A Python module to access Java classes as Python classes using JNI.
Warning: the pypi name is now pyjnius instead of jnius.
Requirements: Cython
pip install Cython
pip install pyjnius
>>> from jnius import autoclass
>>> autoclass('java.lang.System').out.println('Hello world')
Hello world
>>> Stack = autoclass('java.util.Stack')
>>> stack = Stack()
>>> stack.push('hello')
>>> stack.push('world')
>>> print stack.pop()
world
>>> print stack.pop()
helloYou need a java JDK installed (OpenJDK will do), Cython and make to build it.
Please ensure that your JDK_HOME or JAVA_HOME environment variable points
to the installed JDK root directory, and that the JVM library (jvm.so or
jvm.dll) is available from your PATH environment variable. Failure to do
so may result in a failed install, or a successful install but inability to
use the pyjnius library.
make
That's it! You can run the tests using
make tests
to ensure everything is running correctly.
- Get http://github.com/kivy/python-for-android
- Compile a distribution with kivy (pyjnius will be automatically added)
- Then, you can do this kind of thing:
from time import sleep
from jnius import autoclass
Hardware = autoclass('org.renpy.android.Hardware')
print 'DPI is', Hardware.getDPI()
Hardware.accelerometerEnable(True)
for x in xrange(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]
When you use autoclass, it will discover all the methods and fields of the object and resolve them. For now, it is better to declare and use only what you need. The previous example can be done manually as follows:
from time import sleep
from jnius import MetaJavaClass, JavaClass, JavaMethod, JavaStaticMethod
class Hardware(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()
for x in xrange(20):
print Hardware.accelerometerReading()
sleep(.1)If you need assistance, you can ask for help on our mailing list:
- User Group : https://groups.google.com/group/kivy-users
- Email : kivy-users@googlegroups.com
We also have an IRC channel:
- Server : irc.freenode.net
- Port : 6667, 6697 (SSL only)
- Channel : #kivy
We love pull requests and discussing novel ideas. Check out our contribution guide and 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-dev
- Email : kivy-dev@googlegroups.com
IRC channel:
- Server : irc.freenode.net
- Port : 6667, 6697 (SSL only)
- Channel : #kivy-dev
PyJNIus is released under the terms of the MIT License. Please refer to the LICENSE file.
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