Accessing a Bluetooth “ConnectedThread” from various activities

问题

I have created a BluetoothManager much like the one in this example. This object is instantiated in a connection activity, reached from the main acitivty by clicking on a "Connect" button, which provides a ListView of selectable devices. Works great so far.

I am now connected and have a BluetoothManager.ConnectedThread running and the streams set up. I would now like to be able to send Bluetooth data from/to various other activities when they are running. For example, I will want to chart realtime values when the charting activity is running.

As far as I can tell, the pushing of the data out from the ConnectedThread will occur via a Handler, which is a new topic for me. What I am unclear on his how other activities might access the ConnectedThread's write() function.

回答1:

First of all, even though a singleton could be a solution, android Service's are there for this purpose, since these are elements that can keep running when your UI is out. So my suggestion would be to create a sticky service an then you have two options:

• Handle data using a handler between the activity and the Service. Maybe if you are not too familiar with the Handler api this will take some time to you. In this example of the official documentation you can also check how to use the handler.
• Create a bound service, to which you can bind from the activities and send some data when required. Here you have the official information about bound services.

You can have a look to this tutorial to get more information about handlers.

来源：https://stackoverflow.com/questions/39475773/accessing-a-bluetooth-connectedthread-from-various-activities