Tutorial by Examples: d

Especially in a ListView, you can run into performance problems by doing too many findViewById() calls during scrolling. By using the ViewHolder pattern, you can save these lookups and improve your ListView performance. If your list item contains a single TextView, create a ViewHolder class to stor...

To delete our instance, reuse the os_server command with all authentication information and simply replace ' state: present' by ' state: absent'. $vi stop_compute.yml - name: launch a compute instance hosts: localhost gather_facts: False tasks: - name: Create and launch the VM os_...

send() is used to pass message to object. send() is an instance method of the Object class. The first argument in send() is the message that you're sending to the object - that is, the name of a method. It could be string or symbol but symbols are preferred. Then arguments those need to pass in met...

To create a new empty database, run as postgres-user: createdb [yourdatabase] Connect to the database with a psql-session: psql -d [yourdatabase] In the psql-session run: CREATE EXTENSION postgis; CREATE EXTENSION postgis_topology; to create the neccesary geospatial extensions. Once thi...

If you have PHP installed locally and you would like to use PHP's built-in development server to serve your application, you may use the serve Artisan command. This command will start a development server at http://localhost:8000: php artisan serve Of course, more robust local development option...

The basic example Open routes/web.php file and paste the following code in file: Route::get('helloworld', function () { return '<h1>Hello World</h1>'; }); here 'helloworld' will act as page name you want to access, and if you don't want to create blade file and still want to ...

Open routes file. Paste the following code in: Route::get('helloworld', function () { return '<h1>Hello World</h1>'; }); after going to route http://localhost/helloworld it displays Hello World. The routes file is located /routes/web.php

Accessing pages and outputting data is fairly easy in Laravel. All of the page routes are located in app/routes.php. There are usually a few examples to get you started, but we're going to create a new route. Open your app/routes.php, and paste in the following code: Route::get('helloworld', functi...

Bullet This one particularly blew my mind. The bullet gem helps you kill all the N+1 queries, as well as unnecessarily eager loaded relations. Once you install it and start visiting various routes in development, alert boxes with warnings indicating database queries that need to be optimized will p...

In this example we will set up a geospatial database, import data from 2 different sources, and view the results in an application called QGIS. This guide is explicitly written for linux-machines, if you operate on another platform, some commands or paths might not work as expected. In order to vie...

If you want a title screen or an endgame screen, consider setting up a mode switching mechanism: function _init() mode = 1 end function _update() if (mode == 1) then if (btnp(5)) mode = 2 elseif (mode == 2) then if (btnp(5)) mode = 3 end end function _draw() cls() ...

Along with other more advanced text editors, Atom allows developers to open a single file or a directory. Opening Files To open files with Atom, either use File > Open File... in the menu as show below: or use the faster keyboard shortcut: Ctrl+O (For Mac OS: ⌘+O). This will open a file expl...

TypeScript supports interfaces, but the compiler outputs JavaScript, which doesn't. Therefore, interfaces are effectively lost in the compile step. This is why type checking on interfaces relies on the shape of the object - meaning whether the object supports the fields and functions on the interfac...

Requirements Windows 10, please set your system locale to English, otherwise there may be errors Visual Studio 2013 or 2015 QtWebEngine 5.7 source code (could be downloaded from here) Qt 5.7 install version, install it and add qmake.exe folder to system path Python 2, add python.exe folder to...

const { remote } = require("electron"); // <- The Node.js require() function is // added to JavaScript by electron function fullscreen(f) { // p = false or true const currentWindow = remote.getCurrentWindow(); currentWindow.maximize(); } ...

Query to search last executed sp's in db SELECT execquery.last_execution_time AS [Date Time], execsql.text AS [Script] FROM sys.dm_exec_query_stats AS execquery CROSS APPLY sys.dm_exec_sql_text(execquery.sql_handle) AS execsql ORDER BY execquery.last_execution_time DESC Query to search thro...

//Using statement for ExcelTable and TableStyles using OfficeOpenXml.Table; //Defining the tables parameters int firstRow =1; int lastRow = worksheet.Dimension.End.Row; int firstColumn = 1; int lastColumn = worksheet.Dimension.End.Column; ExcelRange rg = worksheet.Cells[firstRow, firstCol...

Switch to the new opened tab. Close the current windows(In this case the new Tab). Switch back to first window. PROTRACTOR: browser.getAllWindowHandles().then(function (handles) { browser.driver.switchTo().window(handles[1]); browser.driver.close(); browser.driver.switchTo().window(...

To use standard location services while the application is in the background you need first turn on Background Modes in the Capabilities tab of the Target settings, and select Location updates. Or, add it directly to the Info.plist. <key>NSLocationAlwaysUsageDescription</key> <st...

[DscResource()] class File { } This example demonstrates how to build the outer section of a PowerShell class, that declares a DSC Resource. You still need to fill in the contents of the class definition.