For the future generations of humanity:
QJniObject toast = QJniObject::callStaticObjectMethod(
"android/widget/Toast",
"makeText",
"(Landroid/content/Context;Ljava/lang/CharSequence;I)"
"Landroid/widget/Toast;",
QNativeInterface::QAndroidApplication::context(),
displayText.object<jstring>(),
timeout
);
if (toast.isValid()) {
qDebug() << "Toast is valid";
toast.callMethod<void>("show");
} else {
qDebug() << "Toast JNI object not valid";
}
