Android Bootup Logo and Animation

Vanilla Android boots up with a Green Droid logo and then switch to boot animation.

Droid logo image is loaded by init process(system/core/init/init.*)

main()
--> console_init_action()
      --> load_565rle_image(INIT_IMAGE_FILE)

Where INIT_IMAGE_FILE="/initlogo.rle"

Image load processing is handled by system/core/init/logo.c

Android boot animation is triggered by SurfaceFlinger startup routine(frameworks/base/services/surfaceflinger/SurfaceFlinger.cpp)

SurfaceFlinger::readyToRun()
--> property_set("ctl.start", "bootanim")

Where bootanim service(defined in /init.rc) will start /system/bin/bootanimation

Bootanimation code can be found here frameworks/base/cmds/bootanimation/*

Now you know what you need to modify to create a custom Android bootup Logo or Animation.