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Save ArrayList to SharedPreferences
... list to preference
SharedPreferences prefs = getSharedPreferences(SHARED_PREFS_FILE, Context.MODE_PRIVATE);
Editor editor = prefs.edit();
try {
editor.putString(TASKS, ObjectSerializer.serialize(currentTasks));
} catch (IOException e) {
e.printStackTrace();
}
editor.commit();
}
...
Regular Expression for alphanumeric and underscores
...that contains only those characters (or an empty string), try
"^[a-zA-Z0-9_]*$"
This works for .NET regular expressions, and probably a lot of other languages as well.
Breaking it down:
^ : start of string
[ : beginning of character group
a-z : any lowercase letter
A-Z : any uppercase letter
0-...
Parallel foreach with asynchronous lambda
...ts and such.
– usr
Feb 28 '13 at 13:32
10
@usr The last example in Stephen Toub's article address...
Can table columns with a Foreign Key be NULL?
...NGINE=INNODB;
CREATE TABLE child (id INT NULL,
parent_id INT NULL,
FOREIGN KEY (parent_id) REFERENCES parent(id)
) ENGINE=INNODB;
INSERT INTO child (id, parent_id) VALUES (1, NULL);
-- Query OK, 1 row affected (0.01 sec)
INSERT INTO child (id, parent_id)...
Is there a MySQL option/feature to track history of changes to records?
...
For example, if you have a table like this:
CUSTOMER
---------
CUSTOMER_ID PK
CUSTOMER_NAME
CUSTOMER_ADDRESS
and you wanted to keep track over time, you would amend it as follows:
CUSTOMER
------------
CUSTOMER_ID PK
CUSTOMER_VALID_FROM PK
CUSTOMER_VALID_UNTIL PK
CUSTOMER_STAT...
Determine a string's encoding in C#
... following features:
Detection or attempted detection of UTF-7, UTF-8/16/32 (bom, no bom, little & big endian)
Falls back to the local default codepage if no Unicode encoding was found.
Detects (with high probability) unicode files with the BOM/signature missing
Searches for charset=xyz and en...
What does f+++++++++ mean in rsync logs?
...Mark MitchellJohn Mark Mitchell
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1
...
Most efficient T-SQL way to pad a varchar on the left to a certain length?
...en for the programmer to make use of it!
– underscore_d
Mar 23 '18 at 14:25
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...
Difference between class and type
...al types are byte, short, int, and long, whose values are
8-bit, 16-bit, 32-bit and 64-bit signed two's-complement integers,
respectively, and char, whose values are 16-bit unsigned integers
representing UTF-16 code units (§3.1).
b) The floating-point types are float, whose values includ...
What exactly does += do in python?
...
In Python, += is sugar coating for the __iadd__ special method, or __add__ or __radd__ if __iadd__ isn't present. The __iadd__ method of a class can do anything it wants. The list object implements it and uses it to iterate over an iterable object appending each...