所以我试图制作一个在 touchevent 发生时绘制圆圈流的 android 应用程序。如果我在屏幕左侧绘制它应该绘制一个绿色圆圈,如果它在右侧,它应该绘制一个蓝色圆圈。该应用程序正在执行此操作,但它会更改已绘制的所有圆圈的颜色。所以我制作了一个 Draw circle Class 和一个对象数组列表,将每个 cricle 视为一个单独的对象,即使在 Touchup 事件之后仍然无法工作。它的代码如下
private class Drawcirlce {
public Drawcirlce(Canvas c) {
// TODO Auto-generated constructor stub
for (Point point : points) {
if(flag==true)
c.drawCircle(point.x, point.y, 5, paint);
else
c.drawCircle(point.x, point.y, 5, p2);
}
invalidate();
}
/*for (Point point : points) {
if(flag==true)
mcan.drawCircle(point.x, point.y, 5, paint);
else
mcan.drawCircle(point.x, point.y, 5, p2);
}*/
}
public void onDraw(Canvas canvas) {
i++;
//Drawcirlce d=new Drawcirlce();
dc.add(new Drawcirlce(canvas));
Log.d(TAG, "i: " + i);invalidate();
}
public boolean onTouch(View view, MotionEvent event) {
// if(event.getAction() != MotionEvent.ACTION_DOWN)
// return super.onTouchEvent(event);
Point point = new Point();
point.x = event.getX();
point.y = event.getY();
if(point.x>200){
paint.setColor(Color.BLUE);
flag=true;
}
else{
p2.setColor(Color.GREEN);
flag=false;
}
points.add(point);
//dc.add(new Drawcirlce(mcan));
invalidate();
Log.d(TAG, "point: " + point);
return true;
}
public boolean onTouch(View view, MotionEvent event) {
// if(event.getAction() != MotionEvent.ACTION_DOWN)
// return super.onTouchEvent(event);
Point point = new Point();
point.x = event.getX();
point.y = event.getY();
if(point.x>200){
paint.setColor(Color.BLUE);
flag=true;
}
else{
p2.setColor(Color.GREEN);
flag=false;
}
points.add(point);
//dc.add(new Drawcirlce(mcan));
invalidate();
Log.d(TAG, "point: " + point);
return true;
}
任何人都知道我做错了,或者是否有办法解决这个问题?