[챕터 2-2-6] 오리엔테이션

결과화면

 

초기화면

 

닉네임 입력

 

가로 방향으로 전환

가로 방향으로 전환되면서 없어진 세로 방향의 데이터를 가지고 온 것을 확인할 수 있다.

 

 

오리엔테이션 (방향 이벤트)

방향에 따라 오리엔테이션 이벤트가 발생하는데 단말의 센서에 의해 발생.

 

세로방향 (기본)

res/layout/activity_main.xml

 

가로방향 (기본)

res/layout-land/activity_main.xml

---

프로젝트명 : MyOrientation

 

 

res/ 디렉토리에서 디렉토리 생성

 

 

Project Files 로 보기

 

layout-land 디렉토리 생성 확인

 

---

layout 의 activity_main.xml 복사해서 

lyaout-land 디렉토리에 복사

 

 

<?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"
    android:background="#2800BCD4"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="가로방향"
        android:textColor="#FF5722"
        android:textSize="50sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

---

MainActivity

package org.minokuma.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        showToToast("onCreate 호출됨");

    }

    

    public void showToToast(String data){
        Toast.makeText(this, "data", Toast.LENGTH_SHORT).show();
    }

}

 

showToToast() 위에서

Alt + Insert 해서 onDestroy() 지정

 

---

 

package org.minokuma.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        showToToast("onCreate 호출됨");

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        showToToast("onDestroy 호출됨");
    }

    public void showToToast(String data){
        Toast.makeText(this, data, Toast.LENGTH_SHORT).show();
    }

}

 

---

 

 

 

---

 

---

MainActivity.java

package org.minokuma.myapplication;

import androidx.appcompat.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 {

    String name;
    EditText editText;

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

        showToToast("onCreate 호출됨");

        editText = findViewById(R.id.editText);
        Button button = findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (editText != null) {
                    name = editText.getText().toString();
                    showToToast("사용자 입력값을 name 변수에 할당함");
                }
            }
        });

    }

    
    
    @Override
    protected void onDestroy() {
        super.onDestroy();

        showToToast("onDestroy 호출됨");
    }

    public void showToToast(String data){
        Toast.makeText(this, data, Toast.LENGTH_SHORT).show();
    }

}

 

showToToast() 위에서 Alt + Insert 후 onSaveInstanceState

 

---

MainActivity.java

package org.minokuma.myapplication;

import androidx.annotation.NonNull;
import androidx.appcompat.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;

public class MainActivity extends AppCompatActivity {

    String name;
    EditText editText;
    TextView textView2;

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

        showToToast("onCreate 호출됨");

        editText = findViewById(R.id.editText);
        textView2 = findViewById(R.id.textView2);
        Button button = findViewById(R.id.button);

        if (button != null) {
            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if (editText != null) {
                        name = editText.getText().toString();
                        showToToast("사용자 입력값을 name 변수에 할당함");
                    }
                }
            });
        }

        if (savedInstanceState != null){
            if (textView2 != null){
                name = savedInstanceState.getString("name");
                textView2.setText(name);

                showToToast("값을 복원했습니다. : " + name);
            }
        }

    }

    @Override
    protected void onSaveInstanceState(@NonNull Bundle outState) {
        super.onSaveInstanceState(outState);

        outState.putString("name", name);

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        showToToast("onDestroy 호출됨");
    }

    public void showToToast(String data){
        Toast.makeText(this, data, Toast.LENGTH_SHORT).show();
    }

}