Package: pyjnius
PyJNIusA Python module to access Java classes as Python classes using the Java Native
Interface (JNI).
Warning: the pypi name is nowpyjniusinstead ofjnius.Installationpip install pyjniusQuick overview>>>fromjniusimportautoclass>>>autoclass('java.lang.System').out.println('Hello world')Helloworld>>>Stack=autoclass('java.util.Stack')>>>stack=Stack()>>>stack.push('hello')>>>stack.push('world')>>>print(stack.pop())world>>>print(stack.pop())helloUsage with python-for-androidGetpython-for-androidCompile a distribution with kivy (PyJNIus will be automatically added)Then, you can do this kind of things:fromtimeimportsleepfromjniusimportautoclassHardware=autoclass('org.renpy.android.Hardware')print('DPI is',Hardware.getDPI())Hardware.accelerometerEnable(True)forxinxrange(20):print(Hardware.accelerometerReading())sleep(.1)It will output something like:I/python  ( 5983): Android kivy bootstrap done. __name__ is __main__
I/python  ( 5983): Run user program, change dir and execute main.py
I/python  ( 5983): DPI is 160
I/python  ( 5983): [0.0, 0.0, 0.0]
I/python  ( 5983): [-0.0095768067985773087, 9.3852710723876953, 2.2218191623687744]
I/python  ( 5983): [-0.0095768067985773087, 9.3948478698730469, 2.2218191623687744]
I/python  ( 5983): [-0.0095768067985773087, 9.3948478698730469, 2.2026655673980713]
I/python  ( 5983): [-0.028730420395731926, 9.4044246673583984, 2.2122423648834229]
I/python  ( 5983): [-0.019153613597154617, 9.3852710723876953, 2.2026655673980713]
I/python  ( 5983): [-0.028730420395731926, 9.3852710723876953, 2.2122423648834229]
I/python  ( 5983): [-0.0095768067985773087, 9.3852710723876953, 2.1835119724273682]
I/python  ( 5983): [-0.0095768067985773087, 9.3756942749023438, 2.1835119724273682]
I/python  ( 5983): [0.019153613597154617, 9.3948478698730469, 2.2122423648834229]
I/python  ( 5983): [0.038307227194309235, 9.3852710723876953, 2.2218191623687744]
I/python  ( 5983): [-0.028730420395731926, 9.3948478698730469, 2.2026655673980713]
I/python  ( 5983): [-0.028730420395731926, 9.3852710723876953, 2.2122423648834229]
I/python  ( 5983): [-0.038307227194309235, 9.3756942749023438, 2.2026655673980713]
I/python  ( 5983): [0.3926490843296051, 9.3086557388305664, 1.3311761617660522]
I/python  ( 5983): [-0.10534487664699554, 9.4331550598144531, 2.1068975925445557]
I/python  ( 5983): [0.26815059781074524, 9.3469638824462891, 2.3463177680969238]
I/python  ( 5983): [-0.1149216815829277, 9.3852710723876953, 2.31758713722229]
I/python  ( 5983): [-0.038307227194309235, 9.41400146484375, 1.8674772977828979]
I/python  ( 5983): [0.13407529890537262, 9.4235782623291016, 2.2026655673980713]Advanced exampleWhen you useautoclass, it will discover all the methods and fields of the
class and resolve them. You may want to declare and use only what you
need. The previous example can be done manually as follows:fromtimeimportsleepfromjniusimportMetaJavaClass,JavaClass,JavaMethod,JavaStaticMethodclassHardware(JavaClass):__metaclass__=MetaJavaClass__javaclass__='org/renpy/android/Hardware'vibrate=JavaStaticMethod('(D)V')accelerometerEnable=JavaStaticMethod('(Z)V')accelerometerReading=JavaStaticMethod('()[F')getDPI=JavaStaticMethod('()I')# use that new class!print('DPI is',Hardware.getDPI())Hardware.accelerometerEnable()forxinxrange(20):print(Hardware.accelerometerReading())sleep(.1)You can use thesignaturesmethod ofJavaMethodandJavaMultipleMethod, to inspect the discovered signatures of a method of an object>>>String=autoclass('java.lang.String')>>>dir(String)['CASE_INSENSITIVE_ORDER','__class__','_JavaClass__cls_storage','__delattr__','__dict__','__dir__','__doc__','__eq__','__format__','__ge__','__getattribute__','__gt__','__hash__','__init__','__init_subclass__','__javaclass__','__javaconstructor__','__le__','__lt__','__module__','__ne__','__new__','__pyx_vtable__','__reduce__','__reduce_ex__','__repr__','__setattr__','__setstate__','__sizeof__','__str__','__subclasshook__','__weakref__','charAt','checkBounds','clone','codePointAt','codePointBefore','codePointCount','compareTo','compareToIgnoreCase','concat','contains','contentEquals','copyValueOf','empty','endsWith','equals','equalsIgnoreCase','finalize','format','getBytes','getChars','getClass','hashCode','indexOf','indexOfSupplementary','intern','isEmpty','join','lastIndexOf','lastIndexOfSupplementary','length','matches','nonSyncContentEquals','notify','notifyAll','offsetByCodePoints','regionMatches','registerNatives','replace','replaceAll','replaceFirst','split','startsWith','subSequence','substring','toCharArray','toLowerCase','toString','toUpperCase','trim','valueOf','wait']>>>String.format.signatures()[(['java/util/Locale','java/lang/String','java/lang/Object...'],'java/lang/String'),(['java/lang/String','java/lang/Object...'],'java/lang/String')]Each pair contains the list of accepted arguments types, and the returned type.TroubleshootingMake sure a Java Development Kit (JDK) is installed on your operating system if
you want to use PyJNIus on desktop. OpenJDK is known to work, and the Oracle
Java JDK should work as well.On windows, make sureJAVA_HOMEpoints to your java installation, so PyJNIus
can locate thejvm.dllfile allowing it to start java. This shouldn't be
necessary on OSX and Linux, but in case PyJNIus fails to find it, settingJAVA_HOMEshould help.SupportIf you need assistance, you can ask for help on our mailing list:User Group :https://groups.google.com/group/kivy-usersEmail      :kivy-users@googlegroups.comWe also have a Discord server:https://chat.kivy.org/ContributingWe love pull requests and discussing novel ideas. Check out ourcontribution guideand
feel free to improve PyJNIus.The following mailing list and IRC channel are used exclusively for
discussions about developing the Kivy framework and its sister projects:Dev Group :https://groups.google.com/group/kivy-devEmail     :kivy-dev@googlegroups.comLicensePyJNIus is released under the terms of the MIT License. Please refer to the
LICENSE file for more information.BackersThank you to all our backers! 🙏 [Become a backer]SponsorsSupport this project by becoming a sponsor. Your logo will show up here with a link to your website. [Become a sponsor]