버튼을 눌러 LinearLayout의 orientation 바꾸기

Chap5. 인터페이스 기초02 - 레이아웃(Layout)
패키지명 : Exam01

• vertical 버튼 생성
  id : btnVertical
  onClick : onClick
  text : @string/v_btn

• horizontal 버튼 생성
  id : btnHorizontal
  onClick : onClick
  text : @string/h_btn

• 기본 레이아웃이 Constraint인 경우 Linear로 바꿔주기

onClick 메소드

public void onClick (View v) {
        switch (v.getId()) {
            case R.id.btnVertical:
                layout.setOrientation(LinearLayout.VERTICAL);
                break;

            case R.id.btnHorizontal:
                layout.setOrientation(LinearLayout.HORIZONTAL);
                break;
        }
}

LinearLayout layout = findViewById(R.id.linearLayout);
: onClick에서 실행하면 버튼을 누를 때마다 실행되므로 onCreate에서 실행한다.

• 실행 결과
  

전체 코드

• MainActivity.java

package ddwucom.mobile.test04;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {

    final static String TAG = "MainActivity";
    LinearLayout layout;

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

        layout = findViewById(R.id.linearLayout);
    }

    public void onClick (View v) {
        switch (v.getId()) {
            case R.id.btnVertical:
                layout.setOrientation(LinearLayout.VERTICAL);
                break;

            case R.id.btnHorizontal:
                layout.setOrientation(LinearLayout.HORIZONTAL);
                break;
        }
    }
}

• activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/btnVertical"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="@string/v_btn" />

    <Button
        android:id="@+id/btnHorizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="@string/h_btn" />
</LinearLayout>

• string.xml

<resources>
    <string name="app_name">Exam01</string>
    <string name="v_btn">VERTICAL</string>
    <string name="h_btn">HORIZONTAL</string>
</resources>