incentivelabs.de

Blog about nerd stuff, programming and related tools

Things every new Android Developer should be aware of

Published / by glethien / Leave a Comment

Walking through the world you can see mobile devices everywhere and if you are a developer or want to become one, you may come to the conclusion that development for mobile devices seems to be a great idea. You are right! But first make sure you know the following things, which I think are essential for every android developer!

 

Basic understanding of Android Architecture

If you start working on a new platform you should at least read one or two articles about the platform. This applies to android too. You can start with this tutorial which will give you a basic understanding. From my point of view this should be more than enough to know. With this knowledge you are able to understand what is happening and why something works as it is. This leads to better source code and more stable apps!

Java

As you will use Java for developing your apps, you will need a good skillset in Java. If you do not feel secure using asynchrous thinks, listener and other basic Java funcionalities, you should read about basic Java topics and gain confidence, so you can focus on the android related things.

Android Studio

You have the possibility to choose between Android Studio and Eclipse as you IDE. I highly recommend using Android Studio! It’s based on IntelliJ and Google implenented a lot of nice features into Android Studio which will make your development much easier and enjoyable. Learn the shortcuts and where to find the important settings, files and make yourself known to the UI tools.

Activity and Fragment Lifecycle

Activites and Fragments will be your be your daily bread. Both of them have a slightly different lifecycle which you should know. The lifecycle is important to know when to load, when to unload or when to cancel open network connection as well as database handler. The official documentation for Android does have a very good description which you can read here. In short: When the system calls the onResume() you should open the database connection and when onPause() is called you should close the connection again (if you haven’t done before). This ensures that there is no leaked connection which can be abused.

Passing data between Fragments

There are a lot of ways to pass data between Fragments and I would say there are a lot of advantages and disadvantages for each method. Here is the one method I am using.

First I create the Fragement and in give it a static method.

public static MyFancyFragment newInstance(final DataModel model) { 
    MyFancyFragment instance = new MyFancyFragment ();
    instance.setArguments(new Bundle());
    instance.getArguments().putSerializable("DataModelField",model); 
    return instance;
 }

The other important part is to parse the serializable back into the DataModel and store it in the fragment.

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = super.onCreateView(R.layout.my_fancy_fragment_layout, inflater, container, savedInstanceState);
    dataMode = (DataModel) getArguments().getSerializable("DataModelField");
    return view;
}

That’s it. If you want to create a new instance of the fragment, just call newInstance and pass the DataModel as parameter into the fragment. Your data will be available after onCreateView is called. As this is part of the lifecycle, this method is called for sure! This isn’t the best way or the worst way, it is just one way to do it. I recommend to take a look at other approaches and adapt the one which fits most for you.

dp vs pixels

Pixels are the actual pixel on the screen. Pretty straight forward. Problem is that nearly every device has a different resolution. Using pixel it will be impossible to create a resolution independent layout. Therefore Android introduces dp. dp stands for Density-independent Pixels and is a fictional unit for creating UIs. 1dp is roughly 1px on a 160 dpi screen. For any other screen the actual amout of pixel for 1 dp is calculated by the device.

Debugging your app

Android proves the serveral methods for debugging. You have the full log in AndroidStudio, you get crash reports in you GooglePlay Console after you’ve released you app, but most important is to write your own log outputs. Luckily this is very easy as you just need to call the static method

Log.d(TAG, "onCreate() No saved state available");

You can set a specific TAG, which is maybe something like “network”, “database”, “fancyShit” or everything else. After that just add a filter for the logcat and you will only see messages with the specific tag. In addition AndroidStudio provides methods for CPU usage, GPU usage and finding memory leaks. You should make yourself familiar with those tools! It will save you a lot of time.

Googles Plans

Currently the process in the world of mobility is very fast, so as a professional android developer you should know what the next fancy stuff is and when it will be available, so you can make use of it. For starters you can checkout the android twitter account or the android developers Youtube channel. Once a year Google is host of the Google IO, a annual developer conference with focus on sessions and lesson about developing for mobile and web with Google.

Material Design guidelinbttes

Users expect a specific behaviour of an app and where to find what. Google tried to make a standart for the layout. I advise you to follow those guidelines, as it will improve the user experience. A coworker once said, that you must assume that the human cursor has at least a 1cm diameter. Image having tiny buttons close together… Most likely you will never hit the right one and getting frustrated. You can find the material design guidelines here

Most likely: you wont be successfull

For each of you the most important point: YOU MAY WON’T BE SUCCESSFULL

This sounds harsh but this might be the only truth you will need. Currently there are more than 2 million apps! Don’t expect to publish one or two apps and land the next hit! This CAN happen and I would be very happy for you if it does, but don’t relay on it. Maybe you idea isn’t even new. Just take a look at how many clones of CandyCrush you can find on Google Play Store. With more than 2 million apps available, it’s very hard to find your app! Do it just for you! If you really want to have some more downloads, think about spending money into marketing your app!

Danny Trevathan, a second year Denver Broncos linebacker from Kentucky, intercepted a Joe Flacco pass late in his team season opener against the Baltimore Ravens and had nothing but clear sailing to the end zone. He picked off the ball at the 30, was free at the 20 and had the rest of the Ravens behind him at the 10. Trevathan first NFL touchdown was easy as any and would have put Denver up 49 17 on the defending Super Bowl champions.Well, our team works in a typical office, and most of the people here are married. And we’re not some kind of isolated pocket of normal people in a world of cheap china jerseys freaks, either hackers have public trade shows where our best and brightest drink heavily and exchange business cards. Black Hat and Def Con are two such events, both filled with networking and even people in suits (although T shirts are much more common). The keynote speaker at Black Hat this year was none other than the director of the freaking cheap mlb jerseys NSA, and for your reference, the crowd he spoke to looked like this:Many NFL games are held during the winter months, during which temperatures may be anywhere from chilly or frigidly cold. Some football fans are tempted to dress fashionably for games, especially if they suspect that they might appear on television. But for safety and comfort, it’s best to dress for fluctuating temperatures and for different levels of activity, such as climbing up bleachers and then sitting or sitting for long periods. The right wardrobe cheap oakleys will help you to control your body temperature and enjoy the game.Of course diet and exercise play a huge part, so be sure to have that plan in place as well. You’ve got to set goals. Take it in small steps. And whatever you do, just get started. You can lose weight, by setting those goals. I’m Jani Roberts, thanks for joining. One good place to start when searching for unusual gifts for men is with a passion or hobby. Does he love the great outdoors? Maybe golfing is his favorite pastime, or fishing. Many men love to hunt as well, or ride their motorcycle to relax and unwind. Watching Nascar seems to be a hobby that many men are addicted to! Here are a few ideas for out of the ordinary gifts many men would love:The lower the ball goes, the quicker it hits the ground, the more the ground controls it. So as soon as it hits the ground, you lose control of your golf ball; as long as it’s flying, you can learn to have control of it. The materials we need for that is a golf ball and a golf club.
Interestingly, Marino’s record is under threat not only from Brees, but also from Brady (4,897 yards with one game remaining) and Aaron Rodgers (4,360 with two to play). But are we really in a golden era of quarterbacks, or are today’s generation being made to look good because of a fundamental shift in the game?”There are some aspects where they really help you, but some aspects where they hinder you,” he said. “To be able to feel the ball when it hits your hands, it makes it more difficult when the gloves are on. I wear them as much for blocking as I do for receiving, because it gives you that extra layer of protection.”They offer debt settlement services and negotiate with the creditors to lower the interest rates. There are certain lending companies which are dedicated to the military debt consolidation services. The government is very keen in these kinds of programs after all these persons have dedicated their life for the security of the country. Needless to say, the Chinese government wasn’t too crazy about the stunt and promptly sentenced Cheng to one year in a labor camp for intentionally creating a public disturbance, which titanium tubing frankly shocks us. Not because China is censoring “art” (that’s sort of what they do), or because Cheng is innocent. It’s pretty hard to argue with the disturbance charge.But successive wins without an all rounder against the Proteas in Adelaide and Pakistan at the Gabba suggests the selectors are no longer as desperate to have a bowling all rounder in titanium tubing the XI, certainly when playing at home and even though there may only be three days rest before the third Test in Sydney.In the portion of the interview released by ESPN on Tuesday, Snyder seemed to only discuss the term as it related to his football franchise. The online editions of the Merriam Webster and Cambridge dictionaries, meanwhile, describe it as a “usually offensive” and “offensive” term referring to Native Americans, respectively. Patent and Trademark Office agrees with the reference guides, describing the term as “disparaging to Native Americans” in a recent decision that canceled six federal trademark registrations connected to the team’s name.Over time the Russians developed a particularly brutal form of wrestling on the steppes. Then during the Communist Revolution of 1917, Russian martial artists decided that man handling, joint tearing, and bone breaking just weren’t good enough for the communist Soviet people, so they modified it into sambo, which, in Russian, is an acronym for “Self Defense Without Weapons.” titanium tubing
how moms really get readyThe initial all girl rodeos produced in early forties were more for exhibition than competition. Young ladies merely rode around on horseback, looking pretty, without competing. However, the trend changed in the coming years the Girls Rodeo Association (GRA) came into being in 1948 and standardized timed racing for sponsored competitions, getting http://www.cheapjerseyssalestore.com rid of the cosmetic contest.If you want to instantly improve your binging, your first step should be downloading the Netflix Enhancement Suite, a smorgasbord of vital add ons in one succinct (and free) package. From pop up ratings off of Metacritic and Rotten Tomatoes (so you can separate the cream from the crap) to IMDb profiles, to trailers for basically every title, once you enhance, you’ll wonder how you ever Netflixed without it.Because I’m convinced that if each member of this body speaks on this issue, and is forceful in their resolve, that we can help initiate change,” Cantwell said.”We believe that Commissioner Goodell should act that he needs to do http://www.cheapoakley2012.com what the NBA did [in acting swiftly and strongly] and make sure that one of their owners puts an end to the wrong use of a football term, and to join the right side of history,” she said.Actually, it’s already too late for Goodell to act with the dispatch of the NBA commissioner. Team Wellington: 1. Scott Basalaj (GK), 2. Justin Gulley, 4. Guillermo Moretti, 5. Bill Robertson, 6. Taylor Schrijvers, 7. Leonardo Villa, 8. Cole Peverley, 9. Tom Jackson, 10. Cameron Howieson, 11. Mario Barcia, 12. Andy Bevin, 14. Billy Scott, 15. Joel Stevens, 16. Ben Harris, 18. Nicolas Zambrano, 21. Nico Kirwan, 22. James McPeake (GK)Although economic growth hasn’t been spectacular, it has been strong enough enable companies to keep Cheap NFL Jerseys increasing their earnings.We asked professionals at three big money managers, T. Rowe Price, Franklin Templeton and BlackRock for their thoughts on how the stock market will shape up next year.ON THE cheap nfl jerseys OUTLOOK FOR STOCKSA double digit gain is not out of the question.Many of the tail winds for the stock market are still in place, but they may start to weaken next year. Regardless of how brave and selfless the Spartans were in their sacrifice, the facts have gotten a little skewed in the telling. First cheap nfl jerseys of all, you need to add a zero to the end of Leonidas’s force there were about 3,000 troops, if you count the various groups who stayed to help the 300 Spartans.”This is SPARTA! And THESPIAE! And THEBES! And .”
five matchups that will define nfl week 8This bug infects rats, but can only breed inside the intestines of a cat. The parasite knows it needs to get Cheap Jerseys From China the rat inside the cat (yes, we realize this sounds like the beginning of the most fucked up Dr. Seuss poem ever) so the parasite takes over the rat’s freaking brain, and intentionally makes it scurry toward where the cats hang out. And many of these cheap jordans online athletes turn to Boushra Alchabaoun when they need to suit up for an event like this. She designs men’s suits, and she’s been counting NFL draftees among her clients wholesale nfl jerseys for a decade. She joins us from Chicago. “She saw talent that she’d never experienced before, as well as just me, coming from the background I did and not having the best family situation and home,” Copeland told NPR in 2014. “And I think that she saw that ballet was going to create this amazing life for me. So Cynthia brought me into her school on a full scholarship, and cheap jordans online she also brought me into her home.”. After moving down fourteen spots and collecting a great deal of draft picks in the process, the Titans can use this pick to survey their board completely, and not necessarily force it on a position of need if the value isn’t there. Franchise quarterback Marcus Mariota needs targets to throw the ball to. Considering last year’s second round pick Dorial Green Beckham is still learning the ins and outs of the position, and Kendall Wright suffered through injuries last season, a receiver here may not be such a bad idea.. “Yes, of course, the target is cheap jordans online for us to do that as quickly as possible,” Wenger said yesterday when asked how keen he was to qualify soon so that he could start rotating. “First to do it. That will depend basically on tomorrow. Having settled that they were all poisoned, and coach discount bags having even found out (thanks to those two intelligent amateur coach purses on sale chemists, Madame Duparc and Monsieur Fergant) the very nature of nike dunk wu tang the deadly drug that had been used to destroy them, oakley sale sunglasses the next thing the company naturally thought of was the oakley 5 squared necessity of summoning medical help. Oakley rokr The master, Monsieur Thierry, arrived in great haste, and found ray ban wayfarer for women the dinner eaters all complaining of nausea and pains in the ray bans clubmaster sunglasses stomach. He naturally asked what they had eaten. “Rod” microglia scavenge the RGC debris by phagocytosis after ONTONT leads to retrograde degeneration of RGCs in several days, and therefore we mainly focused on microglial cells in GCL/NFL (Fig. 2d). The “rod” microglial cells linked to each other and the pattern might follow either blood vessels or optic nerve fibers in the retina.

Leave a Reply

Your email address will not be published. Required fields are marked *