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Thread: Single Instances of Activities

  1. July 26th, 2014, 10:45 AM #1
    aussiemcgr
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    Default Single Instances of Activities

    I have a very specific program flow for my activities. There are two flows, which look like this:
    Flow 1)
    Main Activity - contains button to take you to the New Puzzle activity
    New Puzzle Activity - contains configuration information for the puzzle and a button which takes you to the Puzzle activity
    Puzzle Activity - simply contains an interactive puzzle, contains options menu item to bring you to the New Puzzle Activity
    Flow 2)
    Main Activity - contains button to load a previously saved puzzle and takes you to the Puzzle Activity
    Puzzle Activity - simply contains an interactive puzzle, contains options menu item to bring you to the New Puzzle Activity

    Only one puzzle can exist in memory at any given time, which means I would like to restrict the number of allowed Puzzle Activities in the stack to 1. This means I would also like to restrict the number of New Puzzle Activities in the stack to 1, since there would be no purpose to having 2 or more.

    I did a bit of research and came across the android:launchMode="singleTask" and "singleInstance", but the Android Developer guide warns "not recommended for general use" (<activity> | Android Developers).

    Would using these launch modes do what I want and would it be an ok thing to use, or is there a better way to do this?
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  3. July 28th, 2014, 09:00 AM #2
    ChristopherLowe
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    Default Re: Single Instances of Activities

    I think what you are looking for is an Intent with the flag FLAG_ACTIVITY_REORDER_TO_FRONT

    Intent openPuzzelActivity = new Intent(PuzzelActivity.this, Main.class);
openPuzzelActivity.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(openPuzzelActivity);


    From the docs:
    FLAG_ACTIVITY_REORDER_TO_FRONT - If set in an Intent passed to Context.startActivity(), this flag will cause the launched activity to be brought to the front of its task's history stack if it is already running.
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