平局正在不断呼吁在我的Andr​​oid地图叠加 [英] draw is being constantly called in my android map overlay

问题描述

我想画一个路线到我的图形页面。 我一直延伸覆盖和实现的draw（）方法。 这条路线是正确显示，虽然在调试， 我加的平局（）断点，发现它被称为不断。

I'm trying to draw a route onto my MapView. I've extended Overlay and implemented the draw() method. The route is displayed properly, although while debugging, I added a breakpoint on draw(), and noticed it is being called constantly.

我只希望它被重新绘制，如果有人移动地图或缩放（绘制路线抽签时考虑到这些变化） 是什么原因？

I only want it to be re-drawn if someone moves the map or zooms (the draw take into account these changes when drawing the route) What can cause this ?

推荐答案

有可以覆盖两队战平的方法。

There are two draw methods that can be overridden.

void draw(android.graphics.Canvas canvas, MapView mapView, boolean shadow)

说明：绘制叠加在地图

Desc: Draw the overlay over the map.

布尔平局（android.graphics.Canvas帆布，图形页面图形页面，布尔影子，时长）
说明：绘制呼吁动画叠加

boolean draw(android.graphics.Canvas canvas, MapView mapView, boolean shadow, long when)
Desc: Draw call for animated overlays.

我本来overrided第二个。
改变为第一方法后，它的工作

I originally overrided the second one.
After changing to the first method, it worked out.

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