Optimization 2 -- drawing optimization, optimization 2 -- Drawing

Optimization 2 -- drawing optimization, optimization 2 -- Drawing

The onDraw method of the View needs to avoid executing a large number of operations:

1. Do not create new local objects in onDraw. The onDraw method may be called frequently. This will generate a large number of temporary objects in an instant. Excessive memory usage.

2. Do not perform time-consuming tasks in onDraw. A large number of cycles will cause the View to be not smooth, and the cPu time will be preemptible.

 

According to the message provided by Google, the frame rate is at 60fps, And the draw time of each frame should not exceed