大约有 40,000 项符合查询结果（耗时：0.0693秒） [XML]
SharedPreferences.onSharedPreferenceChangeListener not being called consistently
...s that you cannot use an anonymous inner class as a listener, as it will become the target of garbage collection as soon as you leave the current scope. It will work at first, but eventually, will get garbage collected, removed from the WeakHashMap and stop working.
Keep a reference to the listener...
Android - Back button in the title bar
...);
return true;
}
That's it!
(In the Android developers API, it recommends messing around with the manifest and adding stuff like android:parentActivityName. But that doesn't seem to work for me. The above is simpler and more reliable.)
<meta-data
android:name="android.support.PA...
How can I present a file for download from an MVC controller?
... This requires a file extension on the filename or otherwise it will completely ignore the filename and contenttype and just try to stream the file to the browser. It will also just use the webpage name if the browser doesn't recognize the contenttype (i.e. octet-stream) when it forces the do...
Dealing with multiple Python versions and PIP?
...
The current recommendation is to use python -m pip, where python is the version of Python you would like to use. This is the recommendation because it works across all versions of Python, and in all forms of virtualenv. For example:
# The...
Javascript Thousand Separator / string format [duplicate]
...er
According to this reference there isn't a built in function for adding commas to a number. But that page includes an example of how to code it yourself:
function addCommas(nStr) {
nStr += '';
var x = nStr.split('.');
var x1 = x[0];
var x2 = x.length > 1 ? '.' + x[1] : '';
...
Force browser to download image files on click
...e 'download' to your links.
<a href="/path/to/image.png" download>
Compliant browsers will then prompt to download the image with the same file name (in this example image.png).
If you specify a value for this attribute, then that will become the new filename:
<a href="/path/to/image.pn...
Capitalize first letter. MySQL
...change to use the CONCAT() function instead of the + operator :
UPDATE tb_Company
SET CompanyIndustry = CONCAT(UCASE(LEFT(CompanyIndustry, 1)),
SUBSTRING(CompanyIndustry, 2));
This would turn hello to Hello, wOrLd to WOrLd, BLABLA to BLABLA, etc. If you want to upper...
Detecting when user has dismissed the soft keyboard
...ur custom views (for when you subclass EditText):
http://developer.android.com/guide/topics/ui/custom-components.html
share
|
improve this answer
|
follow
|
...
Simplest code for array intersection in javascript
...
Use a combination of Array.prototype.filter and Array.prototype.includes:
array1.filter(value => array2.includes(value))
For older browsers, with Array.prototype.indexOf and without an arrow function:
array1.filter(function(...
How to test equality of Swift enums with associated values
...se the default statement in the switch, so if you add a new enum case, the compiler doesn't make sure you add the clause to compare that new case for equality – you'll just have to remember and be careful when you make changes later down the line!
– Michael Waterfall
...