Can you upload here a part of your .ino code that sends the data from your BT device?
If you are sending println() then there are better ways of receiving the data.
Look here for answers: FAQ Section: Bluetooth < version 4 (BlueTooth Client) and Arduino
Also, the timer value of your clock may be too long or too short.
Then: GOOD PROGRAMMING PRACTICE:
First, try to display your data in a label or text block, next, if everything is ok, try to find out how ListViews work, then, if you have mastered that, try to combine the two.
If you do not do that, programming will always be like stirring and poking in mud, hoping you will find gold or diamonds. Sometimes you can be lucky.
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