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使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...etecting rotation gestures. You can download the apk file of the demo app from here. The demo app simply illustrates how to use the RotationDetector component to rotate an ImageSprite on canvas. The Designer view and block view of this demo app are shown below.
Here’s how to implement the r...
CSS Pseudo-classes with inline styles
...; the same set of statements that appears in each ruleset in a stylesheet. From the Style Attributes spec:
The value of the style attribute must match the syntax of the contents of a CSS declaration block (excluding the delimiting braces), whose formal grammar is given below in the terms and conven...
pretty-print JSON using JavaScript
...is great if you have an object you want pretty printed. If you're starting from a valid JSON string that you want to pretty printed, you need to convert it to an object first:
var jsonString = '{"some":"json"}';
var jsonPretty = JSON.stringify(JSON.parse(jsonString),null,2);
This builds a JSON ...
onIabPurchaseFinished never called.
...d the same issue and the onActivityResult was not called either.
Inspired from @Ghulam's answer I realized that the activity onActivityResult doesn't call the fragment's onActivityResult automatically so I had to do it
manually.
@Override
protected void onActivityResult(int requestCode, int r...
Deploying just HTML, CSS webpage to Tomcat
...
There is no real need to create a war to run it from Tomcat. You can follow these steps
Create a folder in webapps folder e.g. MyApp
Put your html and css in that folder and name the html file, which you want to be the starting page for your application, index.html
Start...
How to convert a factor to integer\numeric without loss of information?
...
The most easiest way would be to use unfactor function from package varhandle
unfactor(your_factor_variable)
This example can be a quick start:
x <- rep(c("a", "b", "c"), 20)
y <- rep(c(1, 1, 0), 20)
class(x) # -> "character"
class(y) # -> "numeric"
x <- fa...
How can I view all historical changes to a file in SVN
...
Slightly different from what you described, but I think this might be what you actually need:
svn blame filename
It will print the file with each line prefixed by the time and author of the commit that last changed it.
...
In pure functional languages, is there an algorithm to get the inverse function?
...+ B1 : ls
Up to that point, at least one of the g j is indistinguishable from f, and since inv f hadn't done either of these evaluations, inv could not possibly have told it apart – short of doing some runtime-measurements on its own, which is only possible in the IO Monad.
...
How does Rails keep track of which migrations have run for a database?
.... If you roll back that migration, Rails will delete the corresponding row from schema_migrations.
For example, running a migration file named 20120620193144_create_users.rb will insert a new row with a version of 20120620193144 into the schema_migrations table.
You are free at any point to introd...
Indentation in Go: tabs or spaces?
...y
gofmt -w .
You can read more about it here on the golang.org blog, or from the Effective go document:
Indentation
We use tabs for indentation and gofmt emits them by default. Use spaces only if you must.
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