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Can't create handler inside thread that has not called Looper.prepare()
...You're calling it from a worker thread. You need to call Toast.makeText() (and most other functions dealing with the UI) from within the main thread. You could use a handler, for example.
Look up Communicating with the UI Thread in the documentation. In a nutshell:
// Set this up in the UI thread....
Javascript call() & apply() vs bind()?
...fined will be replaced with the global object and primitive values will be converted to objects. So if you don't use this in the function it doesn't matter.
– Amit Shah
May 18 '18 at 18:46
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Create an empty list in python with certain size
...n do this to initialize a list with values from 0 to 9:
lst = range(10)
And in Python 3.x:
lst = list(range(10))
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Correct way to write line to file?
...d be to use:
f = open('myfile', 'w')
f.write('hi there\n') # python will convert \n to os.linesep
f.close() # you can omit in most cases as the destructor will call it
Quoting from Python documentation regarding newlines:
On output, if newline is None, any '\n' characters written are transl...
What is the use of hashCode in Java?
... distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java programming language.)
...
Thread vs ThreadPool
What is the difference between using a new thread and using a thread from the thread pool? What performance benefits are there and why should I consider using a thread from the pool rather than one I've explicitly created? I'm thinking specifically of .NET here, but general examples are fine.
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How to clear MemoryCache?
.... What is the quickest way to do this? Should I loop through all the items and remove them one at a time or is there a better way?
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What is the Swift equivalent of respondsToSelector?
...ional unwrapper operator. This allows you to call a method on an object if and only if the object exists (not nil) and the method is implemented.
In the case where you still need respondsToSelector:, it is still there as part of the NSObject protocol.
If you are calling respondsToSelector: on an O...
Generate .pem file used to set up Apple Push Notifications
...mmand for the generating 'apns' .pem file.
https://www.sslshopper.com/ssl-converter.html
command to create apns-dev.pem from Cert.pem and Key.pem
openssl rsa -in Key.pem -out apns-dev-key-noenc.pem
cat Cert.pem apns-dev-key-noenc.pem > apns-dev.pem
Above command is usefu...
How to extract one column of a csv file
...}
' c=3 < <(dos2unix <textfile.csv)
Note the use of dos2unix to convert possible DOS style line breaks (CRLF i.e. "\r\n") and UTF-16 encoding (with byte order mark) to "\n" and UTF-8 (without byte order mark), respectively. Standard CSV files use CRLF as line break, see Wikipedia.
If the...