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Thanks, you are correct, one has to 'roll his own'
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Thanks, you are correct, one has to 'roll his own'

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I have a 'trick' that I do sometimes in Java/Swing in which I create a swing component that is always invisible and it may have any number of event listeners attached to it. When a variable or variables changes value, the code will cause that component to change and anything listening will know that those variable(s) have change. <br />
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I want to do this same thing in Android. What would I use instead of the swing component?
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I have a 'trick' that I do sometimes in Java/Swing in which I create a swing component that is always invisible and it may have any number of event listeners attached to it. When a variable or variables changes value, the code will cause that component to change and anything listening will know that those variable(s) have change. 

I want to do this same thing in Android. What would I use instead of the swing component?

Android component listener

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.

Java

Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. Android's user interface is based on direct manipulation, using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a virtual keyboard for text input. In addition to touchscreen devices, variants of Android are also used on notebooks, game consoles, digital cameras, televisions, automobiles and other electronics. Applications are usually developed in Java programming language using the Android software development kit (SDK), but other development environments are also available, including Delphi, Ruby and Visual Studio (using C++).