How to Make Android Apps 5 : Multiple Android Activities

[@ahmedzunaid3593]

I just simply love your tutorials. Honestly, there are many paid courses.. full of garbage and doing the same things with same fashion...But your one is a lot different.. keep up the good work...thanks!!

[@derekbanas]

Thank you :) I'm very happy I could help

[@hanznewton889]

This video makes me look stupid in front of my Android Studio., You are awesome man.

[@derekbanas]

Thank you :)

[@maresolaris]

My compliments! This (rather high paced) tutorial actually made me grasp the concept of Intents and multiple screens. Thank you very much and keep up the good works - I really like your tutorials.

[@derekbanas]

+Marcel Berkien Thank you for the nice compliments :) I do my best to make original videos. I'm glad you found it useful.

[@brendanj8344]

3:05 the lightbulb pops up but it says "override resource in other configuration" not extract strings, did I miss something?

[@derekbanas]

Brendan Jackson Make sure your code is the same as mine. I have a link to the code in the description.

[@timblack4549]

Hi Derek, Thanks for the new video! I was wondering why you didn't select "New Activity" instead of "Layout XML File" when creating the "SecondActivity". It creates the java class, layout file and creates the entry in the manifest file in one shot. The only cleanup that might be needed (if you don't want a actionbar menu) is the "Settings" menu item added by default.

[@derekbanas]

In the spur of the moment I thought it may be beneficial to show how the whole Activity came together. These videos aren't scripted so I get strange ideas some times while recording.

[@Shellgaja]

Love your stuff! You break it down into understandable bits and I can actually hear you consistently! and obviously, you know your stuff (at least from what I've seen. ;) )

[@derekbanas]

+Zera Gera Thank you very much :)

[@Shellgaja]

Jurr velcome!

[@StudyGyaan]

Sir i want to ask u a question about my project. Can i convert images into 3d model in android similar software like autodesk123d

[@derekbanas]

Sorry, but I'm not sure what you mean. I doubt a phone has enough power to manipulate 3D models

[@AveLenivius]

Thanks for the video, and thanks for putting the code in description, very helpful!

[@MisterRPMusic]

You sir are the most fantastic human being on the face of the planet

[@derekbanas]

Delta Luke Thank you for the very nice compliment :) I do my best

You are awesome Derek. Your tutorials have a greate quality and your teaching are amazing easily. Thanks for share your knowledge for free in KZbin! Take care and continues to make awesome tutorials like this.

[@derekbanas]

Thank you for the nice message :) I appreciate it!

[@jojoray]

This is such a good, detailed, and high quality tutorial! Love it!

[@derekbanas]

Thank you very much :)

[@MarvelousLXVII]

Very awesome video. Straight to the point. Thanks for making them as well as the cooking videos.

[@derekbanas]

Marvelous Marv Thank you :) I have many more Android and cooking videos coming soon.

[@ethanlee6719]

i've been looking for this video. I've got an internship opportunity, and they gave me 5 days to learn as much of android studio as possible. I'vegot 2 years of courses at my university, it makes sense if you see someone actually doing it. Thanks.

[@derekbanas]

+Ethan Lee I'm glad I could help :) Best of luck with your internship

[@MLSCaptain]

Amazing tutorial! This set of videos is exactly what I was looking for, for the level of coding I'm currently at. Thanks mate!

[@derekbanas]

Art Pisanski Thank you very much :) It has been fun to make.

[@danielb1194]

Hey my app was crashing because we used "getExtras()" instead of "getStringExtra()" on minute 15:01.. i was crashing when i cliked the button and it was a little frustrating. But this is a great video nevertheless and maybe its the version of android studio i'm using at the moment. That seemed to solve the problem i was having. Thanks for the great video derek!

[@paweduszak5251]

is that a good practice, i mean the way of passing data among different activities? Let's say that I can call three other activities from main activity (they return some values to main activity), but how to manage 3 different activities in one event handler for activity result? Is "switch" (in some way) a good idea in this place? For me the perfect solution would be to write different event handlers for different activities, is that possible? Or maybe another solution. Btw thanks for the tutorials, I'm getting started to android environment but I'm not new to programming.

[@bklife5086]

Okay so how would I send a numeric value to one activity (say like a final page to do calculations and such) then have the button actually direct to a different page to input another value?

[@derekbanas]

+The_B&K_Life I cover that in parts 5, 8, 13 and 17 of this tutorial series

[@gurcanyavuz2218]

Are you selling anything about android tutorials or any donation site? I feel bad because you are really making great job and you spends lots of time on them. Thanks again. I loved it :)

[@derekbanas]

Gurcan Yavuz Thank you for offering, but don't feel bad about donating. I don't use the KZbin donate thing because I make enough money. I'm just happy that I'm able to help people :)

[@lewis6991]

Great tutorial! Is there a way to send user defined class objects between activities rather than just strings?

[@derekbanas]

Thank you :) Yes you can pass objects between activities. In the next video I make I'll show how to do it. Sorry I didn't do that here.

[@huupham9028]

Hey Derek your videos are wonderful, I am learning a lot so thank you! However I do have one suggestion/feedback. When you're teaching tutorials with so many folders/files and switching between them a lot, it would be super helpful to have a box in one of the corner showing the path to the current file that you are in! Other than that keep up the great work!

[@derekbanas]

Thank you for the idea :)

[@rodgetech]

Hi Derek, awesome tutorials as usual but what does it mean to inflate a view?

[@derekbanas]

Luis Rodriguez Thank you :) Every widget and layout component is a view. To inflate a view means to place a widget or group of widgets into a view. Kind of like how you put html elements into a div element.

[@goamediagoa4968]

Hi, Is there a way i can create a app to update the content in the app, i want to crate a app were i can keep updating the youtube links to stream videos.

[@ervincasiguran]

can i have multiple activity going back to the mainactivity? if yes, how do you get data that come from different activities? or is it rare for different activities to have data that will be sent to mainactivity?

[@samcostley897]

Tutorial on Objective C in the near future?? Thanks for the great vids!

[@tarekjihad]

Hi Derek,,, walking through your tutorials is an interesting journey. regards

[@derekbanas]

Tareq Jehad I have covered a bunch of different topics over the years. I hope to get back to my roots and cover things like electronics, games, etc. soon

[@rodrigomonteiro9086]

Hello Derik! I've found your videos super helpful and all but to be honest, sometimes you can really confuse a begginer like me. For instance, a 20:20 you use data.getStringExtra() without even explainig why or how!

[@RomanMedvid]

Have a small question: when you get text from an EditText widget, you wrap it with String.valueof(). Isn't it redundant? Thnx

[@derekbanas]

Roman Medvid You have to do that because getText returns an object of type Editable

[@kristerstihomirovs8625]

Hi Derek. Can u help me with my error? When i start the application on my virtual device at the first time it crash but all other times it doesn`t...But on real phone it crash all the time! Error-01-02 10:23:46.078: E/AndroidRuntime(1293): java.lang.RuntimeException: Unable to start activity ComponentInfo{...}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference.

[@derekbanas]

Kristers Tihomirovs It is some sort of coding error. Try comparing your code to the code I provide in the description with diffnow.com

[@kristerstihomirovs8625]

But it's one problem: i coding in eclipse it's a bit diferent code.

[@kristerstihomirovs8625]

I did all what is in your video but converted to eclipse code i can send codes to your e-mail?

[@derekbanas]

Kristers Tihomirovs The code should be the same whether you're using Eclipse or Android Studio. What code changed?

[@andrewsommer2755]

Really good video! What are benefits to using multiple activities as opposed to using one with multiple views which you set invisible or visible based on what screen you would like? I have found multiple activities work best for seamless integration with the back button, but I'm wondering if i missed out on anything else. Thanks!

[@derekbanas]

Thank you :) Sorry, but aside from being able to switch activities with back I know of no other benefits

[@brandonbraye4974]

Hi Derek! I have a question. I'm trying to connect the layouts to the MainActivity, but I'm getting an error. Android Studio says it "cannot resolve symbol 'R'' in setContentView(R.layout.activity_main); Could this be an Android Studio bug, or is there an alternate way to connect the layout to the MainActivity? Thanks!

[@jamesstephens8748]

Hey Derek, So I didn't have any problems following the steps and getting this app to work but I do have a question. When you 'Go Get It' to switch to the second activity and ask for the users name and then return to the main activity it displays the name just fine... but if I go get it again and enter a second user name and return back to the main activity it has both usernames displayed... is there a simple way to rewrite the variable rather than append? Thanks, James

[@derekbanas]

Hey James, Yes don't use append and that will go away, but you'll have to set the text including the original text.

[@filipcecelja]

Hi Derek, I have a little problem. The app works fine until I click the Enter button on the second_layout. After that it returns to activity_main but instead seeing my name typed in the TextView I get a word null. Looked up your code and checked with mine and everything seems to be alright...

[@derekbanas]

+Filip Cecelja Try outputting to the console the changing values of name and try to track it down. Also try comparing all of your code to mine with a site like diffnow.com to help find the error.

[@filipcecelja]

+Derek Banas Thanks bro you are the best. Found the mistake. It was a small caps letter which should have been caps. Expect more questions from me :DD

[@devilrules8]

Hey Derek is there video about how to use camera to take photo and use picture from your phone gallary i am having hard time to figure it out ? Many thanks Sharan

[@2000rahulcool]

Thank you Mr. Derek for these wonderful tutorials, i have one question regarding this tutorial, in the onoptionsselected method, we didnt specify which dialog to open up when the settings is clicked, but how did it open the dialog from the class we created?

[@2000rahulcool]

ooops sorry, this was regardin the previous tutorial

[@jrvvortek4448]

Derek. i am using a recently installed AS (assuming that means up to date), How come in your tutorials it autofills? when you it autofills parameters, mine only adds a closing tag. When you type in android:id="@+id=user_name_edit_text" you have options but those options do not appear in my version. and very rarely does AS offer suggestions when i am typing in keywords

[@derekbanas]

Jr VVortek Make sure power save mode in File is disabled. In preferences Editor -> Code Completion - check Autopopup code completion. File > Invalidate Caches / Restart

[@metalwood7225]

Do you have any videos on storing user data?

[@derekbanas]

I cover 3 ways to save data here kzbin.info/www/bejne/Z3Wyln-vZ5ubhac and SQLite here kzbin.info/www/bejne/jX3SqpKor5Zlia8

[@metalwood7225]

+Derek Banas thx Derek, appreciate it....keep up the good work !

[@IslarfPokemon]

Curious about your decision to make the returning result ID "1" instead of "0"

[@jitenderrawat3658]

Hey Derek, how are you doing? It's fun learning android through your tutorials.Can you please share which tools do you use to make your videos? That zoom in zoom out feature helps to focus. I would like to make videos like yours. Thanks

[@derekbanas]

Thank you :) I'm glad you like them. I show everything I do to make videos in this video kzbin.info/www/bejne/bYTdoqtopLGCb8k

[@mattm7798]

Quick question. When you send the value of the user's name from SecondScreen back to MainActivity, you created an intent(told it to do something or go somewhere) but didn't tell the intent which class to go to(in this case MainActivity.java). How did the intent know where to go? Do intents default to the main java class when non is provided?

[@derekbanas]

setResult() returns to the parent that called for this screen to open. Sorry for not saying that

[@Trihawk7]

Does android studio use a specific programming language like python or does it just use its own language? Great video a well

[@derekbanas]

Thank you :) Yes Android Studio uses Java

[@euklidian-space]

Derek Banas is there a reason why we have android:text="@string/calling_activity_message" at the end of second_layout.xml? cause with that i get calling_activity_message to the right of the enter button instead of the calling activity was

[@euklidian-space]

Gabriel Grover Never mind I figured it out. Went into strings.xml and saw the issue

[@saray1022]

Hi Derek, I have no prior programming experience. I just learned Java for the past few months and I understand the very basic, but for this video I am not following as well as the former videos. You have mentioned in some of these comments that we should just keep going and all of these will come together. Which ones of your java tutorials do you suggest us "newbie" to go over since you mentioned that we only need basic java? Please let me know. Thank you for these amazing videos again!

[@derekbanas]

Sara Y You're very welcome :) You need to know everything covered in parts 1 through 18 minus parts 8 and 10.

[@saray1022]

Thank you for your reply, Derek!

[@joash8098]

Which android studio version you are using???????

[@gaiifafa1306]

Wow, I'm learning so much, thank you so much. So when is it more appropriate to implement the onClickListener instead of doing it in the XML file? I'm more familiar with implementing the onClickListener interface but this method seems much better and easier.

[@derekbanas]

I almost always implement it in the layout file. It is just easier. I'm glad you like the videos. I'll try to upload another tomorrow if possible.

[@Bruce99Lee]

Whats the difference between using fragments and activity screens? When is it best to use either one?

[@derekbanas]

zaft1g337 Fragments are like panels that lie on top of the activity. Anytime it would be beneficial to change the look of the interface without leaving th activity all together is a good time for fragments.

[@jojoray]

BTW, when does part 28 come out? or will you not do one?

[@derekbanas]

I'm making a new cross platform mobile tutorial soon

[@jojoray]

Ok thanks :)

[@SteeveHuang]

Nice tutorial, I learned a lot! I have some problems though. I was wondering what's the difference between startActivity() and startActivityForResult(), and what's the purpose of the final int result variable? Do they have anything to do with the setResult() method in the Second_screen.java?

[@RKMFX]

Very helpful thanks Derek

[@derekbanas]

Your welcome :)

[@sukhjinder619]

Another awesome tutorial!! BTW can you do a tutorial like how to save stuff on the phone? Like similar to a note app or something or just a database tutorial?

[@derekbanas]

Thank you :) Yes I'll cover that. I already have an SQLite tutorial here SQLite3 Tutorial

[@pault4994]

Great tutorial as ever, really covering some useful ground. Each of these I find I made a mistake and I figure it out until it works - which is best way to learn I guess. I got an error in logcat for this app about missing PendingIntent - this turn out that the activity class should extend AppCompatActivity rather than Activity (this super class is depreciated?? as of SDK ver?? ) and a PendingIntent is something to do with calling other apps. Also learn lesson of choosing meaningful/non-confusing labels for ids/variables!! Got the wrong one in MainActivity and trying to access the TextView of the (closed) second screen caused a java null pointer. Anyway I have it working now. Also on an EditText inputType="textCapWords" works where as textPersonName doesn't! I'm quite looking forward to the tutorials on test code and debugging (!)

[@FSHnegativ]

Hi Derek! I have a problem with adding "onGetNameClick" to the Mainactivity.java because it does not work for me to simply use the lightbulb there is no option to add it to the .java: Pleas help me! :o

[@derekbanas]

FSHnegativ Some times that happens. You can go in and type out the whole method.

[@FSHnegativ]

Yeah did that now but it is still annoying that I can't use it.. Still thanks for your videos and for responding me keep up the good work!:)

[@SpamDestroyer]

One thing not mentioned here is the onBackPressed() override method that will allow for the user to return to the first screen using the back button without the application crashing (so long as a result is given. cancelled or otherwise).

[@eamonscullion7847]

Hi Derek, I am currently designing a relatively big android app, and I plan to use the usual android components such as action bars, navigation drawers, fragments etc. I spoke to a friend about my app and he recommended I should focus on Android L and the Material theme as this seems to be the new standard for android apps. Currently there is some support for L on the android developer site, and there is even a version of Android Studio to test L apps on (though still in beta and may be buggy). What would you recommend? And as always, love the tutorials, you're a great help!

[@derekbanas]

Thank you :) I'm a big believer in staying with what works. Android L is not near being ready for prime time yet and may go through numerous changes. Your app needs to backwards compatible as well with previous versions of Android and that won't be possible at the current date, or for some time. Just my opinion.

[@2eamon2]

Derek Banas Couldn't have said it better myself, much appreciated!

[@gabrielbrito6761]

Hey Derek nice tutorial as always :) Just one question man, I have one list view with 30 items and each one of these item goes to a different class. I tried to create a switch() inside the onItemClick method, but I don't know if there's a way to update the Intent to change activities, can you help me? thanks man

[@roopak973]

nice work...5 done 22 to go thanx man!!!

[@derekbanas]

You're very welcome :) Thank you

[@ivopalchev]

Hi derek, could you make a tut or explain how to export app from android studio and how to post them on the android market.

[@derekbanas]

Yes I'll cover that as soon as possible

[@viditkhanna3721]

Awesome tutorial as always but please answer my question what if we want to permanently change the textview of 1st activity after returning from 2nd activity please reply i am new to android development.

[@derekbanas]

Thank you :) As the tutorial continues you'll see ways to save data inside of the apps

[@viditkhanna3721]

Derek Banas in this tutorial, when we close the app and reopen it does the textview of mainactivity will again say the user was derek?

[@michaelvilleneuve1470]

Thank you very much, you and your tutorials are awesome !

[@derekbanas]

Villeneuve Michaël You're very welcome :) Thank you

[@samlak23]

Hey Derek, after updating to lollipop, I can't run apps on my device. I'm using a Nexus 5 and have installed the newest SDK in the SDK manager. Any idea what's wrong?

[@derekbanas]

***** Sorry, but I don't have a device running Lollipop yet. I know L is buggy with the emulator.

[@lemmy7926]

+Samir Lakhani Not sure if you mean any app at all (like in the market) or the ones made by Derek. But try taking a look at my comment in tutorial 2.

[@ralfiii]

And one more thing: If activities like to share some common data (like settings holding a username/password or a block of data like an mp3 file all screens want to work on) - what's the "good practice" to implement that? Passing the data around can't be the solution, right?

[@mehmetfatihcicek2907]

How does this play list differ from your other android tutorial series (the one with 42 videos)? Which one should I stick to (as someone with good experience in Java)?

[@derekbanas]

The first tutorial was focused on teaching while making one app after another. This one will teach each topic in condensed tutorials. This one will cover everything because I'm not forced into trying to make an app in each video. It depends on how you like to learn. They are both free :)

[@mehmetfatihcicek2907]

If I ask more straightforward, which one would you recommend in my case? :-)

[@derekbanas]

Mehmet Fatih Cicek I guess this one since it is more up to date, but you'll have to wait for me to make the videos

[@mehmetfatihcicek2907]

Derek Banas I'll wait with patience, thanks in advance :-) How many videos do you plan to do for this tutorial?

[@derekbanas]

Mehmet Fatih Cicek I have really no idea. I could see it easily being 60 videos plus in length. I plan on covering everything.

[@ralfiii]

I created an app from the "Basic activity" template of Android studio. Then I followed the instructions in this video. Everything works as expected except for one thing: The main form has a "title bar" showing the app-name and also a "settings" button. The 2nd activity screen also shows this look in the preview of android studio, but it does not when I run the app. Any hints for me?

[@sifiso5055]

Hey Banas, thanks for your tutorials.

[@derekbanas]

You're very welcome :)

[@tomdelano7263]

Hello Derek, Can an activity open itself if you declare it in the android manifest and in the intent filter as intent.action.Main and intent.category.Launcher or does every activity have to have an intention in MainActivity.java. I want to have an image button with an intent in MainActivity that opens a separate activity and this image button is already defined in activtity_main. I don't want the layout to change or a for a new one to get created. I just want the activity to be carried out. The error I get is something like, "could not find explicit class .MySecondClass". If not a second activity class file like I have, should I just create a fragment instead? What would be the code for an Image Button that launches a new activity without creating a new layout or altering the current one?

[@derekbanas]

Asim Khan Yes use fragments and update them when the button is clicked.

[@shobankalia1225]

+Derek banas Sir, Thxx for the tutorials..!! But is their is any way that my app starts from the activity in which user entername press OK..!! then return to Main Activity..!! If Possible How..?? & If not Any alternative for that..!!

[@derekbanas]

+Shoban Kalia You're very welcome :) I show how to make a splash screen in this video kzbin.info/www/bejne/bnKnk2iYg7R5fqc

[@jasmeanxo]

Hi, Derek. I'm developing a guessing quiz game but I don't know how to save the changes made before closing the game. For example, the player guessed 5 correct answers, if he/she close the app then open it again, her 5 correct answers will be gone. Right now, my app will only say "correct" or "wrong" based on the value of the edittext/answer. I want save the correct answers so that the player can close then continue the game whenever she/he want. What I want to do is display a trivia for every correct answers and even if the player close the app, when he/she open it, her/his trivias from the correct answers are still there. My app really is just a "classsic" logo quiz. You'll chose categories, chose level then you'll chose what to guess from the thumbnails of pictures. I am just a beginner in Android apps. Can you help me please? Thank you!

[@nexustkfreetoplay5318]

Hey, when making an android app, how do you setup login info / save data base type stuff. So what the players do actually saves in the game. example: I setup an account (or login to google/ect) and make my character, i customize him, get levels, ect, how is all of that information stored? Do I need a server? What all do I need and how do you code for a multiplayer game to work... not just a single player interaction like a calculator.. :p

[@hemanthkumartirupati]

Hi Derek, while going from main activity to second screen you have used some arguments(like (this, secondscreen.class)) in intent whereas you haven't used while going back from second activity to main can you explain me the reason Thank you

[@derekbanas]

hemanth kumar tirupati Hi, I called the second activity with startActivityForResult() from ActivityMain and then called finish() from inside the second screen which closes that Activity. After it closes it sends back the data and displays ActivityMain.

[@sanderclemetsen2112]

Derek, do Android Studio work with jdk 1.8?

[@derekbanas]

+sander clemetsen Yes use 8

[@VictorSanchezSS]

Instead of waiting an result from the second screen, can i send something to the main screen the same way you did to the second one?

[@derekbanas]

+Victor Sanchez Sure you can send a result from the 2nd screen

[@metalwood7225]

might need some time to digest all that....but very nicely explained Pro!

[@derekbanas]

Thank you :) It is a lot to learn

[@bobb.7869]

Hello, Derek. First off, awesome tutorials. I am getting so much more out of how you explain things than I have from others. I am apparently missing something as I have not yet (after many trys) been able to get this app to function. As soon as I click the button, from the main activity, the screen goes white and nothing ever displays for me to enter my name. I have tried the suggestions below such as using getStringExtra() instead of getExtra() but continue to receive the same result. I am using a min/target of 15/23 and have Android Studio 1.5, so I'm not sure how that factors in. If anyone has any suggestions, they would be much appreciated.

[@derekbanas]

+Bob B. Thank you :) Are you getting errors in your LogCat panel in Android Studio? Look specifically for errors in your class names and post them here.

[@Somebodythatiusetoknow1]

Hey, queston on the SecondScreen.java part. At the very beginning I select and right click Activity, Generate, the only things available are Constructor, Getter, Setter, Getter and Setter, equals() and hashCode (), toString(), and Copyright. Any thoughts on where I could Override Methods? Thank you!!

[@Somebodythatiusetoknow1]

Never mind I was shockingly able to figure it out. Overlooked the import. Thanks for the tutorials though! Great job!

[@derekbanas]

Michael Gushulak Great I'm glad you figured it out. I'm very happy you like the videos. You're very welcome :)

[@ddouglascox7362]

Hi Derek your the best, Question: --- Your button shows up under --- Enter Your Name --- mine shows up on the right and most of it is off the screen and the calling_activity_message does not show up at all --- Again I'm wondering is this because I am using a newer version of Android Studio IE 0.8.6 I checked my code line by line it is exactly the same also I'm not sure which Activity template you used I used blank activity again was that right? Also I used minSDKlevel 15 would that make a difference?

[@derekbanas]

D Douglas Cox Thank you :) The version of AS, the SDK and the activity type are correct. Could it be something like your emulator is set to a lower resolution? Sorry, but I'm not sure

[@VincentNicopolsky]

Nice tutorial ! Everything is clearly explain ! :) But at the end of this tutorial you should make some refactoring code to simplify some parts and not to redeclare some variables. But it's nice ! :-D

[@derekbanas]

Thank you :) Yes when I actually start making apps I plan on making sequence diagrams and I'll talk about refactoring.

[@moyvalu6643]

Hi Derek nice job with this videotutorials thank you so much, one more thing what does android:label="Get Name" android:theme="@style/AppTheme" stands for in the manifest?? I will appreciate you help!!

[@derekbanas]

moises alfonso valdes lugo Thank you :) label is the title for the activity and theme defines the theme to use

[@jameskizzy2055]

Hi Derek, thanks alot for giving teenagers like me hope, I want to create a social app Like KIK, Watsapp etc.. and i am having a lot of problem doing so,Can your lessons be of help? Or what do you think I should do?

[@derekbanas]

You're very welcome :) I'm glad you like them. I'll cover how to make a messenger service app. I will start making apps with the next video. I'll make it 100% live in the video so everyone can see exactly what i do.

[@alanb287]

Thank you for this great video! You got me past a sticking point!

[@derekbanas]

Thank you :) I'm glad i could help

[@nathanheath3756]

what if its a menu with different options and you want to make each of the options do something different then what would you do??

[@MrHomeu98]

when i made my imageButton, for some reason, even tho i edited the image using transparent background in photoshop and save it as PNG, there's still white at the background. How can i fix this?

[@derekbanas]

I'll do my best to cover that in the next videos.

[@parthchamp9252]

hello sir. recently i have been working on an android app in which the Main activity has 5 buttons all of them would direct to new activities. Now the problem i m facing is that when i click say 2nd button then the 5th activity opens then on pressing back button 4th activity opens then 3rd and then 2nd activity.i could not figure out the problem.please help

[@mrousavy]

Hey, I'm new to android development, what is an instance? Also, I watched alot of tutorials and I still dont get how to make multiple activities and switch between them with a button without passing data... Thx

[@derekbanas]

+Marc Rousavy An instance is a generic term used for all objects. If we have a class of type dog and define and object named rover, then rover would be an instance of the type Dog. It is jargon. In parts 8, 13 and 17 I show many ways to switch between activities.

[@mrousavy]

Derek Banas Thank you very much!

[@osamansr5281]

2 Qs ,,, (1) is there any other ways to communicate between activities ? in this method we started an activity throw a button click then we closed it after we r finished with it! is there other method to establish communication between open activities ? . . . (2) Y when going back to the MainActivity the constructor of Intent was empty (No prameters like this "new Intent()") ,, Y not like when we started the connection "new Intent (Context , Class)" ??

[@derekbanas]

+Osama Nsr Any even can trigger another activity to open. I cover more as the tutorial continues. I used startActivityForResult() to open the other activity which is used when you plan on getting a result. I have the code here with comments to explain it www.newthinktank.com/2014/06/make-android-apps-5/

[@osamansr5281]

(1) i'll continue with the tutorials :D ,, if i still don't get it i'll come back and ask again x'D . . . (2) i read the code and understood it's okay if i'm going back to MainActivity to let the Intent constructor empty ( but no harm from filling it like the way we went to SecondActivity )

[@rezoanhasib8394]

Hello Derek! Kudos for your amazing work, I am getting helped a lot! For some reason it's printing "The user's name was null" once it comes back from the second screen. Any clue? Thanks!

[@projectpetrol3139]

Hey Derek i'm just a newbie when i say newbie the real newbei :D can you help me making the send and share from the navigation bar work?? Please help me, though i'm kinda shy asking these question

[@shufange5797]

Well, the problem is that whenever you switched to the second screen and pass back and append the name you enter in 2nd screen to main activity, you did the second time, and there will be 2 names result appended on the first screen. I tried set the text back to "The users name was" when clicking on the Button"Go Get It", is there any other solution?

[@derekbanas]

Shufan Ge Sorry, but I didn't get that error

[@adrianalvaradofernandez2666]

thanks Derek amazig tutorial, salutes from Mexico!

[@derekbanas]

+Adrian Alvarado Fernandez Thank you :)

[@leeeroybiscuit]

when i type in setContentView(R.layout.second_layout); i get an error cannot resolve symbol 'R'. would this be down to the api level i am using?

[@derekbanas]

leeeroybiscuit Delete any import Rs you have in your class files and then Build->Clean Project

[@leeeroybiscuit]

yeah thanks for quick response, i did just what you said and fixed it, thanks very much

[@derekbanas]

leeeroybiscuit Great I'm glad I could help :)

[@orientleon]

Derek Banas this is a problem that bothers me for the whole hours, although there are different methods on the web.... you are awesome, man.

[@valentine1925]

Hi Derek, on my second screen the title bar doesnt show up. How to solve that one? TIA

[@valentine1925]

solved it!. I change my import android.app.Activity; to import android.support.v7.app.ActionBarActivity; and changed the extends Activity to ActionBarActivity. tnx btw

[@derekbanas]

Aoi Valdez Great! Thank you for posting your fix :)

[@valentine1925]

I havent check your entire tutorials yet, but do you have a tutorial for hamburger menu something like facebook when you tap on the menu it will slide a menulist on the side?

[@kakakhan_vlogs6734]

helo sir i wana ask that how to make andriod app which disply name or some thing on the screen

[@derekbanas]

I cover splash screens here kzbin.info/www/bejne/bnKnk2iYg7R5fqc

[@kakakhan_vlogs6734]

+Derek Banas oki tnkd

[@angelinajolie3921]

Hi Derek ! Suggestion: The Php in 30 Minutes And The Custom Web Service Tutorials Back-To-Back.Thanks In Advance !

[@peterpetrica5879]

Hey, I have a problem going back from the second activity to the first, when clicking the button on the second screen the app just crashes for some reason. Does anyone know what could be the reason for that?

[@LespritTower]

I'm getting an error on this one where the username comes back as "null". I've checked the code and can't see any discrepancies. What could be wrong?

[@derekbanas]

LespritTower In MainActivity this is the line in which I'm getting that String nameSentBack = data.getStringExtra("UsersName");- See more at: www.newthinktank.com/2014/06/make-android-apps-5/#sthash.0XAeEhqi.dpuf

[@LespritTower]

Derek Banas Thanks Derek. I had 'n' instead of 'N' *embarassed* :\ Working now :)

[@conan_der_barbar]

Nice Tutorial! i have one question though: when you send the callingActivity to the SecondScreen, to get and use it you have to do String previousActivity = activityThatCalled.getExtras().getString("callingActivity"); but when returning the name to the MainActivity you only use String nameSentBack = data.getStringExtra("UsersName"); which looks way simpler could you explain this to me please? :)

[@derekbanas]

Timon That is because we called the second activity with startActivityForResult(), which expects a returned value. onActivityResult() is then called after the second activity ends. I hope that helps :)

[@conan_der_barbar]

thank you! yes it does :)

[@Zoltan_Molnar]

If i install the app on my tablet, the second screen has no actionbar, but in the Android Studio shows it in the "design". How can i fix it?

[@iapetus28]

I got this error message when trying to send from the secondScreen : java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, req... and so on. Random suggestions : setting flags? onactivityresult firing prematurely? Any ideas?

[@derekbanas]

Compare your code to the code I link to in the description. Diffnow.com makes it easy

[@iapetus28]

Derek Banas Thank you for your quick response! Mixed up IDs, so I was trying to find a view from another activity. No compiler error, but it caused a runtime error ;)

[@alhira3024]

Good Tutorial liked it . keep it up :)

[@derekbanas]

+Al Hira Thank you very much :)

[@nilmur]

Would you be able to export your code in a package? Thanks very much for the tutorials. :D

[@tyquanthebeast]

Can you do a video on passing data from one Activity layout where name or code is entered. And go to next to open in "WebView" or a Website like personal site. Hope you get what i'm saying..

[@nicsupir]

Derek why is my display null instead of the name i entered

[@mozus1713]

Check your strings in data.getStringExtra. UsersName != usersName.