Make a Timer App: Countdown Timer (Ep 2) - Android Kotlin Tutorial

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Learn how to create a beautiful material design timer app for Android.
In this course you will learn how to make a user interface. Later we're going to code a timer which can run in the foreground. Then we are going to upgrade it to be able to run also in the background - and we will control it from notifications! Finally we will create a settings activity where a user will be able to set the length of the timer.
In the second part we're coding the actual timer (CountdownTimer) which can run in the foreground. We're also using shared preferences to persistently store certain data like timer length or seconds remaining.
Get the code from this tutorial: wp.me/p8jOJP-7w
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Опубликовано:

5 окт 2024

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Комментарии : 68

@mkrass 6 лет назад

I really like this series so far, quite comprehensive in my opinion. However, I have some remarks about the code: 1. You should really, really, really use contentInsetStart on the Toolbar title. The trick with the spaces is a hack. 2. PrefUtil can be an object instead of a class. This way, you don't need a companion object to declare your static methods. 3. You should put your app logic (the timer logic and the preferences) out of the Activity and into e.g. a Presenter. The Activity should only deal with the UI. Also, I'd love to see some more Kotlin specific code in future videos, such as extension functions, or delegation. Keep up the great videos!

@ResoCoder 6 лет назад

+Max Krass Thank you for your remarks. I'm not really good with design patterns yet but that will change! One extension function will be in the next part ☺️ EDIT: Just finished recording the "next part". Extensions will be in the part after that. Sorry.

@Dark-jh8kx 6 лет назад

very good tutorial thank you.But maybe better if you doing little slowly :) I have to stop every 15-20 sec to understand.

@robertminardi4268 6 лет назад

I appreciate the tutorial and I'm working through it now, but one thing. The way you're coding is not how people really code. In this tutorial, we're typing code for 20 minutes straight without running the app. I can appreciate that you have the code all worked out and maybe a script, but it's making the tutorial extremely difficult to follow. You're explaining the function of the timer very matter of factly, but you're not demonstrating anything. Wouldn't it make more sense to get one part working, then another and then another. Addressing these issues along the way? You know, like how people actually code in real life?

@yugdamor5556 5 лет назад

right

@chapchaf6802 5 лет назад

agree

@hezekiahskyler9105 3 года назад

I know I am pretty off topic but do anyone know of a good place to watch new movies online ?

@kanedario7639 3 года назад

@Hezekiah Skyler Lately I have been using flixzone. Just search on google for it =)

@garrettfuchs2164 2 года назад

This is the fastest tutorial I've ever seen. It's like he's trying to speed run making the app.

@yasserj3693 2 года назад

Great video I really appreciate your work, but it's a little bit confusing when you use the methods before you initialize it I think it will be more clear if you take it step by step in sequence.

@orangeflip 5 лет назад

Hello i was wondering if what advantages there are to writing in Kotlin vs Java? Does it have anything to do with background/foreground services?

@trul77 4 года назад

in 2020 PreferencesManager is depricated, so to use it add implementation "androidx.preference:preference-ktx:1.1.0" line in build.grandle and use this import line: import androidx.preference.PreferenceManager

@iqmal 4 года назад

omg thankk you. Btw your comment should be pinned abovr ahhah

@Spartacus69 5 лет назад

This is great tutorial style for someone already comfortable with programming. Even though my background is in python, you add nidbits that drive nuances home like nulls and (?) In kotlin.

@satyasingh4638 5 лет назад

YOU ARE GENIUS PROGRAMMER, BUT BEFORE UPLOADING A TUTORIAL LIKE THIS, THINK LIKE YOU ARE TEACHING A PERSON WHO IS LESS GENIUS THAN YOU, THAT WAY YOU WILL TEACH BETTER, YOU ARE GREAT PROGRAMMER BUT A GREAT TEACHER.

@valdompinga Год назад

Hello, thanks for your job is really really great! Is there a way to set the progress bar in reverse? instead of completing the rounded shape, do the reverse?

@rajatpalankar864 6 лет назад

please reply i need to add count down sound like tick tick .....

@pixelfox119 5 лет назад

if anyone is having a gradle error trying to do this tutorial today.. put this in the build.gradle in android{ }... compileOptions { sourceCompatibility JavaVersion.Version_1_8 targetCompatibility JavaVersion.Version_1_8 } this fixed my issue

@cevikmustafa1918 2 года назад

thanks, perfect speed and explanation

@viditkhanna3721 6 лет назад

Countdowntimer doesn't execute the next line until the timer is finished, right?

@mortiganto 6 лет назад

The progress bar resets when leaving the app. I have tried copying your code as well, but i get the same problem. Any ideas?

@ResoCoder 6 лет назад

Hello! I cannot say this with 100% certainty but I think this problem must have gotten fixed in later parts of this series (if it's not working after the 2nd part - but it should be working! :D ). The final version of the app doesn't reset the progress bar. When you come back to the app, its progress is set as you'd expect.

@angelescuba9746 5 лет назад

The Material Progress Bar is giving me problems with the Manifest, anyone has the same problem???

@Hacksaah 5 лет назад

I did. The dependency that he copied and pasted from Github in the last video has been updated since this series was published. Change the dependency in you gradle file from 'me.zhanghai.android.materialprogressbar:library:1.6.1' to 'me.zhanghai.android.materialprogressbar:library:1.4.2'

@FathurrahmanAmin 5 лет назад

@@Hacksaah thank you

@EibeMandel 6 лет назад

Thank you very much, great work!

@nicolasca9592 6 лет назад

Please make it to run in the background!!! Thanks for the series! love it

@ResoCoder 6 лет назад

+Nicolas Ca We're going to make it run in the background in the next part!

@nicolasca9592 6 лет назад

Awesome! Thanks!

@mustaphaojo1758 6 лет назад

I am getting this error Error:Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'. > Could not create service of type AnnotationProcessorDetector using JavaGradleScopeServices.createAnnotationProcessorDetector().

@mohamedkhalifa7578 5 лет назад

please can you converted it to xamarin android . i tried to run countdown timer in background but doesn't work in xamarin >> help please

@AleXoTroN 6 лет назад

Nice Tutorial!! Which editor theme do you use?:o

@TwilightPhantom1 5 лет назад

Thank you! Really great tutorial set!

@cool08player 2 года назад

It was hard following your code. It would have been better if you ran the app each time after writing a piece of code or function, that way we can see exactly what is going on. Thanks

@shubh9207 3 года назад

I'm trying to make the same app but I'm making it inside an activity but I'm not able to set the context and the code is also not running when i set the context to "requireContext()" instead of "this" so can someone help me out.

@jeisonfabiancastillobenite3487 5 лет назад

How do I start the timer without using the button ?, that is, at the moment when the activty opens, help me

@luisdelacal704 6 лет назад

Hey, I watched your whole tutorial and first of all thank you so much for this detailed explanation on how to make a timer app. I followed all of your steps in Java because it is the language that I have known for a couple years now, but your video has made me look forward to learning Kotlin in the future, thank you very much. I´ll leave here my GitHub Java translation of your project in case anyone wants to look at it for reference. I say your name in the description, but if you want me to add more credit to you please tell me. github.com/luiscal4a/Android_Java_Timer_App

@ResoCoder 6 лет назад

Wow, thank you for providing the Java equivalent!