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Cannot resolve corresponding jni function

i read a lot of posts but cannot resolve this yet.
There is my error lines and structure of project:
Some libraries and configs I take from another project... And don't know where I went wrong.
I will give you source code of files if needed
Thank you for any help.

I've also been getting this error since upgrading from Android Studio 2 to 3. The code compiles, but the IDE isn't recognizing the native functions. (This may be due to a preprocessor macro I've created that simplifies JNI function names.)
I've suppressed this error in Java by adding #SuppressWarnings("JniMissingFunction") before my class declaration.

Ok, so this missing 'JNI function' isn't a big deal. I know it's highlighted red, but the function is being linked, just not in a way that the IDE can determine.
First, here's the relevant source code: https://github.com/koreader/crengine/blob/master/android/jni/cr3engine.cpp#L770
CrEngine is linking the functions at run time. The reason why your IDE isn't picking them up is because the CrEngine functions start with Java_org_ instead of Java_com_. If you were relying on the engine to automatically link, this would be an issue, but as stated before, they are being explicitly linked at runtime with jniRegisterNativeMethods.
Do a clean and update your build tools to 25.0.3 (or better) in your gradle.build file. Update your SDKs and NDK. Then rebuild. Some of the errors I saw could be caused by older build tools.

I'm having a trouble with starting Eclipse : Error : ... cannot be solved to a type

I really don't know what the problem is.
I followed several web postings about installing and settings of JDK/ JRE and also completed clearly on environment variables :Path & CLASS PATH
I'm sure about that since i checked the cmd and it worked well.
the same problem occured over and over again.
I corrected on Library tab
I add the Library list like this,
But, I still have the same problem. Did I make a severe mistake? what should I do about this problem?
still have JAVA problems

Please check the Java source directory configuration under Java Build Path, Source tab and Java Compiler version settings.

Did you recently update your Java version? If so, then you have to readjust your path so that it directs to the new updated version.

Cannot resolve com.parse.ParseQueryAdapter

My current setup :
OS : windows 7
IDE : Android Studio (with updated SDKs)
Parse jar (v 1.10)
I am trying out an example for ParseQueryAdapter, and I run into this error on my IDE : import com.parse.ParseQueryAdapter; -> cannot resolve symbol ParseQueryAdapter
I want to try something similar to this example, and the import does not seem to go through because of the error.
If you need anymore information, please leave comments & I will respond.
PS : I am able to add com.parse.ParseObject without errors.

In your libs folder you'll find Parse-1.4.1.jar file.
Right click or control+click on it then 'Add as Library...'
Edit: Parse-1.10 does not have ParseQueryAdapter. You have to use Parse-1.4.1, which is included in that example.

ParseQueryAdapter was removed from the official Parse SDK and moved onto the Parse-UI libraries..
You can install them on via this link: https://github.com/ParsePlatform/ParseUI-Android

If we include 1.4.1, and keep 1.10.1 as well, it gives error because we cannot keep the same jar with two versions in the libs folder. And I think its not advisable to use just 1.4.1. I feel that ParseQueryAdapter is deprecated and we would just have to use the normal adapters. Any comments?

Android Java compiler error (compiling old files?!)

I refactored some packages in my IDE and everything seems to be ok. But when I compile my app I get an error that file x.java can't be read in x.java.
Both files are located in the old packages which do not exist anymore.
The package definition is fine in all classes. Also the Manifest is fine.
I'm using IntelliJ IDEA from JetBrains.
java: error reading K:\APP\src\com\renemaas\android\APP\About.java; K:\APP\src\com\renemaas\android\APP\About.java (The system can't find this path)
I hope someone can help me with this problem.
Note: Yeah I have search for nearly 1 hour to solve this problem on my own. I'm new to Android development.

String cannot be resolved to a type - Java RAD

I've recently started developing in Java (coming from .Net). The IDE I am using is RAD 7.3.
After importing a project, which I need to do some enhancements on, I am receiving this error:
"String cannot be resolved to a type"
This applies to all variables of the String data type, as well as any methods that take string arguements. I'm very inexperienced with Java so I'm not sure how to go about fixing this. My guess is that it has something to do with the way RAD was installed, and that required libraries are missing. Again, not sure how to address that.
Any help or guidance would be much appreciated! Thank you

My guess is you miss the JRE Runtime Library in your project. But this would cause all the java.* classes to generate this message! Can you post your code so we can see what might be the problem?
try doing :
right-click on your project.
->properites
->java Build Path
->tab Librairies
check if the JRE System Library is there.

i am a beginner. i am using Eclipse and got stuck at the Hello World code. Got same error description and also error stating can't resolve 'system'.
After staying frustrated for few hours, as I checked JRE library path and stuff, I just Capitalized 'S' of 'string' and 'system'.. and bang.. problem solved. I hope this helps.

I don't know if this helps anyone, but here I go.
I had the same problem just now in Visual Studio Code (I am on Linux). On my java.home, I had the options in my directory of:
/usr/lib/jvm/java-8-openjdk-amd64
/usr/lib/jvm/java-1.8.0-openjkd-amd64
I had the first one as default, but when I switched to the second one, it all started working properly.

You need to capitalize the "s" in the string.

Another way to solve this problem is in the following way.
Right click on the project-->properties-->Java build path-->go to the
library option
and delete or remove the library that is in error, after this you select add library and download the library that you deleted and ready.

error- string cannot be resolved to a type
Here in the declaring the method "string" in bold is lower case.
Change string to upper case.
Example:
public static string howManyPass(double grd1, double grd2) {
}