Attaching source to android-support-v4.jar
In Eclipse Property for android-support-v4.jar:
The current class path belongs to container 'Android Private Libraries' which does not allow user modifications to source attachments on its entries.
solution:
touch a file android-support-v4.jar.properties in the same directory
echo 'src=/xxx/xxx/support/v4/src' to this file.
restart eclipse