Part 19 - Simple SharedPreferences

 Java Part : 

package first.learn.sharedpreference;

import static first.learn.sharedpreference.Common.getBooleanFromPref;
import static first.learn.sharedpreference.Common.getStringFromPref;
import static first.learn.sharedpreference.Common.saveBooleanToPref;
import static first.learn.sharedpreference.Common.saveStringToPref;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {


    public  static final  String NAME = "NAME" ;
    public  static final  String ADDRESS = "ADDRESS" ;
    public  static final  String AGE = "AGE" ;
    public  static final  String MARITAL_STATUS = "MARITAL_STATUS" ;


    private  String name = "";
    private  String age = "";
    private  String address= "";
    private  boolean maritalStatus = false ;




    EditText etAddress,
    etAge,
            etName;

    CheckBox checkbox;
    Button btnSave, btnShow;





    Context mContext ;

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

        mContext = this ;


        etAddress  = (EditText)findViewById(R.id.etAddress);
        etAge = (EditText)findViewById(R.id.etAge);
        etName = (EditText)findViewById(R.id.etName);
        checkbox = (CheckBox) findViewById(R.id.checkbox);



        btnSave = (Button) findViewById(R.id.btnSave);
        btnShow = (Button) findViewById(R.id.btnShow);


        btnSave.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                if(!isEditTextHasText(etName)
                || !isEditTextHasText(etAge)
                || !isEditTextHasText(etAddress)){

                    Toast.makeText(MainActivity.this, "Please Fill All The Field", Toast.LENGTH_SHORT).show();
                    return;
                }


                name = etName.getText().toString();
                age = etAge.getText().toString();
                address = etAddress.getText().toString();

                saveStringToPref(mContext, NAME,name );
                saveStringToPref(mContext, ADDRESS,address );
                saveStringToPref(mContext, AGE,  age );



                maritalStatus = checkbox.isChecked();
                saveBooleanToPref(mContext, MARITAL_STATUS,  maritalStatus  );

                Toast.makeText(mContext, "Saved SuccessFully", Toast.LENGTH_SHORT).show();


            }
        });


        btnShow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                name  = getStringFromPref( mContext, NAME , "Not Saved");
                etName.setText(name);

                address = getStringFromPref(mContext, ADDRESS, "No Address");
                etAddress.setText(address);

                age = getStringFromPref(mContext, AGE, "No Age");
                etAge.setText(age);

                maritalStatus = getBooleanFromPref ( mContext,  MARITAL_STATUS, false);

                checkbox.setChecked(maritalStatus);


                Toast.makeText(mContext, "Alhamdulillah, Data Retrieve Successfully", Toast.LENGTH_SHORT).show();



            }
        });







    }

    boolean isEditTextHasText (EditText editText){

        String s = editText.getText().toString();

        if(TextUtils.isEmpty(s)){
            return  false ;
        }else {
            return  true ;
        }

    }




}

xml Part : 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:layout_margin="16dp">

   <EditText
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:hint="name....."
       android:id="@+id/etName"/>


    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="age....."
        android:id="@+id/etAge"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="address....."
        android:id="@+id/etAddress"/>

    <CheckBox
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Marital Status"
        android:id="@+id/checkbox"/>


    <Button
        android:layout_marginTop="15dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnSave"
        android:text="Save"/>

    <Button
        android:layout_marginTop="15dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnShow"
        android:text="Retrieve"/>


</LinearLayout>

Common Class : 

package first.learn.sharedpreference;

import android.content.Context;
import android.content.SharedPreferences;
import android.widget.Toast;

public class Common {


    public  static  void saveStringToPref(Context mContext, String packageName, String value ){

        SharedPreferences settings = mContext.getSharedPreferences("MyPref", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = settings.edit();

        editor.putString(packageName, value);
        editor.apply();

    }


    public  static  void saveBooleanToPref(Context mContext, String packageName, boolean value ){

        SharedPreferences settings = mContext.getSharedPreferences("MyPref", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = settings.edit();

        editor.putBoolean(packageName, value);
        editor.apply();

    }


    public  static  String getStringFromPref(Context mContext, String packetName, String defaultValue){

        String s = defaultValue ;

        SharedPreferences settings = mContext.getSharedPreferences("MyPref", Context.MODE_PRIVATE);


         s = settings.getString(packetName, defaultValue);

         return  s ;


    }

    public  static  boolean getBooleanFromPref (Context mContext, String packageName, boolean value){

        SharedPreferences settings = mContext.getSharedPreferences("MyPref", Context.MODE_PRIVATE);


        boolean b = settings.getBoolean(packageName, value);

        return  b ;

    }




}

Part 18 - Pass data to next Activity - method 7 and 8

 java part one : 

package first.learn.datapassingtwo;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.google.gson.Gson;

import first.learn.datapassingtwo.Person.PersonModel;

public class MainActivity extends AppCompatActivity {


    public  static String SIMPLE_STRING = null;
    public  static  int  SIMPLE_INT = -0;

    EditText etOne, etTwo ,etThree,
    etFour, etSix,
    etFive;
    Button btnSimpleInt,
    btnSimpleString;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        etOne = (EditText) findViewById(R.id.etOne);
        etTwo = (EditText) findViewById(R.id.etTwo);

        btnSimpleInt = (Button)findViewById(R.id.btnSimpleInt);
        btnSimpleString = (Button)findViewById(R.id.btnSimpleString);

        etThree = (EditText)findViewById(R.id.etThree);
        etFour = (EditText)findViewById(R.id.etFour);

        etSix= (EditText)findViewById(R.id.etSix);
        etFive= (EditText)findViewById(R.id.etFive);


        btnSimpleString.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String name = etOne.getText().toString();

                if(TextUtils.isEmpty(name)){
                    etOne.setError("Empty");
                    return;
                }

                etOne.setError(null);



                Intent intent = new Intent(Intent.ACTION_VIEW);
                Uri data = Uri.parse("####://"+name);
                intent.setData(data);
                startActivity(intent);





            }
        });




        btnSimpleInt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String s = etTwo.getText().toString();
                if(TextUtils.isEmpty(s)){
                    etTwo.setError("Empty");
                    return;
                }

                etTwo.setError(null);


                Intent intent = new Intent(Intent.ACTION_VIEW);
                Uri data = Uri.parse("#####://myhost/"+s);
                intent.setData(data);
                startActivity(intent);


            }
        });

    }





}

xml part one : 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:layout_margin="16dp">


    <EditText
        android:hint="only by Scheme......"
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etOne"/>

    <EditText
        android:visibility="gone"
        android:hint="age....."
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etThree"/>


    <EditText
        android:visibility="gone"
        android:hint="address....."
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etFive"/>


    <EditText
        android:visibility="gone"
        android:hint="MobileNumber.....(optional)"
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etSix"/>

    <Button
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnSimpleString"
        android:text="Data passing with Manifest Scheme"/>


    <EditText
        android:hint="Scheme and Host ....."
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etTwo"
       />


    <EditText
        android:visibility="gone"
        android:hint="Simple int ....."
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etFour"
        android:inputType="number"/>


    <Button
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnSimpleInt"
        android:text="Data Passing By Scheme And Host "/>









</LinearLayout>

java part two : 

package first.learn.datapassingtwo;

import androidx.appcompat.app.AppCompatActivity;

import android.net.Uri;
import android.os.Bundle;
import android.widget.TextView;

public class DataGettingByManifestOnlyScheme extends AppCompatActivity {


    TextView tvShow ;

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

        tvShow = (TextView) findViewById(R.id.tvShow);


        if(getIntent()!=null){

            if(getIntent().getData()!=null){

                Uri data = getIntent().getData();
                String host = data.getHost();

                System.out.println("Only Scheme Host : "+ host);

                tvShow.setText(host);

            }

        }


    }
}

xml part two : 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".DataGettingByManifestOnlyScheme"
    android:orientation="vertical">


    <TextView
        android:hint="data....."
        android:layout_marginTop="25dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="@color/purple_700"
        android:textSize="25dp"
        android:id="@+id/tvShow"/>




</LinearLayout>

java part three : 

package first.learn.datapassingtwo;

import androidx.appcompat.app.AppCompatActivity;

import android.net.Uri;
import android.os.Bundle;
import android.widget.TextView;

public class DataGettingBySchemeAndHost extends AppCompatActivity {


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


        tvShow = (TextView) findViewById(R.id.tvShow);

        if(getIntent()!=null){

            if(getIntent().getData()!=null){

                Uri data = getIntent().getData();
                String myString = data.getLastPathSegment();

                System.out.println("Scheme and Host : "+ myString);

                tvShow.setText(myString);

            }

        }



    }
}

xml part three : 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".DataGettingBySchemeAndHost"
    android:orientation="vertical">


    <TextView
        android:layout_marginTop="30dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="@color/purple_700"
        android:textSize="25dp"
        android:id="@+id/tvShow"/>



</LinearLayout>

Manifest : 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/Theme.DataPassingTwo"
        tools:targetApi="31">

        <activity
            android:name=".DataGettingBySchemeAndHost"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data android:scheme="#####"
                    android:host="myhost"/>
            </intent-filter>

        </activity>

        <activity
            android:name=".DataGettingByManifestOnlyScheme"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data android:scheme="####" />
            </intent-filter>
        </activity>
        <activity
            android:name=".DataGettingActivity"
            android:exported="false" />
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>


    </application>

</manifest>

part 17 : Data Passing - Model Class - source code

 Java Part One : 

package first.learn.datapassingtwo;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.google.gson.Gson;

import first.learn.datapassingtwo.Person.PersonModel;

public class MainActivity extends AppCompatActivity {


    public  static String SIMPLE_STRING = null;
    public  static  int  SIMPLE_INT = -0;

    EditText etOne, etTwo ,etThree,
    etFour, etSix,
    etFive;
    Button btnSimpleInt,
    btnSimpleString;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        etOne = (EditText) findViewById(R.id.etOne);
        etTwo = (EditText) findViewById(R.id.etTwo);

        btnSimpleInt = (Button)findViewById(R.id.btnSimpleInt);
        btnSimpleString = (Button)findViewById(R.id.btnSimpleString);

        etThree = (EditText)findViewById(R.id.etThree);
        etFour = (EditText)findViewById(R.id.etFour);

        etSix= (EditText)findViewById(R.id.etSix);
        etFive= (EditText)findViewById(R.id.etFive);


        btnSimpleString.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String name = etOne.getText().toString();

                if(TextUtils.isEmpty(name)){
                    etOne.setError("Empty");
                    return;
                }



                String age = etThree.getText().toString();
                if(TextUtils.isEmpty(age)){
                    etThree.setError("Empty");
                    return;
                }

                String address = etFive.getText().toString();
                if(TextUtils.isEmpty(age)){
                    etFive.setError("Empty");
                    return;
                }


                etOne.setError(null);
                etThree.setError(null);
                etFive.setError(null);

                String mobileNumber = "No mobile Number";

                mobileNumber = etSix.getText().toString();

                if(TextUtils.isEmpty(mobileNumber)){
                    mobileNumber = "No mobile Number";
                }



                PersonModel personModel = new PersonModel();
                personModel.setName(name);
                personModel.setAge(age);
                personModel.setAddress(address);
                personModel.setMobileNumber(mobileNumber);


                String stringToPass = new  Gson().toJson(personModel);

                System.out.println("Json String : "+ stringToPass);


                Intent intent = new Intent(MainActivity.this, DataGettingActivity.class);
                intent.putExtra("OneModelData", stringToPass);
                startActivity(intent);


            }
        });


        btnSimpleInt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String s = etTwo.getText().toString();
                if(TextUtils.isEmpty(s)){
                    etTwo.setError("Empty");
                    return;
                }

                etTwo.setError(null);

                String t = etFour.getText().toString();

                int q = -0 ;

                try {
                    q = Integer.parseInt(t);
                } catch (NumberFormatException e) {
                    throw new RuntimeException(e);
                }


                int p = -0;

                try {
                    p = Integer.parseInt(s);
                } catch (NumberFormatException e) {
                    throw new RuntimeException(e);
                }

                if(p==-0||q==-0){
                    Toast.makeText(MainActivity.this, "Please Write Valid Number", Toast.LENGTH_SHORT).show();
                    return;
                }

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

                Bundle bundle = new Bundle();
                bundle.putInt("SimpleIntOne", p);
                bundle.putInt("SimpleIntTwo", q);
                intent.putExtras(bundle);
                startActivity(intent);


            }
        });

    }





}

xml Part One : 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:layout_margin="16dp">


    <EditText
        android:hint="name....."
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etOne"/>

    <EditText
        android:hint="age....."
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etThree"/>


    <EditText
        android:hint="address....."
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etFive"/>


    <EditText
        android:hint="MobileNumber.....(optional)"
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etSix"/>

    <Button
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnSimpleString"
        android:text="Passing Model Data"/>


    <EditText
        android:hint="Simple int ....."
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etTwo"
        android:inputType="number"/>


    <EditText
        android:hint="Simple int ....."
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/etFour"
        android:inputType="number"/>


    <Button
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnSimpleInt"
        android:text="Button Simple Static Integer"/>









</LinearLayout>

Java Part Two : 

package first.learn.datapassingtwo;

import static first.learn.datapassingtwo.MainActivity.SIMPLE_INT;
import static first.learn.datapassingtwo.MainActivity.SIMPLE_STRING;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import com.google.gson.Gson;

import first.learn.datapassingtwo.Person.PersonModel;

public class DataGettingActivity extends AppCompatActivity {


    TextView tvShow;

    private String private_simple_string = null;
    private  int private_int = -0;

    @SuppressLint("SetTextI18n")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_data_getting);

        tvShow = (TextView) findViewById(R.id.tvShow);

        if(getIntent()!=null){

           if(getIntent().getStringExtra("SimpleString")!=null){

               String s = getIntent().getStringExtra("SimpleString");

               tvShow.setText(s);

           }

        }



        if(getIntent()!=null){

            if(getIntent().getIntExtra("SimpleInt", -0)!=-0){

                int p = getIntent().getIntExtra("SimpleInt", -25);
                tvShow.setText(""+p);

            }

        }


     if(SIMPLE_STRING!=null){

         tvShow.setText(SIMPLE_STRING);
         private_simple_string = SIMPLE_STRING;
         System.out.println("Taken STATIC String first : " + SIMPLE_STRING);


         SIMPLE_STRING = null;

         tvShow.setText(private_simple_string );

         System.out.println("Taken Private String : " + private_simple_string);
         System.out.println("Taken Static  String : " + SIMPLE_STRING);


         Toast.makeText(this, "Found : "+private_simple_string, Toast.LENGTH_SHORT).show();


     }


        if(SIMPLE_INT!=-0){

           private_int = SIMPLE_INT ;
           System.out.println("Static Int First : "+ SIMPLE_INT);

           SIMPLE_INT = -0 ;
           tvShow.setText(""+private_int);
           System.out.println("Static Int Second : "+ SIMPLE_INT);
           System.out.println(" private Int  : "+ private_int);

        }


        if(getIntent()!=null){

            if(getIntent().getExtras()!=null){

                Bundle bundle = getIntent().getExtras();

                if(bundle!=null) {
                    String a = bundle.getString("bundleStringOne");
                    String b = bundle.getString("bundleStringTwo");
                    System.out.println("a : "+ a +"  b : "+ b );

                    tvShow.setText(a + " -- "+b );

                }
            }
        }

        if(getIntent()!=null){

            if(getIntent().getExtras()!=null){

                Bundle bundle = getIntent().getExtras();

                if(bundle!=null) {

                    int a = bundle.getInt("SimpleIntOne");
                    int b = bundle.getInt("SimpleIntTwo");

                    System.out.println("a : "+ a +"  b : "+ b );

                    tvShow.setText(a + " -- "+b );

                }
            }
        }




        if(getIntent()!=null){

            if(getIntent().getStringExtra("OneModelData")!=null){

                String foundString = getIntent().getStringExtra("OneModelData");

                System.out.println("Json String get : "+ foundString);


                PersonModel personModel = new Gson().fromJson(foundString, PersonModel.class );

                String name = personModel.getName();
                String age = personModel.getAge();
                String address = personModel.getAddress();
                String phoneNumber = personModel.getMobileNumber();


                tvShow.setText(
                        "Name : "+name
                       + "\n\n" +"Age: "+ age
                                + "\n\n"+ "Address: "+ address
                                + "\n\n"+"MobileNumber: "+ phoneNumber
                );




            }
        }




    }



}

xml Part Two : 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".DataGettingActivity"
    android:orientation="vertical"
    android:layout_margin="16dp">


    <TextView
        android:hint="Data....."
        android:textSize="30dp"
        android:textColor="@color/purple_700"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tvShow"
        />




</LinearLayout>

Java Part 3 : 

package first.learn.datapassingtwo.Person;

public class PersonModel {

    String name, age, address, mobileNumber;

    public PersonModel() {
    }

    public PersonModel(String name, String age, String address, String mobileNumber) {
        this.name = name;
        this.age = age;
        this.address = address;
        this.mobileNumber = mobileNumber;
    }


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getMobileNumber() {
        return mobileNumber;
    }

    public void setMobileNumber(String mobileNumber) {
        this.mobileNumber = mobileNumber;
    }
}

Java Part Four : 

package first.learn.datapassingtwo.Person;

public class BusinessClass {

    String customerName, customerAddress, phone, quantity, unitPrice, totalPrice;

    public BusinessClass() {
    }

    public BusinessClass(String customerName, String customerAddress, String phone, String quantity, String unitPrice, String totalPrice) {
        this.customerName = customerName;
        this.customerAddress = customerAddress;
        this.phone = phone;
        this.quantity = quantity;
        this.unitPrice = unitPrice;
        this.totalPrice = totalPrice;
    }

    public String getCustomerName() {
        return customerName;
    }

    public void setCustomerName(String customerName) {
        this.customerName = customerName;
    }

    public String getCustomerAddress() {
        return customerAddress;
    }

    public void setCustomerAddress(String customerAddress) {
        this.customerAddress = customerAddress;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getQuantity() {
        return quantity;
    }

    public void setQuantity(String quantity) {
        this.quantity = quantity;
    }

    public String getUnitPrice() {
        return unitPrice;
    }

    public void setUnitPrice(String unitPrice) {
        this.unitPrice = unitPrice;
    }

    public String getTotalPrice() {
        return totalPrice;
    }

    public void setTotalPrice(String totalPrice) {
        this.totalPrice = totalPrice;
    }
}

Dependecy : 

implementation 'com.google.code.gson:gson:2.10.1'