PRIVATE).getBoolean("isfirstrun", true);




        Button signUp= (Button) findViewById(R.id.sign_up);
        final Button logIn=(Button) findViewById(R.id.log_in);




        //signUp button working
        signUp.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v) {





                    firstName=((EditText) findViewById(R.id.first_name)).getText().toString();
                    lastName=((EditText) findViewById(R.id.last_name)).getText().toString();
                    userName=((EditText) findViewById(R.id.user_name)).getText().toString();
                    password=((EditText) findViewById(R.id.pass)).getText().toString();
                    email=((EditText) findViewById(R.id.email)).getText().toString();
                    phoneNumber=((EditText) findViewById(R.id.phone_number)).getText().toString();

                if(isFirstRun)
                {
                    editor.putString("first_name", firstName);
                    editor.putString("last_name", lastName);
                    editor.putString("user_name", userName);
                    editor.putString("pass", password);
                    editor.putString("email", email);
                    editor.putString("phone_number", phoneNumber);
                    editor.commit();
                    getSharedPreferences("preferences", MODE_PRIVATE).edit().putBoolean("isfirstrun", false).commit();
                }

                else {
                    prefFirstName = pref.getString("first_name", null);
                    prefLastName = pref.getString("last_name", null);
                    prefUserName = pref.getString("user_name", null);
                    prefPassword = pref.getString("pass", null);
                    prefEmail = pref.getString("email", null);
                    prefPhoneNumber = pref.getString("phone_number", null);

                    prefFirstName += "," + firstName;
                    prefLastName += "," + lastName;
                    prefUserName += "," + userName;
                    prefPassword += "," + password;
                    prefEmail += "," + email;
                    prefPhoneNumber += "," + phoneNumber;


                    editor.putString("first_name", prefFirstName);
                    editor.putString("last_name", prefLastName);
                    editor.putString("user_name", prefUserName);
                    editor.putString("pass", prefPassword);
                    editor.putString("email", prefEmail);
                    editor.putString("phone_number", prefPhoneNumber);
                    editor.commit();
                }


             Intent i=new Intent(getApplicationContext(),LogIn.class);
                startActivity(i);
                finish();
            }
        });

        //logIn button working
        logIn.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v) {
                Intent i=new Intent(getApplicationContext(),LogIn.class);
                startActivity(i);
                finish();
            }
        });

    }
}

---

Login.java

package com.example.admin.test;

import android.content.Intent;

import android.content.SharedPreferences;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

import java.sql.SQLOutput;

public class LogIn extends AppCompatActivity {

    String userName;

    String password;

    SharedPreferences pref;

    String firstName[];

    String lastName[];

    String userNameArray[];

    String passwordArray[];

    String email[];

    String phoneNumber[];

    int i,flag=0;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_log_in);

        pref=getSharedPreferences("Mypref",MODE_PRIVATE);

        //sharedpref data

        String prefFirstName=pref.getString("first_name",null);

        String prefLastName=pref.getString("last_name",null);

        String prefUserName=pref.getString("user_name",null);

        String prefPassword=pref.getString("pass",null);

        String prefEmail=pref.getString("email",null);

        String prefPhoneNumber=pref.getString("phone_number", null);

        //splitting

        firstName=prefFirstName.split(",");

        lastName=prefLastName.split(",");

        userNameArray=prefUserName.split(",");

        passwordArray=prefPassword.split(",");

        email=prefEmail.split(",");

        phoneNumber=prefPhoneNumber.split(",");

       Button logIn= (Button) findViewById(R.id.sign_in);

        //log in button working

        logIn.setOnClickListener(new View.OnClickListener()

        {

            @Override

            public void onClick(View v) {

                userName=((EditText) findViewById(R.id.user_name)).getText().toString();

                password=((EditText) findViewById(R.id.password)).getText().toString();

                for(i=0;i<firstName.length;i++)

                {

                    if(userName.equalsIgnoreCase(userNameArray[i]))

                    {

                        Intent welcome=new Intent(getApplicationContext(),Welcome.class);

                        welcome.putExtra("first_name",firstName[i]);

                        welcome.putExtra("last_name",lastName[i]);

                        welcome.putExtra("user_name",userNameArray[i]);

                        welcome.putExtra("password",passwordArray[i]);

                        welcome.putExtra("email",email[i]);

                        welcome.putExtra("phone_number",phoneNumber[i]);

                        startActivity(welcome);

                        finish();

                    }

                    else

                    {

                        flag=1;

                    }

                }

                if (flag==1)

                {

                    Toast.makeText(getApplicationContext(), "you are not registered", Toast.LENGTH_SHORT).show();

                }

            }

        });

    }

}

---

Welcome.java

package com.example.admin.test;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.TextView;

public class Welcome extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_welcome);

        Bundle i=getIntent().getExtras();

        String firstName=i.getString("first_name");

        String lastName=i.getString("last_name");

        String userName=i.getString("user_name");

        String password=i.getString("password");

        String email=i.getString("email");

        String phoneNumber=i.getString("phone_number");

        //initializing textview

        TextView firstNameText= (TextView) findViewById(R.id.first_name_get);

        TextView lastNameText= (TextView) findViewById(R.id.last_name_get);

        TextView userNameText= (TextView) findViewById(R.id.user_name_get);

        TextView passwordText= (TextView) findViewById(R.id.password_get);

        TextView emailText= (TextView) findViewById(R.id.email_get);

        TextView phoneNumberText= (TextView) findViewById(R.id.phone_number_get);

        //putting values in textviews

        firstNameText.setText(firstName);

        lastNameText.setText(lastName);

        userNameText.setText(userName);

        passwordText.setText(password);

        emailText.setText(email);

        phoneNumberText.setText(phoneNumber);

    }

}

---

Layouts

activity_log_in.xml

<LinearLayout

    android:layout_width="fill_parent"

    android:layout_height="fill_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:text="Login"

    android:gravity="center_horizontal"

    android:textSize="50dp"/>

    <EditText

        android:id="@+id/user_name"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="User name"

        android:layout_marginTop="30dp"

        />

    <EditText

        android:id="@+id/password"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="Password"

        />

    <Button

        android:layout_width="wrap_content"

        android:layout_gravity="right"

        android:layout_height="wrap_content"

        android:id="@+id/sign_in"

        android:text="sign in"/>

</LinearLayout>


activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:layout_height="fill_parent"
    android:layout_width="fill_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:text="Registration"
    android:gravity="center_horizontal"
    android:textSize="50dp"/>
    <EditText
        android:id="@+id/first_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="First Name"
        android:layout_marginTop="30dp"/>
    <EditText
        android:id="@+id/last_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Last Name"
        android:layout_marginTop="10dp"/>
    <EditText
        android:id="@+id/user_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="User name"
        android:layout_marginTop="10dp"/>
    <EditText
        android:id="@+id/pass"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Password"
        android:layout_marginTop="10dp"/>
    <EditText
        android:id="@+id/email"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="email"
        android:layout_marginTop="10dp"/>
    <EditText
        android:id="@+id/phone_number"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Phone number"
        android:layout_marginTop="10dp"/>
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:layout_margin="10dp">
    <Button
        android:id="@+id/sign_up"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="Sign up"
        android:layout_weight="1"/>
    <Button
        android:id="@+id/log_in"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="Log in"
        android:layout_weight="1" />

</LinearLayout>
</LinearLayout>


activity_welcome.xml

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

    <TextView
        android:id="@+id/first_name_get"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/last_name_get"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/user_name_get"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/password_get"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/email_get"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/phone_number_get"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

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