我的“ src”文件夹中的所有代码行在Eclipse中均存在错误

Question

Am having problems with development in android as all my lines of code in all the files in the src folder where am placing my java files have errors on them. I do not know where the problem is coming from!

First had problems where 'R' was underlined in red. then after Ctrl+Shift+O, I exited my eclipse and on opening it, that's what I saw on my java files

Answer 1

Go to

Project Properties>Java Build Path>Libraries tab

and make sure JRE is added, if not, click "Add Library..." and add it.

Answer 2

All errors seems related to Android's specific classes:

• you may have a problem with you Eclipse+ADT installation

• you may have pasted the code into the wrong type of project

• you may simple missing the corrisponding import

Last is simplier to verify, just hover with mouse over the error and see if Eclipse suggests you to add a specific import