[Android Learning note] Double-buffered drawing technology

Double-buffered technical drawing:

What happens when a double buffering technique is generated?
When the amount of data is large, the drawing may take a long time, so the screen will be stuck, flashing and so on.

What is dual buffering technology?
Double buffering is the creation of an object in memory that is consistent with the screen drawing area, drawing the graphic into the object in memory first
, and then copy the graphic on the object to the screen at once.
The process is as follows:
1. Create a buffer that is consistent with the canvas in memory
2. Draw in Buffer
3. Copy the buffer bitmap to the current canvas
4. Releasing buffer memory

In Android development, Surfaceview is the dual-buffering technology that enables the view