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    <p>As an example, for converting mass to and from different units, I would go through an intermediate unit.</p> <p>eg. lets say I have the following</p> <pre><code>final int TYPE_KG = 0; final int TYPE_POUNDS = 1; // these two values come from your spinners int sourceUnitType; // eg 0=kg, 1=pounds, ... int destUnitType; // same types as the source unit type </code></pre> <p>Then you can convert the source number into your intermediate units, like kilograms, using a function</p> <pre><code>double convertMassToKg(int sourceUnitType, double source) { switch (sourceUnitType) { case TYPE_KG: return source; case TYPE_POUND: return source * 0.453592; } } </code></pre> <p>then convert the intermediate value into the destination units</p> <pre><code>double convertKgToMass(int destinationUnitType, double kilos) { switch (destinationUnitType) { case TYPE_KG: return kilos; case TYPE_POUND: return kilos / 0.453592; } } </code></pre> <p>That's just my take on the problem anyway. What values can your spinners take? Because it doesn't make sense to let somebody try to convert kilometers to kilograms for example, so depending upon how you have broken up your program (i.e. is this form just for converting mass?) then perhaps you can approach it a little differently.</p> <p>You could let the user select the source type in the first spinner, and then update the second spinner with only those types which make sense, eg if the first spinner is selected to "kilometers" then the second could have the options "miles", "centimeters", "yards", etc.</p>
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    1. USWayne Uroda
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    1. COWell actually what happens is depend on the button the user presses the spinner loads a different set of values, speed, mass, degrees, etc.. and i want the user to be able to convert from one type to another and the opposite as well. Ex: if he selects pounds > he also can be able to convert to miligrams, oz, kg, etc.. there is other options.
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      1. USMarcus Gabilheri
    2. COYep, I understand. What do you think of this idea? I think it has its merits. A lot more typing than @StinePike's answer but perhaps a little more readable. Either way, I think there are some good options :)
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    3. COIf you have 100s of these conversions, that's a lot of code duplication. You can probably combine the 2 functions into 1 by passing in an additional parameter, since the only difference seems to be `*` VS `/`. You can just set a variable in the switch and have the calculations happen after the `switch`.
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