当应用程序在后台运行且没有前台服务时如何检测蓝牙变化(连接状态和特性) [英] How to detect bluetooth changes (connection state and characteristic) when app is in background without a foreground service

问题描述

我有一个设备，它是带有按钮的简单BLE设备，并且我需要检测用户何时长时间按下该设备(通过特性更改)，即使该应用程序在后台.

I have a device that is a simple BLE device with a button, and I need to detect when the user long presses the device (via characteristic change) even when the app is in the background.

此点击将触发服务器的远程呼叫.

This click will trigger a remote call the server.

对此我有两个问题:

#1我可以在没有前台服务的情况下实现此目标吗?

#1 Can I have this achieved without a foreground service?

#2如果我有运行BLE GATT回调的前台服务，如何检测设备何时再次处于范围内?

#2 If I have a foreground service running with the BLE GATT callbacks how can I detect when the device is in range again?

我当前的解决方案是让前台服务始终在后台运行，但与此同时，用户将需要始终显示该应用程序的通知.

My current solution is to have a foreground service always running in the background but with that, the user will need an always showing notification of the app.

推荐答案

1:是的，您可以使用 JobIntentService 来实现此功能而无需使用前台服务.

1: Yes you can achieve this without using a foreground service, by using a JobIntentService.

这种类型的服务不需要向您的用户显示通知.

This type of service does not require to display a notification to your user.

要知道单击设备按钮的时间，您的JobIntentService可以扫描BLE设备，并且可以在设备广告的BLE数据中包括最后单击的标志或时间戳.

To know when the device button has been clicked, your JobIntentService could scan for BLE devices, and you could include in the BLE data advertised by your device a flag or timestamp of the last click.

为了避免耗尽电池电量，建议您不要连续扫描，而应每分钟扫描几秒钟.

In order to avoid draining the battery, I suggest you don't scan continuously, but only for a few seconds every minute.

2:如果您的BLE扫描仪接收到该设备发布的BLE数据，则表明该设备在范围内.

2: If your BLE scanner receives BLE data advertised by the device, it means the device is within range.

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