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Difference between Activity and FragmentActivity

I was working on fragments and came across two things Activity and FragmentActivity which are used several times. I want to know that is there any difference between these two, because when I changed Activity with FragmentActivity , it had no effect on the app. ...
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How to change past commit to include a missed file?

I have committed a change and forgot to add a file to the change set. After other commits, I realized the file is now missing from a HEAD^4 commit. ...
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How to recursively download a folder via FTP on Linux [closed]

I'm trying to ftp a folder using the command line ftp client, but so far I've only been able to use 'get' to get individual files. ...
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How to measure time taken between lines of code in python?

...f you want to measure CPU time, can use time.process_time() for Python 3.3 and above: import time start = time.process_time() # your code here print(time.process_time() - start) First call turns the timer on, and second call tells you how many seconds have elapsed. There is also a function t...
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Singletons vs. Application Context in Android?

Recalling this post enumerating several problems of using singletons and having seen several examples of Android applications using singleton pattern, I wonder if it's a good idea to use Singletons instead of single instances shared through global application state (subclassing android.os.Applicat...
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How to move an iFrame in the DOM without losing its state?

...s related to the bounty by @djechlin A lot of search on the w3/dom specs and didn't find anything final that specifically says that iframe should be reloaded while moving in the DOM tree, however I did find lots of references and comments in the webkit's trac/bugzilla/microsoft regarding different...
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Task not serializable: java.io.NotSerializableException when calling function outside closure only o

...sk to fail. Now this doesn't mean that you can serialise an RDD with Spark and avoid NotSerializableException Spark is a distributed computing engine and its main abstraction is a resilient distributed dataset (RDD), which can be viewed as a distributed collection. Basically, RDD's elements are par...
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Should URL be case sensitive?

... According to W3's "HTML and URLs" they should: There may be URLs, or parts of URLs, where case doesn't matter, but identifying these may not be easy. Users should always consider that URLs are case-sensitive. ...
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How to append one file to another in Linux from the shell?

I have two files: file1 and file2 . How do I append the contents of file2 to file1 so that contents of file1 persist the process? ...
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Scrollview vertical and horizontal in android

I'm really tired looking for a solution for vertical and horizontal Scrollview. 11 Answers ...