在android上运行django

    这里是一个在android上运行django的例子，通常django是从命令行运行的，如果在android中运行，需要从java代码中加载python解释器，运行django脚本，需要修改一下django的启动参数。

    该例子使用python2.7，首先需要提取django，在windows中安装diango，安装完成之后，打包目录“\Lib\site-ackages\Django-1.10.5-py2.7.egg\django”为一个zip，放到android工程的assets目录下面；创建mysite站点，将站点打包成为mysite.zip，放到android工程的assets目录下面。

1. 创建工程

   该例子代码使用eclipse开发，可以直接导入到android studio中。

   在libs目录下添加共享库文件：

   

    在assets目录下添加python扩展库，django.zip和mysite.zip

   

2. 修改django

Django加载需要一定时间，加载完成之后通知界面，需要设置共享变量MainActivity，该变量提供函数OnDJangoInitFinish，函数由java编写，可以由python调用。创建一个空的python module文件” starglobal.py”管理python变量

   

public void OnDJangoInitFinish() { Message message = handler.obtainMessage(); message.what = 0; message.obj = null; handler.sendMessage(message); }     修改 runserver.py, 在 django\ core\management\commands 目录下 def inner_run(self, *args, **options): …. try: import starglobal starglobal.MainActivity.OnDJangoInitFinish() # notify host handler = self.get_handler(*args, **options) run(self.addr, int(self.port), handler, ipv6=self.use_ipv6, threading=threading)     修改站点的 manage.py ， django 加载之后会进入循环，因此为了避免阻止界面线程，在 python 中创建一个线程运行。在 manage.py 运行最后，进入 cle 的消息循环，界面创建一个线程初始化并加载 django 。 #!/usr/bin/env python import os import sys import traceback import thread import time def doit(val): os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mysite.settings") try: from django.core.management import execute_from_command_line except ImportError: # The above import may fail for some other reason. Ensure that the # issue is really that Django is missing to avoid masking other # exceptions on Python 2. try: import django except ImportError: traceback.print_exc() raise ImportError( "Couldn't import Django. Are you sure it's installed and " "available on your PYTHONPATH environment variable? Did you " "forget to activate a virtual environment?" ) raise execute_from_command_line(['manage.py', 'runserver','--noreload']) if __name__ == "__main__": try: import starglobal starglobal.MainActivity = MainActivity thread.start_new_thread(doit,(0,)) while True : while libstarpy._SRPDispatch(False) == True : pass libstarpy._SRPUnLock() time.sleep(0.01) libstarpy._SRPLock() except Exception : traceback.print_exc()

3. 初始化python解释器，加载Django

a.将python2.7.zip拷贝到"/data/data/"+getPackageName()+"/files"目录下

File destDir = new File("/data/data/"+getPackageName()+"/files"); if(!destDir.exists()) destDir.mkdirs(); java.io.File python2_7_libFile = new java.io.File("/data/data/"+getPackageName()+"/files/python2.7.zip"); if( !python2_7_libFile.exists() ){ try{ copyFile(this,"python2.7.zip",null); } catch(Exception e){ } }

b. 将django.zip和mysite.zip解压到"/data/data/"+getPackageName()+"/files"目录下

try{ AssetManager assetManager = getAssets(); InputStream dataSource = assetManager.open("django.zip"); unzip(dataSource, "/data/data/"+getPackageName()+"/files",false ); dataSource.close(); dataSource = assetManager.open("mysite.zip"); unzip(dataSource, "/data/data/"+getPackageName()+"/files",false ); } catch(Exception e) { }

c. 将django运行需要加载的python扩展库拷贝到"/data/data/"+getPackageName()+"/files"目录下

try{ copyFile(this,"zlib.so",null); copyFile(this,"_json.so",null); copyFile(this,"_random.so",null); copyFile(this,"_socket.so",null); copyFile(this,"_sqlite3.so",null); copyFile(this,"select.so",null); copyFile(this,"time.so",null); copyFile(this,"unicodedata.so",null); copyFile(this,"datetime.so",null); copyFile(this,"fcntl.so",null); copyFile(this,"_struct.so",null); copyFile(this,"binascii.so",null); copyFile(this,"_collections.so",null); copyFile(this,"operator.so",null); copyFile(this,"itertools.so",null); copyFile(this,"_functools.so",null); copyFile(this,"math.so",null); copyFile(this,"_io.so",null); copyFile(this,"cStringIO.so",null); copyFile(this,"_hashlib.so",null); copyFile(this,"array.so",null); copyFile(this,"cPickle.so",null); } catch(Exception e){ System.out.println(e); } d. 初始化 cle 和 python 解释器，设置模块搜索路径，加载 manage.py /*----init starcore----*/ StarCoreFactoryPath.StarCoreCoreLibraryPath = this.getApplicationInfo().nativeLibraryDir; StarCoreFactoryPath.StarCoreShareLibraryPath = this.getApplicationInfo().nativeLibraryDir; StarCoreFactoryPath.StarCoreOperationPath = "/data/data/"+getPackageName()+"/files"; final String LibPath = this.getApplicationInfo().nativeLibraryDir; final Activity GActivity = this; new Thread(new Runnable(){ @Override public void run() { StarCoreFactory starcore= StarCoreFactory.GetFactory(); StarServiceClass Service=starcore._InitSimple("test","123",0,0); StarSrvGroupClass SrvGroup = (StarSrvGroupClass)Service._Get("_ServiceGroup"); Service._CheckPassword(false); /*----run python code----*/ SrvGroup._InitRaw("python",Service); StarObjectClass python = Service._ImportRawContext("python","",false,""); python._Call("import", "sys"); StarObjectClass pythonSys = python._GetObject("sys"); StarObjectClass pythonPath = (StarObjectClass)pythonSys._Get("path"); pythonPath._Call("insert",0,"/data/data/"+getPackageName()+"/files/python2.7.zip"); pythonPath._Call("insert",0,LibPath); pythonPath._Call("insert",0,"/data/data/"+getPackageName()+"/files"); pythonPath._Call("insert",0,"/data/data/"+getPackageName()+"/files/django"); pythonPath._Call("insert",0,"/data/data/"+getPackageName()+"/files/mysite"); python._Set("MainActivity", GActivity); Service._DoFile("python", "/data/data/"+getPackageName()+"/files/mysite/manage.py", ""); } }).start();

4.运行结果和实例下载

       也可以将 django 和 mysite 放在 sd 卡上，此时模块的搜索路径需要相应修改    示例下载