Develop Reference

Xamarin Forms Error "invalid resource directory name: /Path/res Icon "res Icon"

Yesterday everything worked fine and the app get build successfully.
But when I want to build the app now, I always get the following error:
invalid resource directory name:
/path/to/project.android/obj/Debug/Ip/26/jl/res Icon "res Icon".
Does somebody know how to fix that?

It seems like you have a space character in the name of your resource file or directory which is not allowed:
"File-based resource names must contain only lowercase a-z, 0-9, or underscore"

I don't know how but this fixed my problem.
Use incremental Android packaging system (aapt2).

Accidently created a new drawable values resource and getting Build errors. How to delete the resources?

I accidentally created new drawable value resources :
Here is a snapshot of how i did it
How can i delete these two resource ?
the two resorces i want to delete : Jobs,jobs
I am getting this build error:
/home/thebitshoes/Desktop/ClassProject/app/build/intermediates/res/merged/debug/values/values.xml
Error:(484, 69) String types not allowed (at 'Jobs' with value '').
Error:(484, 69) String types not allowed (at 'Jobs' with value '').
Error:Execution failed for task ':app:processDebugResources'.
com.android.ide.common.process.ProcessException: Failed to execute aapt

Close the project, go to the specific file externally and remove the resource value(if this doesn't work then delete file) and then start the project again. It helped me.

Okay!! here I figured it out :
My values folder contained an XML file named refs.xml . Inside the file , i had two resource items Jobs , job . I deleted the refs file itself . Now its working!!!
Thank you all!! :)

Delete your xml file or rename it with small character and valid file name,
in App module delete "build" directory, then rebuild the directory hope this helps. Because build directory has old references.

How to change android application resource id value

Generally, AAPT is packaging an application with fixed resource id, and the id value is starting with "0x7f".
I want to replace this integer value with other value, like "0x6f" or something.
I found the code line to handle this, and modified the aapt code. (path : /frameworks/base/tools/aapt/)
But, when building an application, I got the build error message like:
/apps/myapps/AndroidManifest.xml:9: error: Error: No resource found that matches the given name (at 'icon' with value '#drawable/ic_launcher_app')."\
Is there any way to solve this build error ?

According to this Android resources dev page you should never modify the R file yourself as it is generated automatically
Caution: You should never modify the R.java file by hand—it is generated by the aapt tool when your project is compiled. Any changes are overridden next time you compile.

That means ic_launcher_app image not in your drawable folder. And also if you change image format manually like .jpg to save as .Png without using any software that AAPT(while compile resources into binary assets) issue will occur.so use proper image formats.

Invalid file name: must contain only [a-z0-9_.]

I have file /FavoriteTwitterSearches/res/menu/FavoriteTwitterSearches.xml in my android project. When I want to run the project - i get error "res\menu\FavoriteTwitterSearches.xml: Invalid file name: must contain only [a-z0-9_.]". But if I change the file name for a-z,0-9 there is another errors in /R.java/R/string/confi
like
Multiple markers at this line
- Duplicate field R.string.confi
- Syntax error on token "rmTitle", delete
or
Multiple markers at this line
- Syntax error on token "rmMessage", delete
this token

"res\menu\FavoriteTwitterSearches.xml: the res folder accepts only small case letters
change your file name to
favoritetwittersearches and it will work

Capital letters are not allowed in naming any .xml files. using it will give you an error.

No resource found that matches the given name in Manifest

I'm getting this error when trying to build the application. The xml editor did not highlight both error as missing. As the file/string are already there.
android-apt-compiler: [XXX]
D:\private\xxx\android\XXX\src\AndroidManifest.xml:35: error: Error:
No resource found that matches the given name (at 'icon' with value
'#drawable/ic_launcher').
android-apt-compiler: [XXX]
D:\private\xxx\android\XXX\src\AndroidManifest.xml:233: error: Error:
No resource found that matches the given name (at 'value' with value
'#string/FacebookAppID').
The project structure is like this:
ProjectFolder
|-external_lib
|-src
|-src (actual source)
|-res
|-...
I can confirm that both file is already in the project. As I use IntelliJ, I could just Ctrl + click then it open those files for me. However, I'm still getting this error.
I checked with both Google and SO. Most of the issues were about not having the files or storing in different folders. Which I can ensure that it is in the right place alongside hundred other files and strings.
Another issue is about % sign in strings.xml. I tried searching for "%" and nothing is found in the file.
Shutting down IDE and reopen it doesn't help, nor rebuilding the project. How could I get the app to build?

Look for any error message during the resource compilation.
Sometimes, if you have resource filenames containing illegal characters (such as underscores or uppercase letters), the whole process fails almost silently, and the IDE can't find any resources anymore.
I'm not sure that it's what is happening in your case, but I did eventually encounter such issues...