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App Inventor 2 扩展 · App Inventor 2 中文网
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App Inventor 2 扩展
Initial Release 1.0 (Introduced as part of MIT App Inventor Release nb149)
DRAFT: September 27, 2015
Updated: June 9, 2017
Updated: May 17, 2021
sample extensions are at: MIT App Inventor Extension
source code for sample extensions at: ...
Can HTML checkboxes be set to readonly?
...data posted, your example does not do that.
– David Mårtensson
Feb 8 '12 at 16:59
71
...
“The page you are requesting cannot be served because of the extension configuration.” error message
I'm getting this error message when trying to run my application. I don't know how to fix it:
19 Answers
...
How to check for DLL dependency?
Sometimes when I'm doing a little project I'm not careful enough and accidentally add a dependency for a DLL that I am not aware of. When I ship this program to a friend or other people, "it doesn't work" because "some DLL" is missing. This is of course because the program can find the DLL on my sy...
How to check version of python modules?
...n serial, inspect, PyQt and SQLite? See pycmake.
– Pål GD
Jul 11 '16 at 8:30
5
print(contruct._...
How can I make Flexbox children 100% height of their parent?
...ndeed the best answer for this question.
– Øyvind Bråthen
Sep 12 '19 at 9:38
31
don't forget to...
Does a valid XML file require an XML declaration?
...le using Sax Parser of Xerces.
Is the XML declaration <?xml version="1.0" encoding="UTF-8"?> required?
3 Answers
...
Get current AUTO_INCREMENT value for any table
...answered Apr 4 '13 at 20:56
methaimethai
7,49711 gold badge1919 silver badges2020 bronze badges
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Show DialogFragment with animation growing from a point
...folder:
( the android:pivotY is the key )
anim_in.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<scale
android:interpolator="@android:anim/linear_interpolator"
android:fromXScale="0.0"
android...
Why doesn't Python have a sign function?
...just use copysign and forget about it.
>>> math.copysign(1, -4)
-1.0
>>> math.copysign(1, 3)
1.0
If you get sick of passing two whole arguments, you can implement sign this way, and it will still be compatible with the IEEE stuff mentioned by others:
>>> sign = functoo...