How to get activity context in adapter android kotlin. color); According to the documentation:.

How to get activity context in adapter android kotlin open class CargoListAdapter( private val context: Context, private var list: ArrayList<Cargo>, private val onClickItem:(pos: Int, viewId: Int) -> Unit ) : Getting activity from a fragment in Kotlin is optional (might be null) so the type must be Activity? then you have to safecall it like activity?. best way to use context in fragment. context If you are using kotlin then the context will be already defined in the fragment. If your are inside Activity or Service then context is there. NOTE: In case you are tempted to pass activity context as a dependency, try to use application context or rethink your use-case. How to get the Context of an Application in a Fragment. Build; How to get reference of Activity in the Adapter class. Basically Adapter acts as a bridge between the UI component and data sources. itemview. setOnClickListener { view -> showUpdateDialog(view. getApplicationContext() Get Original context : getBaseContext() RecyclerView is used in many android applications to display the list of data within android applications. context = context; } Share. title. Note 2: I need the context of the test project, not the context of the actual application that is tested. Fragment, it will return the same thing as the getSupportFragmentManager() method in Activity would. I want to read data from SQLite database. At present, I use mLifecycleOwner = mContext as LifecycleOwner to get LifecycleOwner, it can work, but I don't think it's a good code. Now, you can get your current activity from application or Activity context like that : Activity currentActivity = ((MyApp)context. But if you do have something like a constant that needs a Context, this is how you could do it: How about Fragment? I've injected Context into Fragment(with @ActivityContext attribute), now I need Activity. SAMPLE CODE. This is an abstract class whose implementation is provided by the Android UPDATE : December 26, 2019. If you want the activity in your adapter you would need to pass it in when you construct the adapter and save it as a class member (example below), or check if your adapter base class already can provide it via getActivity() or getContext() or a similar method. Step by Step Implementation. class), basically you have to define Context in first parameter and destination class in second parameter. I want to use getWindowManager() in my MainActivity, but I don't want to write this method directly in it. In my example, the ListActivity that will display our custom ListView is called OptionsActivity, because in my project this Activity is going to display the different options my user can set to control my app. edit. There you can access context easily. context, "Your Message", Toast. It is deprecated in the M Developer Preview. How about Fragment? I've injected Context into Fragment(with @ActivityContext attribute), now I need Activity. When I try to call getSystemService from the non-Activity class an exception is thrown. I need this to load some files from assets from the test project. Main Activity). 12. The data can be passed to other activity using intent putExtra() method. In an activity, you can get by using the this keyword. View rootView = ((Activity)_context). What if I want to create custom dialog and I want to inflate view for it, or what if I want to have Toast message with custom view that is shown from a service, I only have the context from the service I do not have any activity but I want to show custom message. or cast (AppCompatActivity) context, when context is an instanceof AppCompatActivity. PreferenceManager. This would help you to have cleaner code and using context in fragment/activity is much easier. The only one I would not recommend is using getBaseContext(). In the Adapter Class: cannot cast 'android. ViewHolder, position: Int) of Adapter you can get activity by holder. onCreate(Bundle) will be called after this. this. getFragmentManager (i need use getFragmentManager() in my adapter. Of course, I know about getActivity() (Kotlin activity) in the Fragment, but is the second way okay or cause I have Context, it's better to use it to access to the activity? – I would argue that stating a val initialized Object as "Immutable" is incorrect - it is read only, you can mutate a val Object, consider a val initialised class which has setter methods for internal var Objects, you are free to mutate the object. startActivity(new Intent(mContext, NVirementEmmeteur. Data is passed as extras and are key/value pairs. It is ViewHolder, position: Int) {val context = holder. getWindow(). setAdapter(new EfficientAdapter(this)); within adapter: private Context mContext; public EfficientAdapter(Context c) { mContext = c; } Now use mContext to call Intent. class UserAdapter( private val userList: ArrayList<UserModel>, val context: Context, val handler: (UserData) -> Unit // passing a function that takes a UserData instead ) : RecyclerView. Note that select Kotlin as the programming language. ) which was generated by R by using its given name (e. Create a context of the adapter class by " Context mConext"; or "private WeakReference<Context> mContext;" 2. support. ViewHolder> { private List <Article> articles; private int rowLayout; private Context mContext; WebView articleView; private static final int MENU_ITEM_VIEW_TYPE = 0; private static final int NATIVE_EXPRESS_AD_VIEW_TYPE = I have two different arrays that I would like to be able to display based on the activity/fragment that is being shown(the final app would have 4 arrays which is why I don't just want to make another adapter for each array). I will explain how you can implement it for Overview. MyViewHolder>() { interface private fun showUpdateDialog(context: Context) { val builder = AlertDialog. Try to define the interface between your adapter and fragment and call your interface method in the adapter and implement the interface in activity/fragment. How can I get LifecycleOwner from ListAdapter?. A linearLayout is a view, so you have to call the activity context. Pass Context as an argument to YourAdapter and keep it as class field. There is a great tool for that -- Dagger by Square. In your adapter declare this: private val activity : MainActivity = context as MainActivity replace MainActivity with the activity's name and context is the activity's Context passed to the adapter as a parameter (I believe it exists). An Activity should only be started using an Intent and it's the Android OS's responsibility for instantiating it. ViewHolder>): RecyclerView. The Classic way: The adapter should expose an interface whose implementation would later handle e. ViewHolder>() Is it possible to not pass items directly and get them from adapter? I don't want to pass items again and want to get them from an adapter. getContext(). Here is my MainActivity code. How to use TabLayout with ViewPager2 . I would rather suggest to have an interface defined in your Adapter class which would be implemented by the Fragment class. Adapter<YourAdapter. * Done!! now you may direct find your widget using their id. 9. RecyclerView; Just position or put data you need to get from activity. It provides Activities, Fragments, and Services access to resource files, images, themes/styles, and external directory locations. ViewHolder>() { private var mContext = context private var mList = list // to call activity method do following // StudentList is activity (mContext as StudentList). Context. method(context)}. askMicrophonePermission(this@MainActivity) Then Pass Context. For A toast provides a simple popup message that is displayed on the current activity UI screen (e. , YourActivity. I try to pass my data from the adapter to my other activity with a putExtra but when I click on an Int): ViewHolder = ViewHolder( LayoutInflater. I can get it to work in the onbindviewholder using holder. private Context context; // Adapter public YourAdapter(Context context,. Builder(context) // } Then you can get a context to pass from your binding root or the view passed to your click listener: holder. To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. nepalpolice. A code snippet using getIdentifier() method would then be:. listviewCoordenacoes. Follow When you create the adapter in your activity: YourAdapter adapter = new YourAdapter(. Get it from View object. A more Kotliny way to do it is to ignore interfaces and just pass a function instead. Solution . context val intent = Intent( context, EventDetail::class. Unresolved Reference: context inside RecyclerView adapter You can get context a few ways: By the Activity, using Your_Activity_Name. About; Android Kotlin: Trying to retrieve the context in a fragment results in type mismatch. lifecycleScopewill be available in UI component . Now to resolve this problem we have to pass a new constructer along with id like as :-getDrawable(int id, Resources. java) (where this is the Context to retrieve the Service from. First of all, open Kotlin project in Android Studio. DecorView. id. Firstly, I would highly recommend reading through this Stack Overflow answer about how to use startActivityForResult(). inflate( In my application I've created view click interface to detect clicking on adapter items into parent activity. val context=holder. UPDATE 5. here is my code of Fragment:-class AuditFragment : Fragment() { override fun onCreate(savedInstanceState: Bundle?) { super. LAYOUT_INFLATER_SERVICE) as LayoutInflater val mBindingDeno: LayoutDenominationBinding = DataBindingUtil. not a Good design pattern ; and also a Bad practice to follow. OnClickListener, you should be able to just use this as the context. you should build your data outside the adapter and once built then notify the adapter . One for your application (Let's call it the BIG one) and one for each view (let's call it the activity context). public class App extends Application { public static Context context; @Override public void onCreate() { super. applicationContext as Activity, arrayListCoordenador) binding. this); Share As a best practice keep your dialog logic in the activity. content. OptionViewHolder>() { Option 1: Instead of passing activity context i. TL: DR: val is equivalent of final keyword in Java, however its internal Previously I'm using onAttach (Activity activity) to get context in Fragment. Specially in Fragment You shoud ensure that getActivity() or getContext() are not providing null value. How to get an adapter item object from a LayoutManager view (RecyclerView) 213. To obtain the context within an activity, you can simply use the this keyword. Is there a way to do this without referring specifically to the Activity? I know I can do myActivity. Check : Migrate from ViewPager to ViewPager2 Check : Create swipe views with tabs using ViewPager2 UPDATE 6. 7. The advantage of this approach is, that I can always use the same Interface to plug model and view independent of the usage of a view I'm having trouble offloading tasks from the main Activities OnCreate method onto another class to do the heavy lifting. By the application, using getApplicationContext(). Edit - since your Activity is implementing DialogInterface. getDefaultSharedPreferences(context); prefs_name=new UPDATE 7. If you need something universal, have a public static variable in your main activity and assign the application context to it when your In Kotlin, there's a nice & simple wrapper-based solution – just copy & paste the code into a new AppPreferences. Adapter<ArticleAdapter. For example: Context context = this; getActivity() is used if you are inside fragment. java) context. This is wrong. itemView. 2015):onAttach(Activity activity) is deprecated, use onAttach(Context context) instead, it works as intended. synthetic. As I am inside the Custom Cursor Adapter, I am unable to get the Activity to use the runOnUiThread method like getActivity(). Therefore you can't startActivityForResult from context. So easy isn't it? When you use. (Disclaimer - haven't done Android If you want to use getString Outside of a Context or Activity you should have context in constructor or method parameter so that you can access getstring() method. getColor(context, R. I know that it means that I need to get the reference of activity context that called it and then run on that thread, but I am not sure how to access it from Adapter code. Now to get context in Fragment we can use onAttach (Context context). ViewGroup. In your case this might work for you: view. In other words, every time you need to pass the context just use "context" as in @{Object. ArrayList, HashMap, SQLite, etc. Simply call getSharedPreferences() method without context reference. So there is no need to pass both context and activity. Adapter code. Here Simple Adapter is one type of Adapter. 2) You don't need to create it through module. supportFragmentManager in kotlin – Supun Ayeshmantha. {val context = holder. getSystemService(this, BluetoothManager::class. string. startActivity(intent) or you can make a listener that your in Kotlin, putting Context/App Context in companion object still produce warning Do not place Android context classes in static fields; this is a memory leak (and also breaks Instant Run) or if you use something like this: companion object { lateinit var instance: MyApp } The getContentResolver()method is also used when you query a Contact, using a Cursor object. Method 3 : KOTLIN BASE. override fun onCreate(savedInstanceState: Bundle?) super. 2. this as the context. My Str. finishMe() I found that the useful getResources(). But how I launch lifecycleScope inside onBindViewHolder? import androidx. Now I need to perform some network operation in Recycler view adapter. your_item, parent,false), clickListener ) //And How to get the variable value from adapter to activities in android kotlin Its Best solution is to pass the reference of your Context to the Adapter from Your Activity (or) Fragment. Add Application Context add Activity Context both are different. LifecycleOwner (or any other class which does that). findFragmentByID(R. public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super. because RecycleView extends android. 4. fun askMicrophonePermission(context: Context) Interface to global information about an application environment. While calling it from a different activity just get the context of that activity and while creating object of sharedpreference class pass that context. public UsersAdapter(ArrayList<User> items , Kotlin: val fm = (context as AppCompatActivity). public int getIdAssignedByR(Context pContext, String pIdString) { // Get the Context's Resources and Package Name Resources resources = Assuming you have viewModel shared by for your Fragment container activity & child fragments, you can pass that same viewModel to your recyclerview adapter. The context variable will be overridden by an explicit variable declaration with that name. Improve this answer. showToast(message: String, duration: If you wannt get it inside an activity or fragmnet, then: getContext(). Problem to get Context in FragmentView Kotlin. Get the activity context in adapter and then with this context call the dialog function present in the activity. public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { MartianDataBinding binding = How to do latest jetpack "View binding" in adapter, for automatically binding the views. Ready for Android Classes Activity, Fragment & Service are extended with the KoinComponents extension. os. This is an abstract class whose implementation is provided by the Android system. Copied from Stackoverflow: How to get a context in a recycler view adapter . It is an "interface" that allows access to application specific resources and class and information about application environment. You can request user input in a number of ways, but if you want to use a new Activity, as you mentioned, we can use startActivityForResult() to launch a new activity and return the input from there. As value you can use the primitive data types int, float, chars, etc. Then you can make changes to the preference or even access saves data from there. acess the viewmodel methods from the calling activity/ fragment instead of using it the recycler view. 1. The first answer definitely works but it couples your current fragment with the host activity. When calling Toast inside android fragment: 1. But when I call the Adapter class, I don't know how to pass the context variable: binding. activity_main. There are two list item types, one list item type just has a TextView Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Get context from a View and call getString: holder. To create the adapter, simply pass 'this' if created from an activity, or getActivity() if created from You can directly access application context by calling getApplicationContext() or by calling on activity context like context. Adapter<QuestionAdap. If you are getting the current instance of Fragment from the parent activity you can just. getApplicationContext(); public class ArticleAdapter extends RecyclerView. widget. from(activity). Permission(). Id. According to Intent method in source code -. NetworkInfo; import android. e. In below example, I have row_payment XML file for RecyclerView item and the generated class is RowPaymentBinding so like this. However, globalContext can later refer to an activity that no longer exists while detached or after being reattached. adapter = new ArrayAdapter<T>(getApplicationContext(), R. material:material:1. class CartAdapter( cartList: ArrayList<ProductData>, private val itemClickListener: ItemClickListener // This is the interface implementation // that will be especially the bit on Activities in the Application Components section. isClickable = true binding. activity_main); String d= new Inside override fun onBindViewHolder(holder: RecyclerView. The different elements in a query (as shown below) represent what kind of contact details you want, and if they should be ordered, etc. finish() and it won't crash with an NPE if activity is null. I've created an extension function that I use to get the adapter: fun Context. To call it from an activity, simply call "this". To debug, split this up In your adapter there need to be instance of your fragment, so change it like: class QuestionAdap(val context: Context, val question: Question, fragment: Fragment) : RecyclerView. Downcasting is risky . You gain access for the Kotlin extensions: by inject() - lazy You should not create a separate ViewModel for adapter. It worsk great when using in Activity. LENGTH_LONG). clicks on an item in the RecyclerView. getContext() and getActivity() with FragmentActivity. EDIT. However, you can store Context (as long as it is the application context) as a static Yes it's global and you can start Activity and Services from any context (Service, Application, Activity and etc. May 5, 2019. Truly Immutable is initialized once and closed to change. lifecycle. Note: The test is NOT instrumentation test. xml file inside LinearLayout The Adapter acts as a bridge between the UI Component and the Data Activity is a class that extends Context. I'm currently working on an Android app, and working with serializing files. The onAttach (Activity activity) method was deprecated in API level 23. findViewById(R. Adapter <MainAdapter ArrayList<String> list_add = new ArrayList<>(); ArrayList<String> lista_show; private Context context; String t; public MainAdapter (ArrayList<String class BaseAdapter<T>(private var items: ArrayList<T?>, private val adapter: RecyclerView. Adapter<FeedAdapter. So by using AndroidViewModel Class you will be provided by Application Context which wont (hopefully) be causing any memory leak. I have create ViewModel using activity context and but not working proper I am a beginner in Kotlin android development and not able to call a fragment function from adapter. We can dynamically add or remove data from our recycler view. kt file and follow the 4 TODO steps outlined in the code:. what I am trying to do is implement an alert dialog on an adapter item. I managed to make it on java but I am trying to make it in kotlin. Content); In Raw Android it'd look something like: View rootView = ((Activity)mContext). By the way, inside an activity, you don't need to use context, getSharedPreferences() method is already present in Activity. this replaced by this@MainActivity; You should set. FeedAdapter myAdapter = new FeedAdapter(this,myDataset); Obtaining the Context in the constructor has (at least) three advantages: You only do it once, not every time, getView() is called. getParent(); As stated in the comments by the OP, this is causing a NPE. context as FragmentActivity The getParent method returns a ViewParent, not a View. Android custom view using custom binding adapter listener method with parameter. You can't reuse dialogs, because Android destroys and recreates the Activities/Fragments that host them according to various lifecycle processes. Adapter constructor: public ItemsAdapter(Context context, Short extension for Kotlin Method returns absolute position of But in this case, it doesn't make sense, because a Dialog is transient. edit object AppPreferences { Pass activity context from activity and use same context while calling Intent. context. from(parent. In kotlin you can try this to inflate layout inside linear layout using databinding. Best for achieve click listener in Kotlin(Mean Without findview by id you can click or intalize the textview, button, spinner etc) Step: - Go to your Build/gradle; Add this line : - id 'kotlin-android-extensions' Then Sync the project. Do NOT try to instantiate an Activity using new. 3) If your adapter doesn't need any dependencies (as here you have no arguments in your constructor), you can create the MyAdapter instance yourself GridLayoutManager(context, numberOfColumns) // grid; Then apply the layout using Kotlin's apply() which removes repetition. Of course, I know about getActivity() (Kotlin activity) in the Fragment, but is the second way okay or cause I have Context, it's better to use it to access to the activity? – The value for context is the Context from the root View's getContext(). ) then Adapter comes into the picture. net. R. Use right context. . Kotlin: Passing So try to pull your Resources with getResources() with your Context. ; Use dependency injection to inject Context when you need it. this to the singleton class, you can pass applicationContext(). And I have a function inside my ViewModel that starts an Activity. findViewById(android. Binding views in android using kotlin. If you set them in your ViewHolder you won't know what position was clicked unless you also pass the position into the ViewHolder. each item in the listView should look like as shown in the item. This was after numerous failed attempts at using getApplicationContext() and of passing the context in as a parameter to constructors, none of which gave Activity. Step 1: Create a New Project in Android Studio. Having said that, if you know what you are doing, use @ActivityContext annotation for passing the If you are not directly inside Activity, for example inside an OnClickListener, you can get the current context by referencing with Activity name like MainActivity. – How to do latest jetpack "View binding" in adapter, I have used the new view binding and is is working fine for Activity and for Fragment. ContextCompat. As pskink pointed out ViewHolder has a getPosition() so the way you were originally doing it was correct. color. show() To start an Activity in java we wrote Intent(this, Page2. main. toString() but this is just a less efficient way of hard coding "myActivity" since I'm making a static reference to my Activity. Stack Overflow. google. If outside then try to pull Context first with getApplicationContext() and on that pull the resources and pull your String in the end on it. OnClickListener as an anonymous class. An intent contains the action and optionally additional data. requireActivity() public final FragmentActivity requireActivity() { FragmentActivity activity = getActivity(); kotlin android fragment startActivity and context. Use this code to use context object . Now, when I do this I get a message (on '// throws error' line in above code) that - Only the original thread that created a view hierarchy can touch its views. I want get that data in fragment. Is it okay to have an onClick call inside a BTW there are many other cases that we may need context in ViewModel that's why Android has a version of ViewModel that has context! – Alireza MVVM+Kotlin+Databinding best practice. setOnClickListener{} I suggest you handle your fragment transaction in your fragment/activity. gradle file. Commented Nov 25, 2022 at 4:57. implementation 'com. The getView method like this public View getView(final int position, View convertView, View I am trying to create a ListView with customized layout. getColor(R. content) Fragment frg = null; frg = ((Activity) context). onCreate(savedInstanceState) } override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, class StudentListAdapter(context: Context,list: ArrayList<Student?>):RecyclerView. context} Option 2: pass context from Activity/Fragment. view. val fm=(holder. You may pass activity as context and then you can use the context to run on UI thread as follows: ((Activity) context). Example: Syntax: // to get Context Context context = getApplicationContext(); // message to display String text = There is a great tool for that -- Dagger by Square. But still doing so will make the testing difficult. I had the same issue. RelativeLayout r = (RelativeLayout) ((ViewGroup) this. Theme object) is only available in the M Developer Preview. You get the result in the enclosing Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I want to know how can I get MainActivity's context and it's functions globaly (if that's possible) The (but implementing this for Android Activity class is a bit tricky ) Share. – hasan_shaikh. However, the replacement method (a two-parameter getColor() that takes the color resource ID and a Resources. ConnectivityManager; import android. How can I get the Activity reference and execute the runOnUiThread method from my CustomCursorAdapter? public class FeedAdapter extends RecyclerView. bluetoothAdapter(): BluetoothAdapter? = you need a context for intent so you can get it form the activity or fragment that are associated with this adapter and pass it to your intent or you can get it from any view in your inflated layout like this. class)); There are two different contexts in Android. Its good practice to keep the fragment decoupled from the host activity in case you want to use it in another acitivity. Set your onClickListeners on onBindViewHolder() and you can access the position from there. recyclerView) as RecyclerView rv. startActivityForResult(intent, REQUEST_FOR_ACTIVITY_CODE); Beware that context must be an activity context or this code will fail. runOnUiThread(new Runnable() { public void run() { I found a way to get the Activity to a non-activity class that I have not seen discussed in forums. layout. in the code, i used . Following steps are used to create TextView in Kotlin: Add a TextView in activity_main. getContext() in Fragment. You can use it for other purposes too, when And now you can use the variable mContext from anywhere in your adapter. Use below dependencies. application' id 'kotlin-android' id 'kotlin-android-extensions' } apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' after that go to your Activity file and write this line; import kotlinx. The key is always a String. How can I achieve this without starting a new activity. You can reference an outer context when you define your DialogInterface. public int getColor (int id) This method was I need to acess my room DB inside onBindViewHolder. You need normal instance. Get context from detached fragment? Starting with a context, the root view of the associated activity can be had by. 0. 1. I know this has already been answered but I wanted to give a more complete example. getApplicationContext()). Android TextView is simply a view that are used to display the text to the user and optionally allow us to modify or edit it. container); This actually get's the current instance of fragment that's populated on the view. A fragment is typically attached during onCreate(). I am able to see the ActivityHomeBinding and FragmentHomeBinding files after enabling the viewBinding in build. app. string_name); If you want to get it from a class outside of activity or fragment where you don't have the activity context then use application context: getApplicationContext(). Option 2: If you really have to use activity context, then when the activity is destroyed, ensure that the context you passed to With this extension function for Toasts, you can call them in Activities as well as Fragments, you can pass this as Context for Activities or getApplication() for Fragments, also it's generated with Toast. getSystemService(Context. supportFragmentManager. MODE_PRIVATE import android. class LocalAdapter (val context: Context): RecyclerView RecylerView as ViewPager (Horizontal Swipe of Fragment Pages) Android RecyclerView With Different Layout / View Type (Kotlin) import android. cdp; import android. methodName() } Understanding Context in Android programming is crucial as it provides access to resources, First of all, open Kotlin project in Android Studio. val rv = view. arch. It is basically an You should get the activity's context between onAttach and onDetach so I like adding this to my fragments: Get Fragment context in Android. The getView method like this public View getView(final int position, View convertView, View Only if the given Context extends Activity (Post-Honeycomb) or FragmentActivity (pre-honeycomb). You need a reference for the Context in the adapter and call the activity: Intent intent = new Intent(context, TargetActivity. by android:id="@+id/. Any ComponentCallbacks class is accessible for the Koin extensions. You need to change the example it to myContext. onAttach (Context context) Called when a fragment is first attached to its context. context) } or To learn more about RecycleView in Android you can visit this article RecyclerView in Android with Example. @AlexBerdnikov Using Activity context inside the viewmodel can cause memory leaks. inflate(R. Kotlin fun Context. Adapter<RecyclerView. My example code was written assuming you're inside an Android Activity, which inherits from Context, but if you need it somewhere else, you need to have a Context available somewhere. Following this approach, I wrote below code but still no luck. I have a method that serializes a Java object into a file that takes a Context parameter. SharedPreferences import androidx. ViewHolder> { private List<Post> mDataset; // Provide a reference to the views for each data item // Complex data items may need more than one view per item, and // you provide access to all the views for a data item in a view holder public class Passing data from one Activity to Activity in android. context} Option 2: pass context from Activity/Fragment class LocalAdapter ( val context : Context ) : RecyclerView . LifecycleOwner. An Activity is a special-case Android class and should NOT be treated like a regular Java class. Currently I'm facing a problem on finding a way to pass the variable from the adapter going back to activities because i want to have a floating check button and display what are the selected users from that adapter. Currently I plug the real model into the view and treat the view model as internal implementation. 1) You shouldn't mark the MyAdapter as @Singleton. This is Gradle File plugins { id 'com. adapter = CoordenadorAdapter(requireContext(). I had to load the same fragment twice keeping one on backstack. (I prefer the third option, getting the context from the view. "create interfaces in your recyclerView to get called in the calling activity or Fragment " . FindViewById(Android. . Hence, for me the View is the place to create the view model, so I need the lifecycle. Just mark the MyAdapter constructor with @Inject annotation. Context does not implement android. listi_tems_layout, topicsList); but it is not working because the constructor of the ArrayAdapter<T> accepts the second parameter as int Android; Get Context in RecyclerView Adapter. getParent()). After This is how auto generated code works if you use "Convert Java -> Kotlin" converter in Android Studio viewType: Int): ViewHolder { val layoutInflater = LayoutInflater. Use this. context but since the arrays aren't the same size I I would argue that stating a val initialized Object as "Immutable" is incorrect - it is read only, you can mutate a val Object, consider a val initialised class which has setter methods for internal var Objects, you are free to mutate the object. ScreenCaptureCallback; AlarmManager. Context; import android. val inflater: LayoutInflater = LayoutInflater. ViewHolder> { private ItemType[] mItems; private MRAItemClickedListener mListener; public MyRecyclerAdapter(Context ctx, In getView() method I want to call getIntent(). Now you can finish the activity anywhere in the adapter by: activity. Binding views in android using kotlin Calling this inside onBindViewHolder is not a good idea . Window. This is what worked for me: Get Fragment context in Android. The reason the method is called simply getFragmentManager() in this case is because it is not ambigious, unlike in the case of Activity. runOnUiThread(). OnAlarmListener; I need send ArrayList list_add to activity but I don't know how I can do it if is possible share it class MainAdapter extends RecyclerView. Get Android Studio Get started; Tutorials Kotlin for Android Monetization with Play ↗️ Extend by device; Build apps that give your users seamless experiences from phones to tablets, watches, headsets, Activity. So using AndroidViewModel might be better than passing activity context to it. this (Java) or this@MainActivity Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I'd like to get the name of the current Activity to be sent along in the URI of an HttpRequest. for example you want to make a post request in your viewmodel , take the data from the recyclerview via and interface then call viewmodel. From activity: yourview. If you need it in your fragment then requireContext(). R. A Context provides access to information about the application state. I have used the new view binding and is is working fine for Activity and for Fragment. The Custom Cursor Adapter class is just a Java class and not an Activity or Fragment. In Android, whenever we want to bind some data which we get from any data source (e. v4. It wouldn't be a constant. public This is what I did. Activity mActivity=this. color); According to the documentation:. (If you cant access class "context" inside SharedPreferences) 1. My Str). name. item_basketball is just an integer ID for your activity layout - not the activity instance itself. Here is a suggestion: you can get the ID (specified e. here) How to get the variable value from adapter to activities in android kotlin recyclerview? 0. This is the main class where I start the adapter. UserViewHolder>() { package com. If you're in an activity you can use MyActivity. It also enables access to Android's built-in services, such as those used for layout inflation, keyboard, and finding content providers. xml file inside LinearLayout. getString() in that case. onCreate(savedInstanceState) } override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, In getView() method I want to call getIntent(). How do I get context from Activity in a fragment in Kotlin. onCreate(savedInstanceState); setContentView(R. It is not deprecated in API Level 21, according to the documentation. Share. But I am unable to get that data. v7. onCreate(savedInstanceState) val context: A bunch of ways. I have used getContentResolver() to query the Android phone Contacts app, looking for contact info from a person's phone number, to include in my app. g. Adapter<UserAdapter. After that you have access to the BluetoothAdapter. ) with a UI component(e. By the View, using Your_View. If you just need it in a ViewModel then extend from AndroidVeiwModel and you get it for free. You gain access for the Kotlin extensions: by inject() - lazy android. class. How to use context in Kotlin classes on Android. LENGTH_SHORT as default, so you don't need to worry to pass it as a parameter, but you can overwrite it as well if you need. core. So, now instead of extending Activity class for your activities, just extend MyBaseActivity. You can't directly implement these method like onClickListener, OnContextMenuListener etc. So how can we create ViewModel and Live data for adapter. Context import android. ViewHolder>() { //YourData like String //And we have onCreateViewHolder like this override fun onCreateViewHolder(parent: I have two different arrays that I would like to be able to display based on the activity/fragment that is being shown(the final app would have 4 arrays which is why I don't just want to make another adapter for each array). ). Commented Feb 14, 2023 at 3:19. Context' to YourFragment. A Context is a handle to the system; it provides services like resolving resources, obtaining access to databases and preferences, and so on. So we cant directly use these method. ) { this. apply { layoutManager = LinearLayoutManager(context) adapter = recyclerViewAdapter() setHasFixedSize(true) } It can also be set in XML like this: A Context is a handle to the system; it provides services like resolving resources, obtaining access to databases and preferences, and so on. Theme theme) The data binding implementation must be in the onCreateView method of the fragment, delete any data Binding that exist in your OnCreate method, your onCreateView should look like this:. MyViewHolder>() { interface . Adapter<StudentListAdapter. context as Activity. android. We can use context menu in RecycleView like this way: Yes, it's possible. – @RowanBerry getString is defined on Context. Instead of using an interface and accessing function by using Activity or Fragment instance you can use Kotlin higher order functions to make the adapter independent and use it anywhere in the code. When the view is clicked you can use getDrawable(int drawable) is deprecated in API level 22. Thanks. Check out my answer if you want to implement Carousel using View Pager2. public FeedAdapter(Context context, List<Post> myDataset) { mContext = context; mDataset = myDataset; } The pass your context when creating the adapter. Problem . lifecycleScope class What you need to do is pass the generated binding class object to the holder class constructor. 0 If in an android. ) : import android. string_name); edit(17. ListView, GridView, etc. – SpiritCrusher I am a beginner in Kotlin android development and not able to call a fragment function from adapter. Add a comment | 7 . We can pass a fun to adapter and get data from it like this : In our adapter : class YourAdapter(private val clickListener: (yourData: YourData) -> Unit) : RecyclerView. I know, in Java you can call getActivity() Skip to main content. How can adapter observe live data. TL: DR: val is equivalent of final keyword in Java, however its internal For KOTLIN. When to use Though you can start Activity from Adapter class passing a Context but as Documented it's . color_name) is deprecated. You can turn on dialog or anything need activity inside a holder. The following method doesn't work. onCreate(); context = getApplicationContext(); } } In Your Activities and in fragments Class : Based on the new Android Support Library (and this update), now you should call:. You need to cast the first call to getParent() also:. getDecorView(). yourfunction(data you got from the list) Read: "Do not place Android context classes in static fields; this is a memory leak (and also breaks Instant Run)" Do you know what context classes are? Activity is one of them, and you should not store Activity as a static field, (or it will leak memory). class CallItemAdapter( val context: Context, private val callItems: List<CallItem>, private val listener: ClickListener ) : RecyclerView. For reference see this link. class VoiceAdapters (private val aHomeViewModel: HomeViewModel, private val mPlay: PlayInterface): ListAdapter<MVoice, If you support older APIs, you should use ContextCompat. makeText(context. Also, it does not provide the Application Context, but the Activity context. Resource. context). like this. Passing activity context may lead to serious implications like memory leaks. xml posted below. context but since the arrays aren't the same size I Don't use getActivity. import android. this. getResources(). 3. You'd have to pass an instance of AppCompatActivity, which implements android. getCurrentActivity(); I am creating Recyclerview using MVVM and data binding. I strongly suggest reading about it. class Activity: AppCompatActivity { private val viewModel: AnyViewModel by lazy { //Initialization } private val adapter = Adapter(viewModel) } class Adapter(viewModel: SomeViewModel I'm creating a chat app in android using kotlin and wanted to create a group item based on registered users. Kotlin Android Fragment recyclerView and context issue. class PaymentAdapter(private val paymentList: List<PaymentBean>) : @CommonsWare: Depends on your architecture. Those methods return activity/context with a null check. class); ((Activity) context). Adapter<CallItemAdapter. Fragment; import android method you can use java equivalent of this kotlin code. getActivity(); Inside Adapter: Toast. getString(R. We can implement these methods in ViewHolder adapter class. I can retrieve a valid Context Does anyone know how can you get the context of the Test project in Android junit test case (extends AndroidTestCase). Best option would probably be to have the Fragment that instantiates the RecyclerAdapter to implement and interface like this: public class MyRecyclerAdapter extends Adapter<RecyclerAdapter. Actually can call it only from activity (this method defines in activity class, not in Context class). mckl ndozuc zosb cond vlk retn cqw ywkeomf bbsg cxwt