Paracelable 다른 참고 자료

activity_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".MenuActivity">

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="120dp"
        android:text="돌아가기"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.49"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="132dp"
        android:text="전달받은 데이터"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

 

 

 

 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="260dp"
        android:text="메뉴 화면 띄우기"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

 

 

 

 

SimpleData.java

package com.example.a25_sampleparacelable;

import android.os.Parcel;
import android.os.Parcelable;

public class SimpleData implements Parcelable {
    int number;
    String message;


    protected SimpleData(Parcel in) {
        number = in.readInt();
        message = in.readString();
    }

    public SimpleData(int num, String msg) {
        number = num;
        message = msg;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(number);
        dest.writeString(message);
    }

    @Override
    public int describeContents() {
        return 0;
    }

    public static final Creator<SimpleData> CREATOR = new Creator<SimpleData>() {
        @Override
        public SimpleData createFromParcel(Parcel in) {
            return new SimpleData(in);
        }

        @Override
        public SimpleData[] newArray(int size) {
            return new SimpleData[size];
        }
    };
}

 

 

 

 

MainActivity

package com.example.a25_sampleparacelable;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    public static final int request_code_menu = 101;
    public static final String key_simple_data = "data";

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

        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getApplicationContext(), MenuActivity.class);
                SimpleData data = new SimpleData(100, "Data Something");
                intent.putExtra(key_simple_data, data);
                startActivityForResult(intent, request_code_menu);
            }
        });
    }
}

 

 

 

MenuActivity

package com.example.a25_sampleparacelable;

import androidx.appcompat.app.AppCompatActivity;

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

public class MenuActivity extends AppCompatActivity {
    TextView textView;

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

        textView = findViewById(R.id.textView);
        Button button = findViewById(R.id.button2);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });

//        메인액티비티로부터 전달 받은 인텐트 객체를 참조하기 위해 getIntent 메소드 사용
//        getIntent 메소드를 사용하면, 인텐트 객체가 반환되므로 이 객체 안의 번들 객체를 참조할 수 있다
        Intent intent = getIntent();
        processIntent(intent);
    }

    private void processIntent(Intent intent) {
        if (intent != null) {
            Bundle bundle = intent.getExtras();
            SimpleData data = bundle.getParcelable(MainActivity.key_simple_data);

            textView.setText("전달 받은 데이터\nNumber : " + data.number + "\nMessage" + data.message);
        }
    }
}