自定义画圆

package com.example.drawcircle;


import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;


public class DrawCircle extends View{

float x = 40;
float y = 50;
Paint paint = new Paint();


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


public DrawCircle(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}


public DrawCircle(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);

paint.setColor(Color.RED);
canvas.drawCircle(x, y, 20, paint);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
x = event.getX();
y = event.getY();

invalidate();
return true;
}


}