# 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;
}
}
}
```
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