Split string into array

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string

Hello! Im programming an Android app (java). I have estabilished a wifi connection and im reading data from humidity sensor. I got 20 measures in 10 seconds. Now i want to graph this data.
So i have a string of data (humidity measuring), like this : 50.2050.2050.2550.3050.30, and so on... For graph i need an array, so i need to split every fifth character of the string, so i would get something like this: [50.20, 50.20, 50.25, 50.30, 50.30, ...]

Thank you for your help!