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在 App Inventor 2 中使用图像 · App Inventor 2 中文网
...”
Determining the size of the image on the screen
Details on fixed vs. responsive sizing
In summary: What MIT App Inventor Programmers Should Do
Synopsis: App Inventor works best if you use images whose size matches the size you want them to appear on your screen...
How do you disable viewport zooming on Mobile Safari?
... 4.2.
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
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How to use a decimal range() step value?
...numpy.arange.
>>> import numpy as np
>>> np.arange(0.0, 1.0, 0.1)
array([ 0. , 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9])
Floating-point rounding error will cause problems, though. Here's a simple case where rounding error causes arange to produce a length-4 array wh...
“The underlying connection was closed: An unexpected error occurred on a send.” With SSL Certificate
...transported is truly sensitive). To prefer TLS 1.2 but still allow 1.1 and 1.0, you have to OR them: ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
– Dusty
Mar 17 '17 at 17:33
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Can't use NVM from root (or sudo)
...cannot operate on dangling symlink ‘/home/ec2-user/.nvm/versions/node/v7.1.0/bin/node-debug’ chmod: cannot operate on dangling symlink ‘/home/ec2-user/.nvm/versions/node/v7.1.0/bin/node-inspector’
– trex005
Nov 14 '16 at 20:23
...
Set EditText cursor color
...or"
/>
Then create drawalble xml: color_cursor
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<size android:width="3dp" />
<solid android:color="#FFFFFF" />
</shape>
You have a white color ...
Store boolean value in SQLite
...
sqlite> INSERT INTO foo VALUES(0.0);
sqlite> INSERT INTO foo VALUES(1.0);
sqlite> INSERT INTO foo VALUES("0.0");
sqlite> INSERT INTO foo VALUES("1.0");
sqlite> select mycolumn, typeof(mycolumn) from foo;
0|integer
1|integer
0|integer
1|integer
0|integer
1|integer
and some that will...
What is the difference between graph search and tree search?
...n
}
return next
Depending on how you implement select from open, you obtain different variants of search algorithms, like depth-first search (DFS) (pick newest element), breadth first search (BFS) (pick oldest element) or uniform cost search (pick element with lowest path cost), the popular A-sta...
Retrieving Android API version programmatically
...true;
}
Obviously, you can modify that if condition to take into account 1.0 & 1.5 versions of Android in case you need generic checker. You will probably end up with something like this:
// returns true if current Android OS on device is >= verCode
public static boolean androidMinimum(in...
Hide separator line on one UITableViewCell
...atorBGColor;
separatorY = cell.frame.size.height;
separatorHeight = (1.0 / [UIScreen mainScreen].scale); // This assures you to have a 1px line height whatever the screen resolution
separatorWidth = cell.frame.size.width;
separatorInset = 15.0f;
separatorBGColor = [UIColor colorWithRed: 20...