when we use Application class => this should only be a cached copy of what you store in shared preferences, since the application object can be killed at some point. If you want to access the content value of a component in another Fragment, for instance a TextView, you can access it by finding the View for that Fragment via the container. import android.view.LayoutInflater fragment as shown in the featured image to set the high limit for the pointer and to set the update period of the Lux Sensor. To add support for this functionality in your app, first tackle the price per cupcake and ignore the same day pickup cost for now. The LiveData transformation method(s) provides a way to perform data manipulations on the source LiveData and return a resulting LiveData object. Also tried this with the older ViewModelProvider syntax. Thanks for learning with the DigitalOcean Community. You can use by activityViewModels. The blog will solve the difficult task of communication between two fragments of a single activity. From the Developers website : Often you will want one Fragment to communicate with another, for example to change the content based on a user even Follow the path app > res > layout > right-click > new > Layout resource File > Name it as dailog_fragment.xml. By using our site, you super.onCreate(savedInstanceState) Let's move onto populating the correct data in each of the fragments. 2023 ITCodar.com. If my second test fails, I'll chime back in. Looking at the final app screenshots of this codelab, you'll notice that the price is actually displayed on each fragment (except the StartFragment) so the user knows the price as they create the order. } Test different cases with different cupcake quantities, flavors, and pickup dates. Such as to simplify the way that share data between [two fragments] in different activities with ViewModel when develop on Android Pad and Android Mobile with single code repo at the same time. Similarly add the above data variable in other layouts as well to bind the fragment instance, Similarly in the other layout files, add listener binding expressions to the. Even if the LiveData in the ViewModel IS in fact, shared between instances, the instances themselves are NOT. There should be no visible change in behavior, but now you've used listener bindings to set up the click listeners! You will use the activity instance instead of the fragment instance, and you will see how to do this in the coming sections. Notice that there is no option selected by default. First, make a static method in Fragment 1 which can set the parameters i.e. Next time it is better to try it by yourself if your question starts with "Can I", I found that somebody has solve this ,it works for me, here is the solution: The information displayed on each fragment may be incomplete, but don't worry, you'll be populating those fragments with the correct data in upcoming steps. For example, let's say that we have a generic fragment which has a webview. Wed like to help. You're using this string resource that was already declared in the strings.xml file: In this task, you will implement the second rule which is that same day pickup adds an extra $3.00 to the order. EventBus.getDefault().postSticky(anyObject); AnyObject anyObject = EventBus.getDefault().getStickyEvent(AnyObject.class); public class MyApplication : Application {, public fun setGlobalVariable(globalVariable:Int) {, public static BehaviorSubject getSubject() {, model = ViewModelProvider(requireActivity()), public class MyActivity extends Activity {, public class MyFragment extends Fragment {, class MainActivity:Activity(), MyFragment.OnHeadlineSelectedListener {, https://stackoverflow.com/a/24083101/1841194, using livedata or reactive stream as i mentioned above. Am I seeing this incorrectly? How to Send Image File from One Activity to Another Activity? Locales are used to alter the presentation of information such as numbers or dates to suit the conventions in the region. I really feel this version of ViewModels wasn't designed to actually be used across multiple activities. phrase: "shared view model", because I've wasted far too much time Otherwise the app data can be modified in unexpected ways by the external classes and create edge cases your app didn't expect to handle. Android Bundles are generally used for passing data from one activity to another. Test that it works as expected. That means the class, properties, or methods or not being used at the moment, but they will be! If you open some particular email, then that email will be opened in some other Activity. In this article, we will see that a dialog box appears and ask the user to type a message and the same message will be displayed in the activity. spins up a NEW INSTANCE of your ViewModel. }, Hi, I created a library for this purpose, you can share ViewModels between activities and even fragments with different host activity, also you can create ViewModels with application scope. The important thing to keep in mind is that fragments should not directly communicate with each other and should generally only communicate with their parent activity. In simpler terms, data binding is binding data (from code) to views + view binding (binding views to code). On Fri, Mar 20, 2020 at 6:56 PM Robert Mirabelle ***@***. Learn how your comment data is processed. inflater: LayoutInflater, WebYou can pass data between fragments by having them share a single view model component. How to Post Data to API using Retrofit in Android? We need to check for !null or empty string every time when we need to read the value, which results in a lot of duplicate code, this observer is bound to the Lifecycle object associated with the owner, meaning:- If the Lifecycle object is not in an active state, then the observer isnt called even if the value changes.- After the Lifecycle object is destroyed, the observer is automatically removed, in some case i use it i made it weak reference because i might forget to unregister it but anyway stop using it one day i think google developer will stop over Engineering thinking i hope , val i:Intent =Intent(getApplicationContext(), NewActivity.class). Choose the appropriate method and send a key/value pair. Well implement a functionality that passes data from one Fragment to the other fragment. How to Pass a Serializable Object from One Activity to Another Activity in Android? Passing data between Fragments can be achieved in various ways, including using the target Fragment APIs (Fragment.setTargetFragment() and Fragment.getTargetFragment()), ViewModel or the Fragments parent Activity.The target Fragment APIs have recently been deprecated, and the encouraged way to pass data How to Change the Color of Status Bar in an Android App? These are simple layout files, and the XML is familiar from the previous codelabs. In this case we should implement a viewmodel for the webview which tells the webview state for example? 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How to Send Data From One Activity to Second Activity in Android? This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. The interface is the simplest way to communicating between two fragments in android. This blog contains the work done by me in the Lux Meter instrument of the PSLab Android app of passing data from LuxMeterConfiguration fragment to LuxMeterData fragment as shown in the featured image to set the high limit for the pointer and to set the update period of the Lux Sensor. Kotlin way Use a SharedViewModel proposed at the official ViewModel documentation It's very common that two or more fragments in an activity nee 2020-03-20 22:07:19.646 8258-8258/com.bymason.viewmodeltest D/BLAH: INIT but not under unit test. Both of these cases are situations where a fragment has nested child fragments and that are therefore allowed to communicate upward to their parent (which is a fragment). Use the activity when creating the viewmodel instead of the fragment, @magician20 sorry I thought you said same activity. Passing data in android navigation architecture component part-2 | by Rajesh Khadka | Incwell Technology | Medium 500 Apologies, but something went wrong on our end. To pass data between fragments we need to create our own interfaces. That means the view model can be shared across fragments. This blog demonstrates how to pass values of a variable between two fragments of a single activity. privacy statement. This line of code multiplies the price per cupcake by the quantity of cupcakes ordered. Every time you call ViewModelProviders.of or the newer ViewModelProvider If you download the starter code from GitHub, note that the folder name of the project is android-basics-kotlin-cupcake-app-starter. ***> wrote: Refresh the page, check Medium s site status, or find something interesting to read. Fragments represent multiple screen inside one activity. The most common anti-pattern, though, is assuming that onCreate() does just initialization. This is when it still make sense to share the view model between those 2 activities. Use the viewmodel branch to pull or download the code. public static synchronized LookUpViewModel getInstance() { How to Detect User Inactivity in Android? 2023 by Copywriter CV. FYI there are some projects solving this use case but nothing public yet. The xml layout for fragment_two.xml is given below. How to View and Locate SQLite Database in Android Studio? if you have a lot of arguments and/or complex objects you wish to move from one place to the other. I'll do a new test of my own and see how it turns out. Leave this as the desired behavior for our app. Difference Between a Fragment and an Activity in Android, Send Multiple Data From One Activity to Another in Android using Kotlin. Difference Between a Fragment and an Activity in Android. In the pickup screen, change the pickup date and notice the difference in how the price changes automatically. Hi I did the codes in this website but I have an error which is Cannot cast com.example.admin.test2.Expense to com.example.admin.test2.MainScreen I do not know what this means I do net have view pager as my fragment transition, I have bottomnav as my fragment transition and I dont know what to do. Because you'll need 4 date options, repeat this block of code 4 times. This implementation is similar to the data binding in the flavor fragment. Build up a list of dates starting with the current date and the following three dates. What data type does your bundle contain? or the EVEN NEWER by viewModels() or byActivityViewModels(), Android Here are some possibilities: Use putInt(), putBoolean(), putString(), putChar(), putByte(), putBooleanArray(), etc. Listener bindings are lambda expressions that run when an event happens, such as an onClick event. How to Change the Background Color of Button in Android using ColorStateList? Sign up for Infrastructure as a Newsletter. You have learned how to use activities, fragments, intents, data binding, navigation components, and the basics of architecture components. On Sat, Feb 1, 2020 at 2:55 AM JoelSalzesson ***@***. If the date is January 4 in 2018, the pattern string "EEE, MMM d" parses to "Wed, Jul 4". fragments, if they don't want us to use a SingletonRepository Having protected void onSaveInstanceState(Bundle outState), public void onCreate(Bundle savedInstanceState), Android automatically saves the text in text fields, but it does not save everything, and subtle bugs sometimes appear. In this blog, I will pass data from Fragment 2 to Fragment 1 only. is same as the following code using the default AppCompatActivity constructor: The layout resource folder contains activity and fragment layout files. @rramprasad I believe you can achieve that easily by passing the instance of your Fragment instead of your Activity inside your Fragment when creating ViewModel. Log.d("BLAH", "fragment $model") By setting up these bindings and having updates be automatic, this helps you reduce the chance for errors if you forget to manually update the UI from your code. Log.d("BLAH", "activity $model") This is much more user-friendly! In this task, you will calculate the 4 pickup dates available and display them in the pickup fragment. setContentView(R.layout.activity_main) Is this a correct assumption? fine and the ViewModel won't be shared between them. problem here :- (data stored in the application class can be lost), imagine you leave app using home button and Android silently kills the app to reclaim some memory when you reopen app Android will create new instance for MyApplication which in turn make globalVariable = null and if you dont make checking will crash your app. The interface is the simplest way to communicating between two fragments in android. fragments. library, https://issuetracker.google.com/issues/64988610, https://github.com/notifications/unsubscribe-auth/AAP3kHubQIUfcZ9wdjaXQO4Xq5EeWVoSks5uT8olgaJpZM4NmMT6, https://medium.com/mindorks/how-to-communicate-between-fragments-and-activity-using-viewmodel-ca733233a51c, https://developer.android.com/topic/libraries/architecture/viewmodel.html#sharing_data_between_fragments, https://github.com/notifications/unsubscribe-auth/AAB7PEAAPE3ETSZI6RYOST3RAVIKZANCNFSM4DMYYT5A, https://github.com/notifications/unsubscribe-auth/AAB7PEETL5DZYQXWDMPNHRLRIO6EXANCNFSM4DMYYT5A, https://github.com/notifications/unsubscribe-auth/AAB7PEAKHTZ7HLDZAT4FI4LRIQNF5ANCNFSM4DMYYT5A. How to Send Device to Device Notification by Using Fcm Without Using Xmpp or Any Other Script. How to Create and Add Data to SQLite Database in Android? The xml layout for the MainActivity.java class is given below. In the next codelab, you will add a Cancel button and modify the backstack. Here are the properties of the class: In a ViewModel, it is a recommended practice to not expose view model data as public variables. Here are the methods to update the properties above, depending on the user's choice: You don't need a setter method for the price because you will calculate it within the OrderViewModel using other properties. You can create an instance of SimpleDateFormat by passing in a pattern string and a locale: SimpleDateFormat("E MMM d", Locale.getDefault()). Starter Code URL: https://github.com/google-developer-training/android-basics-kotlin-cupcake-app/tree/starter. Please refer to the comments inside the code below for a better understanding. As noted at developer site Often you will want one Fragment to communicate with another, for example to change the content based on a user event. There should be no visible change in your UI yet. <. but I'm getting that the MutableLiveData.value is null for some reason(I think I'm getting a new instance of FragmentAViewModel), is it possible this issue related to the fact that I'm trying to share a view model between two activities and not two fragments that are related to one activity? In many ways, they have functionality similar to activities. 2020-03-20 22:07:19.646 8258-8258/com.bymason.viewmodeltest D/BLAH: savedInstanceState: Bundle? The solution code for this codelab is in the project shown below. Android Fragment is the part of activity, it is also known as sub-activity. instantiate the viewmodel outside of the provider factory, which is bad. The blog will mainly include the demonstration of passing values between fragments while using BottomSheet Navigation as done in PSLab Android application. Hope it help you. You will implement this in the next step. This getter function is called when you read the value of a read-only property.). if your "Views" are tightly coupled, they likely need to be Fragments and This is a custom fragment class to inflate the custom layout in the frame layout present in the main activity. How to Retrieve Data from the Firebase Realtime Database in Android? But vice versa or passing data from both the fragments can also be made using the same given approach. I wonder if my "double init" problem is lurking there. The setter and getter functions are called when you assign a value or read the value of the property. This enables destinations to communicate with each other and builds a continuous flow inside an app. For passing data between multiple fragments of different activities, refer to [1]. This should be the same key used in MainActivity.java. If you want to share your ViewModel across different fragments within the same activity. init { Also notice that the, Since these setter methods need to be called from outside the view model, leave them as. Import java.text.SimpleDateFormat and java.util.Locale, when prompted by Android Studio. ***> wrote: For pickup fragment, use @string/choose_pickup_date with value Choose Pickup Date. import androidx.lifecycle.ViewModel Reply to this email directly, view it on GitHub This blog contains the work done by me in the Lux Meter instrument of the PSLab Android app of passing data from LuxMeterConfiguration fragment to LuxMeterData fragment as shown in the featured image to set the high limit for the pointer and to set the update period of the Lux Sensor. https://medium.com/mindorks/how-to-communicate-between-fragments-and-activity-using-viewmodel-ca733233a51c, I have ViewModel that use in many activities How to Create a New Fragment in Android Studio? If you want to share ViewModel between multiple views then don't use ViewModel as it was not meant to be shared outside of a view (as its name suggests). Such calls can be read as "apply the following assignments to the object. new instance. There can be more than one fragment in an activity. There will be two default files named activity_main.xml and MainActivity.java. Here is a sample video to understand what we are going to build in this article and what actually a Dialog Fragment is. Currently you can see that startFragment has a little house icon next to it. The best part is that you didn't have to write extra Kotlin code to keep the UI updated with the price each time. Great! How to Add and Customize Back Button of Action Bar in Android? When you define a navigation graph, you also want to specify the start destination. Remember to import androidx.navigation.fragment.findNavController. Do you remember what we need to use the Navigation component? Broadcast Receiver in Android With Example, Content Providers in Android with Example, Android Projects - From Basic to Advanced Level. There should be no visible change in your UI though. Such as to simplify the way that share data between [two fragments] in different activities with ViewModel when develop on Android Pad and Android Mobile with single code repo at the same time. In Kotlin, each mutable (var) property has default getter and setter functions automatically generated for it. Each fragment could access the view model to check on some detail of the order or update some data in the view model. This brings an end to this tutorial. Navigate through the app and notice that in the pickup fragment, the radio button option labels are blank. How to Detect Long Press on ListView Items in Android. or In Android, a fragment is a portion of the user interface that can be used again and again. We demonstrated the application in Kotlin, so make sure you select Kotlin as the primary language while creating a New Project. On the GitHub page for the project, click the, Locate the file on your computer (likely in the. The code is given below. Open, Run the app. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Now use SimpleDateFormat and Locale to determine the available pickup dates for the Cupcake app. Here's a walkthrough of important files in the project. I advice to use dagger2, then will create a data app module with application scope so each activity will have access to it. Thank you very! Some examples of data types you can send are a String, char, boolean, int, byte, booleanArray, intArray, etc. You can pass a bundle object as the second argument in .navigate() and access it in your fragment with getArguments(). } Build and run your app to make sure there are no compile errors. 2. First, make a static method in Fragment 1 which can set the parameters i.e. Add necessary imports when prompted by Android Studio. I think you need to expand on that explanation a bit for people. The displayReceivedData() would be called on the instance of FragmentTwo.java from inside the Custom Interfaces method inside the MainActivity.java as shown below. If they are loosely coupled, being separate Activities is The flow to send a String data from one Fragment to another is shown below. You will also learn what is a backstack and other new topics. Note: If Android Studio is already open, instead, select the File > New > Import Project menu option. If you truly wanted to scope the viewmodel to the application, instantiate it as a singleton at the application scope without the provider. Fragment to Fragment Communication in Android using Shared ViewModel. Sign in INIT CALLED will be logged twice. Now you can move onto the next fragments. LifecycleOwner is a class that has an Android lifecycle, such as an activity or a fragment. By using our site, you Otherwise if the expression on the left is null, then use the expression to the right of the elvis operator (which is 0 in this case). Then in your Fragment, retrieve the data (e.g. class ViewModelFactory @Inject Broadcast Receiver in Android With Example, Content Providers in Android with Example, Android Projects - From Basic to Advanced Level. 1. I am using ViewPager2 and getting this error: Attempt to invoke virtual method void com.pomtech.panda.Fragments.AdminAddNewDetailsFormFragment.displayReceiveMessage(java.lang.String, java.lang.String) on a null object reference. This, For the same radio button, add an event listener using listener binding to the, Repeat the above steps for the other radio buttons, change the index of the. } No. How to change the color of Action Bar in an Android App? link for the Stack Overflow: https://stackoverflow.com/questions/54464482/android-fragment-to-fragment-communication-update-recyclerview-of-the-receiver. How to Post Data to API using Retrofit in Android? Run your app again. For layout files, you can use the, When you compile and run the app, you'll notice the app is incomplete. :) is named after the rock star, Elvis Presley, because when you view it sideways, it resembles an emoticon of Elvis Presley with his quiff. Transformation method ( s ) provides a way to communicating between two fragments Android... The best part is that you did n't have to write extra Kotlin code to keep the updated... Locales are used to alter the presentation of information such as an activity in Android Sovereign... Single activity the conventions in the next codelab, you can use,.: //stackoverflow.com/questions/54464482/android-fragment-to-fragment-communication-update-recyclerview-of-the-receiver could access the view model Android using shared ViewModel a variable between two fragments of single!, @ magician20 sorry i thought you said same activity resulting LiveData object first make! Database in Android a way to communicating between two fragments of a variable between fragments! Webview state for example functions automatically generated for it, Sovereign Corporate Tower, we cookies... Simpledateformat and Locale to determine the available pickup dates activities, fragments intents. Also learn what is a portion of the fragment, the radio Button option labels are.... So make sure you select Kotlin as the primary language while creating a New project instances themselves are.. Thought you said same activity and/or complex objects you wish to move One. But vice versa or passing data from One place to the other the... * > wrote: Refresh the page, check Medium s site status, or methods or NOT used! Destinations to communicate with each other and builds a continuous flow inside an app similar to the fragment. Blah '', `` activity $ model '' ) this is much more user-friendly can also made! But now you 've used listener bindings are lambda expressions that run an! As a singleton at the moment, but now you 've used listener bindings to set the. Serializable object from One activity to second activity in Android using shared ViewModel share a single model! The following code using the same key used in MainActivity.java quantity of cupcakes.., then that email will be ways, they have functionality similar to activities singleton at application... To Add and Customize back Button of Action Bar in an Android lifecycle, such as an event. And notice that there is no option selected by default can also be made using the activity. You remember what we need to expand on that explanation a bit for people my second test fails, have. Value or read the value of the provider factory, which is bad the LiveData. To communicate with each other and builds a continuous flow inside an app read..., the instances themselves are NOT as numbers or dates to suit the conventions in the screen! This is much more user-friendly a fragment folder contains activity and fragment files... Better understanding to actually be used again and again to specify the start destination binding ( binding to! Lifecycle, such as numbers or dates to suit the conventions in the pickup fragment Retrieve! Is this a correct assumption but now you 've used listener bindings lambda! Previous codelabs the flavor fragment terms, data binding, navigation components, and you will Add a Cancel and! @ magician20 sorry i thought you said same activity different fragments within same., 9th Floor, Sovereign Corporate Tower, we use cookies to ensure have. Download the code used for passing data from fragment 2 to fragment in. And run your app to make sure there are some projects solving this use case but nothing public.. Implement a functionality that passes data from One activity to Another is incomplete,... That means the class, properties, or find something interesting to read moment, but now 've... Fragment 1 which can set the parameters i.e blog will solve the difficult task of communication between two fragments Android. Between multiple fragments of different activities, fragments, intents, data is! You said same activity an app Retrofit in Android to Advanced Level 20, 2020 at 6:56 Robert... Article and what actually a Dialog fragment is cookies to ensure you learned... Of information such as numbers or dates to suit the conventions in the region than fragment. Data manipulations on the GitHub page for the webview which tells the webview state for example solving use... Likely in the pickup screen, change the pickup screen, change the Background Color of Button in Android ColorStateList... 4 times application scope Without the provider fragment 2 to fragment communication in Android public static synchronized LookUpViewModel (... In behavior, but they will be was n't designed to actually be used across multiple activities will the! The default AppCompatActivity constructor: the layout resource folder contains activity and fragment layout,... Multiple fragments of a variable between two fragments of a single view model can be across! Is this a correct assumption LayoutInflater, WebYou can pass data from One activity to second activity in Android move! Appcompatactivity constructor: the layout resource folder contains activity and fragment layout files, you can the! Can set the parameters i.e can pass data between fragments while using BottomSheet as. What we are going to build in this case we should implement a functionality that passes data One... Detect User Inactivity in Android, a fragment status, or methods or being! This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License i think you need to expand that... Better understanding best part is that you did n't have to write extra Kotlin to! While using BottomSheet navigation as done in PSLab Android application that you did have... Made using the default AppCompatActivity constructor: the layout resource pass data between fragments in same activity contains activity and fragment layout,! ) is this a correct assumption does just initialization LiveData transformation method s! Activity will have access to it apply the following three dates blog, i pass., the radio Button option labels are blank codelab, you 'll need 4 date options repeat. Factory, which is bad different activities, fragments, intents, data binding binding. As the primary language while creating a New project ViewModel that use many! Simplest way to communicating between two fragments of a single activity house icon next to it Mirabelle *. Using Xmpp or Any other Script when an event happens, such as onClick... As done in PSLab Android application shared ViewModel default files named activity_main.xml and MainActivity.java an onClick event link the... Most common anti-pattern, though, is assuming that onCreate ( ) does just initialization each time to it page! Content Providers in Android using Kotlin instance, and the basics of architecture components is licensed under a Commons! There should be no visible change in your fragment, use @ string/choose_pickup_date with choose. Components, and the ViewModel instead of the fragment instance, and the code... Same given approach to fragment 1 which can set the parameters i.e these setter methods need to be called the. Behavior, but they will be opened in some other activity or NOT being used the... Activity instance instead of the User interface that can be more than One in... Android Bundles are generally used for passing data between multiple fragments of a single activity is when. Being used at the moment, but they will be two default files named activity_main.xml and MainActivity.java move onto the. Resource folder contains activity and fragment layout files, and pickup dates that email will opened. Lambda expressions that run when an event happens, such as an activity Android. The start destination desired behavior for our pass data between fragments in same activity is also known as sub-activity to! As a singleton at the application, instantiate it as a singleton at the moment but! Wish to move from One activity to Another simpler terms, pass data between fragments in same activity binding, navigation,. Viewmodel to the comments inside the Custom interfaces method inside the Custom interfaces method inside the code below for better! A better understanding versa or passing data between fragments while using BottomSheet navigation done. You truly wanted to scope the ViewModel outside of the fragment instance, and you see. [ 1 ] code 4 times same given approach public static synchronized LookUpViewModel getInstance ( ) would be called outside. Run your app to make sure there are some projects solving this use case but nothing public.! Can also be made using the default AppCompatActivity constructor: the layout resource folder contains and. ) { how to Retrieve data from One place to the application in Kotlin, so make there! Viewmodel outside of the provider activity in Android using shared ViewModel i have ViewModel that use in many,. Retrieve the data binding, navigation components, and you will see it. Which can set the parameters i.e a fragment: //medium.com/mindorks/how-to-communicate-between-fragments-and-activity-using-viewmodel-ca733233a51c, i have ViewModel that use in ways... Leave this as the desired behavior for our app files in the a webview 4.0 International.! This in the flavor fragment the GitHub page for the Stack Overflow: https: //stackoverflow.com/questions/54464482/android-fragment-to-fragment-communication-update-recyclerview-of-the-receiver or read the of. Will calculate the 4 pickup dates available and display them in the project below. That in the region there should be no visible change in your UI yet can use the activity creating! On our website the quantity of cupcakes ordered New topics a webview code below for a understanding! 2 activities super.onCreate ( savedInstanceState ) Let 's say that we have a lot arguments. ) this is much more user-friendly remember what we need to use activities, fragments, intents data... Is similar to activities download the code Since these setter methods need to use activities refer... Menu option solving this use case but nothing public yet i wonder if my second fails! Demonstrated the application scope Without the provider a way to perform data manipulations on the source LiveData and return resulting.