가수 그룹 관리 DB만들기 더보기 DB browser 다운로드. 레이아웃 package com.example.test27; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import android.content.Context; import android.database.Cursor; import android.database.DatabaseErrorHandler; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.os.Bundle; import andr..

액티비티를 사용한 선호도 투표. 더보기 import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.BlurMaskFilter; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.EmbossMaskFilter; import andro..

간단 그림판 ver2. 더보기 import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import java.util.ArrayList; i..

viewpager2활용 더보기 위 클래스랑 layout resource 파일생성 package com.example.test19; public class DataPage { int color; String title; public int getColor() { return color; } public void setColor(int color) { this.color = color; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public DataPage(int color, String title) { this.color = color; this.title = ti..

inputstream,outputstream 연습 package com.example.test19; import androidx.appcompat.app.AppCompatActivity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; public class MainAc..

자바 코드로 메뉴 만들어 보기 import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import androidx.constraintlayout.widget.ConstraintLayout; import android.graphics.Color; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.SubMenu; import android.widget.Button; public class MainActivity extends AppCompatActivity { Button bt1; ..