Android Eclipse compiler do not see the layouts and ids - java

The problem is that the Eclipse compiler do not see any layout or ids, or even strings and values in res folder, though R class is generated well (I've opened it, but of course didn't change enything). So I've tried to Clean and Build project and even restart Eclipse, compare the ids - the problem is still Eclipse don't see anything from res.
What should I do? May be someone solved this yet?

The SDK generates resource classes in the root package of your project. So, if your root package is com.project, and you're trying to use it from some other package (which is or is not directly under the root package), you need to import com.project.R.

i think importing import android.R; you can't see any ids or layouts or strings
change it in import com.companyname.projectname.R;
Get package name from android manifest file.and import like import packageName.R;

Related

Intellij class Import being added to object not the top of class

I've just started a new IntelliJ project. When I try and import a java class with the IntelliJ import shortcut, the import is being added to the object and not to the top of the class like it normally would.
Where in the settings can I change this?
See Preferences/Settings > Editor > Code Style > Java if this option ...
Use fully qualified class names
... is ticked then IntelliJ will always use fully qualified class names. If you disable this option then Intellij will include the import statement and refer to the class by its 'simple' name.
Here's a screenshot showing this configuration item:
If the accepted answer is not working for anyone, Try the below points too.
Check whether the class file is in correct package and resolve if there is any issues in the class file.
Click File -> Invalidate Caches/ Restart and Click Invalidate and Restart button, Once it restarted U'll be able to import properly.
I was facing this issue with my custom / generated(protobuf) java packages.
Solution (TDLR)
Whenever you face this issue, just check the package or class that getting imported doesn't have any error(red marking).
If so try to fix that.
I was having an issue with package naming and its actual location. By generated-sources -> Right Click -> Mark Directory As -> Sources Root corrected my issue.
Check whether generated-sources or folder under the generated sources need to mark us Sources Root.
My issue was with generated java files (Adding this just to help someone else with same issue)
Intellij shows red mark for Import with wildchar(import pkg1.subpkg1.*;). Like editor was unable to recognizing 'import all' under a package.
But direct import to the inner package was fine.
On top of that an resolving issue with import class add full package to the Class itself, instead of adding import statement on top the java file.
This issue didn't affect the code compilation, only in editor it was showing red mark.

How to import correct package for StdDraw?

I want to use the StdDraw package, and I've tried many different ways of importing it.
Of course I tried:
import StdDraw;
But, when I look at the documentation from Princeton here, it shows that StdDraw is part of Objects, so I try this:
import java.lang.Object.StdDraw;
However, this results in an error:
error: cannot find symbol in
import java.lang.Object.StdDraw;
I saw this question here but it does not answer this question either.
How do I import StdDraw? thank you.
if you want to use StdDraw you must have
either the sources
or the classes (best zipped up as jar)
as preferred way you use the sources (see http://introcs.cs.princeton.edu/java/15inout/). it says there "To use these libraries, download StdIn.java, StdOut.java, StdDraw.java, and StdAudio.java into the same directory as your program. "
once you did this the imports should be working.
NOTE: all four files are not in packages, so you should 'download' them into the 'standard' package. That means you have to download them to the root package of your project.
by the way: don't import import java.lang.Object.StdDraw; but do just import import StdDraw;
First of all check encoding of your IDE. It should be set to UTF-8. It is important if you are using MS Windows operating system.
Then create StdDraw.java class in the same package as the package of your program you are writing. Remove class declaration, leave only package declaration.
Then visit this page: https://introcs.cs.princeton.edu/java/stdlib/StdDraw.java .
Copy all its contents (Ctr-A, Ctrl-C) and then paste it into StdDraw.java file you created previously.
StdDraw.java has its own main method so try to run it in order to check that the library works correctly. You should see a window with four strange figures :) .
Don't touch StdDraw.java anymore. Now you can easily import StdDraw library and refer to its methods with name of the class.
Enjoy

Eclipse type / import error with built java file

I have a project where we use a ant buildfile to create some .java files. Those built files need to reference to already existing other java files.
My problem is that the built file can have a code line as for example
arg = (Expr) new Ast.BinaryOP(lhs, BOp.B_MINUS, rhs);
where it will show an error "Ast.BinaryOP cannot be resolved to a type". I then can type Ast.BinaryOP again and use autocomplete to pick the BinaryOP part and the error will disappear. The same with BOp.B_MINUS.
I did import (probably way too many times) the necessary other files as far as I can tell.
I.e.
import cd.ir.Ast;
import cd.ir.Ast.*;
import cd.ir.Ast.Expr;
import cd.ir.Ast.BinaryOp;
import cd.ir.Ast.BinaryOp.BOp;
So far I tried
restarting Eclipse
'clean' the project
to just run the project anyway (doesn't work)
remove the "Ast." part which will work once again if I do it in Eclipse but not if generated that way
Google the problem, respectively search it on Stackoverflow which turned out to be hard as there are many related issues. There are no good keywords as far as I can tell.
deleted the project from Eclipse and imported it newly
I need to repeatedly run the ant build file to test the code from where the .java file is generated, thus changing all errors manually is not an option.
Thanks for any advice/help in advance. I will gladly provide more information if you tell me what could help.
Hit F5 on the project, open the file, and then try hitting Ctrl+Shift+O to automatically organize the imports.
After consulting with a friend who didn't see the issue either I finally found it. So logical in retrospect but small enough that I spend 2,5h trying to find it:
import cd.ir.Ast.BinaryOp;
vs:
new Ast.BinaryOP(....
BinaryOp vs. BinaryOP

Again, R.java not found

I have a lot of java files in my project so I decided to create packages and organize those files. After putting them in seperate packages like
com.myproject.android.activity
com.myproject.android.adapter
etc...
eclipse wants me to import the R file. From different SO questions I know "Never import the R file". However without that eclipse shows error messages that R.java is missing and wants to import it.
I already did a eclipse restart, clean, and android->fix with no success. My resource files are without errors. Is it safe to import the R file. Any suggestions?
Yes, you can import R files, they are sometimes needed to be imported, e.g. when you define them in a library and you need to use them in the package that uses that library.
You can also use full names - this may make the code more clear even if longer.

The import javazoom cannot be resolved

hi all
i use the javazoom.jl.player.Player package but it is says The import javazoom cannot be resolved. i am using eclipse and doing Android project. i clean the project still the same error is shown. please correct me.
If eclipse can't resolve a package fragment of an import statement, then it tells you (with that error), that there is no library on the classpath that contains a class from that package (or from a package whose name starts with the missing part).
An easy way for standard java/eclipse:
create a folder lib in your projects root directory (with the eclipse workbench!)
copy and paste the jar into that folder
right-click the copied jar and select "add to build path".
This should eliminate the compiler errors immediately.
(Previous part of the answer)
Taking the error message literally, it looks like you have a line of code like that:
import javazoom;
This would be wrong, because we don't import packages but classes from a package. To import all classes from the javazoom package, we'd say:
import javazoom.*;
You should download the .jar of jLayer ( http://www.javazoom.net/javalayer/sources.html )
And add into classpath in the way Andreas_D told you.

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