Tutorial by Examples: u

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...

Check the right software versions are installed: ansible >=2.0 python >=2.6 shade module for python $ansible --version ansible 2.2.0.0 $python --version Python 2.7.5 Install 'shade' the python component used to pilot openstack. $pip install shade Note : if you use a company...

Our openstack tenant is already set: a virtual lan gives instances private IP a virtual router map public IP to private IP a security key has been generated we have default firewall configuration for ssh and port 80 we are able to launch an instance thanks to the OpenStack web interface ...

Use the 'os_server_facts' command from module 'Cloud' [http://docs.ansible.com/ansible/os_server_module.html]. Variables are defined in ./group_vars/all and the instance name is in server: "MyOwnPersonalInstance". $vi get_compute_info.yml - name: Get and print instance IP hosts: loca...

Instead of printing all the informations, we print only IP address of the first instance whose name is "MyOwnPersonalInstance". It's usually all we need. $vi get_compute_ip.yml - name: Get and print instance IP hosts: localhost gather_facts: False tasks: - name: Get VM infos...

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_...

This guide is explicitly for PostgreSQL 9.1 or higher on linux machines. It uses the postgres extensions-feature that will greatly improve the import of extensions to an existing postgres-installation. If you have to work with an older version of postgres, please refer to the official documentations...

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...

The Laravel framework has a few system requirements. Of course, all of these requirements are satisfied by the Laravel Homestead virtual machine, so it's highly recommended that you use Homestead as your local Laravel development environment. However, if you are not using Homestead, you will need t...

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 ...

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...

Backreferences "Backreferences" are references in a search regex to capture groups in the same search regex. The "search regex" is the regex used in the "Find" field of the Find/Replace dialog box. Here is the most common backreference syntax: Absolute: (group one)...

A regex in Notepad++ may have as many capture groups as desired. (one)(two)(three)...(nine)(more than nine groups!)... Anonymous capture groups use the standard syntax: (group) Named capture groups may use either of following syntax formats: (?<name>group) (?'name'group) Anonymo...

Although it's not officially supported, you can use mouse input in your games: function _update60() x = stat(32) y = stat(33) if (x>0 and x<=128 and y>0 and y<=128) then -- left button if (band(stat(34),1)==1) then ball_x=x ball_y=y...

Plugins are .py files that changes the behaviour of Sublime Text 3. They are written, as you probably guessed, in Python. Because there is plenty of different sort of plugins (text manipulation, linting, formatting, preview, etc), we will not give any example to not over populate this page with a h...

The primary reason to use interfaces to achieve polymorphism and provide developers to implement on their own way in future by implementing interface's methods. Suppose we have an interface and three classes: interface Connector{ doConnect(): boolean; } This is connector interface. Now we...

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 setProgress(p) { // p = number from 0 to 1 const currentWindow = remote.getCurrentWindow(); currentWindow.setProgre...

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...