About these JNI Wrappers#

These are fairly simple wrappers around Java classes, using JNI and JNIPP to allow relatively-painless use of Java classes from C++. They are populated as-needed: if you need a method/property that's missing, add it!

Conventions#

All classes derive from ObjectWrapperBase or one of its subclasses. (Yes, you can directly mirror inheritance in Java with inheritance in these wrappers.)

All should have a public internal struct called Meta that derives publicly from either MetaBase or MetaBaseDroppable (the more common option, when you don't often need the class object itself), with a member for each method ID. Only the Meta() constructor should be in the .cpp file for a given wrapper: the rest lives in the header so it may be inlined and thus optimized away.

Finding signatures#

A command like the following can help you get the JNI signatures of methods:

javap -s -classpath ~/Android/Sdk/platforms/android-26/android.jar android.service.vr.VrListenerService

Adjust the location of the SDK and the class under investigation as needed.