안드로이드 프로그래밍 4장 연습문제7 (안드로이드 예제)

main.java

package com.cookandroid.ex4_789;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;

public class MainActivity extends AppCompatActivity {

    CheckBox chb1,chb2,chb3;
    Button btn1;

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

        setTitle("연습문제 4-7");

        chb1 = (CheckBox) findViewById(R.id.checkBox);
        chb2 = (CheckBox) findViewById(R.id.checkBox2);
        chb3 = (CheckBox) findViewById(R.id.checkBox3);

        btn1 = (Button) findViewById(R.id.button1);

        chb1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {

                if (chb1.isChecked() == true)
                {
                    btn1.setEnabled(true);
                }
                else
                {
                    btn1.setEnabled(false);
                }
            }
        });

        chb2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {

                if (chb2.isChecked() == true)
                {
                    btn1.setClickable(true);
                }
                else
                {
                    btn1.setClickable(false);
                }
            }
        });

        chb3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {

                if(chb3.isChecked()==true)
                {
                    btn1.setRotation(45);
                }
                else
                {
                    btn1.setRotation(0);
                }

            }
        });



    }
}

main.xml

<?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"
    >


    <CheckBox
        android:id="@+id/checkBox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Enabled속성" />


    <CheckBox
        android:id="@+id/checkBox2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Clickable속성" />

    <CheckBox
        android:id="@+id/checkBox3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="45도회전" />

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="110dp"
        android:clickable="false"
        android:enabled="false"
        android:text="Button" />

</LinearLayout>

4장 연습문제7