Home Backend Development Python Tutorial 从Python程序中访问Java类的简单示例

从Python程序中访问Java类的简单示例

Jun 06, 2016 am 11:25 AM
python

from jnius import autoclass
>>> Stack = autoclass('java.util.Stack')
>>> stack = Stack()
>>> stack.push('hello')
>>> stack.push('world')
>>> stack.pop()
'world'
>>> stack.pop()
'hello'

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上面的代码中,我们使用 autoclass 函数,创建了一个类型代理,对应着Java中java.util.Stack类的所有方法和字段属性。

OK,也许你想要一个Android相关的例子,看这里:

from jnius import autoclass
from time import sleep
 
MediaRecorder = autoclass('android.media.MediaRecorder')
AudioSource = autoclass('android.media.MediaRecorder$AudioSource')
OutputFormat = autoclass('android.media.MediaRecorder$OutputFormat')
AudioEncoder = autoclass('android.media.MediaRecorder$AudioEncoder')
 
# Record the Microphone with a 3GP recorder
mRecorder = MediaRecorder()
mRecorder.setAudioSource(AudioSource.MIC)
mRecorder.setOutputFormat(OutputFormat.THREE_GPP)
mRecorder.setOutputFile('/sdcard/testrecorder.3gp')
mRecorder.setAudioEncoder(AudioEncoder.ARM_NB)
mRecorder.prepare()
 
# Record 5 seconds
mRecorder.start()
sleep(5)
mRecorder.stop()
mRecorder.release()
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好了,你可以从文档中获取更多的例子。

我们已经可以映射Java/Python的类型,原生数组,支持方法重载等等。我们在内部使用的是 Cython + JNI,因此消耗性能是最小的。

同时, Python for android库已经完成,你可以从github中获取。

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