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How to make an app's background image repeat
I have set a background image in my app, but the background image is small and I want it to be repeated and fill in the whole screen. What should I do?
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JPA: unidirectional many-to-one and cascading delete
...cade REMOVE operations so that EntityManager.remove will remove the parent and the children. You can also specify orphanRemoval as true, to delete any orphaned children when the child entity in the parent collection is set to null, i.e. remove the child when it is not present in any parent's collect...
Hash Map in Python
... The second example just builds a dict in the same ways as before and then copies it. The other use dict, which would be more appopriate in this context, is dict(key1=value1, key2=value2, ...) but that requires the keys to strings which are also valid Python identifiers (and internally, thi...
Select rows which are not present in other table
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There are basically 4 techniques for this task, all of them standard SQL.
NOT EXISTS
Often fastest in Postgres.
SELECT ip
FROM login_log l
WHERE NOT EXISTS (
SELECT -- SELECT list mostly irrelevant; can just be empty in Postgres
FROM ip_location
WHERE ip = l.ip
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Python Pandas merge only certain columns
...e to only merge some columns? I have a DataFrame df1 with columns x, y, z, and df2 with columns x, a ,b, c, d, e, f, etc.
5...
How can I make a div not larger than its contents?
...nter the parent of the table by setting "text-align:center" on it's parent and "text-align:left" on it (e.g. <body style="text-align:center"><span style="text-align:left; display:inline-block;"><table>...</table></span></body>)
– bernstein
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How to log a method's execution time exactly in milliseconds?
...Since(methodStart)
print("Execution time: \(executionTime)")
Easy to use and has sub-millisecond precision.
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Authorative way to override onMeasure()?
...ding onMeasure()? I've seen various approaches. For example, Professional Android Development uses MeasureSpec to calculate the dimensions, then ends with a call to setMeasuredDimension(). For example:
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Install gitk on Mac
...re/commit/dfa3ccf1e7d3901e371b5140b935839ba9d8b706)
Run the following commands at the terminal:
brew update
brew install git
brew install git-gui
If you get an error indicating it could not link git, then you may need to change permissions/owners of the files it mentions.
Once completed, run:
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How to properly import a selfsigned certificate into Java keystore that is available to all Java app
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On Windows the easiest way is to use the program portecle.
Download and install portecle.
First make 100% sure you know which JRE or JDK is being used to run your program. On a 64 bit Windows 7 there could be quite a few JREs. Process Explorer can help you with this or you can use: System.out...