view.ondraw

@Override

protected void onDraw(Canvas canvas) {

// TODO Auto-generated method stub

super.onDraw(canvas);

canvas.drawColor(Color.WHITE);       //设置画布颜色

paint.setColor(Color.BLACK);                    //设置画笔颜色  ,画笔颜色必须用的是graphyis;

paint.setStrokeWidth((float) 5.0);   //设置画笔颜色宽度

paint.setAntiAlias(true);   //设置不带锯齿

float startx=0,starty=0,stopx,stopy;

canvas.drawLine(startx, starty, stopx, stopy, paint);//画线

}