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java.lang.NoSuchFieldError caused by 3rd Party module

I've integrated a third party library in my Android project.
The library is provided in form of an .aar file.
Implementation of it, is a simple one-liner that creates a customdialog in my mainactiviy.
But whenever it tries to create the dialog my app will crash with
java.lang.NoSuchFieldError: de.thirdparty.lib.R$id.neverParticipateButton
at de.thirdparty.lib.views.DialogBuilder.buildView(DialogBuilder.java:97)
I have implemented the library in a new empty android project and it worked as planned. So it seems like there's a conflict with my project.
I've read in a different post (Here), that it can be caused when project and library accidentally use the same name for a layout. But when i inspect the library's code in my build folder, I can't find any layouts that use the same names. Also not ids or drawables.
Does somebody have an idea what else can cause this Error, or advice how to debug?
Kind Regards
Christian

Problem was that another 3rd Party library that was already integrated in my app had the same layout name as the new one... Nothing much i could do here but to inform the devs of the libs to use prefixes.

How do I use MUpdf in an existing java project

Mupdf documentation shows me how to use the library as an application and deploy it. However, I want to suck it into an existing java project and build my application on top of it. Can this be done? If so, how do I bring just the pieces needed, into my project?

Take a look at jMuPdf. I never used it, but it seems to be active.
Otherwise you will need to create Java Native Bindings (JNA or JNI).

Replace android default sqlite build

I would like to replace android default sqlite build for a new one having rtree feature enabled. It looks like I have to use a java wrapper to accomplish that and the only one I found android compatible was sqlite4java. I prefer sticking with standards. Unfortunately I found out jdbc is not supported in dalvikvm (Androids VM) and native android.database.sqlite works with an rtree disabled build of sqlite.
Currently I have a new .so sqlite rtree enabled library compiled for android but would like to substitute androids native one without having to use a third party wrapper like sqlite4java. Any ideas? I was thinking about downloading android.database.sqlite package from android sdk and building a jar to substitute only the .so load withing my application context. Is that the best approach?

I was thinking about downloading android.database.sqlite package from android sdk and building a jar to substitute only the .so load withing my application context. Is that the best approach?
So long as you are willing to refactor all necessary classes into your own package, that is probably your only approach. For example, that is what SQLCipher for Android does. They cloned ~37 classes from android.database and android.database.sqlite and modified them to use their own SQLCipher-enabled build of SQLite.

Android application : how to manage handwriting input?

I just want to know if there is some existing libraries to manage handwriting input/recognition?
I want to develop an application in which the user could write his text with a srylus, and not with a keyboard. I did research on Google and didn't find anything efficient for that.
Thank you,

It looks like Phatware has an SDK for their Writepad product, but only on iOS.
I don't see any public libraries available, but here's an SO post about it: https://stackoverflow.com/questions/768664/recommendations-for-handwriting-recognition-libraries-packages-in-java

Finally, I use some classes who are still in development. I have included in my project a class called FingerPaint.java, GraphicsActivity.java, PictureLayout.java and ColorPickerDialog.java (optional), not really useful for me right now. You could find these different classes here: FingerPaint
I worked pretty well for me, here is an app using it: Electronic calendar on Github

MyScript algorithm for recognizing handwritting input(such as normal input, math, geometry, music). Here's the link http://myscript.com/

Google App Engine "repackaged" package

What is the purpose of the classes in this package?
I want to use Base64 encoding in my app. As I'm typing away in Eclipse, I am prompted if I want to import a class called "com.google.appengine.repackaged.com.google.common.util.Base64"
I can't find any documentation about what this class does. No javadoc, or no mention in the Google App Engine manual (that I can see). Is this some kind of "hidden" API that I'm not supposed to have access to?

Is this some kind of "hidden" API that I'm not supposed to have access to?
Yes.
The purpose of repackaging Java classes is to have a private copy of a library that otherwise might conflict with another version of that some library (that the application developer adds to his project as a jar file).
It is one possible answer to JAR-hell.
Even the JDK makes use of this mechanism, e.g. with com.sun.org.apache.xerces which is an XML parsing library developed by the Apache Project that Sun choose to include (repackaged).
Do not call these classes directly. (You could, and they would probably work okay, but as they are not part of the official API, they could disappear in the next version).