Detailed Explanation of Android 12 Boot Animation Code and Process

1 year ago
Liam
2 minutes

The boot animation of Android 12 is achieved using system properties and the init process. Below is a detailed explanation of the code and process of Android 12 boot animation.

  1. The configuration file for the system, located at /system/build.prop.
# 开机动画控制属性
persist.sys.bootanimation.enable=1
persist.sys.bootanimation.name=bootanimation.zip
  1. The persist.sys.bootanimation.enable property is used to enable or disable the boot animation. Setting it to 1 enables the animation, while setting it to 0 disables it.
  2. The persist.sys.bootanimation.name property specifies the name of the boot animation file.
  1. init.rc is the initial script file for the Android operating system.
on property:persist.sys.bootanimation.enable=1
    start bootanim

When the value of the persist.sys.bootanimation.enable property is set to 1, the init process will start a service named bootanim.

  1. start-up configuration file
service bootanim /system/bin/bootanimation
    class core
    user graphics
    group graphics
    disabled
    oneshot

This code segment defines a service named bootanim, which starts the boot animation using the /system/bin/bootanimation executable file.

  1. The implementation of the boot animation: The boot animation file bootanimation.zip is a compressed file that contains a series of image files and description files. The main logic of the boot animation implementation is in the /system/bin/bootanimation file.
  2. Analyze the boot animation file: the /system/bin/bootanimation file will read the bootanimation.zip file, parse the description file desc.txt within it, and extract information such as the frame rate and interval of the boot animation.
  3. Playing the boot animation: The /system/bin/bootanimation file will sequentially display the image files in bootanimation.zip according to the frame rate and frame interval to achieve the animation effect.

The above provides a detailed explanation of the code and process of the Android 12 boot animation. Developers can customize the implementation logic and effects of the boot animation according to their own needs.

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