Android Question Failed to load OpenCV's so file

xulihang · 2025-09-19T08:06:18+0100

I am trying to include opencv (https://repo1.maven.org/maven2/org/opencv/opencv/4.9.0/opencv-4.9.0.aar) in my project with the following code:

B4X:

#AdditionalJar: opencv-4.9.0.aar
Dim system As JavaObject
system.InitializeStatic("java.lang.System")
system.RunMethod("loadLibrary",Array("opencv_java4"))

But I meet the following error:

Caused by: java.lang.UnsatisfiedLinkError: dlopen failed: library "libopencv_java4.so" not found

What is the correct way to do this? I can load the library using a native android project using System.loadLibaray("opencv_java4") but not with B4A.

DonManfred · 2025-09-19T08:08:32+0100

xulihang said:
I can load the library using a native android project using System.loadLibaray("opencv_java")

opencv_java and NOT opencv_java4!

xulihang said:
system.RunMethod("loadLibrary",Array("opencv_java4"))

What is the reason to use another name?

xulihang · 2025-09-19T08:11:36+0100

DonManfred said:
opencv_java and NOT opencv_java4!

What is the reason to use another name?

The correct text is opencv_java4. I misspelled it the post.

xulihang · 2025-09-19T08:23:01+0100

I see. It is more complicated than I thought: https://www.b4x.com/android/forum/threads/how-to-load-so-libraries-using-inline-java.50827/#content

I use the following code to load the library now:

B4X:

Dim loader As JavaObject
loader.InitializeStatic("org.opencv.android.OpenCVLoader")
loader.RunMethod("initLocal",Null)

Android Question Failed to load OpenCV's so file

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