Why is my Android NDK project throwing a ClassNotFoundException for my activity?

java.lang.ClassNotFoundException: Didn't find class on path: dexpathlist

When attempting to run an Android project utilizing pure native ndk, developers may encounter the following error:

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.irrlicht.example1/android.app.POMActivity}: java.lang.ClassNotFoundException: Didn't find class "android.app.POMActivity" on path: DexPathList[[zip file "/data/app/com.irrlicht.example1-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.irrlicht.example1-2, /system/lib]]

This error typically indicates a mismatch between the activity class declared in the AndroidManifest.xml and the actual implementation in the code. Here are steps to resolve this issue:

1. Ensure Correct Activity Class: Verify that the attribute in the AndroidManifest.xml matches the fully qualified name of the activity class in your code (i.e., android.app.POMActivity in this case).
2. Disable Instant Run: In Android Studio, disabling Instant Run can sometimes resolve classpath-related issues. Navigate to File -> Settings -> Build, Execution, Deployment -> Instant Run and uncheck the checkbox for "Enable Instant Run".
3. Clean and Rebuild: Clean your project and rebuild it to ensure a fresh build without any cached files. This can sometimes resolve issues with missing or incorrect classpath entries.
4. Check Import Statements: Verify that your main activity class has the necessary import statements for android.app.NativeActivity (or android.app.Activity if applicable).
5. Ensure Proper Linking: Make sure that the shared library containing the activity class has been properly linked in your Android.mk file. Check the LOCAL_SHARED_LIBRARIES line to ensure that HelloWorldMobile1 and android_native_app_glue are included.

If you've checked the above steps and the issue persists, please provide a full code snippet for further analysis and troubleshooting.

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