When this problem occurred
1. Just try to kill adb process that still running.


#ps aux | grep adb

#kill -9 xxxx

and restart eclipse.

When you got error
"The serializable class XXXX does not declare a static final serialVersionUID field of type long."

try to ...
1. add serialVersionID field into the class.

When trying to build big project the error,
Java Heap Space
just occurred. Try to set ...

Window -> Preferences -> Java -> Installed JREs ->Edit

Go to Window -> Preferences -> General -> Content Types

Click on Text

on "Default encoding :" enter encoding type. for utf8 enter "UTF-8"
and then click Update button.

When I import android Project into Eclipse workspace. this below error just occurred.
Project has no default.properties file! Edit the project properties to set one.