It executes a block of code within the context of an object. You can create an instance of SimpleDateFormat by passing in a pattern string and a locale: SimpleDateFormat("E MMM d", Locale.getDefault()). whoever conforms to that interface, can be informed by the Fragment of events. To pass data between fragments we need to create our own interfaces. How to Create a New Fragment in Android Studio? Yes you can @rramprasad If the user wants same day pickup, the extra $3 cost would lead to a total order price of $15. Now you should see the formatted price string for subtotal and total. import android.os.Bundle Create a new instance of the fragment to which you would like to send the bundle. Now use SimpleDateFormat and Locale to determine the available pickup dates for the Cupcake app. https://github.com/FarshadTahmasbi/Vita. Reply to this email directly, view it on GitHub Java is a registered trademark of Oracle and/or its affiliates. Run your app, navigate through the app. Remember to import androidx.navigation.fragment.findNavController. Step 3: Add EditText, Button, and Frame in the layout file (activity_main.xml). Create an action from the, An arrow between the two fragments indicates a successful connection, meaning you will be able to navigate from the, The three new actions you created should be reflected in the. Fragment_1.java Bundle i = new Bund How to Retrieve Data from the Firebase Realtime Database in Android? The output of the above application in action is given below. How to Add and Customize Back Button of Action Bar in Android? A Locale object represents a specific geographical, political, or cultural region. If you truly wanted to scope the viewmodel to the application, instantiate it as a singleton at the application scope without the provider. As you navigate through the app, notice the title in the app bar. But they can be replaced by the necessary variables as per the app. class MyFragment : Fragment() { What type of data do you want to persist between activities? class ViewModelFactory @Inject to your ViewModel, as documentation worldwide implies. Below is the code for the activity_main.xml file. Android Bundles are generally used for passing data from one activity to another. The lifecycle owners are the flavor, pickup and the summary fragments. I wonder if my "double init" problem is lurking there. This opens the GitHub page for the project in a browser. 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Also notice that the, Since these setter methods need to be called from outside the view model, leave them as. You will need a String to hold the key and a variable of the correct data type to store the value. and using viewModelFactory by extends ViewModelProvider.NewInstanceFactory, ` private MutableLiveData mutableLiveData; One activity can have many fragments, means two or more fragment can share one ViewModel. You can share between fragments in the same activity by instantiating them Intents are only usable for sending data on an Activity level. This is much more user-friendly! It allows for formatting (date text) and parsing (text date) of dates. Leave this as the desired behavior for our app. Thanks again! } How to Create/Start a New Project in Android Studio, http://schemas.android.com/apk/res/android, https://media.geeksforgeeks.org/wp-content/uploads/20210803100616/1211.mp4. You will use the activity instance instead of the fragment instance, and you will see how to do this in the coming sections. Make sure the price is correctly updated on each screen. Choose the appropriate method and send a key/value pair. As the name would suggest, fragments are not independent entities, but are tied to a single activity. } the value of the variables as soon as the fragment is inflated as follow. A few exceptions to this are dialog fragments presented from within another fragment or nested child fragments. This blog demonstrates how to pass values of a variable between two fragments of a single activity. Remove the initial values from the declaration of the properties in the class. ", @{viewModel.flavor.equals(@string/vanilla)}. } acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structure & Algorithm-Self Paced(C++/JAVA), Android App Development with Kotlin(Live), Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Shared Preferences in Android with Example, MVVM (Model View ViewModel) Architecture Pattern in Android. @MunishThakur My only possible issue with that approach is -> The ViewModel is expected to be cleared when onCleared() is called. it's already 1.1.0. https://github.com/google-developer-training/android-basics-kotlin-cupcake-app/tree/starter, Comfortable with reading and understanding Android layouts in XML, Able to create a navigation graph with fragment destinations in an app, Have previously used fragments within an activity, How to implement recommended app architecture practices within a more advanced use case. That means the view model can be shared across fragments. Passing Data between Fragments on Android Using ViewModel | by Danish Amjad | Heartbeat Write Sign up Sign In 500 Apologies, but something went wrong on our end. Notice that there is no option selected by default. Add necessary imports when prompted by Android Studio. Fragment to Fragment Communication in Android using Shared ViewModel. 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. How to Pass Data from Dialog Fragment to Activity in Android? 1. 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). 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. If the date is January 4 in 2018, the pattern string "EEE, MMM d" parses to "Wed, Jul 4". Essentially, you are comparing the viewModel.flavor property with the corresponding string resource using the equals function, to determine if the checked state should be true or false. Every time you call ViewModelProviders.of or the newer ViewModelProvider fine and the ViewModel won't be shared between them. How to Install and Set up Android Studio on Windows? How to Implement Tabs, ViewPager and Fragment in Android using Kotlin? Here, the highValue, updatePeriodValue and selectedSensor are the variables being used in the Lux Meter fragment in PSLab Android app. In simple terms, it transforms the value of LiveData into another value. What data type does your bundle contain? 2020-03-20 22:07:19.646 8258-8258/com.bymason.viewmodeltest D/BLAH: There can be more than one fragment in an activity. Let's move onto populating the correct data in each of the fragments. Above demonstration can be extended in passing values between multiple fragments of the same Activity by creating different methods in different fragments. or Now you are using the. The latest solution for passing data between fragments can be implemented by using Android architectural components such as ViewModel and LiveData. The Android framework provides a class called SimpleDateFormat, which is a class for formatting and parsing dates in a locale-sensitive manner. The most common anti-pattern, though, is assuming that onCreate() does just initialization. This is a custom fragment class to inflate the custom layout in the frame layout present in the main activity. Behold, all this confusion because the very concept of a shared ViewModel Is this a correct assumption? In your app, the LiveData object or the observable data is the price property in the view model. How to Add and Customize Back Button of Action Bar in Android? When and where are bundles used? Thanks for learning with the DigitalOcean Community. But they can be replaced by the necessary variables as per the app. 2023 ITCodar.com. From looking at the app features, you can reason that it would be useful to store this order information in a single ViewModel, which can be shared across the fragments in this activity. How to Detect Long Press on ListView Items in Android. Connect with the Android Developers community on LinkedIn. Android fragment lifecycle is affected by activity lifecycle because fragments are included in activity. bundle.putString("key","abc"); // Put anything what you want How to Install and Set up Android Studio on Windows? its perfectly fine to init a singleton inside oncreate in MyApplication that sets up the retrofit service, which is what Ill continue to do until someone offers a better way. How to Change the Color of Status Bar in an Android App? Starter Code URL: https://github.com/google-developer-training/android-basics-kotlin-cupcake-app/tree/starter. How to Create a New Fragment in Android Studio? A LiveData observer observes the changes to the app's data only if the lifecycle owner is in active states (STARTED or RESUMED). In the onCreateView method of the Fragment where youwant to access the value, add the two lines at the bottom of my example code. Even if the LiveData in the ViewModel IS in fact, shared between There is an option to disable this "re-create activity on rotation" behavior, but it will not prevent restart-related bugs, it will just make them more difficult to detect. with the lifecycle owners in the app. For pickup fragment, use @string/choose_pickup_date with value Choose Pickup Date. The custom fragment class is initialized and the input string is passed to get desired results. There can be more than one fragment in an activity. You are receiving this because you were mentioned. 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. There will be two default files named activity_main.xml and MainActivity.java. Difference Between a Fragment and an Activity in Android, Send Multiple Data From One Activity to Another in Android using Kotlin. 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. Select this folder when you open the project in Android Studio. For example, let's say that we have a generic fragment which has a webview. You have learned how to use activities, fragments, intents, data binding, navigation components, and the basics of architecture components. 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. This will separate out the view model code from the rest of your UI code (fragments and activities). By using our site, you Blog on how to pass data between fragments of different/same activities: https://www.journaldev.com/14207/android-passing-data-between-fragments, Prevent Android Activity from Operating while using Bottom Sheet in PSLab App, Creating Activity for Visualizing Recorded Sensor Data from List Items, Setting up environment to build PSLab Android app using Fdroid Build. The starter code will contain code that is familiar to you from previous codelabs. A bundle is a way to store key/value pairs. I was searching for a solution for more than a week. View in this context This should be the same key used in MainActivity.java. Similarly other app data such as flavor and pickup date are also used in summary screen. } Do you remember what we need to use the Navigation component? if your "Views" are tightly coupled, they likely need to be Fragments and I'm trying to share data between two fragments in different activities with ViewModel is this possible ? Refresh the page, check Medium s site status, or find something interesting to read. 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. You will also update the shared view model based on the selections the user makes in the UI. Android Fragments. Here is a sample video to understand what we are going to build in this article and what actually a Dialog Fragment is. How to Push Notification in Android using Firebase Cloud Messaging? 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. A delegate property is defined using the by clause and a delegate class instance: Next you will use data binding to bind the view model data to the UI. Some examples of data types you can send are a String, char, boolean, int, byte, booleanArray, intArray, etc. 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. We can see that when the text is typed in the EditText and the button is clicked, the same text is displayed in our custom fragment. Bundles are generally used for passing data between various Android activities and/or fragments. You can technically do that but I can't fathom in what situation this is better than saving the state in the data layer. You can't currently do it, @yigit do we have solution for this yet? You can pass a bundle object as the second argument in .navigate() and access it in your fragment with getArguments(). This is because the price is changed in the view model but it is not notified to the binding layout. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. In many applications, you may have seen that whenever we have to make choices some kind of elevated dialog box appears and ask the user for some input or choice. how can I do that, please tell me. How to Push Notification in Android using Firebase Cloud Messaging? Simply create a single holder object containing getter/setters for the arguments and then pass it along. Hence, for an order of 6 cupcakes, the price would be 6 cupcakes x $2 each = $12. This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. But they can be replaced by the necessary variables as per the app. @yigit Has this issue been addressed in the stable release yet?? Designed by Colorlib. The function manipulates the source LiveData and returns an updated value which is also observable. Then in your Fragment, retrieve the data (e.g. The xml layout for the MainActivity.java class is given below. Thank you very much! We shall pass a string to the fragment. The blog will mainly include the demonstration of passing values between fragments while using BottomSheet Navigation as done in PSLab Android application. Import java.text.SimpleDateFormat and java.util.Locale, when prompted by Android Studio. You're not getting a reference to your ViewModel, as documentation worldwide implies. I tried various solutions like: (this - inside of the fragment) Use the appropriate method from the Bundle class to send your bundle. The LiveData transformation method(s) provides a way to perform data manipulations on the source LiveData and return a resulting LiveData object. Sign up for Infrastructure as a Newsletter. private static LookUpViewModel lookUpViewModel; ******) At the Beginning of the Class. Here are some possibilities: Use putInt(), putBoolean(), putString(), putChar(), putByte(), putBooleanArray(), etc. It is wrong, because it also must restore the state. "Protected Apps" Setting on Huawei Phones, and How to Handle It, About Us | Contact Us | Privacy Policy | Free Tutorials. Also tried this with the older ViewModelProvider syntax. Passing data between screens is a common use case in an Android app. :) is named after the rock star, Elvis Presley, because when you view it sideways, it resembles an emoticon of Elvis Presley with his quiff. inflater: LayoutInflater, Recall that the Data Binding Library is a part of Android Jetpack. The MainActivity has similar code to the default generated code, which sets the activity's content view as activity_main.xml. Passing arguments between fragments. Open, Run the app. So I just want @FarshadTahmasbi super.onViewCreated(view, savedInstanceState) In the next codelab, you will add a Cancel button and modify the backstack. There are different ways to display a formatted date, and here are some helpful utilities provided by Android to do this. :) . Both your fragment and its host activity can retrieve a shared instance of a ViewModel with activity scope by passing the activity into the ViewModelProvider or the EVEN NEWER by viewModels() or byActivityViewModels(), Android How to change the color of Action Bar in an Android App? In the method public View onCreateView() create a variable to hold the value from the bundle, i.e. This site uses Akismet to reduce spam. How to Pass a Serializable Object from One Activity to Another Activity in Android? So in this article, we will show you how you can pass data from an Activity to the Fragment. And the pick up charges are correctly reflected in the summary screen. So for people looking at this, you shouldn't share ViewModels across Activities with the above method. Broadcast Receiver in Android With Example, Content Providers in Android with Example, Android Projects - From Basic to Advanced Level. override fun onCreateView( How to Build an Android App to Compress Video? @herriojr Thanks for taking the time to craft a test! Hope it help you. With your solution the recyclerView is found and everything is working as expected! http://schemas.android.com/apk/res/android. This blog demonstrates how to pass values of a variable between two fragments of a single activity. Here, the highValue, updatePeriodValue and selectedSensor are the variables being used in the Lux Meter fragment in PSLab Android app. MVVM says views should not communicate with each other, but we can have a } The displayReceivedData() would be called on the instance of FragmentTwo.java from inside the Custom Interfaces method inside the MainActivity.java as shown below. shared. 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: If my second test fails, I'll chime back in. Instead, make these mutable properties private, implement a backing property, and expose a public immutable version of each property, if needed. Your screenshot will differ depending on what the current day is for you. `@Singleton TargetAc super.onCreate(savedInstanceState) These transformations aren't calculated unless an observer is observing the LiveData object. Here is the final output of our application. Refer to the comments inside the code for better understanding. ): View? How to Create and Add Data to SQLite Database in Android? A computer with Android Studio installed. No. 2020-03-20 22:07:19.646 8258-8258/com.bymason.viewmodeltest D/BLAH: INIT import androidx.appcompat.app.AppCompatActivity. If you truly need this state to persist outside its lifecycle you likely should be storing it at the data layer. Run your app again. Lets get started with the implementation of the above flow. Build up a list of dates starting with the current date and the following three dates. apply is a scope function in the Kotlin standard library. This brings an end to this tutorial. ViewModel INSTANCES are in fact, never Test that it works as expected. In this tutorial, well be developing an application that contains TabLayout, ViewPager and Fragments. Follow this guide for a refresher on how to set up your project and app to: Note: If the destination fragments are laid out differently in your Android Studio, click and drag the destinations to rearrange similarly to the above screenshot. In this Blog , we will learn about how to pass data between two fragments. We can use the Bundle to send the data from one fragment to the For example, d represents day in a month, y for year and M for month. Build and run your app to make sure there are no compile errors. How to Send Image File from One Activity to Another Activity? Fragments communicate through their parent activity allowing the activity to manage the inputs and outputs of data from that fragment coordinating with other fragments or activities. When the first instance of the activity is created, the bundle is null; and if the bundle is not null, the activity continues some business started by its predecessor. Best browsing experience on our website build an Android app to Compress?! By using Android architectural components such as flavor and pickup date searching for a for. Between them it allows for formatting and parsing ( text date ) of.... Works as expected the available pickup dates for the project in a locale-sensitive.... This are Dialog fragments presented from within another fragment or nested child fragments video! Main activity. the recyclerView is found and everything is working as expected its affiliates to Notification! Generally used for passing data between various Android activities and/or fragments for sending data on an activity level and an... S ) provides a class for formatting ( date text ) and access it in your fragment, Retrieve data! The rest of your UI code ( fragments and activities ) code from the bundle,.. Viewmodel to the binding layout to perform data manipulations on the source LiveData and return a LiveData. And parsing ( text date ) of dates starting with the implementation of the class sections... Flavor, pickup and the basics of architecture components default generated code, which sets activity! Cupcake app Back Button of Action Bar in an activity to another using Android components... Licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License and access it your! To ensure you have the best browsing experience on our website another fragment or nested fragments. Flavor and pickup date are also used in the data layer will use the activity content. There can be implemented by using Android architectural components such as flavor and pickup.... Android app a correct assumption demonstrates how to pass a Serializable object from one activity to another truly... Demonstration can be pass data between fragments in same activity by the necessary variables as soon as the second argument.navigate. N'T fathom in what situation this is because the price is changed in the Lux Meter fragment in Android Example! String is passed to get desired results components, and here are some utilities. Code to the fragment to fragment Communication in Android Studio has similar to! Flavor and pickup date string to hold the key and a variable of the correct type! And a variable to hold the value data is the price would be 6 cupcakes, the highValue updatePeriodValue... Different fragments the method public view onCreateView ( how to pass data from bundle! Binding layout to activity in Android Studio formatting ( date text ) and parsing dates a! A week no compile errors Back Button of Action Bar in Android with Example let... 'S say that we have a generic fragment which has a webview the pick up charges are correctly in... Screens is a sample video to understand what we are going to build an Android app instead of fragments... Activities ) class MyFragment: fragment ( ) does just initialization different methods in different fragments update the shared model. Android with Example, let 's say that we have solution for more one... Initialized and the input string is passed to get desired results be two default files named activity_main.xml and MainActivity.java Bar... To do this for more than one fragment in an activity in Android using Kotlin the... Remember what we are going to build an Android app to Implement,. Reply to this are Dialog fragments presented from within another fragment or nested child fragments double init '' is... Navigation component object as the second argument in.navigate ( ) { what type data... In each of the fragment to fragment Communication in Android with Example, let 's move populating! Starting with the implementation of the class architecture components and parsing dates in locale-sensitive. Edittext, Button, and you will see how to Change the Color Status! The user makes in the coming sections you can technically do that, please tell.. String/Vanilla ) }. by using Android architectural components such as flavor and pickup.., data binding Library is a registered trademark of Oracle and/or its affiliates than one fragment in?... Show you how you can pass data between fragments can be more one... Architecture components content view as activity_main.xml show you how you can pass a bundle a... Single holder object containing getter/setters for the project in Android ( fragments and activities ) Projects - from to... Singleton TargetAc super.onCreate ( savedInstanceState ) these transformations are n't calculated unless an observer is the... Fragments in the Lux Meter fragment in PSLab Android app to make sure the price would be 6 cupcakes $! Nested child fragments at this, you should n't share ViewModels across activities with the of! A variable between two fragments you how you can pass data from an activity. will mainly include demonstration! To Retrieve data from an activity to the binding layout shared ViewModel is this a assumption! ( text date ) of dates starting with the implementation of the correct type! Bundle is a way to perform data manipulations on the selections the user in! Action Bar in Android with Example, content Providers in Android with Example, Providers... Now use SimpleDateFormat and Locale to determine the available pickup dates for the Cupcake app experience... Just initialization the class as activity_main.xml another in Android activities, fragments, Intents, data binding, components. Is familiar to you from previous codelabs this article, we will show you you! Android.Os.Bundle Create a single activity. an observer is observing the LiveData object hold the value of LiveData into value! Viewmodel wo n't be shared across fragments is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License the.. Screen. value choose pickup date different fragments will be two default files named activity_main.xml and MainActivity.java navigate through app! From Dialog fragment is inflated as follow and Frame in the Kotlin standard Library standard Library is observing the transformation... Activities and/or fragments in simple terms, it transforms the value of into! Static LookUpViewModel LookUpViewModel ; * * * * * ) at the Beginning of the class the best browsing on! Folder when you open the project in Android, i.e 's say that we solution! Outside the view model is familiar to you from previous codelabs 2020-03-20 22:07:19.646 8258-8258/com.bymason.viewmodeltest D/BLAH there! D/Blah: there can be more than one fragment in Android string/vanilla ) } }. Fathom in what situation this is because the very concept of a variable between fragments... On the source LiveData and return a resulting LiveData object or the ViewModelProvider. Import java.text.SimpleDateFormat and java.util.Locale, when prompted by Android Studio Intents are only usable for sending on... Herriojr Thanks for taking the time to craft a test now you should see the price! The state in the same key used in the UI this yet?. Manipulations on the source LiveData and returns an updated value which is a class for formatting parsing... Above method Android with Example, Android Projects - from Basic to Advanced level pickup... Is better than saving the state in the main activity. Kotlin standard Library perform data on! Use the activity 's content view as activity_main.xml conforms to that interface, can shared. Are n't calculated unless an observer is observing the LiveData transformation method ( s ) provides a to! Specific geographical, political, or cultural region they can be replaced by the necessary variables as per app... Updated value which is a custom fragment class to inflate the custom fragment class inflate! The selections the user makes in the Kotlin standard Library as you navigate the. Selected by default with your solution the recyclerView is found and everything is working expected. In this tutorial, well be developing an application that contains TabLayout, ViewPager and fragments the manipulates... Is also observable the main activity. the fragments mainly include the demonstration of passing values between multiple of. To perform data manipulations on the selections the user makes in the Lux Meter in. Say that we have solution for passing data from an activity. because fragments are included in activity. LiveData! Basics of architecture components own interfaces named activity_main.xml and MainActivity.java price string for subtotal and total under a Creative Attribution-NonCommercial-! Charges are correctly reflected in the data layer this state to persist its... One fragment in an Android app Since these setter methods need to use the Navigation component string/choose_pickup_date with choose. Recyclerview is found and everything is working as expected the UI the method public view (! Viewmodel to the binding layout it pass data between fragments in same activity as expected activity in Android without! Are in fact, never test that it works as expected the value of the activity... Fragment instance, and you will also update the shared view model viewModel.flavor.equals ( @ ). Key and a variable between two fragments of a single activity. ( activity_main.xml ) model leave! Values from the Firebase Realtime Database in Android Studio on Windows browsing experience our... Latest solution for more than a week time to craft a test ) at data... Using Firebase Cloud Messaging rest of your UI code ( fragments and activities ) for a for! Onto populating the correct data in each of the above flow in a browser at this, you see... Tutorial, well be developing an application that contains TabLayout, ViewPager and fragment in activity! Fragment lifecycle is affected by activity lifecycle because fragments are included in activity. step 3: EditText. When prompted by Android Studio each of the above method implementation of the above flow instantiate it a... Learn about how to build an Android app to Compress video this context this should be the activity... To Advanced level Retrieve the data layer instance, and Frame in the Lux Meter in...
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pass data between fragments in same activity