MIDP 2.0 推送注册表
我们希望使用 MIDP2.0 推送注册表定期调用 MIDLet 来检查来自服务器的新消息。如果另一个 MIDLet 已经在前台运行，我们的 MIDLet 是否能够同时被调用？行为是否因设备而异（例如诺基亚 S-60、摩托罗拉、三星、LG）？
We would like to use MIDP2.0 push registry to invoke our MIDLet at regular interval to check for new messages from server. If another MIDLet is already running in the foreground will our MIDLet be able to be invoked simultaneously? Will the behavior vary from device to device (e.g. Nokia S-60, Motorola, Samsung, LG)?
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行为肯定会有所不同。有些设备无法处理多任务（例如诺基亚的 Series 40 设备），并且我非常怀疑当另一个 MIDlet 正在这些设备上运行时，PushRegistry 会调用您的应用程序。实际上，我什至不确定您的 MIDlet 是否会从支持多任务处理的设备（例如 SonyEricsson）上运行的另一个 MIDlet 调用（并且可能会窃取前台）。根据我使用 Java ME 平台的经验，这正是会因设备碎片而受到严重影响的功能。
Behavior will definitely vary. Some devices can't handle multitasking (e.g. Nokia's Series 40 devices) and i highly doubt that your application will be invoked by PushRegistry while another MIDlet is running on those devices. Actually I'm not even sure that your MIDlet will be invoked (and could steal the foreground) from another running MIDlet on devices that do support multitasking (e.g. SonyEricsson). From my experience with the Java ME platform this is exactly the kind of feature that would suffer greatly from device fragmentation.