Tutorial by Examples: n

For most GNU/Linux distributions, a version of GnuCOBOL is available in the repositories. GnuCOBOL was originally OpenCOBOL, rebranded when the project became an official GNU project. Many repositories are still using open-cobol as the package name (as of August 2016). For Fedora, and other RPM b...

By going to Settings >> Keymap A window will popup showing All the Editor Actions with the their name and shortcuts. Some of the Editor Actions do not have shortcuts. So right click on that and add a new shortcut to that. Check the image below

Problem: If after the AsyncTask starts there is a screen rotation the owning activity is destroyed and recreated. When the AsyncTask finishes it wants to update the UI that may not valid anymore. Solution: Using Loaders, one can easily overcome the activity destruction/recreation. Example: ...

When a Google Map is displayed in lite mode clicking on a map will open the Google Maps application. To disable this functionality you must call setClickable(false) on the MapView, e.g.: final MapView mapView = (MapView)view.findViewById(R.id.map); mapView.setClickable(false);

com.android.dex.DexException: Multiple dex files define Lcom/example/lib/Class; This error occurs because the app, when packaging, finds two .dex files that define the same set of methods. Usually this happens because the app has accidentally acquired 2 separate dependencies on the same library....

public class PlaySound extends Activity implements OnTouchListener { private SoundPool soundPool; private int soundID; boolean loaded = false; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { su...

To ignore a test, simply add the @Ignore annotation to the test and optionally provide a parameter to the annotation with the reason. @Ignore("Calculator add not implemented yet.") @Test public void testPlus() { assertEquals(5, calculator.add(2,3)); } Compared to commenting the...

A spring bean can be configured such that it will register only if it has a particular value or a specified property is met. To do so, implement Condition.matches to check the property/value: public class PropertyCondition implements Condition { @Override public boolean matches(ConditionC...

Find meaningful names for computation units. Use for comprehensions or map to combine computations together. Let's say you have something like this: if (userAuthorized.nonEmtpy) { makeRequest().map { case Success(respone) => someProcessing(..) if (resendToUser) { ...

By default: Use val, not var, wherever possible. This allows you to take seamless advantage of a number of functional utilities, including work distribution. Use recursion and comprehensionss, not loops. Use immutable collections. This is a corrolary to using val whenever possible. Focus on da...

This example shows a white Snackbar with custom Undo icon. Snackbar customBar = Snackbar.make(view , "Text to be displayed", Snackbar.LENGTH_LONG); customBar.setAction("UNDO", new View.OnClickListener() { @Override public void onClick(View view) { //Put the logic...

For signing to work you need a default GPG key configured. You can turn it on or off as follows: npm config set sign-git-tag <true or false>

Say we have Products and Categorys in a many-to-many relationship: public class Product { public Product() { Categories = new HashSet<Category>(); } public int ProductId { get; set; } public string ProductName { get; set; } public virtual ICollection&lt...

There is no format specifier to print boolean type using NSLog. One way to print boolean value is to convert it to a string. BOOL boolValue = YES; NSLog(@"Bool value %@", boolValue ? @"YES" : @"NO"); Output: 2016-07-30 22:53:18.269 Test[4445:64129] Bool value YES ...

The Fibonacci numbers are defined inductively as F0 = 0 F1 = 1 Fn+2 = Fn + Fn+1 The sum of the first n+1 Fibonacci numbers is given by F0 + F1 + F2 + ... + Fn = Fn+2 - 1. This summation arises, among other places, in the analysis of Fibonacci heaps, where it's used to provide a lower b...

You can animate complex changes to your collection view using the performBatchUpdates method. Inside the update block, you can specify several modifications to have them animate all at once. collecitonView.performBatchUpdates({ // Perform updates }, nil) Inside the update block, you can pe...

Before starting with the example I'd recommend to create a Singleton with a delegate class member so you could achieve a use case of uploading a file in the background and let the user keep using your app while the files are being uploaded even when the app is the background. Let's start, first, we...

If all you need is to wrap the value into a promise, you don't need to use the long syntax like here: //OVERLY VERBOSE var defer; defer = $q.defer(); defer.resolve(['one', 'two']); return defer.promise; In this case you can just write: //BETTER return $q.when(['one', 'two']); $q.when ...

Pressing C-h a will run the emacs function apropos-command which makes emacs prompt for words (or a regexp) to search for. It will then show a buffer containing a list of names and descriptions related to that topic, including key bindings for each of the functions available via keystrokes. Pressin...

C-h k runs the function describe-key, which looks up the function mapped to the key strokes provided, and presents a description of the function which will be run when these keys are pressed. C-h c runs the function describe-key-briefly, which only displays the function name mapped to given key seq...