image를 canvas이용해서 그리기

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Rect;
import android.os.Bundle;
import android.view.View;
import android.view.Window;

public class CanvasView extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(new ImageView(this));
    }
    
    public class ImageView extends View{
    	
    	private Bitmap image; // 이미지
    	
    	public ImageView(Context context) {
			super(context);
			setBackgroundColor(Color.WHITE);
			// 그림 읽어들이기 
			Resources r = context.getResources();
			image = BitmapFactory.decodeResource(r, R.drawable.excavator);
    	}

		@Override
		protected void onDraw(Canvas canvas) {
			// 원본이미지
			canvas.drawBitmap(image, 0, 0, null);
			
			// 원본이미지 영역을 축소해서 그리기 
			int w = image.getWidth();
			int h = image.getHeight();
			Rect src = new Rect(0, 0, w, h);
			Rect dst = new Rect(0, 200, w / 2, 200 + h / 2);
			canvas.drawBitmap(image, src, dst, null);
			super.onDraw(canvas);
		}
    }
}