R Cannot Be Resolved - Android Error

R cannot be resolved - Android error

What Will said was right

R is an automatically generated class that holds the constants used to identify your >resources. If you don't have an R.java file (it would be gen/eu.mauriziopz.gps/R.java in >Eclipse with the 1.5 SDK) I would recommend closing and reopening your project or going to >Project > Build all (and selecting "Build Automatically" while there as recommended by >Josef). If that doesn't work than try making a new project, if the problem is recreated than >post here again and we'll go into more detail.

but I've found out that there was another problem that was causing the first one. The tools in the SDK directory didn't have the permissions to be executed, so it was like the didn't exist for Eclipse, thus it didn't build the R.java file.

So modifying the permission and selecting "Build Automatically" solved the problem.

Error: R cannot be resolved

Remove this import:

import android.R;

It seems that your Eclipse tried to incorrectly auto import the R class from the wrong location. Removing that line should solve the problem.

If it doesn't, also try to add this import:

import br.com.app.R;

If that doesn't solve the issue, try to clean and rebuild your project after doing the steps above.

Note: Don't use Eclipse, it's not officially supported anymore as you can see on this link. Switch to Android Studio instead, you can download it here.

R cannot be resolved to a variable?

Dont worry. First you may clean the project, then run the project. If this does not work then follow the following links:

Here is the best way to solve this problem: [Android Development- Where is my R.Java file?][2]
R.java not regenerating
R cannot be resolved - Android error
R cannot be resolved to a variable
R cannot be resolved to a variable -- mailing list entry
Fixed: R cannot be resolved to a variable

Android tutorial error: R cannot be resolved to a variable

I'm working my way through the same example, and had the same (or very similar) problem.

Finally I noticed that there was a tiny little red x on the manifest.xml.
Sure enough, it was complaining about this:

android:label="@string/title_activity_hello_world" >

So I added:

<string name="title_activity_hello_world">Hello World</string>

to strings.xml and now it works.

Android Error Cannot resolve symbol 'R'

In the comments above, @Udit posted a link to another sort of related question from which I was able to get a solution. Incase you run into a similar problem, the solution is quite simple. Reboot Android Studio and then go to Build->Rebuild Project. Hope this will sort out your issue as it did mine. Thank you all for your contribution.

R Cannot Be Resolved - Android Error