How to resolve the issue of android resources - android

i'm new to android, i'm getting this error. please help me in providing the solution
Thanks in advance.

R cannot be resolved to a variable When we will get this error.
R.java is an automatically generated file to hold all your resources used in project. It will be created under gen folder when you build your project. While building your project it will assign IDs to each resource you used in project and keeps them in their individual classes (drawable, id, layout, etc.) and creates a file R.java, place it in your package.
If anything wrong in your resource files (drawables or xml layouts) it won't generate R.java file.
So please check it once. I too faced same problem previously.

All the resources in Android are referenced by an 'id'. This 'id' is generated automatically in the file 'R.java', which itself is generated in automatically in 'gen' folder, once you build the project.
So, what you have to do is just 'Build your Project'

Build you project and you will get you.package.name.R.java file - and just import it.

I think I saw the problem. You are having 2 folders named 'res'.
Just delete the res folder which is empty and Clean, build the project

if your gen folder is still missing then check whether you have done installation properly and then check if you have any error on any of the xml files in your project
refer following links
R cannot be resolved - Android error
No generated R.java file in my project
No generated R.java file in my project
http://www.joshuakerr.com/2009/10/23/android-and-the-missing-gen-folder/

Related

Eclipse wont generate R.java for achartengine.org

I have downloaded achartengine and imported him.
But when i import it Eclipse wont generate the R.java file.
I look into to source code they give to download and there is no R.java file.
I know to Eclipse should make it by itself by mine dont.
I tried clean.
build automatically is checked.
remove/import the package.
restart eclipse.
Thanks for helping :)
Cleaning the project will not generate R file if you have errors in your xml files under res folder.Check your all the res xml files and correct the errors and clean the project it will generate the R file for sure.And also check other resources like drawables. may be you are having drawables with invalid names.

R.java file gone all of a sudden

I was working on my project and it was fine until recently all of a sudden it went missing when I tried to run the project.This file is auto generated so why did this happen.
In my error log I am getting this error.
"Warning: Ignoring name conflict in resource file for name menu_settings"
Please help me out here.Thanks in advance.
R.java is autogenerated at compile time. If any error in the res folder occurs it can not be genarated. So check inside it for issue. You can use also the problems eclipse perspective
This happens if you have error in the xml files under res files, like layouts, string.xml etc.
Check your res folder, check with drawable and .xml files, if u have any error in xml Compiler will not generate R.java file and do this... Project -> Clean
check your resource file there seems some error.thats why your R.java not generating.
Checkout the Res folder specially images name and XML files follow naming convention for draw able.

How to find the resource name from exception

While running an application, I got the following exception.
android.content.res.Resources$ResourcesNotFoundException: Resource ID # 0X7F03000a
The exception trace points to the method- setContentView(R.layout.main)
But main.xml is present in the application directory.
How can I identify the resource name from the resource ID?
Thanks in advance!
Usually when something like that happens, it's because the build screwed up somehow so the generated R class doesn't have it.
In Eclipse, go to Project->Clean... and select your project. It will build your application from scratch.
Also, make sure that the layout main.xml is in the res/layout folder. It must be in that folder for Eclipse to auto-generate properly.
You can find it in the R class, it is a class generated automatically. If you are using eclipse, you can find it in the "gen" folder.

Cannot create R.java b/c project has errors...errors result from lack of R.java

edit: This is an Android project. My problem arose when I added a new .wav file to my 'raw' folder.
I seem to have gotten into an endless loop in Eclipse. I deleted my R.java file from my project. Choosing to "Clean" or "Build Project" has no effect (i.e. doesn't generate an R.java file, or put anything into the 'gen' folder, or create any .class files in the 'assets' folder).
I don't have the wrong package name in any of my classes or in my manifest.
I don't have any errors in any of my .xml files.
Every reference to 'R' in my classes are marked as errors, because the R.java file does not exist.
What can I do??
Try deleting the wav file first. If it doesn't fix your problem, look under problems tab and it will give you a direction on what to do. A wav file under res/ shouldn't produce any problems, just make sure its name is valid in Java (don't use -, for example).
I solved this problem creating a blank project and copying the folder "gen" from this project to others projects. After that I rebuilt all projects and Eclipse automatically replaced the R.java file.
if you rebuild it is there any error message on the console? or are you using capital letters or other special characters in your wav file?
Another issue I noticed, it seems that after closing and re-opening eclipse with a slightly invalid XML file, the XML was no longer recognised as having an error, but R.java refused to be generated correctly.
The offending XML attribute was:
<RelativeLayout ...
android:layout_alignRight="+id/">
In hindsight, I had been intending to complete this with a valid id but I exited the program before I had finished. Eclipse did not pick up the error when I restarted later, except to generate an invalid R.java with a missing VariableDeclaratorId (and no indication as to what caused it).

r cannot be resolved on ubuntu + eclipse + android sdk

Hi i have erorr "R cannot be resolved" everytime when i create android project in eclipse under ubuntu with android sdk. In windows everything ok. What's wrong?
R is a Java class created in source form by the build process. It contains definitions of locally unique numbers to refer to the assets under your project's 'res' directory.
See if you have a 'gen' folder in the route of your Eclipse project. Then look in this folder and see if you have R.java class under a package structure representing the same as the 'package' attribute in the manifest tag in your AndroidManifest.xml.
There is a common problem where the 'gen' folder gets deleted by Project->Clean, or where a project is copied from one workstation to another it seems sometimes the 'gen' folder does not get generated. You could try making a 'gen' folder of your own in your project root to see if this fixes it.
If you are referring to this file from a Java file with a package different to this you will have to explicitly 'import' it, but Eclipse should prompt you with assistance about this.
There is one useful trick, you just go to strings.xml and then press space than back space and CRTL+S this will rebuild your code and also generate everything in gen folder that is connected with strings.xml

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