Android - Event

# Android - Event ```java package exam.Input; import java.util.*; import android.app.*; import android.content.*; import android.graphics.*; import android.os.*; import android.view.*; public class FreeLine extends Activity { private MyView vw; ArrayList arVertex; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); vw = new MyView(this); setContentView(vw); arVertex = new ArrayList(); } // 정점 하나에 대한 정보를 가지는 클래스 public class Vertex { Vertex(float ax, float ay, boolean ad) { x = ax; y = ay; Draw = ad; } float x; float y; boolean Draw; } protected class MyView extends View { Paint mPaint; public MyView(Context context) { super(context); // Paint 객체 미리 초기화 mPaint = new Paint(); mPaint.setColor(Color.BLACK); mPaint.setStrokeWidth(3); mPaint.setAntiAlias(true); } public void onDraw(Canvas canvas) { canvas.drawColor(0xffe0e0e0); // 정점을 순회하면서 선분으로 잇는다. for (int i=0;i< arVertex.size();i++) { if (arVertex.get(i).Draw) { canvas.drawLine(arVertex.get(i-1).x, arVertex.get(i-1).y, arVertex.get(i).x, arVertex.get(i).y, mPaint); } } } // 터치 이동시마다 정점들을 추가한다. public boolean onTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { arVertex.add(new Vertex(event.getX(), event.getY(), false)); return true; } if (event.getAction() == MotionEvent.ACTION_MOVE) { arVertex.add(new Vertex(event.getX(), event.getY(), true)); invalidate(); return true; } return false; } } } ```