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    <p>I have recently created an Android application that communicates to a hardware device over Bluetooth. In my application, I have many Activity classes that communicate through the connection, and the application also performs continuous data logging from the connection in the background, too. Therefore, hopefully I might be able to help here. (This is my first attempt at posting an answer on StackOverflow, so go easy on me.)</p> <p>In my application, I have first of all put all of the Bluetooth code into a separate dedicated class file (which I call BluetoothIF.java). The constructor in this class performs basic adapter initialization, and further methods are provided for tasks like making connections, etc. It contains the Runnable classes for establishing a connection and then transmitting / receiving over the established connection. (Essentially it is based upon the BluetoothChat example.)</p> <p>I don’t need to perform a massive amount of communication over the Bluetooth connection, and I also needed to have a Service in the background to continuously monitor and log data from the connection as previously mentioned. So, I instantiated my BluetoothIF within the Service. Any Activity classes that need to exchange data over the existing Bluetooth connection do so in my application by exchanging messages with the Service.</p> <p>Alternatively, if you have no need for using a Service, perhaps you should share the Bluetooth object instance across Activitys using the singleton model or by extending the Application class. </p>
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    1. CONo need to go easy on a good answer :)
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