[How-to] change bootscreen on Android

Source

1. Connect your Android device to your computer, it doesn’t matter what you choose, but choose USB drive.
   
   
2. Great! Now that it’s connected to your computer, go over to Settings>Applications>Development, and check that “USB Debugging” box.
   
   

2b. Now remember, with that setting on, anything that goes through your phone won’t warn you, so this can be bad and be used maliciously. I warned you!

1. On your computer, download a custom boot animation (it might come with audio), and make sure there are two files: background.zip (animation) and android_audio.mp3 (optional, audio). Drag those files (Do NOT unzip background.zip) onto the tools folder of your SDK (…/tools).
   
   
2. Good, good… now, here comes the tricky part, make no mistake and make sure your background works. Open up command prompt (Start>Run “cmd” or on the tools folder, hold shift and right-click, then choose open Command Prompt window here) and type in the following codes:
   
   cd [location of sdk]\tools
   (note: where it says “[location of sdk]” it’s where the SDK is, e.g. “C:\android-sdk-windows\tools”)
   
   adb devices
   (check to see if your device is there)
   
   adb push background.zip /data/local
   
   adb push android_audio.mp3 /data/local
   (if you have audio on the background)
   
   adb shell reboot
   (reboots the phone)

Picture :D

1. Congratulations, you have changed your boot animation, remember to disable USB Debugging!
   Look at the Before and Afters below:

Before (VZW boot screen on Droid Incredible):

After (Droid X boot screen, with the DRRROOOIIIIDDD sound :P):






other example from here