Where Does Qt Look For Java Classes When Using Jni

I'm trying to use JNI in Qt. I would like to know where should I put the java classes. There are many posts about JNI on the internet, but they assume you know where to put the cla

Solution 1:

They should reside in src folder under your ANDROID_PACKAGE_SOURCE_DIR. Lets say I have a java package org.me.mypack , then what I do is create the FQ path for the package under: ANDROID_PACKAGE_SOURCE_DIR/src

Suppose my ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android

eventually I will have this path:

$$PWD/android/src/org.me.mypack

and call a static method in my class:

QAndroidJniObject::callStaticMethod<void>("org.me.mypack/Utilities",
                                        "requestPermissions",
                                        "(Landroid/app/Activity;)V",
                                        QtAndroid::androidActivity().object());

So in your case, you ought to create your package path:

ANDROID_PACKAGE_SOURCE_DIR/src/app1 --> $$PWD/android/src/app1

and put your java class file MyJavaClass.java and other java classes for the package in that path.

If you haven't already done, check JNI Crash Course, which uses same call as your example, but with different package!

Extending your Qt Android application using JNI

in the example note the file path: //java file android/src/com/kdab/training/MyJavaClass.java and the call:

return QAndroidJniObject::callStaticMethod<jint>
 ("com/kdab/training/MyJavaClass"// java class name
 , "fibonacci"// method name
 , "(I)I"// signature
 , n);