[Android Studio] Custom View

기본적으로 존재하는 뷰 외에도 사용자가 직접 View Class를 상속받아서 개발자 임의로 View를 만들어 사용할 수 있다.

package com.example.windows7.myapplication;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

/**
 * Created by WINDOWS7 on 2018-01-16.
 */

public class CustomView extends View {
    private Paint paint= null;
    public CustomView(Context context){
        super(context);
    }

    //화면에 뷰가 표시될 때 호출되는 method
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        // 붉은색으로 전부 칠해진 정사각형
        paint= new Paint();
        paint.setColor(Color.RED);
        canvas.drawRect(100, 100, 200, 200, paint);

        // 붉은색으로 테두리만 칠해진 정사각형
        paint= new Paint();
        paint.setStyle(Paint.Style.STROKE);
        paint.setColor(Color.RED);
        paint.setStrokeWidth(2);
        canvas.drawRect(200, 100, 300, 200, paint);

        // 투명도가 약 0.5인 파란색 정사각형
        paint= new Paint();
        paint.setARGB(128, 0,0,255);
        paint.setStyle(Paint.Style.FILL);
        canvas.drawRect(100, 200, 200, 300, paint);
        
        //테두리가 점선으로 된 초록색 정사각형
        paint= new Paint();
        DashPathEffect dashPathEffect= new DashPathEffect(new float[]{5,5}, 1);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeWidth(3.0F);
        paint.setPathEffect(dashPathEffect);
        paint.setColor(Color.GREEN);
        canvas.drawRect(200, 200, 300, 300, paint);
        
        //텍스트
        paint= new Paint();
        paint.setColor(Color.MAGENTA);
        paint.setStrokeWidth(1);
        paint.setTextSize(30);

        canvas.drawText("No AntiAlias", 400, 300, paint);
        paint.setAntiAlias(true);
        canvas.drawText("Ok AntiAlias", 400, 400, paint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if(event.getAction()== MotionEvent.ACTION_DOWN){
            Toast.makeText(super.getContext(), "X: "+ event.getX()+ ", Y:"+ event.getY(), Toast.LENGTH_LONG).show();
        }

        return super.onTouchEvent(event);
    }
}

작성중