Added extractNativeLibs="true" to the lib's manifest.

That should cause the stunnel binary to be extracted onto the device, where the Java lib can use it. Without this option, it depends on the app's minSdk whether the native libraries are extracted or not.

Author: FWink

stunnel/build.gradle

@@ -6,8 +6,8 @@ android {
     defaultConfig {
         minSdkVersion 9
         targetSdkVersion 29
-        versionCode 1
-        versionName "1.0"
+        versionCode 10000001
+        versionName "1.0.1"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {

stunnel/src/main/AndroidManifest.xml

@@ -1,5 +1,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="de.fwinkel.android_stunnel">
 
-    <application />
+    <application
+        android:extractNativeLibs="true" />
 </manifest>