This is a simple java app that allows you to convert degree Celsius to degree Fahrenheight or from degree Fahrenheight to degree Celsius with a simply click.
Just download the attached apk (zipped up) and make sure you have Java installed. Then unzip the file and double click to launch. Once the app launches select which conversion you want to see. Then just put in the number and click the 'Convert' button to see the results. Afterwards, just click the 'Clear' button to put in another entry or just click the 'Exit' button to exit the app. Note app is not resizable.
Attached apk file tested on Mac OS X and Windows OS PC. Screen Caps shown below taken from Mac OS X.