kivy screenmanager

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition

class MainScreen(Screen):
    pass

class AnotherScreen(Screen):
    pass

class ScreenManagement(ScreenManager):
    pass

presentation = Builder.load_file("test.kv")

class MainApp(App):
    def build(self):
        return presentation

MainApp().run()



ScreenManagement:
  #  transition: FadeTransition()
    MainScreen:
    AnotherScreen:

:
    name: 'main'

    Button:
        on_release: app.root.current = 'other'
        text: 'Another Screen'
        font_size: 50
            
:
    name: 'other'

    Button:
        on_release: app.root.current = 'main'
        text: 'back to the home screen'
        font_size: 50

certificates Android

Sign an apk
java -jar out/host/linux-x86/framework/signapk.jar -w .x509.pem .pk8 app_name.apk app_name-signed.apk

How can I check that an Android apk is signed with a release and not debug cert?
$ jarsigner -verify -verbose -certs my_application.apk

.509.pem is the Certificate
.pk8 is the hash

content of a pem file
$ openssl x509 -in acs.qacafe.com.pem -text



jar -xvf ../foo.jar
cd META-INF
openssl pkcs7 -in TEST.RSA -print_certs -inform DER -out foo.cer


keytool -printcert -file ANDROID_.RSA
keytool -list -keystore my-signing-key.keystore

Touch Settings > Personal > Security > Credential storage > Trusted credentials. The trusted credentials screen has two tabs:

System displays certificate authority (CA) certificates that are permanently installed in the ROM of your phone.

User displays any CA certificates that you have installed yourself, for example in the process of installing a client certificate.

etags emacs

make a  python TAG file
Type in the current project directory:

find . -name "*.py" -print | tags -

For c code

find . -name '*.c' -exec etags -a {} \;

TAGS in the current directory.


in emacs:

loadfile tags
M-x visit-tags-table. This allows you to have different databases for different projects. To look up a definition, just type  
M-., then enter up a definition

NFC hacking

links
http://korben.info/wp-content/uploads/defcon/SpeakerPresentations/Lee/DEFCON-20-Lee-NFC-Hacking.pdf

python setup.py cython

Content of setup.py


from setuptools import setup, find_packages,Extension, Command

try:
    from Cython.Distutils import build_ext
except ImportError:
    from distutils.command.build_ext import build_ext
    sources=['midistream.c']
else:
    sources=['midistream.pyx']

setup(
    name ='midistream',
    version='1.0',
    packages=find_packages(),
    cmdclass = {'build_ext': build_ext},
    ext_modules=[
    Extension('midistream', ['midistream.pyx'])
    ],
   
)


Rename midistream.py midistream.pyx 

run:

sudo python setup.py build_ext --inplace

sudo python setup.py install

midistream.o and midistream.so are made

emacs packages

 in scratch press C-j

install el-get

(url-retrieve
 "https://raw.githubusercontent.com/dimitri/el-get/master/el-get-install.el"
 (lambda (s)
   (goto-char (point-max))
   (eval-print-last-sexp)))

kivy / python game server handling high score

server.py:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

import SocketServer import json class MyTCPServer(SocketServer.ThreadingTCPServer):     allow_reuse_address = True class MyTCPServerHandler(SocketServer.BaseRequestHandler):     def handle(self):         try:             data = json.loads(self.request.recv(1024).strip())             # process the data, i.e. print it:             print data             # send some 'ok' back             self.request.sendall(json.dumps({'return':'ok'}))         except Exception, e:             print "Exception wile receiving message: ", e server = MyTCPServer(('127.0.0.1', 13370), MyTCPServerHandler) server.serve_forever()

kivy client.py:

1 2 3 4 5 6 7 8 9 10 11

import socket import json def send_data(score):   data = {'message':'This is my kivy app', 'score':score}   s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)   s.connect(('127.0.0.1', 13370))   s.send(json.dumps(data))   result = json.loads(s.recv(1024))   print result   s.close()

buildozer.spec
# (list) Permissions
android.permissions = INTERNET

emacs packages

For a specific package

Where to place the el file

After placing it, say myplugin.el to your ~/.emacs.d/ directory, add the following in your .emacs file:

(add-to-list 'load-path "~/.emacs.d/")
(load "myplugin.el")

Also, in many cases you would need the following instead of the second line:

(require 'myplugin)

for normal emacs packages 

add to init.el

(when (>= emacs-major-version 24)
  (require 'package)
  (add-to-list
   'package-archives
   '("melpa" . "http://melpa.org/packages/")
   t)

  (package-initialise))


In emacs type: MetaX list-packages.

sonic pi short reference

3.times { puts "Hello!" } Hello [0.5, 2, 1, 4].choose play_pattern_timed [59,64,68],[0.5] play 59,sleep .5 play 64 sleep .5