在AndroidStudio中运行python代码(使用Chaquopy)失败，

Question

我尝试在Android中运行python代码，但是它保持了make错误: FileNotFoundError

plt.savefig('C:/Users/userA/Desktop/Project/spam_1.png', dpi=300, bbox_inches='tight', pad_inches=0)

我创建了C:/Users/userA/Desktop/Project目录，并希望创建和保存文件名spam1.png

有一次我在朱庇特笔记本上试过，它没有出错，但是在安卓工作室.

这是错误代码

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.pbl4_importpython/com.example.pbl4_importpython.MainActivity}: com.chaquo.python.PyException: FileNotFoundError: [Errno 2] No such file or directory: 'C:/Users/userA/Desktop/Project/spam_1.png'
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: com.chaquo.python.PyException: FileNotFoundError: [Errno 2] No such file or directory: 'C:/Users/suajj/Desktop/PBL4/spam_1.png'
        at <python>.matplotlib.cbook.to_filehandle(__init__.py:432)
        at <python>.matplotlib.cbook.open_file_cm(__init__.py:447)
        at <python>.contextlib.__enter__(contextlib.py:113)
        at <python>.matplotlib.backends.backend_agg.print_png(backend_agg.py:529)
        at <python>.matplotlib.backend_bases.print_figure(backend_bases.py:2082)
        at <python>.matplotlib.figure.savefig(figure.py:2180)
        at <python>.matplotlib.pyplot.savefig(pyplot.py:722)
        at <python>.myscript.main(myscript.py:53)
        at <python>.chaquopy_java.call(chaquopy_java.pyx:380)
        at <python>.chaquopy_java.Java_com_chaquo_python_PyObject_callAttrThrowsNative(chaquopy_java.pyx:352)
        at com.chaquo.python.PyObject.callAttrThrowsNative(Native Method)
        at com.chaquo.python.PyObject.callAttrThrows(PyObject.java:232)
        at com.chaquo.python.PyObject.callAttr(PyObject.java:221)
        at com.example.pbl4_importpython.MainActivity.onCreate(MainActivity.java:39)
        at android.app.Activity.performCreate(Activity.java:7136)
        at android.app.Activity.performCreate(Activity.java:7127)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:193) 
        at android.app.ActivityThread.main(ActivityThread.java:6669) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 

Answer 1

Android应用程序无法直接访问计算机的文件系统，即使它在模拟器中运行。因此，尝试将其保存到应用程序的files目录中，如查克比文献中所述

os.environ["HOME"]设置为应用程序的内部存储目录。在此位置创建的任何文件或子目录都将持续到应用程序卸载为止。 如果您的应用程序是可调，您也可以使用设备文件资源管理器从Android读取和写入这个目录。它的路径将类似于/data/data/your.application.id/files。