Tutorial by Examples: w

A deadlock is what occurs when two or more threads are waiting for eachother to complete or to release a resource in such a way that they wait forever. If thread1 holds a lock on resource A and is waiting for resource B to be released while thread2 holds resource B and is waiting for resource A to ...

To draw a vector SVG image, the operation is not different from a raster image : You first need to load your SVG image into an HTMLImage element, then use the drawImage() method. var image = new Image(); image.onload = function(){ ctx.drawImage(this, 0,0); } image.src = "someFile.SVG&...

This is a nice trick to add a link to code, so it will be easy to jump to the code that issued the log. With the following code, this call: MyLogger.logWithLink("MyTag","param="+param); Will result in: 07-26...012/com.myapp D/MyTag: MyFrag:onStart(param=3) (MyFrag.java:236...

If you need to clean the build: ndk-build clean

Starting a File Chooser Activity public void showFileChooser() { Intent intent = new Intent(Intent.ACTION_GET_CONTENT); // Update with mime types intent.setType("*/*"); // Update with additional mime types here using a String[]. intent.putExtra(Intent.EXTRA_M...

Sometimes you need to determine the target of a symlink. os.readlink will do this: print(os.readlink(path_to_symlink))

A lambda closure is created when a lambda expression references the variables of an enclosing scope (global or local). The rules for doing this are the same as those for inline methods and anonymous classes. Local variables from an enclosing scope that are used within a lambda have to be final. Wit...

Middleware (also called pre and post hooks) are functions which are passed control during execution of asynchronous functions. Middleware is specified on the schema level and is useful for writing plugins. Mongoose 4.0 has 2 types of middleware: document middleware and query middleware. Document mid...

SELECT is used to retrieve rows of data from a table. You can specify which columns will be retrieved: SELECT Name, Position FROM Employees; Or just use * to get all columns: SELECT * FROM Employees;

This query will return all columns from the table sales where the values in the column amount is greater than 10 and the data in the region column in "US". SELECT * FROM sales WHERE amount > 10 AND region = "US" You can use regular expressions to select the columns you wan...

These are the bitwise operators in VB.NET : And, Or, Xor, Not Example of And bitwise operation Dim a as Integer a = 3 And 5 The value of a will be 1. The result is obtained after comparing 3 and 5 in binary for. 3 in binary form is 011 and 5 in binary form is 101. The And operator places 1 if ...

As of Qt 5.1 and later you can use QQmlApplicationEngine instead of QQuickView to load and render a QML script. With QQmlApplicationEngine you do need to use a QML Window type as your root element. You can obtain the root context from the engine where you can then add global properties to the cont...

A Cython pyx file needs to be translated to C code (cythonized) and compiled before it can be used from Python. A common approach is to create an extension module which is then imported in a Python program. Code For this example we create three files: hello.pyx contains the Cython code. test.p...

>>> df ID Year Jan_salary Feb_salary Mar_salary 0 1 2016 4500 4200 4700 1 2 2016 3800 3600 4400 2 3 2016 5500 5200 5300 >>> melted_df = pd.melt(df,id_vars=['ID','Year'], v...

Navigation Drawers are used to navigate to top-level destinations in an app. Make sure that you have added design support library in your build.gradle file under dependencies: dependencies { // ... compile 'com.android.support:design:25.3.1' } Next, add the DrawerLayout and Navigati...

Detailed instructions on getting mule set up or installed. Before going to start with mule we have to insure that java home is set. Mule CE runtime don't need installation. We have to just unzip the downloaded file and go to bin directory of mule runtime. In MS windows Operating system we have...

Why an Editor Window? As you may have seen, you can do a lot of things in a custom inspector (if you don't know what a custom inspector is, check the example here : http://www.riptutorial.com/unity3d/topic/2506/extending-the-editor. But at one point you may want to implement a configuration panel, ...

Here is a tested code for image and video.It will work for all APIs less than 19 and greater than 19 as well. Image: if (Build.VERSION.SDK_INT <= 19) { Intent i = new Intent(); i.setType("image/*"); i.setAction...

The Java Native Interface (JNI) allows you to call native functions from Java code, and vice versa. This example shows how to load and call a native function via JNI, it does not go into accessing Java methods and fields from native code using JNI functions. Suppose you have a native library named ...

You can add a "Browse Our Other Apps" button in your app, listing all your(publisher) applications in the Google Play Store app. String urlApp = "market://search?q=pub:Google+Inc."; String urlWeb = "http://play.google.com/store/search?q=pub:Google+Inc."; try { I...