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Editorial Team
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Asked: 2026-06-03T19:40:48+00:00

Ok, guys, I’ve read so many examples of javah usage and still got no

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Ok, guys, I’ve read so many examples of javah usage and still got no luck.
I have Eclipse Android project, so I try following:

cd /path_to_project/
javah -classpath ./bin/classes com.package.ClassName

What I get: 

class file for android.app.Activity not found

Ok, so, it sees my class and I just need to add android.jar to classpath:

javah -classpath ./bin/classes:path_to_sdk/android.jar com.package.ClassName

And I get: 

Could not find class file for com.package.ClassName

“You’re kidding me! You just saw it and now you can’t find it!”, I say.

Please, any help! I’m desperate here.

Tried compiling simple java class with javac and then using javah – it works fine.

My environment:
Windows 7, cygwin.

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1 Answer

  1. Editorial Team

    I’ll share what I’ve done to get javah to work for me. I hope it helps.

    For example, I’ve got a project with a package name of ‘com.android.MyProgram’. The activity source code file is located in the directory ‘Path-To-Project/src/com/android/MyProgram’ and the source code file is named ‘MyProgram.java’ and instantiates a class named ‘MyProgram’. My native code is in the directory named ‘Path-To-Project/jni’. I would use the following command line to run ‘javah’ for this project, run from the ‘Path-To-Project’ directory:

    javah -cp src -d jni com.android.MyProgram.MyProgram

    Again, I hope this helps.

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