It's hard to go to work today, summarize the experience in the recent work. First, when switching Canvas, release the resource. To shield your Command, KeyPress, that is, after pressing Command or KeyPress, it is then shielded. Avoid pressing the button or the continuous button appears in NullPoint Exception. Second, if the phone's memory allows, try to load all resources when the program starts, so on the one hand, it can increase the fluency of the program run, and the other hand can avoid resource continuous release, create a memory garbage fragment. There are insufficient resources in the event. Third, you can consider only a Canvas object when you think about it. Fourth, when writing code (1) Try to Note Details (2) Code Structure Clear (3) Document - 15:33
