[alok9shm]

@dmaxx did you read this?
I hope it answers your query.

Spoiler:

can you please tell me just, which resolution gif must be?

You don't need to worry about the resolution. Use the resolution of your device screen.

or you can specify the resolution in the desc.txt file [descriptor file that stores the resolution/size/framerate/no. of loops etc]

An example of desc.txt file:

480 640 30
p 1 0 part0
p 0 10 part1

Line 1: stores the current resolution of the animation 480x640 [you can change it to you screen size without modifying the original res of the gif] 30 is the framerate

Line 2: ignore the p. 1 -> the images in folder part0 is looped 1 time. change it to 0 for Infinite loop. The next 0 means the pause time after a single loop. then part0 -> the name of folder containing frame images.

Line 3: same as above [as there are 2 folders here - part1 and part 2]

Hope you got it.

There are many 3rd party apps that will take the gif as input and give you the bootanimation.zip file as output. You can try them if you don't want to get your hands dirty.

But I'll suggest you to make one yourself. I made the above file without any tool. I used the gif created by @bluedog.tar.gz and took screenshots of every frame and then putting the images in folders to create the zip.

For any help, remember me.