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안드로이드 프로그래밍 제 4장 연습문제 (7, 8, 9번) 본문

Android

안드로이드 프로그래밍 제 4장 연습문제 (7, 8, 9번)

_mojo_ 2021. 8. 26. 17:37

7번 체크박스를 선택할 때마다 버튼의 속성이 설정되도록 프로젝트 작성하기

 

XML Code

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="30dp"
    android:orientation = "vertical">

    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="Enabled 속성"
        android:id="@+id/chk1"/>

    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="Clickable 속성"
        android:id="@+id/chk2"/>

    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="45도 회전"
        android:id="@+id/chk3"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:text="Button"
        android:enabled="false"
        android:clickable="false"
        android:rotation="0"
        android:id="@+id/btn1"/>

</LinearLayout>

 

Java Code

 

package com.example.helloandroid;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.graphics.Color;
import android.graphics.Typeface;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

import org.w3c.dom.Text;

public class MainActivity extends AppCompatActivity {

   CheckBox chk1,chk2,chk3;
   Button btn;

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

        chk1 = (CheckBox)findViewById(R.id.chk1);
        chk2 = (CheckBox)findViewById(R.id.chk2);
        chk3 = (CheckBox)findViewById(R.id.chk3);
        btn = (Button)findViewById(R.id.btn1);

        chk1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                if(chk1.isChecked() == true){
                    btn.setEnabled(true);
                }
                else{
                    btn.setEnabled(false);
                }
            }
        });

        chk2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                if(chk2.isChecked() == true){
                    btn.setClickable(true);
                }
                else{
                    btn.setClickable(false);
                }
            }
        });

        chk3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                if(chk3.isChecked() == true){
                    btn.setRotation(45);
                }
                else{
                    btn.setRotation(0);
                }
            }
        });

    }
}

 

 

 

8번 EditText 키가 눌릴 때마다 바뀐 글자가 토스트 메시지로 나오도록 프로젝트 작성하기

 

XML Code

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="30dp"
    android:orientation = "vertical">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="입력하세요."
        android:id="@+id/edit1"/>

</LinearLayout>

 

Java Code

 

package com.example.helloandroid;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.graphics.Color;
import android.graphics.Typeface;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

import org.w3c.dom.Text;

public class MainActivity extends AppCompatActivity {

    EditText edit;

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

        edit = (EditText)findViewById(R.id.edit1);
        edit.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View view, int i, KeyEvent keyEvent) {
                String s = edit.getText().toString();
                Toast.makeText(getApplicationContext(),s,Toast.LENGTH_SHORT).show();
                return true;
            }
        });

    }
}

 

 

 

 

9번 버튼을 클릭하면 이미지가 10도씩 회전하도록 프로젝트를 작성하기

 

XML Code

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="30dp"
    android:orientation = "vertical">

    <ImageButton
        android:layout_width="300dp"
        android:layout_height="100dp"
        android:src="@drawable/rabbit"
        android:id="@+id/imgBtn1"
        android:layout_margin="30dp"
        android:scaleType="fitCenter"/>

    <ImageView
        android:layout_width="300dp"
        android:layout_height="300dp"
        android:layout_margin="30dp"
        android:rotation="0"
        android:src="@drawable/oreo"
        android:id="@+id/img1"
        android:scaleType="fitCenter"/>

</LinearLayout>

 

Java Code

 

package com.example.helloandroid;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.graphics.Color;
import android.graphics.Typeface;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

import org.w3c.dom.Text;

public class MainActivity extends AppCompatActivity {

    ImageButton imgBtn;
    ImageView imgView;

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

        imgBtn = (ImageButton)findViewById(R.id.imgBtn1);
        imgView = (ImageView)findViewById(R.id.img1);

        imgBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int rotate = (int)imgView.getRotation();
                imgView.setRotation((rotate+10) % 360);
            }
        });

    }
}

 

 

 

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