AlarmManager VS服务的数据库和FTP连接。哪些以及如何使用？

问题描述

我的问题很简单，但可能附带一个复杂的答案。

我在做一个应用程序，（在网站上通过一个PHP脚本）上的在线MySQL数据库检查新的更新。有时，这种更新会告诉它的应用程序下载构成一个FTP服务器。

应用程序应启动时自动打开并检查更新每隔15分钟。

我读过的网页我应该或者使用服务或AlarmManager，但我不知道哪一个更好。

另外，我读了很多的说AlarmManager将唤醒该设备的网页，但我不明白这到底是什么意思，为什么它在一个服务不同。这是否意味着，如果手机处于关机状态，将打开它，或者它会变成在屏幕上？

我只需要手机做任务在后台时，它的上，我并不需要它来打开屏幕或功率器件。

解决方案

这不是一个或。这是一个和。您将需要使用 AlarmManager 来触发要由服务。

所做的工作

这是 AlarmManager _WAKEUP 事件类型（例如， ELAPSED_REALTIME_WAKEUP ）将器件唤醒退出睡眠模式。也就是说，在东西一起像 WakefulBroadcastReceiver 和 IntentService ，可以安排你做你的工作周期，即使设备通常会睡着了（屏幕和CPU处于睡眠状态）。

然后你可以用 AlarmManager 与非 - _WAKEUP 报警类型（例如， ELAPSED_REALTIME ）。我仍然会建议使用 WakefulBroadcastReceiver 和 IntentService ，以确保设备不会在中间入睡你在做什么，因为这可能会导致你的工作问题。

My question is rather simple but might come with a complex answer.

I'm making an App that checks on an online mysql db (via a php script on the website) for new updates. Sometimes this updates will tell the App it has to download form a FTP server.

The App should start on boot and check for updates every 15 minutes.

I've read in the web I should either use a service or a AlarmManager but I don't know which one is better.

Also, I've read a lot of pages that say that AlarmManager will "Wake Up" the device but I've failed to understand what this really means and why it's different in a service. Does this means that if the Phone is turned off it will turn it on or that it will turn on the screen?

I only need the phone to do the task in the background when it's on, I don't need it to turn the screen on or power up the device.

解决方案

It's not an "or". It's an "and". You will need to use AlarmManager to trigger the work to be done by a Service.

An AlarmManager _WAKEUP event type (e.g., ELAPSED_REALTIME_WAKEUP) will wake up the device out of sleep mode. That, in conjunction with something like WakefulBroadcastReceiver and an IntentService, can arrange for you to do your work periodically even though the device would ordinarily be asleep (screen and CPU in a sleep state).

Then you can use AlarmManager with a non-_WAKEUP alarm type (e.g., ELAPSED_REALTIME). I would still recommend using WakefulBroadcastReceiver and an IntentService, to make sure that the device does not fall asleep in the middle of what you are doing, as that may cause problems for your work.

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