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Java Reflection: How to get the name of a variable?
..., here's an alternative (which I wouldn't use - see below):
public void printFieldNames(Object obj, Foo... foos) {
List<Foo> fooList = Arrays.asList(foos);
for(Field field : obj.getClass().getFields()) {
if(fooList.contains(field.get()) {
System.out.println(fiel...
Size of Matrix OpenCV
...
cv:Mat mat;
int rows = mat.rows;
int cols = mat.cols;
cv::Size s = mat.size();
rows = s.height;
cols = s.width;
Also note that stride >= cols; this means that actual size of the row can be greater than element size x cols. This is ...
How can I get every nth item from a List?
... Yes, I suppose it sort of depends what you mean by "nth," but your interpretation might be more common. Add or subtract from i to suit your needs.
– mqp
Mar 25 '09 at 17:39
...
What happens to C# Dictionary lookup if the key does not exist?
...ue if the key does exist, use Dictionary<TKey, TValue>.TryGetValue:
int value;
if (dictionary.TryGetValue(key, out value))
{
// Key was in dictionary; "value" contains corresponding value
}
else
{
// Key wasn't in dictionary; "value" is now 0
}
(Using ContainsKey and then the the ...
How to pass variable number of arguments to a PHP function
...
If you have your arguments in an array, you might be interested by the call_user_func_array function.
If the number of arguments you want to pass depends on the length of an array, it probably means you can pack them into an array themselves -- and use that one for the second ...
What do the parentheses around a function name mean?
...ence of any preprocessor stuff going on, foo's signature is equivalent to
int foo (int *bar)
The only context in which I've seen people putting seemingly unnecessary parentheses around function names is when there are both a function and a function-like macro with the same name, and the programme...
How to make part of the text Bold in android at runtime?
...e) {
SpannableStringBuilder sb = new SpannableStringBuilder(text);
int start = text.indexOf(spanText);
int end = start + spanText.length();
sb.setSpan(style, start, end, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
textView.setText(sb);
}
Use it in an Activity like so:
@Override
prote...
how to read value from string.xml in android?
...
String string = getString(R.string.hello);
You can use either getString(int) or getText(int) to retrieve a string. getText(int) will retain any rich text styling applied to the string.
Reference: https://developer.android.com/guide/topics/resources/string-resource.html
...
Java - sending HTTP parameters via POST method easily
...
byte[] postData = urlParameters.getBytes( StandardCharsets.UTF_8 );
int postDataLength = postData.length;
String request = "http://example.com/index.php";
URL url = new URL( request );
HttpURLConnection conn= (HttpURLConnection) url.openConnection();
conn.se...
Android - Camera preview is sideways
...s is how I implement it:
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if (isPreviewRunning) {
mCamera.stopPreview();
}
Parameters parameters = mCamera.getParameters();
Display display = ((WindowManager)getSystemService(WI...