Open source software (open-source software) is intended for free access to source code For everyone. There are different licenses with different terms of use from GPL (GNU General Public License) and to a more loyal Apache License... The first allows free distribution, provided that the same license is used for subsequent products. The second does not require the mandatory distribution of the finished product and open source code. Androiduses both. Inside, the sequel talked about open source and open source software.
The kernel that is used in the OS is affected by GPL... This means that all changes source code should be available to the public after the official release of the software. In practice, it should look like this: manufacturers such as Htc, Samsung, Motorola, releasing a new device, are obliged to make open access to source code since the release of this device. For the most part, hardware manufacturers delay a little with this.
Source for OS Android usually falls under the influence Apache License... Everyone can download source and change it without having to make the code available to everyone. For this reason Android cannot change or improve HTC Sense or MotoBlur. Although many users do not like this situation, it cannot be changed for commercial reasons. If manufacturers made all their secrets available, then there would be no financial reason to create various innovations to stay ahead of competitors in the competition. Thus, the use of a more loyal license is fully justified. The release of new devices regularly confirms this.
Most likely on your phone already installed by default QR code scanner, you can easily scan the first QR code with it. This is very easy to do. Just follow our instructions.
1. Open the QR code reader on your phone.
2. Hold the device over the QR code so that it is clearly visible on the screen of your smartphone.
If you hold your smartphone correctly over the QR code, then the following will happen:
- The phone scans the code automatically.
- In some code scanning apps, you have to click on an image, not a button as you would to create a photo on your smartphone.
3. Press the indicated button, if required.
Super! Your smartphone reads the code and follows the specified link, which does not always happen instantly. On most devices, this may take a few seconds.
You will start to see QR codes all over the place. They are used for teaching, informing, explaining and many other things. Find them and scan them! QR codes will save you a lot of time and effort.
How to scan QR codes on Android
Now we are going to show you how to use the QR code scanning app on Android.
Briefly:
1. Open Play Store .
2. Search qR code reader .
3. Select QR Code Reader (via Scan).
4. Click " Install ".
5. Open the program qR code reading.
7. Point the camera at the QR code.
8. Click " OK".
Step 1... Open the Play Store on Android. It's an icon in the app or on the home screen.
Step 2. Enter the QR code reader in the search engine.A list of QR code reader apps will appear.
- This article explains how to use QR Code Reader, but you can choose which app you like. Just be sure to read about the app before downloading.
- The steps should be the same for all QR code reader apps.
Step 3.Click QR Code Reader developed by Scan. The developer's name is listed below each app. You may have to scroll down the page to find the app made by Scan.
Step 4.Click Install. A popup will appear asking for permission to access information on your Android.
Step 5.Click “Accept”. QR Code Reader will now be installed on your Android device.
- When the application is downloaded, the Install button will change to Open and you will have a new icon in the application.
Step 6.Open QR Code Reader. It's an icon that looks like a QR code in the app. An application will open that looks like a standard camera screen.
Step 7.Align the QR code in the camera frame. A bit similar to how you take photos, except that you don't have to press any buttons. When the barcode scanner reads the code, a popup will appear with the URL in the code.
Step 8.Click OK to open the website. This launches your default web browser and navigates to the URL in the QR code.
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Browser developers have taken care of the convenience of those who create sites that open in these same browsers, namely, about webmasters. They added developer tools to the standard functions, with which you can easily open and view the source code of the site page in the browser: HTML, CSS, JavaScript (JS), get various useful data about the structure of the site, conduct its technical analysis. In general, to see a lot of useful things.
Of course, these tools are used not only by site creators for work, but also by ordinary users who can see various useful data with the source code.
In this article, you will learn how to view the source code of a site page in a browser (how to open HTML, CSS, JavaScript site code).
How to open the source code of a page in a browser
There are two ways to open the source code of a web page in a browser:
- Using hot keys;
- Open from the context menu.
Ctrl + U - a combination of hot keys to view the source code of the entire page of the site in a separate new window. Standard for all browsers: Google chrome, Opera, Mozilla Firefox, Yandex browser, IE.
You can also enter the developer tools as follows:
In order to quickly find the required code, word or text on the page, you can use the search hotkey combination standard for all browsers: Ctrl + G.
Video instruction:
View item code | explore item | inspect an item
If you suddenly need to view not the entire source code, but display only a separate part of it, some section on the page, then the previous tool will not work. To do this, there is another function in the developer tools, which will be discussed below.
How to view the code of an element on a page:
In addition, you can use keyboard shortcuts to quickly access element inspections.
Hot keys (buttons):
Google Chrome: Ctrl + Shift + I and Ctrl + Shift + C
Opera: Ctrl + Shift + I and Ctrl + Shift + C
Mozilla Firefox: Ctrl + Shift + I and Ctrl + Shift + C
Yandex browser: Ctrl + Shift + I and Ctrl + Shift + C
After the actions taken, the source code of the web page will open in the same browser window:
All HTML code will be in the left large column. And the CSS styles are on the right.
The advantage of this method, of course, is that the user has the opportunity to change the source code, edit styles. That is, you can edit the styles on the site and see how it will look with certain styles, without having to immediately make changes to the files that are on the hosting servers. To change or add the program code, you need to double-click on the desired fragment or area. Of course, the browser code fix will not be applied to the hosting servers. Therefore, in the future, in any case, you will have to copy this code and write it into the files.
This video tutorial details and shows you how to work with the developer tools:
Just like that, online, right in the browser, you can view the source code of the site page, get basic data about HTML and CSS code, change and copy them, without having to download the files of this site to your computer.
By the way, inexperienced Internet users who have changed the page code and expect it to be saved will be disappointed. After all, after refreshing the page, all changes on it will disappear. This is not enough to hack the site 🙂
How to view the source code on an Android phone
I would also like to note that developer tools are available not only in the desktop version of browsers, that is, on computers and laptops. On phones and tablets (Android, IOS), you can also view the source code.
To do this, add the view-source prefix to the URL of the inspected page:
For example:
view-source: https: // site / turbo-rezhim-opera /
Every day there are more and more Android apps. Millions of interesting games and useful programs can be found in Play Market... All of them have a user-friendly interface and cope with the task at hand. It is difficult to imagine the modern world of information technology without them. This article is aimed at people who not only value functionality and appearance applications, and are also interested in their internal structure.
If you have ever wondered what is “under the hood” of your favorite application, and you know a little about programming, this article is for you. We'll show you how to view the source code of an Android application right on your gadget. Go!
General information
Most programs for the Android OS, like most of the operating systemwritten in a programming language. This means that looking at the source code of Android programs, we will most likely see Java code with using Android SDK (which includes Android platform tools). Again, to understand the source code of applications, you need to have a basic knowledge of Java and how Android works.
How do I find the source code of Android apps?
To get started, download the application, the source code of which interests you. Then go to the Play Market and download a utility called Show Java. It is she who will do the decompilation. Have you installed it? Great, now let's move on to the fun part - extracting the source code of the Android program. Launch Show Java.
Select the required application from the installed ones, or find it on the SD card. Now you need to select a decompiler. I usually choose CRF. If you have problems, try JaDX.
Upon completion of the process, you will receive a list of source packages Android Apps... Of course, this is not a 100% copy of the code that the developers of this application wrote. But the main logic remains, it is not difficult to make out. What to do with the sources? Anything. Look, disassemble, maybe you will be interested in some "features" or implementation features of the program's functionality.
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