Develop Reference

Project Android not compiling with Eclipse?

k-9-master\k9mail\src\main\res\values\themes.xml:126: error: Error
retrieving parent for item: No resource found that matches the given
name '#android:style/Theme.Holo.Dialog'.
Why am I getting this error?

There are many possible causes of an error. However, if you simply do not see any reason this should be occurring, try a project clean, or simply create a new project and pull over all the files you intended to add to this project.
This is fairly likely to solve your issue as XML files often seem to cause me random problems - i.e. one day it is working, and the next time I open my project (e.g. if put it in different folder and bring it back to same location) it might not be working. I think Eclipse and Android Studio like to edit XML files by themselves sometimes without you knowing about it for some reason unbeknown to me.

Android accessing wrong resource ... How do I solve this?

Last night my code was working fine, today when I load it up, the raw resource I access in my code is trying to read from an id pointing to a string rather than an xml file in my raw folder.
I have used http://www.statman.info/conversions/hexadecimal.html to track the resource id's and match them to their R hex id's and I can SEE that it should be accessing 0x7f040002 but is accessing 7f060000 for some reason...
I have already looked at :
Accessing wrong raw resource in Android
I have done all of the following:
Clean, Rebuild, Run.
Delete R, Reboot Eclipse, Clean, Rebuild, Run
Delete R, Clean and Rebuild Immediately, Reboot
UmbySlipKnot's idea of deleting Gen Folder + all of the above.
Making sure Android.R is not being used anywhere.
Printed the actual resource id I am expecting to use by calling (returns expected id correctly!):
int resId=con.getResources().getIdentifier("raw_tsn_xml_amina_simple","raw",con.getPackageName());
Also rebuilt the project entirely from scratch. No matter what I do - it's always getting app name as the resource id it references for the Input Stream - source
None of these have worked for me... Does anyone have any ideas what else I can try?
I have also added images to show you what I noticed:
Debug Snippet:
Android R File Snippet:

I had this issue the other day with the wrong image resource ID being used. The only thing that worked for me was renaming the resource and renaming the references to said resource. So try renaming raw_tsn_xml_amina_simple.xml to something else.

Try removing Gen folder and let it regenerate. Then try again.

Apparently the eclipse debugger is not as dependable as I expected.
While I was working with the debugger, I noticed that resource ID is correctly being found, but when I really nitpick into the debugger, the inputStream seemed to be getting built from another source.
I thought that was the reason my code was crashing, but it wasn't.
I use a SIMPLE xml android library - if the xml you pass it is in an unexpected/invalid format, it can't build the data models you create (My XML was invalid - therefore the crash).
I did a roll back to notice that new XML I had added, crashed the run.
The debugger just cranked out... giving me nulls when things weren't null, showing different values even when my logs were printing correct values!
Once I saw this hapenning, I didn't trust the debugger as much as I ususally do.
My advice :
If the simpler solutions on this page have not worked for you - Take the following steps:
Suspect code additions first! If something you added suddenly breaks your working code, it's probably your own error.
If your debugger acts weird, print useful log information (It is much faster) to give you the right information in the right places.
These are the exact steps I took to find the root of the problem.

Newly created layout files not added to R.java

I have tried literally everything to figure out why no new layout files are being added to my R.java file in eclipse. Nothing is working.
I have:
Restarted Eclipse
Used Project>Clean
Deleted R.java (had to restore because it would not autoregenerate no matter what I did)
Ensured all methods are defined in SDK version
Rebuilt the project
Unchecked auto-build
Every combination of above options
Been tempted to throw my computer across the room
Does anyone have any suggestions?

Check you don't have any errors inside one of your xml files. That is, check not only for xml file name errors but also for errors in the xml code, for example an illegal attribute, a forgotten tag etc. Check this in all your xml files, not just layout files but also anim, xml drawables etc. These errors don't show up in the error log but will prevent the R.java from being generated.
When I experienced the same issue as you this was often the reason. The error highlight was only visible inside the file, not the error log.
Net, go through every xml file with a fine comb.

I faced this kind of problem many times. From my thoughts it is caused due to the problem of images in the drawable or case sensitive of layout file (everything should be small). Check your case sensitive of layout file.

I will give all possible solutions that i had done when something like this happened with me
Project-->clean
Check for library if there was any for that
RightClick-->Properties-->Android-->add
Restart Eclipse
Check in
the manifest for if you have many packages make sure u are using the
activity declared package.

I would check the imported R. The problem could be that you have
import android.R;
instead of
import com.myproject.R;

Project -> and check Build Automatically

Is there any error in your resource files? If there is any error in your resource files the R file will not be generated.

When first of u go on Project->Clean the your application then refreshing and auto genrated R.java file for your apps.

Not to be repetitive, but did you check the Android manifest file? The error there doesn't usually pop up.

Did you check for other locale letters (maybe whitespaces too?) in the filenames? Letters that look exactly like Latin.
I think I had similar problem with the names. You can try rewriting your files' names.

Project Explorer (Right click on your project) -> Build Project
This worked for me.

R.java file not updating with UI element's id

I added some UI elements to the main.xml file in the res\layout folder and when I try to access them through the call, R.layout.my_uielement, the UI element that I created is not there. Even when I add a new xml file with UI elements, it still doesn't show up in the R.layout class. I have made checked the ids on them and they have the correct format (I think): android:id="#+id/my_button". What could be the problem? Do I need to compile the code first?
UPDATE:
I have already tried adb kill-server then adb start-server. It doesn't seem to help. I have also tried R.id.my_uielement, it doesn't register either.

This may not be the case for you, but sometimes when I use something from the android.R package (default android resources) and I use it in my class before making reference to anything from my own resource package, Eclipse adds the import android.R; statement in my imports. This will conflict with the default behavior of implicitly looking in your package's resources.
Check your import statements for import Android.R;. If it's there, remove it. And, if you're using anything from android.R, fully qualify it when you use it in code.

Clean project works fine. In Eclipse if you just change some xml components, it doesn't always generate a new R file. Cleaning does it.

Use R.id.your_ui_element, not R.layout.your_element

I faced this problem too. The R.java was neither generated nor updated.
If R.java is not generated when you create the project, run your 'empty` project. An R.java with references to resources will be automatically generated.
If R.java is not getting updated, Check for updates in Help -> Check for Updates
in Eclipse and update your SDK and ADT if required.

After 2 days I found a way to fix it...
I had saved half done project in my mail, so when R.java vanished i just replaced it with the old R.java file, this fixed a lot of errors, then made necessary changes and built the project(build it not clean)...I do not know whether clean and build performs the same job or not..but everytime i cleaned it , R.java used to go invisible...

Clean is working because it BUILD the project after cleaning. So the problem is ( at least it was in my case, because I switched off the Automatic Build a few days earlier ) that after you add an item or anything in a .xml file, the eclipse doesn't build it and can't refresh the R.java .

I've noticed that my R.java file is not always being properly updated when I add items to my strings.xml file or elsewhere. If I use a new value I added like R.string.newString the actual integer value might still be pointing to R.string.oldString or whatever (it seems to usually be the element directly above or below the new element in strings.xml but I haven't nailed down the pattern for sure yet).
You're not supposed to modify the R.java file, but it doesn't say anything about deleting it (not that I've seen, anyway). I've found that deleting R.java usually fixes my resource-related problems because Eclipse immediately regenerates the file with the integer values properly assigned.
Please note, I'm very much a beginner at Eclipse so I may not understand the consequences of deleting R.java but it seems to be working well for me so far. If what I'm doing is very bad, please let me know.

None of these worked for me!
The only way i can access an #+id/foo is by myPackage.R.id.foo.

Why are my resources suddenly unresolved in my Android project?

Eclipse is complaining about my Android project saying all my references to resources are unresolved, even though R.java does exist. For example:
signin_btn=(Button)findViewById(R.id.signin_btn); signin_btn.setOnClickListener(this);
I definately have signin_btn defined in my resources. Dont know why Eclipse is not seeing my R class anymore. How to fix?

The thing that happens to me once in a while is that Eclipse decides to "help" me by adding the following statement to the top of the source file:
import android.R;
This means that all non-absolute references will now be matched against the Android built-in resources, instead of your own. Something like "R.id.layout" is now supposed to be in "android.R.id.layout" and not in "com.mydomain.myproject.R.id.layout". Just remove the line.

It happens to me, this is what I think happens:
Whatever process generates R.java starts at the top of your resources and works to the bottom. If it encounters an error somewhere, it just stops... leaving whatever resources haven't been added to R.java out. This is why some of them will say "unresolved", and others will be fine.
It seems that every time you save a file in your project, it regenerates R.java (maybe it's just the files in res/), so you probably fixed whatever the generator broke on, and when you saved AndroidManifest.xml, it regenerated R.java.