R.id cannot be resolved [duplicate]

Answer 1

I had this problem too. I can't say a solution in general, but you can make a new workplace and copy the hardcode. In the future never click on clean or build, instead save or start eclipse again.

Answer 2

Yeah another fix I started the emulator. By running a helloandroid program, that did compile. And got out of eclispe and got back in don't know which one fixed the problem..

Cleaning the project etc didn't fix it - can i have 2 hrs of my life back!

Answer 3

Eureka! I've managed to make my first android project import to Eclipse!

Earlier I always got "Unable to find system library" under the project's Properties - Java build path - Libraries tab and it was impossible to correct it once it occured. The consequence was that no import statements could be resolved by anything imported.

In this case, I changed the JDK compliance level from 1.6 to 1.5 BEFORE I imported (afterwards its too late and cannot be mended). It must be done from Window - Preferences - Java - Compiler (earlier I thought this option was available only by right-clicking on already imported project). Then right-click on each project and set Properties - Android to a suitable Target (with the errors above, eclipse ignores any selection here). Then, I could even change back to JDK compliance level 1.6.

So, in general, changing the JDK compliance level before importing, might help.

And when deleting a project ALWAYS check the "Delete project content on disk (cannot be undone)" checkbox in the "Are you sure" dialog. Otherwise it is impossible to re-import the project, o if you've imported it with the wrong JDK compliance level the first time, it is impossible to correct the mistake, other than to try in another workspace.

These are the experiences of a very frustrated Eclipse user.

Answer 4

make sure you do not have any xml files with capitals in the name.

I had the same problem.

all the file names in res (and all its sub folders including layout) must be lower case only. This includes image files, xml files, etc (even if they aren't referenced anywhere within the project.)

Answer 5

Make sure there is not a hidden error in one of your .xml files.
Sometimes you can delete a statement in the strings.xml file that is important.

For example, in the Vogella example, I got the error:

Error: No resource found that matches the given name (at 'title' with value '@string/menu_settings').

I had deleted the line:

<string name="menu_settings">Settings</string>

Putting this back in or deleting res/menu/main.xml would solve the error.

Answer 6

If using Eclipse, run a clean build (Project/Clean...); this can often clear issues with the resources not being compiled correctly.