在android浮动视图中动态更改文本

i am just a beginner in android and i am assigned to create a floating view for our android team project, i have been able to create the service so far and now i am trying to somehow change the image in the floating view to a dynamically changing text but got no idea how can i do it, so if anyone can help me out i would really appreciate it.i am just a beginner in android and i am assign