[Android] Rename Package in Eclipse

Changing package name is pain and may occur errors especially submit App and get the same package name feedback. I try several methods and found the way is easily.

1. Right click on the package name then Refractor > Rename.
    There may be many package name needed to change and should check all.
2. Right click on the project name Android tools > Rename Application Package.
3. Manually set the package names in the Manifest that have not been changed by the previous steps.