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I am creating a UDP messaging system for Android application. For that I have created a seperate class with sending, receiving, parsing threads. The class has to be instanciated only one - ie. only one UDP server!

Now, in Android you have multiple activities in your design which are basically different classes. I would like to use my UDP communication iterface from those different classes. But currently UDP CI is instanciated once in the main class. Therefor I cannot access the object from different classes. Moreover, the CI parse module will have to change settings/UI/... of the whole app depending on the message.

Therefore:

  1. Do I need to have instantiation at all if I do not need more than 1 object?
  2. Is it a good choice to have everything in the class static?
  3. At some point I will need to talk the other way round (obj->main). Should I use callbacks or just pass necessary resources from main to the CI and do things with them in CI?

I hope I described the problem clear enough. Please ask me if any questions arise.

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3 Answers 3

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Either store it in Application Context (which is a singleton). Or do the connection in Service and let each Activity retrieve data if they want.

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It seems like that your different classes need an instance of Or formally speaking have a dependency on UDP Cl. To address this, we have two options -

  • use a dependency injection framework e.g. guice to inject such dependencies automatically in different classes
  • Old school way - Create a singleton for UDP Cl and all the classes which need UDP Cl can do something like UDBCl.getInstance() to get instance of UDP Cl

I personally prefer method 1 because that is unit test friendly. Method 2 will be quicker to solve your problem

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Could you please what is dependency a injective framework and how does it work? Any short example?
Please take a look at code.google.com/p/google-guice/wiki/Motivation (its gives a great background on how dependency injection helps and how to use it)
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Create an instance of the first class in the second class.. Also, you can use bundles to transfer data between classes.

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Data must be serializable for bundles. And I need to minimize object instantiation to minimize memory usage.

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