[Android] 버튼 이벤트 구현해보기 3

| 어플 종료

 

| Activity_main.xml

<Button
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/b3"
        android:textSize="10pt" 
/>

 

| MainActivity.java

package com.example.aro;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
    TextView tv;
    ImageView iv;
    Button bt1, bt2, bt3;
    int my[]={R.drawable.apple, R.drawable.banana, R.drawable.melon};
    int cnt = 0;

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

        bt1 = this.findViewById(R.id.button1);
        bt2 = this.findViewById(R.id.button2);
        bt3 = this.findViewById(R.id.button3);
        iv = this.findViewById(R.id.myImg);

        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                iv.setImageResource(my[cnt]);
                cnt++;
                if(cnt==3) {cnt=0;
                    Toast.makeText(
                            MainActivity.this,
                            "3번째 그림",
                            Toast.LENGTH_LONG).show();
                }
            }
        });

        bt2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //two.java 문서로 이동
                //Intent it = new Intent(현재클래스, 이동할클래스);
                //Intent it = new Intent(MainActivity.this, two.class);
                Intent it = new Intent(getApplication(), two.class);
                it.putExtra("LG","cake");
                startActivity(it);
            }
        });

        bt3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String info = "어플을 종료합니다.";
                //구글 안드로이드앱에서는 클래스 이름들이 대부분 디저트 이름이다
                //확인버튼 없는 간단한 알림창
                //Toast tt = Toast.makeText(MainActivity.this, info, Toast.LENGTH_LONG); tt.show();
                Toast.makeText(MainActivity.this, info, Toast.LENGTH_LONG).show();
                finish(); //현재 Activity 창 닫기
            }
        });
    }//onCreate end
}//class end