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First of all, it should be mentioned that modern programmers write applications not for a specific phone, but for a specific mobile operating system. And there are far fewer such operating systems than mobile phone models. Most often, the latest versions of iOS (for smartphones from Apple), Windows Phone (for smartphones of the Lumia series), and Android are used. Android is currently rated as the most popular mobile operating system. If you go to the catalog, for example, the Yandex. Market search engine, which contains smartphones from leading manufacturers (Acer, Fly, LG, Samsung, Sony, HTC, etc.), then with Android OS of all versions (from 1.5 to 5.0) you will find at least 1,500 offers, with Windows Phone - only 50, and with iOS - no more than 20. Android is usually installed on smartphones of different classes - from ‘budget' models to expensive devices. 

Due to the high popularity of Android smartphones, developers have to work actively to provide customers with new functions and applications. Therefore, sometimes programmers need programming homework help online. In other cases, specialists make mistakes during coding. In our article, we will tell you in detail about the common mistakes in Android programming.

Mistakes in Android Programming

As it is known, errors in the software are all possible discrepancies between the characteristics of its demonstrated quality and formulated or those that meet the requirements and expectations of users. Since when developing programs, the programmer must first understand the problem, then come up with its solution and encode it as a program, we can identify three main sources of mistakes

  • Misunderstanding of tasks. Software developers do not always understand what exactly needs to be completed. The analysis of the subject area is usually carried out to prevent misunderstanding of the tasks of the software system

  • The incorrect solution of tasks. Maintaining constant contact with customers and users, providing them with the necessary information about selected solutions and their prototypes can help in choosing the right solution

  • Incorrect porting of decisions into code. The correct representation of decisions in the code can be hindered by both common mistakes and forgetfulness of the programmer or his unwillingness to abandon the usual techniques that do not allow to accurately record the decision

 

Typical Mistakes

As for some types of common mistakes that a developer may make, they can be as follows:

  1. The wrong algorithm (for example, there are various methods, in particular, Gauss's method, Seidel's method, run method, etc. for numerical solution of systems of linear algebraic equations These methods are similar when fulfilling certain (own for each method) conditions that are imposed on the system of equations, and this fact must be taken into account when choosing a method in each case)
  2. Errors of analysis (incorrect programming of the correct algorithm)
  3. Semantic errors (for example, an operator does not actually act quite exactly, or not at all as the programmer predicts). In this case, the program works but works incorrectly. The search for these errors occurs by means of logical analysis of the program and its testing
  4. Errors in performing operations (loss of accuracy, going beyond the data type, etc.)
  5. Data mistakes (symbolic instead of numerical, etc.)
  6. Indexing with going beyond the array, i.e. the use as elements of the array of variables that are outside it
  7. Unforeseen special cases of input-output - for example, when the end-of-file signal is not processed

There are different types of mistakes, depending on what stage of software development the error was detected:

  • Syntactic mistakes are usually allocated by an assembler and prevent further compilation. The absence or inconsistency of open and closed parentheses can serve as an example here. Syntactic mistakes often arise in writing constructions of programming language (numbers, variables, functions, expressions, operators, labels, subroutines); these are errors related to the incorrect content of actions and the use of invalid values

  • Compiler warnings. The application of an uninitialized variable can serve as an example in this case. The compiler may notice that the developer is doing something incorrectly and report about it, but the programmer himself decides to pay attention to the message or not
  • Runtime mistakes. These errors occur during program operation. This usually happens when a program tries to perform an invalid operation. An example of such an invalid operation is division by zero, semantic errors (subtraction of variables instead of addition or segmentation error)

Ways to Eliminate Errors

Two operations are usually used in order to eliminate errors:

  1. Debugging - elimination of syntactic and other elementary errors in programs
  2. Testing - checking the correctness of the program on pre-prepared tests based on the already known exact result

Thus, in this article, we told you about common mistakes in Android programming. We hope this information was useful for you.

 


photographer-1


Has it not been long you became a lover of photography? Do you spend more and more time with the camera? I realize that the beginnings are always difficult. But whoever tries nothing has nothing! The important thing is to try and want to do it! 


This is the reason I have put together these ten errors most often committed by the beginning photographers. You should also read this article to avoid doing it too!


#1: A professional camera is not everything


Do not believe that a professional camera will make you an experienced photographer! There is nothing more wrong than thinking that a super expensive camera will allow you to become a pro and make great photos of good quality. Because a good photographer can make a beautiful photo with any smartphone. We advise you first check all available options in your device or in the device you want to buy, and to think how you can use them. A quick note: even the best screen in the camera will not make the beauty and sense of reality of your photo! So, look at the photos still on the screen of a pc. It must also be well calibrated!


#2: Photography is a freedom of expression. Do not copy others!


It's always good to watch and be inspired by other people's photos. But it is not at all allowed or professional to copy the ideas of others. It is very important to know how to analyze the photos, their colors and their framing, to know how to draw the conclusions and to use it by making his own photos! 
You can also participate in photography training organized by famous photographers, read books and magazines on photography and ask the professionals for advice but above all, especially what it takes is to listen to oneself and not to be afraid to experiment and test, to seek one's way.


#3: Do not use flash




The flash is often well liked and used by amateur photographers as well. But it is rarely or never used by professionals. The flash iterates in cameras making the photos too bright and too flat. So, if you are really interested in photography, leave out the flash and get different light effects instead use a diaphragm or other accessories that help capture the right light. If you do not want to give up the diaphragm reduce its power so that the light captured may seem more natural. 


#4: Avoid excessive blurring of backgrounds


Many people like to use the "bokeh effect." It's a nice effect but does not overdo it! It is good to use it from time to time, but it is especially advisable to focus on the entire framing and on the background, which is also very important in a photo. Never underestimate the backgrounds of the photos because their choice is essential.


#5: Do not take photos without thinking - focus


When you take pictures, you must always have a clear idea of ​​what you want to capture and how. Remember the principle of the third-party rule on the division of the image or division of gold.  It's just the right time to use the principle.


#6: Do not take photos against the sun or in direct sunlight


Good weather and the shining sun can make us believe that it is the perfect time to take pictures. Nothing more deceptive, except you are looking to create some lens flare in your photos! Of course, you have to experiment and try it all but we must not forget that with that time, there are more shady areas so the nose and even the hair will project shade. It is advisable to use a shaded place which gives a much more pleasant and delicate light. 
And if you're talking about shadows - never take pictures so that your shadow appears in the frame with the camera in your hand. It's a mistake as simple as putting your finger in front of the lens. 


#7: Never use AUTO mode!




It is true that the AUTO mode was created especially for beginners of photography. But if you want to progress and develop your abilities as a photographer do not use it! Check all the options available in your device and try to use them. Try also to take pictures in RAW format. The photos in this format are subsequently much easier to process and edit. It is easier to make the necessary changes. 


#8: Photo processing program? That's not all!


And if we talk about photo editing, they are used to highlight and expose the beauty of your photos and not to create photos! Photo processing programs have been created to make photographers' lives easier. But it is better to take beautiful pictures from the start so with a good framing and a good light to do editing just if it's really necessary. Use multiple gradations of lights, contrast and image saturation to become an expert. If you can lay your hands on one of the best mirrorless camera we have in the market today, then you are good to go with shooting great photos.



#9: Do not give up the colors to give more impotence to black and white photos 


Black and white photos are easier to take. But if you want to progress in your photography adventure, it is to be used with moderation. Take the photos in color! And do not be afraid! Especially if the colors are essential for example the photos of Autumn, autumn leaves etc. or the rainbow.


#10: Do not be angry if you are given constructive advice


Nobody is born expert! Neither does anyone become an expert right away as soon as they start in their field. The beginnings can be difficult and we learn all our lives. Accept any criticism that comes from an expert or a professional photographer. They can teach you a lot. Thanks to this kind of criticism you can progress. But do not compare yourself to others, especially not professionals, and especially not when you start. This can only cause useless frustrations, and you do not want to be discouraged from the beginning.


Do not wait any longer! Take your camera and take as many photos as you want! It is not necessary to go to distant and exotic countries to be able to take beautiful pictures or to find beautiful landscapes. You can find inspirations around you in everyday life and in the simplest objects. Just keep your eyes wide open and have your device handy. 


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