카메라 프리뷰에 문자와 선 넣기 & 터치 이벤트

** MainActivity Class

  public void onCreate(Bundle savedInstanceState) { 

        super.onCreate(savedInstanceState); 

        

    DrawOnTop mDraw = new DrawOnTop(this); 

setContentView(R.layout.activity_camera_preview);
addContentView(mDraw, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

        

    }

} 

** DrawOnTop Class

class DrawOnTop extends View {

    public Vertex pt2 = new Vertex( 300, 690, true, 0);

    public DrawOnTop(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        // TODO Auto-generated method stub

        Log.d("DrawOnTop", "onDraw");

        Paint paint = new Paint();
        paint.setStyle(Paint.Style.FILL);
        paint.setColor(Color.RED); // 적색
        paint.setStrokeWidth(10);
        paint.setTextSize(100);// 크기 10
        canvas.drawText("Test Text", 100, 100, paint); // 텍스트 표시


        // w: 1920, h: 1080
        //canvas.drawLine(0, 960, 0, 0, paint);    // 라인그리기
        int nCy = canvas.getHeight()/2;
        int nCx = canvas.getWidth()/2;
        canvas.drawLine(nCx, nCy, pt2.x, pt2.y, paint);    // 라인그리기

        super.onDraw(canvas);
    }

 public boolean onTouchEvent(MotionEvent event)
    {
        Log.d("DrawOnTop", "onTouchEvent");

        if (event.getAction() == MotionEvent.ACTION_DOWN)
        {
            pt2.x = event.getX();
            pt2.y = event.getY();
            invalidate();
            return true;
        }

        if (event.getAction() == MotionEvent.ACTION_MOVE)
        {
            pt2.x = event.getX();
            pt2.y = event.getY();
            invalidate();//화면에 그림을 그림 -> onDraw()실행함.
            return true;
        }

        return false;
    }
    //*/

}