Tutorial by Examples: w

The Just-In-Time (JIT) compiler is a component of the Java™ Runtime Environment that improves the performance of Java applications at run time. Java programs consists of classes, which contain platform-neutral bytecodes that can be interpreted by a JVM on many different computer architectures...

TL; DR: CoffeeScript switch statements use when for each case and else for the default case. They use then for one-line cases and commas for multiple cases with a single outcome. They intentionally disallow fallthrough and so don't need an explicit break (since it's always there implicitly). A switc...

Less allows the usage of the parent selector (&) anywhere in a complex selector and thus allows changing styles when the current element is within another element which gives it a different context: For example, in the below code the parent selector is placed at the end and thus it actually be...

You want to add a signature to a PDF in a way that a standard conform PDF viewer (e.g. Adobe Reader) will recognize, display, and validate as an integrated PDF signature. In that case you cannot simply externally create a signature covering the original PDF as is and expect to now have to merely so...

Functions are found by first collecting a set of "associated classes" and "associated namespaces" that include one ore more of the following, depending on the argument type T. First, let us show the rules for classes, enumeration and class template specialization names. If T i...

This example demonstrates how you can respond to a button click by performing some work on a worker thread and then update the user interface to indicate completion void MyButton_OnClick(object sender, EventArgs args) { Task.Run(() => // Schedule work using the thread pool { ...

<Image x:Name="MyImage" /> // Show image from web MyImage.Source = new BitmapImage(new Uri("http://your-image-url.com")) // Show image from solution MyImage.Source = new Uri("ms-appx:///your-image-in-solution", UriKind.Absolute) // Show image from file ...

<TextBlock x:Name="MyControl" Text="Hello, world!" /> var rtb = new RenderTargetBitmap(); await rtb.RenderAsync(MyControl); // Render control to RenderTargetBitmap // Get pixels from RTB IBuffer pixelBuffer = await rtb.GetPixelsAsync(); byte[] pixels = ...

public static async Task<IRandomAccessStream> ConvertWriteableBitmapToRandomAccessStream(WriteableBitmap writeableBitmap) { var stream = new InMemoryRandomAccessStream(); BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, stream); Stream pixe...

A while loop is used to execute a piece of code while a condition is true. The while loop is to be used when a block of code is to be executed a variable number of times. For example the code shown gets the user input, as long as the user inserts numbers which are not 0. If the user inserts 0, the ...

The pipe (%>%) operator could be used in combination with dplyr functions. In this example we use the mtcars dataset (see help("mtcars") for more information) to show how to sumarize a data frame, and to add variables to the data with the result of the application of a function. librar...

Writing with roxygen2 roxygen2 is a package created by Hadley Wickham to facilitate documentation. It allows to include the documentation inside the R script, in lines starting by #'. The different parameters passed to the documentation start with an @, for example the creator of a package will by...

Copy and Paste following class in your package: public class MLRoundedImageView extends ImageView { public MLRoundedImageView(Context context) { super(context); } public MLRoundedImageView(Context context, AttributeSet attrs) { super(context, attrs); } ...

nrs = [1, 2, 3, 4, 5, 6, 7, 8, 9] lets = ['a', 'b', 'c', 'd', 'e', 'f'] println GroovyCollections.transpose([nrs, lets]) .collect {le -> [(le[0]):le[1]]}.collectEntries { it } or println [nrs,lets].transpose().collectEntries{[it[0],it[1]]} // [1:a, 2:b, 3:c, 4:d, 5:e, 6:f...

Android allows programmers to place images at all four corners of a TextView. For example, if you are creating a field with a TextView and at same time you want to show that the field is editable, then developers will usually place an edit icon near that field. Android provides us an interesting opt...

ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo Info = cm.getActiveNetworkInfo(); if (Info == null || !Info.isConnectedOrConnecting()) { Log.i(TAG, "No connection"); } else { ...

To check exact strength in decibels use this- ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo Info = cm.getActiveNetworkInfo(); if (Info == null || !Info.isConnectedOrConnecting()) { Log.i(TAG, "No connection");...

Here is a generic ViewHolder class that you can use with any DataBinding layout. Here an instance of particular ViewDataBinding class is created using the inflated View object and DataBindingUtil utility class. import android.databinding.DataBindingUtil; import android.support.v7.widget.RecyclerVi...

It's good practice to mark some warnings in your code. For example, some deprecated methods is need for your testing, or old support version. But Lint checking will mark that code with warnings. For avoiding this problem, you need use annotation @SuppressWarnings. For example, add ignoring to warni...

You can communicate two activities so that Activity A can be notified of an event happening in Activity B. Activity A final String eventName = "your.package.goes.here.EVENT"; @Override protected void onCreate(Bundle savedInstanceState) { registerEventReceiver(); super.onCre...