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