Samsung organization Qr code. Service codes and key combinations for Samsung Galaxy smartphones. Why do I even need to scan QR codes?

Scanning QR codes on Android smartphones is easier than taking photos. All you need is:

• Smartphone or tablet with camera;
• Internet.

I will explain everything as simply as possible and conduct a practical lesson. Right here, without departing from the article. You can also scan barcodes using the same instructions.

“The interface of my smartphone may differ from yours due to a different theme and version of Android. Differences do not affect the installation and use of the QR code scanner.”

First you need a QR code scanner. I found the simplest one. It has fewer annoying ads and scans what you need. Installing it is very simple. It's even easier to use.

1. First, go to Google Play Market. And write in the line underlined in red: “qr code scanner”, or better yet “smart qr scanner and generator”. We click on the search icon or simply the dropped offer that suits us.

In addition, you can download another great scanning application from us -

How to scan a code from a saved image?

You can also recognize a QR code from a picture on the Internet using special websites. I chose qrrd.ru because it was the only site that loaded for me in less than 10 seconds and had a more or less visually pleasing interface.

How to use it? First, go to the website: qrrd.ru or directly to qrrd.ru/read. We see the following:

Circled in green is the site's menu, which lists everything it can do to help you. In our case, select “Recognize QR code”.

The following page opens with a large button “+Select files”. We click on it. After this, options for “select files” appear at the bottom. Here you can either immediately take a photo and send it. Or click on documents and select a photo that is already on your phone. I took the latter route.

Here I selected the tab with pictures, clicked on the folder where the pictures are stored on my phone and clicked on the image with the QR code, the same one that was already here in the article.

Then it’s up to the site. It automatically uploads a photo or image to itself, and then immediately recognizes and shows the result.

Ready!.

Why do I even need to scan QR codes?

They may contain useful information. The likelihood of this is low, but it could be there. Additionally, QR codes are often used in museums to avoid putting up huge signs with a ton of information, but just use a small QR code and give everyone the opportunity to stand back and read about the exhibit on their phone. Everything is simple and convenient. This is exactly why Denso Wave invented them.

QR code is a great tool for promotions. For example, it may contain an encrypted code that must be shown to the seller in order to receive a discount. There are a huge number of applications. Use it!

I created an application that can scan a QR code. It works well with all Android devices except Samsung Galaxy s4.
The app does not scan the QR code when using a Galaxy s4 device.
Now that this Galaxy s4 has Android version 4.2.2, I have also tested my app on other devices that have the same Android version (4.2.2) as Nexus-4 and it works fine.
Is there any other hardware used to scan QR code in Galaxy s4?
Need help solving this strange problem!

Below is the code I used in my application.

CameraManager.java

/** * This object wraps the Camera service object and expects to be the only one talking to it. The * implementation encapsulates the steps needed to take preview-sized images, which are used for * both preview and decoding. * * @author [email protected] (Daniel Switkin) */ public final class CameraManager ( private static final String TAG = CameraManager.class.getSimpleName(); private static final int MIN_FRAME_WIDTH = 240; private static final int MIN_FRAME_HEIGHT = 240; private static final int MAX_FRAME_WIDTH = 480; private static final int MAX_FRAME_HEIGHT = 360; private static CameraManager cameraManager; static final int SDK_INT; // Later we can use Build.VERSION.SDK_INT static ( int sdkInt; try ( sdkInt = Integer.parseInt(Build.VERSION.SDK); ) catch (NumberFormatException nfe) ( // Just to be safe sdkInt = 10000; ) private final Context context; private Rect framingRect; private boolean preview; ; private boolean reverseImage; private final boolean useOneShotPreviewCallback; /** * Preview frames are delivered here, which we pass on to the registered handler. Make sure to * clear the handler so it will only receive one message. */ private final PreviewCallback previewCallback; /** Autofocus callbacks arrive here, and are dispatched to the Handler which requested them. */ private final AutoFocusCallback autoFocusCallback; /** * Initializes this static object with the Context of the calling Activity. * * @param context The Activity which wants to use the camera. */ public static void init(Context context) ( if (cameraManager == null) ( cameraManager = new CameraManager(context); ) ) /** * Gets the CameraManager singleton instance. * * @return A reference to the CameraManager singleton. */ public static CameraManager get() ( return cameraManager; ) private CameraManager(Context context) ( this.context = context; this.configManager = new CameraConfigurationManager(context); // Camera.setOneShotPreviewCallback() has a race condition in Cupcake, so we use the older // Camera.setPreviewCallback() on 1.5 and earlier. For Donut and later, we need to use // the more efficient one shot callback, as the older one can swamp the system and cause it // to run out of memory. We can"t use SDK_INT because it was introduced in the Donut SDK. useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > 3; // 3 = Cupcake previewCallback = new PreviewCallback(configManager, useOneShotPreviewCallback); autoFocusCallback = new AutoFocusCallback(); ) /** * Opens the camera driver and initializes the hardware parameters. * * @param holder The surface object which the camera will draw preview frames into. * @throws IOException Indicates the camera driver failed to open. */ public void openDriver(SurfaceHolder holder) throws IOException ( if (camera == null) ( camera = Camera.open(); if (camera == null) ( throw new IOException(); ) ) camera.setPreviewDisplay(holder) ; if (!initialized) ( initialized = true; configManager.initFromCameraParameters(camera); ) configManager.setDesiredCameraParameters(camera); SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); reverseImage = prefs.getBoolean(PreferencesActivity.KEY_REVERSE_IMAGE, false); (prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false)) ( FlashlightManager.enableFlashlight(); ) ) /** * Closes the camera driver if still in use. */ public void closeDriver() ( if (camera != null) ( FlashlightManager.disableFlashlight(); camera.release(); camera = null; // Make sure to clear these each time we close the camera, so that any scanning rect // requested by intent is forgotten. framingRect = null; framingRectInPreview = null ) ) /** * Asks the camera hardware to begin drawing preview frames to the screen. */ public void startPreview() ( if (camera != null && !previewing) ( camera.startPreview(); previewing = true; ) ) /** * Tells the camera to stop drawing preview frames. */ public void stopPreview() ( if (camera != null && previewing) ( if (!useOneShotPreviewCallback) ( camera.setPreviewCallback(null); ) camera.stopPreview(); previewCallback.setHandler(null, 0); autoFocusCallback.setHandler (null, 0); previewing = false; ) /** * A single preview frame will be returned to the handler supplied. The data will arrive as byte * in the message.obj field, with width and height encoded as message.arg1 and message.arg2, * respectively. * * @param handler The handler to send the message to. * @param message The what field of the message to be sent. */ public void requestPreviewFrame(Handler handler, int message) ( if (camera != null && previewing) ( previewCallback.setHandler(handler, message); if (useOneShotPreviewCallback) ( camera.setOneShotPreviewCallback(previewCallback); ) else ( camera.setPreviewCallback (previewCallback); ) ) ) /** * Asks the camera hardware to perform an autofocus. * * @param handler The Handler to notify when the autofocus completes. * @param message The message to deliver. */ public void requestAutoFocus(Handler handler, int message) ( if (camera != null && previewing) ( autoFocusCallback.setHandler(handler, message); //Log.d(TAG, "Requesting auto-focus callback"); camera .autoFocus(autoFocusCallback); ) ) /** * Calculates the framing rect which the UI should draw to show the user where to place the * barcode. This target helps with alignment as well as forces the user to hold the device * far enough away to ensure the image will be in focus. * * @return The rectangle to draw on screen in window coordinates. */ public Rect getFramingRect() ( if (framingRect == null) ( if (camera == null) ( return null; ) Point screenResolution = configManager.getScreenResolution(); int width = screenResolution.x * 3 / 4; if ( width< MIN_FRAME_WIDTH) { width = MIN_FRAME_WIDTH; } else if (width >MAX_FRAME_WIDTH) ( width = MAX_FRAME_WIDTH; ) int height = screenResolution.y * 3 / 4; if (height< MIN_FRAME_HEIGHT) { height = MIN_FRAME_HEIGHT; } else if (height > MAX_FRAME_HEIGHT) ( height = MAX_FRAME_HEIGHT; ) int leftOffset = (screenResolution.x - width) / 2; int topOffset = (screenResolution.y - height) / 2; framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height); Log.d(TAG, "Calculated framing rect: " + framingRect); ) return framingRect; ) /** * Like (@link #getFramingRect) but coordinates are in terms of the preview frame, * not UI / screen. */ public Rect getFramingRectInPreview() ( if (framingRectInPreview == null) ( Rect rect = new Rect(getFramingRect()); Point cameraResolution = configManager.getCameraResolution(); Point screenResolution = configManager.getScreenResolution(); /* updated to allow for portrait instead of landscape rect.left = rect.left * cameraResolution.y / screenResolution.x; rect.right = rect.right * cameraResolution.y / screenResolution.x; rect.top = rect.top * cameraResolution.x / screenResolution .y; rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y; */ rect.left = rect.left * cameraResolution.x / rect.right = rect.right * cameraResolution.x / screenResolution .x; rect.top = rect.top * cameraResolution.y; rect.bottom * cameraResolution.y; framingRectInPreview = rect) /** * Allows third; party apps to specify the scanning rectangle dimensions, rather than determine * them automatically based on screen resolution. * * @param width The width in pixels to scan. * @param height The height in pixels to scan. */ public void setManualFramingRect(int width, int height) ( Point screenResolution = configManager.getScreenResolution(); if (width > screenResolution.x) ( width = screenResolution.x; ) if (height > screenResolution.y) ( height = screenResolution .y; ) int leftOffset = (screenResolution.x - width) / 2; int topOffset = (screenResolution.y - height) / 2; framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height Log); d(TAG, "Calculated manual framing rect: " + framingRect); framingRectInPreview = null ) /** * A factory method to build the appropriate LuminanceSource object based on the format * of the preview buffers, as described by Camera.Parameters. * * @param data A preview frame. * @param width The width of the image. * @param height The height of the image. * @return A PlanarYUVLuminanceSource instance. */ public PlanarYUVLuminanceSource buildLuminanceSource(byte data, int width, int height) ( Rect rect = getFramingRectInPreview(); int previewFormat = configManager.getPreviewFormat(); String previewFormatString = configManager.getPreviewFormatString(); switch (previewFormat) ( // This is the standard Android format which all devices are REQUIRED to support. // In theory, it is the only one we should ever care about. case PixelFormat.YCbCr_420_SP: // This format has never been seen in the wild, but is compatible as we only care // about the Y channel, so allow it. case PixelFormat.YCbCr_422_SP: return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top, rect.width(), rect.height(), reverseImage); default: // The Samsung Moment incorrectly uses this variant instead of the "sp" version. // Fortunately, it too has all the Y data up front, so we can read it. if ("yuv420p".equals(previewFormatString)) ( return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top, rect.width(), rect.height(), reverseImage); ) ) throw new IllegalArgumentException ("Unsupported picture format: " + previewFormat + "/" + previewFormatString); ) )

PreviewCallback.java

Final class PreviewCallback implements Camera.PreviewCallback ( private static final String TAG = PreviewCallback.class.getSimpleName(); private final CameraConfigurationManager configManager; private final boolean useOneShotPreviewCallback; private Handler previewHandler; private int previewMessage; PreviewCallback(CameraConfigurationManager configManager, boolean useOneShotPreviewCallback) ( this .configManager = configManager; this.useOneShotPreviewCallback = useOneShotPreviewCallback; ) void setHandler(Handler previewHandler, int previewMessage) ( this.previewHandler = previewHandler; this.previewMessage = previewMessage; ) public void onPreviewFrame(byte data, Camera camera) ( Point cameraResolution = configManager .getCameraResolution(); if (!useOneShotPreviewCallback) ( camera.setPreviewCallback(null); ) if (previewHandler != null) ( Message message = previewHandler.obtainMessage(previewMessage, cameraResolution.x, cameraResolution.y, data); message.sendToTarget (); previewHandler = null; ) else ( Log.d(TAG, "Got preview callback, but no handler for it"); ) ) )

Service tools become useful in cases where the user needs to access certain functions that are not available in normal mode. By and large, they were invented to test the operation of the device, but we can also use them to call up various menus.

Advanced users deal with them all the time. For example, on some Galaxy devices you can adjust the sound volume, find out hidden information about the phone, and much more. Now we will analyze the most useful service codes that are suitable for users of Samsung smartphones and tablets.

How to enter the service code?

Disclaimer: This information is intended for experienced users. You should not try to change anything in the settings if you are not familiar with mobile devices. We are not responsible for any subsequent problems, including loss of data or damage to hardware.

All service codes for Samsung Galaxy smartphones and tablets

I repeat that you should not touch those parameters whose meaning you do not know. You risk losing the functionality of your phone or valuable data.

Useful keyboard shortcuts for Samsung Galaxy

• Enter recovery: with the phone turned off, press the volume up, home and power buttons
• Bootloader/fastboot mode: you also need to turn off the phone, and then hold down the volume down, Home and power buttons
• Take a screenshot: on the desired screen, press the volume up, power and, of course, the Home button.
• Force the phone to switch to off state: simultaneously hold down the volume down and power buttons

We hope these system codes and key combinations will be useful to you, but, as for the 100th time, we want to warn you that you should use them with double caution.

A QR code is a special matrix code developed back in 1994, which became widely known only a few years ago. A wide variety of information can be hidden under a QR code: a link to a website, an image, an electronic business card, etc. Today we will look at what methods exist for recognizing QR codes on the iPhone.

There are two ways to scan a QR code on an iPhone: standard means and using special applications.

Method 1: Camera App

iOS 11 introduces one very interesting feature: the Camera app can now automatically search for and recognize QR codes. You just need to make sure that the corresponding setting is enabled in the smartphone settings.

Method 2: QRScanner

Third-party scanning applications that are distributed in the App Store provide more features than the standard iPhone tools. Moreover, if you are the owner of an outdated model of an Apple smartphone, then you probably do not have the opportunity to upgrade to the eleventh version. This means that such applications are the only opportunity to provide your phone with a scanning function.

Method 3: Kaspersky QR Scanner

Not all links hidden under QR codes are safe. Some of them lead to malicious and phishing resources that can seriously harm your device and your privacy. And to protect yourself from a possible threat, it is recommended to use the Kaspersky QR Scanner application, which is not only a scanner, but also a protective tool against malicious websites.

In addition to social networking applications and games, it doesn’t hurt to have programs that are useful for everyday use on your smartphone. Now QR codes are found almost everywhere: on city streets, product packaging and business cards. Of course, to read them you will need special software. The five best solutions for this task will be discussed below.

QR Droid is distinguished, first of all, by a pleasant and, importantly, understandable interface. The application has long been known among Android device users. After launching, you can immediately scan the required code. If it contained a link to a web page, it will automatically go to the built-in browser. However, this can be disabled in the settings, or you can set your option as the default browser. It is also interesting that directly from the program you can create your own QR code with the necessary information.

2. QR Code Reader

If you don't want to complicate your life and are looking for a simple scanner, then QR Code Reader will be a great solution. There is only a camera (you can also select a finished image from the gallery), a history of scanned QR codes and a flash button, nothing more.

3.BIDI

The BIDI application is in many ways similar to QR Droid. Here we have great opportunities not only for the usual recognition of QR codes, but for creating our own. For example, business cards. Very convenient. There are special separators for phone number, address, email, etc. You can then make the necessary changes to any field.

4. Neo Reader

Neo Reader is perhaps one of the most powerful solutions, since it allows you to read information not only from QR codes, but also from barcodes. Just like in a store: if the application fails to recognize the code, you can manually enter the numbers located below it. There is also the ability to turn the sound on or off, as well as location binding. The only strange thing is that creating your own QR codes directly in the program is not provided. As an alternative, a quick link to the relevant website is provided.

5. QR Reader

The first thing that attracts attention after launch is the moving red line. We’re not sure that it serves any purpose (it’s more likely just a decorative element), but it looks interesting. One more thing: the application, judging by the location of the system buttons, works in horizontal mode, keep this in mind (although in reading mode all content is located vertically). The menu contains scan history and bookmarks. You can create your own QR codes.

What application do you use to read QR codes?

Based on materials from AndroidPit