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黑莓：拨轮定格侦听器

[英]Blackberry: trackwheel stop motion listener

原文 2011-03-15 16:19:54 9 1 java/ blackberry/ map/ listener/ trackball

I'm implementing an app that has a MapField , which I am extending. 我正在实现一个具有MapField的应用程序，该应用程序正在扩展。

I'm using navigationMovement(int dx, int dy, int status, int time) to move around this map (besides touchEvent(TouchEvent event) which i dont have a problem with). 我正在使用navigationMovement(int dx, int dy, int status, int time)在此地图上移动（除了touchEvent(TouchEvent event) ，我没有问题）。

The problem is that I want to do something when the user stops moving using the trackwheel , but I can't find a listener for this like the TouchEvent.UP for example. 问题是，我想，当用户停止使用移动做一些事情trackwheel ，但我不能找到一个listener喜欢这个TouchEvent.UP的例子。

Does anyone have an idea of what I can use to detect this? 有人知道我可以用来检测到什么吗？

Thanks in advance! 提前致谢！

1 个解决方案

I'm not (yet) that familiar with BlackBerry-programming, but I don't remember seeing a listener for that anywhere. 我还不熟悉BlackBerry编程，但是我不记得在任何地方都可以看到它的监听器。

One way I could think of to accomplish this could be to create a TimerTask , and store a timestamp in some class-variable when the TrackWheel moves (when your navigationMovement is called). 我可以想到的一种方法是创建一个TimerTask ，并在TrackWheel移动时（在调用navigationMovement时）将时间戳存储在某个类变量中。 Then in the navigationMovement, set the timestamp when the movement occurred (from the time-parameter passed to the method), and start a TimerTask which would then check after a while if the timestamp is marked a certain amount of time back (the wheel has not moved since), and if so, you know the trackwheel has stopped. 然后在navigationMovement中，设置发生移动时的时间戳（从传递给方法的时间参数中），并启动TimerTask，该任务将在一段时间后检查时间戳是否标记了一定的时间（车轮已经自此之后没有移动），如果是这样，则说明拨轮已停止。