可能重复：
How to draw a path on a map using kml file?
Android draw a path on a mapView from a large amount of longitude/latitude points
在我的Android应用程序中，我在“绘制”Overlay类中使用此方法在地图上绘制路线。
有人可以告诉我这个方法在地图上绘制路线是否合适（在性能方面）还是我必须将代码放在线程中？
我是初学者。
`
public synchronized void draw(Canvas canvas, MapView mapView, boolean shadow) {
if (pointsAndTimes.isEmpty()) {
return;
}
Projection projection = mapView.getProjection();
Paint paint = new Paint();
paint.setARGB(250, 255, 0, 0);
paint.setAntiAlias(true);
paint.setFakeBoldText(true);
paint.setStrokeWidth(4);
paint.setAlpha(100);
for (int i = 0; i < pointsAndTimes.size(); i++) {
PointAndTime pointAndTime = pointsAndTimes.get(i);
Point point = projection.toPixels(pointAndTime.getGeoPoint(), null);
if (i == pointsAndTimes.size() - 1) {
} else {
PointAndTime nextPointAndTime = pointsAndTimes.get(i + 1);
Point nextPoint = projection.toPixels(nextPointAndTime
.getGeoPoint(), null);
canvas.drawLine(point.x, point.y, nextPoint.x, nextPoint.y,
paint);
}
}
mapView.invalidate();
}`
由于