How to Make Android Apps 21

[@derekbanas]

Sorry Viktor Citaku and Zohaib Hashmi I couldn't answer your question because KZbin will only allow me to answer comments if you have a Google Plus account. Just so everyone knows I answer every comment that I'm allowed to. I didn't want anyone to think I was ignoring them.

[@HugoPossani]

Hey Derek! That's the first time I'm commenting on a video, but I'd like to do it to thank you for all the good quality material you make and post here! Congratulations! Cheers!

[@derekbanas]

Hugo Possani Thank you for taking the time to tell me you liked it :) I appreciate that.

[@mamatcreations48135]

This is alot to digest but you make it so much easier to understand. Im trying to prepare for the Android Associates Badge and you are helping me so much. Thank you

[@derekbanas]

Thank you very much :) Good luck on your badge

[@buckithed]

wow, this is so much code to memorize, and you make it seem so easy! I am always amazed by how well versed you are in every language. I cant imagine the amount of time it would take to learn everything that you have made a tutorial about.

[@derekbanas]

Just use the cheat sheet and don't try to memorize. Over time it is learned naturally through repetition.

[@divyeshjindal7566]

hello Derek, your tutorials are awesome but i request you to please add description of the tutorial in the name of the tutorial so that we can directly see what tutorial i want to see. Also it would be boosting the views as usually we just type our problem and look for video for that but in your videos we can not see what the tutorial is for until i open each and every tutorial. Thank you. hope you make the changes

[@Salmank7]

Hi Derek Banas in few days I learnt lots of things in short period of time. I'm a fan of your tutorials.. I'm a beginner.. Your tutorials helped me alot.. Thanks alot. Please also make video tutorials on navigation drawers activity, setting activity, Google play service activity, tabbed activity, Google maps activity etc which are provided by Android studio during new project creation..

[@derekbanas]

Syed Salman You're very welcome :) I'll be making a bunch of interface tutorials very soon.

[@bonifaceyogendran2294]

Thanks for taking the time to go through this. I started android programming like 2 days ago. No previous experience!

[@derekbanas]

+Boniface Yogendran You're very welcome :) I'm happy that I could help

[@viktorcitaku]

Hi Derek. Thanks for all tutorials. I have a question that isn't about this, but in general. This month I'm gonna start my career as a programmer, I've learned JAVA, C#, (html,css,javascript), MySQL, and some frameworks like Spring. I know you have experience, what is you opinion being a Developer/Programmer? Sorry if the question sounds banal or crazy, and my English, I'm not native speaker. I've recomment this, I think now is also on Google+. And for end i would say all the videos where, are, and would be inspiration for me, ☺

[@TheodosiosTziomakas]

Excellent tutorial! I am going to use ContentProviders in my app. I would like to ask you,if you could put a tutorial in TDD. For example how to test Views like RecyclerView,EditText,ImageView etc with robolectric as well as SQLite and Volley library. Especially the last one is quite hard. TDD is a topic that all Mobile Dev companies ask from candidates. In fact a company gave me a test.I did most of the parts,but not the TDD and failed. :(.

[@charalabostheodorou7454]

amazing work in one of androids hardest to understand topics thank you very much

[@derekbanas]

Thank you very much :) I'm happy it helped

[@sephiroth4488]

Hey Derek, How are you adding key value pairs to the "values" hashmap in ContactProvider.java? The only values.put commands i see in the source code is for a ContentValues object.

[@biss291]

Hey Derek, this isn't really related to the video but, should I first off learn a bit of java then go to your android videos? Or do you teach us java as you go along?

[@derekbanas]

rog iss Learn Java first or watch my Android beginners tutorial. You just need the basics. What I cover in parts 1 - 18 minus parts 8 and 10 will be enough.

[@ibspl]

Hi Derek, why my trials always give "the contactprovider had stopped" after clicking the Add Button and resolver always give "getcontacts keeps stopping" messages? Hope to hear you soon. My regards

[@thomasyee3406]

Hi please make sure your uri are correct and point to your package name.

[@madupuarun]

hi derek...i could not see the hash map getting initialized anywhere..could you please hlep me understand what is the need for this hashmap ? how does the code behave when the set to query builder happens without initialization

[@Soparinho]

Hi Derek, thanks for all these tutorial videos. I'd like to ask what is the purpose of Hashmap values. I know it's for matching column names inside database. How does it pass anything to database without initializing and putting any values to it? Thanks in advance, keep up the good work. Have nice day.

[@pepepriest5973]

You are a hero sr! This was a great help for me, i have a bad time trying to do something similar. Question: Can i make a service monitoring changes for a column table? And can i check gps every time on the same service or do i need another service for this purpose?

[@angelinajolie3921]

Hi Derek ! Is it possible to use only logic and the android api documentation to create something like this or with android we always have to rely on examples in the android api?if so it would be awesome if you did a one-time tutorial using logic and looking up methods and classes in the documentation.Thanks In Advance !

[@derekbanas]

***** I figured all of this stuff out using just the api. I couldn't find a nice example on how to easily use content resolvers so I figured it out through trial and error. When I made my Samsung SDK tutorial I had to figure out the whole API on my own because it was brand new and not documented. I got sample uncommented code and then walked through each line while referring to the API. By the end I was able to easily understand what everything did and why.

[@nilsjensen7899]

Dear derek, Your tutorials are great and very comprehensive, I (and many others) would apreciate if you made a tutorial serie about ios programming with the new swift language

[@derekbanas]

Nils Jensen Thank you :) I'll do my best to make an objective c and swift tutorial this month.

[@AntikLee_HAMBURG]

Derek Banas Hura!

[@nilsjensen7899]

Derek Banas A billion thanks

[@lekhasurya7059]

is it necessary to use content provider before using content resolver

[@pagielsewell3824]

Hey Derek I really enjoy your videos and they are really helpful. I'm currently on lesson 14 of your Java tutorials. I ultimately want to learn to make Android apps. At what point should I switch over from your Java tutorials to your Android app tutorials.

[@derekbanas]

Pagiel Sewell Thank you :) You'll have all the knowledge you'll need after part 18. Maybe take a look at my Java MVC tutorial as well. Feel free to ask questions if you need help. I think my new Android tutorial is now better then my first.

[@pagielsewell3824]

Derek Banas should I go through your android for beginners as well?

[@177048]

hello i know am super late here but i just found the channel and its very nicely presented and clear videos as well , i just want to ask one this which is how to modify the content provider here to make it send suggestions to searchview widget on text change?

[@rahuldass589]

Desperately waiting for tutorial on AngularJs :)

[@derekbanas]

Rahul Dass I plan on making an AngularJS tutorial this month

[@PriyanshuSingh-ed4sv]

Hi Derek, I have been following your app development tutorials regularly and i must thank you for such well organized and easy to understand videos. Can u please tell me how to show the contacts data in a tabular form?

[@derekbanas]

Priyanshu Singh You're very welcome :) I'm glad I could help. I will be making a bunch of interface tutorials after I cover text messaging in the next video.

[@PriyanshuSingh-ed4sv]

Derek Banas Thanks for replying. I will be looking forward to your tutorial.

[@eliftultay5826]

Hello Mr. Banas. I' am trying to get data from the api, connect it with listView adapter in the main activity and I want to use Cursor Adapter but I couldn't understand how to connect list view adapter and cursor adapter. Could you help me? Thanks, Regards.

[@yaqubnaqiyev131]

selam elif kardes android whatsab grubu acalimmi, tum android ogrenenler gelsin gruba. ne dersin?

[@amitkakade3335]

is it work on different phones? i.e, resolver on one phone and provider on another phone

[@derekbanas]

It works on any Android phone

[@amitkakade3335]

k thanks

[@angelinajolie3921]

Hi Derek! Do you remember the custom data structure tutorials you`ve done? i`d like to see you creating a custom hashmap and arraylist. Thanks In Advance !

[@derekbanas]

***** I plan on covering more advanced algorithms and data structures asap

[@ajaydeepak9739]

Hey derek, thanks for all your tutorials i've been following deeply and it has helped me a lot. I tried app21 Contentprovider & ContentResolver video and but im getting an error for the URL as Unknown URL my URL goes likes this "content://com.example.android.contactprovider.ContactProvider/cpcontacts" im actually dont understand about the virtual directory "cpcontacts" ....

[@balance-line]

Hey Derek, good video but I wonder how can we share a csv with random data stream ? thanks

[@Dearth123]

Hi Mr.Banas. I've never wrote a comment under your videos because your examples and your way of explaining things are amazingly crystal clear and I could never say enough "thank you" for doing this (plus I don't want to waste your precious time :) ). However I'm struggling so hard with the "HashMap" you used and googling it isn't helping so much. If you have some time, I'd like you to help me with that. Suppose I would have to map multiple columns and not only "name". How could i do that? Like, I've 4 columns: id, name, surname, age. I did : "private static HashMap< String, List > values;" but the compiler complains me with "queryBuilder.setProjectionMap(values);" because it isn't expecting a List in the HashMap. (I'd like to build an ArrayList with a bunch of Person in it, all having the 4 columns that I previously mentioned and then passing it to the database). Again, thanks for your time and patience. Sorry if my English isn't perfect but I'm Italian and I'm trying my best :). Cheers.

[@Dearth123]

Nevermind, I solved the problem :D. Keep up the good work :)

[@derekbanas]

I'm happy you fixed it :) Sorry I couldn't help quicker

[@Dearth123]

Don't worry sir. You already helped me a lot with all your tutorials (not just Android tuts) :D. Plus, I like to do my "homework".

[@jrcu19]

I love your videos. They r great tutorials. I was wondering if you could do one on how to migrate projects from Eclipse to Android Studio and Unit Test in Android Studios. I started using Android Studios and now I can't seem to get any Unit Tests to work. Thanks!

[@derekbanas]

jrcu19 Thank you :) I haven't had a trouble getting Eclipse to Android Studio. I plan on covering Unit tests very soon.

[@shaco6630]

Derek, do you work for Samsung?

[@derekbanas]

Avi Amir No I don't work for Samsung

[@shaco6630]

Derek Banas What company do you work for, if you dont mind me asking? :)

[@johnsmith-ok6jm]

Avi Amir He does freelance work.

[@derekbanas]

Avi Amir Yes I'm a private consultant

[@shaco6630]

Derek Banas Sounds fun!

[@alirezapeer]

hello and thanks for your great tutorial! i didn't get the use of setNotificationUri method in your code. I even commented this line out but nothing wrong happend! can you explain it?

[@randymarsh787]

How fast do you think I can master java and android programming good enough to be able to produce professional quality software? Let's say I would study around 16 hours daily(theory and practice). Should be achievable in a month or two? I do have some programming experience(mostly Python and C++) and a background in theoretical computer science. BTW, have you ever used things like computability theory or automata theory in real life(I mean outside of the academic world)? How useful is knowing advanced algorithms&data structures? Seems to me like most of the tools we need, are already written... I know those are stupid questions, but I'm really worried that what i'm learning in college is really a waste of time, and I should focus more on tools and skills useful in real life.

[@derekbanas]

Iam Yoursoul Android isn't that complicated. Many things like I demonstrate here are always created in exactly the same way, so there is little point in memorizing things like how to structure a Content Provider. The second part of the video gets into using the content provider which I think is very useful. I'll do my best to cover everything about Android by the end of the month. Then I'll get into games. I personally have found little use for theoretical computer science in the real world. All of my work revolves around using the same tools to make similar apps. The most common skill that I see lacking in new graduates is an understanding of object oriented design. I think that is way more important then knowing how a compiler, operating system, etc. works. Not to say that knowledge is bad, but it isn't very useful monetarily. Yes algorithm knowledge is very useful because it trains your brain to solve similar problems that can't be found in books. I hope my opinions help :)

[@AntikLee_HAMBURG]

Derek Banas I am waiting for you Gaming Tutorial with bigger eyes!!!

[@derekbanas]

Antik Lee I'm working on it right now. I'll make games with Open GL and libgdx :)

[@byran3019]

Hi Derek, great toturial ! I tried step by step, but finally provider worked while resolver did not. There is NullPointerException on boolean android.database.Cursor.moveToFirst(). I checked, the cursor form Cursor cursor = mResolver.query(CONTENT_URL, projection, null, null, null); returned null. I also checked contentURL, and compared the code, but no luck. Any suggestions? Thanks a lot !

[@derekbanas]

Bojie Jiang Thank you :) Check out the code on my site. There is probably a bug some place. Try comparing using diffnow.com

[@angelinajolie3921]

the name of the variable is resolver not mResolver

[@byran3019]

Derek Banas Hi Derek, thanks for reply. I did that, maybe I need do that again, or try to run your code. Thanks again, please keep going, I am your fan:)

[@byran3019]

***** Yeah I know, but I was defined that as ContentResolver mResolver;

[@ScandinavianGut]

What language is this writen in? And how do transfer the app from the computer to the android phone?

[@derekbanas]

FMsekvensen Java You can transfer to your phone when you click to run the code.

[@AntikLee_HAMBURG]

Thank you so much. It helps so much!!!

[@derekbanas]

Antik Lee You're very welcome :)

[@mboutman4]

Hi Derek, i'd like to thank you for your videos, they help me so much. Can you please make videos on how to customize the GUI (button, edittext, textview,listview, etc..) like they did in the linkedapp, means from photoshop to xml. Can you also make a video on scrollable splash screens (image and texts) like in linkedin app.

[@derekbanas]

mboutman4 You're very welcome :) I will be making a bunch of Android interface tutorials very soon.

[@rmbhagat]

Hey Derek, Huge fan of your videos. I just tried your tutorial, however it seems to be giving me the Unknown URI error. I do not the what the issue is. I tried using your code, but that too returns the same error. If you could help me out with this, it'd be a big help

[@rmbhagat]

Found the solution. Adding the full name in the manifest for both name and authorities solved the issue. Great tutorial!!

[@derekbanas]

Thank you for sharing your fix :)

[@geoffreydesousa1254]

Great video ! helped so much

[@derekbanas]

Thank you :)

[@tecnocratay]

great vids!! u rocks! cheers from brazil!

[@derekbanas]

tecnocratay Hello Brazil :) Thank you

[@Mentowah]

How do i create a splash screen. someone please help me.

[@derekbanas]

Shadrack Mentowah Create an Activity that contains your image. Then use a handler as a timer that opens the MainActivity after a few seconds. I'll make one in my next tutorial.

[@Mentowah]

Derek Banas Thanks a lot your tutorial is really helping me. i will love to see it in one of your videos.

[@anandpurushottam4435]

thanks man that was awesome

[@derekbanas]

I'm very happy that it helped :)

[@nejimabdullahabbas4902]

My brother Hello possible explanation of the program Android Studio there is a change in the program in 2015 as possible to explain the program site and thank my brother

[@derekbanas]

Nejim Abdullahabbas I'll cover creating a whole project next time to cover the changes.

[@nejimabdullahabbas4902]

Thank you

[@mareinstalator]

Saying my hats of to you Sir is going to get old really soon. Honestly you should write a book, or at least do android/java courses on lynda.com Thanks for a great channel!

[@derekbanas]

dilo00o Thank you for the compliment :) I have entertained the idea of writing an Android book, but if I do it will be free.

[@derekbanas]

***** A free education for all has always been my goal. Thankfully KZbin / Google has provided the tools I need. I just wish I could make more videos on more topics.

[@derekbanas]

***** I have been blessed beyond my dreams :) I wish everyone else the same.

[@devaadithya3322]

thanks for your very great tutorial, but it's too fast when you explain it

[@derekbanas]

Deva Adithya You're welcome :) Sorry about the speed.

[@markchugnutter]

Deva Adithya, Derek Banas Just pause the video and watch again until you understand :) Derek always pacts a massive amount of crucial relevant information into each of his videos, I always find the pace engaging (my head maybe spinning by the end, but I find the information sticks ... mostly .. but that's just an age thing!!)- Another great tutorial!

[@devaadithya3322]

yes, it's very good

[@calebeghan7991]

YOU are great

[@derekbanas]

Thank you very much :)

[@ericho377]

excellent! if each account can give 100 thumbs-ups, I would give you 200.

[@derekbanas]

Thank you very much :)

[@cesardominguez7792]

thank you :D

[@derekbanas]

You're very welcome :)

[@kevinbenavides92]

I love you

[@derekbanas]

Thank you :) Love you too