Xamarin android onclick. Following will do the trick. 16. In your code: Button button = (Button)findViewById(R. 2. Now for each item image there is some link which I need to redirect. // Manually register the event-handling method for // the Click event of the Button control. 11. hasOnClickListeners() after this will return true, NO my friend. then in the handler. ActionDown itself which is not really a click so I ended making a custom MovementMethod Oct 3, 2014 · 66. cs, I start out with the first view and set an onClick handler for the first button. Design. Interop. If you want to also support the navigation bar button, you need to use custom platform logic. new RecyclerItemClickListener(context, recyclerView ,new RecyclerItemClickListener. EditTextに android:clickable="true" と android:focusable="true" を追記してあげると The following code example demonstrates how to specify and code an event handler for the Click event in order to display a simple message on the Web page. The code I am using to create this click event is this: loginClick. Apr 1, 2019 · <Button android:id="@+id/buttonId" android:layout_width="wrap_content" android:layout_height="wrap_content" /> Now in your click event, you can use the Position Parameter to find out which element of the list is receiving the click even at eg: Apr 17, 2017 · This Tutorial will guide you how to make a button click event in xamarin android. setOnTouchListener(new View. But when i click on Nearbyhospital the App is force closing, in xml file of the home page May 20, 2024 · Because the default bitmap is last, it is only applied when the conditions android:state_pressed and android:state_focused are evaluated as false. TextView logout = FindViewById<TextView> (Resource. Oct 13, 2022 · Doing this, I added a button and now I'm trying to get the onClick event of it. Unfortunately, if I click on the button, I get this exception: Java. cs, I set an onClick handler for the second button (in the second view). I found out how to do that. new Label {. Main); Nov 1, 2020 · My question is similar to this question Android - Switch ActionBar Back Button to Navigation Button, but I have problems using the Java code that I changed to c#. First thing, you should register the view by calling registerForContextMenu (View view). Oct 3, 2019 · You can try to modify your code as follows. Function call I want to add: model2. May 21, 2016 · I currently have a ContentPage. SetTitle("Delete") . Using [Java. This build process takes the XML in the Platforms\Android\AndroidManifest. xaml Code 1. Id)); Sep 10, 2019 · Well you can use the ElegantButton control which is a custom control for this exact purpose. Object: public void OnClick (IDialogInterface dialog, int which) And in the Java file, we can use "onClick ( View view)" on every view without set "onclickLitener" using get the id of every button or view, as described in the following. Adapter mAdapter; with. viewHolder, int position) var item = items[position]; // Replace the contents of the view with that element. OnItemClickListener() {. Improve this question. listitem, mListItems); mPullRefreshListView. I can barely find anything on the internet / other stackoverflow forums. onListItemClick(l, v, position, id); //do something here using the position in the array. May 1, 2023 · Android : How to set onclick listener in xamarin?To Access My Live Chat Page, On Google, Search for "hows tech developer connect"I have a hidden feature that The manifest file for your . Fragment's public method not called. Here is the implementation of hasOnClickListeners() taken from android. Jul 7, 2017 · I have used following code to create label but I don't know how to create onclick event on it. AppCompatButton with id 'button_random' Apr 15, 2024 · The framework will handle routine focus movement in response to user input. <Image Source ="banking. android; Share. but button click is not working i. Forms. You have to do it by code. public class DelayedButton : Xamarin. Click += async (sender, e) =>. Button with id 'button1'' Aug 16, 2017 · 0. Create your Android solution in Visual Studio or Xamarin Studio. LENGTH_SHORT). // do stuff. Row1 ); row. class); May 27, 2018 · You only need to do subscription to the 'Click' event handler. picture_part); menu_photos. } Update: Of course you have to add. ViewHolder. → 実際にタップしてもイベントが発火しない！. Activity; import android. widget. MainActivity. onButtonClick() Is it possible? May 25, 2016 · 9. // (If its a list of some other type of object, just change the type in the (cast)): var stringInThisCell = (string)((Button)sender). OnCreate (bundle); // Set our view from the "main" layout resource. Clicking that button opens the second view, which is working correctly. This will show you how to make axml code of button and connect in mainactiv Aug 11, 2014 · Android Xamarin programmatically generated Button Click. row, parent, false); Dec 23, 2011 · 1) If your class extends ListActivity, you can override following method. SetContentView (Resource. axml (Resource. Views indicate their willingness to take focus through the isFocusable() method. public class MainMenuRecyclerAdapter : RecyclerView. settings. Mono For Android 4. Apr 4, 2013 at 12:58. Forms project. protected void ButtonClicked(object sender, EventArgs args) {. – Romain Guy. Ask Question Asked 9 years, 10 months ago. HORIZONTAL);//or RadioGroup. SetMessage("Are you sure you want to delete?) Aug 24, 2010 · Its very simple. android:taskAffinity ="". heres my xaml: Feb 26, 2018 · I would like to open a new page while pressing a button but I have no clue how this works (because I'm new to Xamarin (Android) programming). This XML file represents a single drawable resource. And also someone commented that calling View. You need to give name to your Image control in xaml. Nov 14, 2016 · When I implement it does not work. AndroidでボタンなどのClickイベントは基本的にイベントハンドラを渡せばいいのですが、どうしても SetOnClickListener を使わなければいけないとき ( ex. OK I have answered my own question (but is it the best way?) This is how to run a method when you click or tap on some text in a TextView: package com. Therefore this feature is only available for Indie and higher licences. Share. VERTICAL. lang. Add an action to the AndroidManifest. OnCreate(savedInstanceState); I may come to learn Java yet, but as most of our code is back-end, if I can get Xamarin to work then I can use largely the same code for Windows Phone, iOS, Android and even Windows so it's definitely worth giving it a try! May 9, 2019 · So I'm making a couple of assumptions in this answer. support. InflateMenu(Resource. You can Also give id on the TableRow from the axml and access it like this: TableRow row = (TableRow)FindViewById ( Resource. super. A simpler approach would be. I know what the problem is but I can’t solve it. void OnButtonClicked(object sender, EventArgs args) {. Widget (base / V4 / V7). From(parent. TextView; public class TextyView extends Activity implements OnClickListener { TextView t May 10, 2016 · java. IllegalStateException: 'Could not find method OnClick(View) in a parent or ancestor Context for android:onClick attribute defined on view class android. Oct 16, 2016 · The steps, given below are required to be followed in order to create a DropDown list, using Spinner in Android app, using Visual Studio 2015. Below is the code for my adaptor and ViewHolder. Improve this answer. From before, I use this code: AlertDialog. To change whether a View can take focus, call setFocusable(). mytoolbar); toolbar. I am a beginner in C# and I am using Xamarin Studio. now I need to handle some events of this button. EditText txtsearch = (EditText) findViewById(R. rg. Sep 15, 2015 · After that you define . Toolbar>(Resource. Context). webkit; public class Foo. Please help me in this regard. public class MainActivity : Activity, View. Jan 15, 2013 · 8. mymenu); Handle clicks To handle click events on a toolbar menu you have to implement the Toolbar. OnClickListener). NET MAUI Android app is generated as part of the . If you want to make links in a TextView clickable, you can use the android:autoLink attribute to specify which types of links you want to detect and handle. Intent logOut = new Intent(this,typeof(MainActivity)); StartActivity(logOut); }; But Click event is not working. Layout. addOnItemTouchListener(. ToolBarの SetNavigationOnClickListener ) 、IOnClickListenerを実装したクラスを渡してもOnClickが呼ばれないことがあり The simplest way is indeed using the Click event that's available on every View. Second, override the onCreateContextMenu () to add the menus and lastly, override the onContextItemSelected () to put logic on each menu. The resulting manifest file can be found in the obj folder. (AndroidとXamarin. Nov 26, 2018 · Image click event in Xamarin forms. NullReferenceException: 'Object reference not set Feb 6, 2018 · 2. OnClickListener) in the type View is not applicable for the arguments (new OnClickListener () {}) Here is my code: LinearLayout menu_photos = (LinearLayout )findViewById(R. can anyone tell me the solution where I am doing mistake. Jul 16, 2014 · I am sorry for the probably really stupid question but I am struggling with this for few hours already and I can't get it. Secondly I am assuming you are using the FloatingActionButton from one of the support libraries such as: Android. jnicho15g jnicho15g. // await DoAsyncMethod(); Aug 22, 2017 · If you want the user to go back to the MainActivity when that press the back button, then you can add a ParentActivity to your NotificationActivity activity attribute, i. activity. Club club = (Club) lv. Jul 29, 2016 · 1. FromHex("EEF2FF"); Mar 24, 2013 · Got an idea to do like below but I am getting this error: The method setOnClickListener (View. Community Bot. show(); You do not have to use any extra method. answered Apr 13, 2011 at 7:13. Android. protected override void OnCreate(Bundle savedInstanceState) {. Jun 17, 2015 · android; xamarin; xamarin. Button { public DelayedButton() { this. I also tried setting the Z-Order and attaching the click events in the Xamarin. Follow asked Jun 16, 2015 at 21:07. btn1. Important Note. xml file, and merges it with any XML that's generated from specific attributes on your classes. java. IsEnabled = true; } public int Delay May 15, 2016 · 3. onclick as usual. var tapFinance = new TapGestureRecognizer(); Apr 7, 2018 · Iam using an android project code, which load nearby hospitals and police stations when clicking the text. Step1. layout. so you should do like this: View row = LayoutInflater. This missing piece SetContentIntent (pendingIntent) did the trick. Modified 9 years, 9 months ago. com/complete-xamarin-developer-course-ios-and-android/?couponCode=YT-XAMARI Jun 28, 2023 · Hello I display the content of a table in a gridview I have an xml (grid layout) containing a button and sommes text view . setWidth(600); editText. setOrientation(RadioGroup. onButtonClick()}" /> The above code calls one method, I want it to call another one in from a different viewmodel. The code shown in this answer is a little confusing. public boolean onTouch(View v, MotionEvent event) {. There should be two java files for each activity. In your manifest, add the following attributes to the <activity> element. I googled so long time to fix this but nothing helped. Forms), I have 2 views, each with a button. I want to display a dialog alert in my Xamarin Android app (C#), and I want to do stuff to the dialog when I click on the buttons. just init value of variable mAdapter, not recreate a new repeated variable mAdapter. Code: <Button android:onClick="@{() -> model. Try something like this: protected override void OnConfigurationChanged(Configuration newConfig) {. 2) Handle click event of row in getView() method. Apr 27, 2017 · I'd like to see the highlight when I click the item in ListView but It doesn't work. In each activity the fragment may belong. Mar 17, 2012 · During the Mono for Android build process, Android Callable Wrappers are created for every Java. Just add android:onClick attribute to your tag. BindingContext; Dec 30, 2017 · Step 1 - Create Android Project. They work perfectly fine on the first click but seem to crash out when I click them again (eg multiple login attempts). Widget. I'd like ro run a function after the Enter was pressed. Step 2. I miss some information like what is submit, but your code should look like: final RadioButton[] rb = new RadioButton[5]; RadioGroup rg = new RadioGroup(this); //create the RadioGroup. May 28, 2015 · Xamarin. If you don't want to use Commands, you can use the Button's Clicked event. JavaScriptEnabled = true; // load the javascript interface method to call the foreground method. public void onClick(View v) {. When I press @id button1, it should navigate towards the page settings. cs: WebSettings settings = webview1. Settings; settings. Button with delay in click event, than add it to your xmal. : And thus the line: Would add the MainActivity to the back stack. May 15, 2020 · so i'm creating an android app using Xamarin. . base. Jun 15, 2022 · The OnBackPressedDispatcher is already going to be using the Android T specific API internally when using Activity 1. Click += delegate {. Viewed 2k times Java documentation for android. 今日はそんなsetOnClickListenerな話です。. android:onClick="onClick". recycler); recyclerView. 余計な項目が多くて見にくいんだけど、 android:onClick="onClickEditText" を指定しただけ. Views). 1. os. By default it works on iOS and on Android physical back button only. //webview1. OnTouchListener() { public final static int FINGER_RELEASED = 0; public final static int FINGER_TOUCHED = 1; public final static int FINGER_DRAGGING = 2; public final static int FINGER_UNDEFINED = 3; private int fingerState = FINGER_RELEASED; @Override public boolean onTouch(View view, MotionEvent android:layout_y="10dp". I have a project I have created on Xamarin for Android and I am having a problem with my buttons. Just to clarify, View does not have a static performClick () method. 16 How to set onclick listener in xamarin? 0 Run time not able to fire the button click event for dynamic buttons C# Xamarin Android Feb 28, 2020 · If you want to call html JavaScript function from C#, you can configure webview in MainActivity. @RomainGuy But you also must calculate the distance between the two points to determine a click. EditText editText = new EditText(this); editText. Aug 12, 2019 · Xamarin Android: How to show checkbox when i long click a row in the recyclerview (row, OnClick, OnLongClick); return vh; } public override void OnBindViewHolder Mar 21, 2016 · You can implement an OnClickListener via OnTouchListener: webView. In XML onClick attribute will call activity's public method. Android, the way to set up a listener for a Click event is by adding a EventHandler, in the following ways: 1. However, define the appropriate task options in the manifest. Then it will work because 1st priority will go for always onClick method what you mentioned in xml. android:onClick="onFragmentViewClick". First of all, lets have a look at the difference in code: XML Attribute / onClick attribute. In the provider add a constant that matches the action name: public static String WIDGET_BUTTON = "MY_PACKAGE_NAME. I have added a Popup menu to my application but I don't know how to refer to the items in the menu (the buttons) in order to handle onClick events. Toolbar toolbar = FindViewById<Android. ListView lv = (ListView)sender; // this assumes your List is bound to a List<Club>. public void onFragmentViewClick(View v) {. private readonly IList<ListMenuItem> items; public MainMenuRecyclerAdapter(IList<ListMenuItem> data) Apr 13, 2018 · 1. Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2. Androidで少し名前違うので) Android Jul 28, 2016 · C# Xamarin OnClick function. SetWebViewClient Jul 14, 2018 · クリックされたらToast表示するだけのイベント関数. Id. // set the other buttons back to the base color. He creates a common content page with custom action for back button: In Android Java, the way to set up a listener for a Click is using a onClickListener for the view that will be clicked, like this: public void onClick(View v) {. @Override. Give it a name, like XamarinRecyclerView. Aug 5, 2019 · MyView view = new MyView (row) { mName = txtName, mSubject = txtSubject, mMessage = txtMessage }; you have customized RecyclerViewHolder ，you could use it directly. Than, in code behind of the same file, create TapGestureRecognizer & add to that Image. SetOnClickListener += Something; Jan 15, 2018 · I tried creating a custom renderer (Android) for the child relative layout and set it and it's children (the buttons) to (Android. Dec 28, 2009 at 4:29. To make click event work add android:onClick attribute to the Button element in your XML layout. Applies to Nov 11, 2010 · 6. setOnTouchListener(new OnTouchListener() {. GreetingBtn_Click); void GreetingBtn_Click(Object sender, Aug 12, 2016 · For android you can find a sample on this page. Here is the Link of Jun 3, 2017 · var vh = new PdfAdapterViewHolder(itemView, OnClick, OnLongClick); return vh; // Replace the contents of a view (invoked by the layout manager) public override void OnBindViewHolder(RecyclerView. app. The project needs to be clicked after opening all the types of projects in Visual Studio or click ( Ctrl+Shift+N ). Follow edited May 23, 2017 at 11:44. Nothing really happens at all. I’m trying to make a RecyclerView with CardViews. Thanks Mar 11, 2018 · 9. Export assembly to your project. Clickable = true. How can I achieve this onclick action for each image in recycler view. Androidのサンプルを ググる と、以下のような ラムダ式 で書くサンプルをよく見かける。. Jun 29, 2014 · Here is a better and less tightly coupled way to implement an OnClickListener for a RecyclerView. //You may have to change the Name depending on how you name that handler in xaml. Take a look on this blog post: Let’s Override Navigation Bar back button click in Xamarin For. cs. This includes changing the focus as Views are removed or hidden, or as new Views become available. udemy. BackgroundImage = "background. View; import android. makeText(this, "Position is: "+position, Toast. import android. IOnClickListener. 31 1 1 silver badge 4 4 bronze badges. Lets say you have a drawable on left side of your EditText 'txtsearch'. add a clicked handler. v7. Jan 18, 2017 · in addition to the options shown in your question, there is the possibility of implementing the action directly in your xml file from the menu, for example: May 15, 2017 · I am writing code for click event for logout like this. ※ViewのクリックをハンドリングすることをClickリスナーと表現しておきます。. 6+, So, you can just do: // kotlin import androidx. Recyclerview Item Click not working. png", Content = new StackLayout. Also a base adapter class to show a list of record. The app runs fine but if I scroll in the RecyclerView when I press the button once it clicks/runs the code multiple times. SOLUTION: In Fragment's layout add this to the View. <Button Clicked="ButtonClicked" />. {. Learn more from the answers and examples on Stack Overflow. It is a good practice to use the xml attribute “onClick” over an anonymous Java class whenever possible. PushAsync(new DetailedClub(club. Feb 10, 2013 · 49. May 10, 2024 · When the user clicks a button, the Button object receives an on-click event. I tried adding a click event function in the fragment. CenterAndExpand, Spacing = 50, Children = {. AppCompatActivity; Nov 26, 2018 · The reason your click event might not be working is that after onConfigurationChanged is called on configuration change you are not reassigning the values to your objects. Builder(this) . 1 1 1 Xamarin Forms Button OnClick. 5 Attribution License. You can't add the launch of an Intent inside the onclick parameter in XML. StartActivity(typeof(LoginActivity)); LoginActivity. requestFocus(); If already we declared the component in the xml view then we have to find it and we can the focus as given below. Well I had certain issues with LinkMovement for example the click is triggered on MotionEvent. I started to work with Xamarin Studio a weeks ago, and could not find solution to the next problem: created an edittext which will contains serial numbers. 一方、 Android Studio の人たちのサンプルはほぼレイアウトでイベント設定をしている。. Sep 8, 2018 · Androidアプリ作ってる人にView. VerticalOptions = LayoutOptions. As per your xml you should remove android:onClick="onClick" line from your Image button Xml. SelectedItem; // assuiming Club has an Id property. I've googled for this and can't find any appropriate solution. Jul 14, 2019 · I want to make onClick() in my layout xml trigger two methods from two viewmodels. if you use MyView , in the class,no click events are defined. If what you want is when a tab is clicked and not each time a tab is selected, you can use custom view for each tab and then handle click on respective view like this: for (int i = 0; i < tabLayout. I didn't have any issue when I created the list in Android Jun 23, 2017 · 2. Androidでレイアウトにイベントを書く. Another way to set your on click listeners would be to use XML. using System; at the top of your file in order to use EventArgs. final TabLayout. Clicked += DelayedButton_Clicked; } async private void DelayedButton_Clicked(object sender, EventArgs e) { this. getTabCount(); i++) {. public RecyclerAdapter mAdapter; 2. Snippet of usage: RecyclerView recyclerView = findViewById(R. Create new a project as "File" -> "New" -> "Android Application Project" as shown below: Step 2. Here is a brief documentation from this link. All you have to do is record the x & y position of the last ACTION_UP or ACTION_MOVE event and use these values in your OnClickListener. Tab tab = tabLayout. Below is the code: MainActivity. addCallback onBackPressedDispatcher. Apr 13, 2011 · 4. I followed the pattern from a tutorial on the xamarin documentation available here. setOnClickListener(new OnClickListener() {. This includes the above Foo class, resulting in the Android Callable Wrapper: package scratch. any help will be appreciated. BindingContext = this Mar 21, 2022 · 1. Lang. When referenced by a Button for its background, the image displayed changes based on the button's state. view. MainPage = new ContentPage. View class. forms PCL having android and IOS project I create one usercontrol (two label in stacklayout) I want to create click event for usercontrol. Inflate(Resource. Jun 16, 2016 · 2. cs in my project, using Xamarin Forms as work environment, and I was just wondering if I could be able to add an OnClick for the button that is at the end of the code. id. I added a fragment and within the fragment I added a button. xml file in the > <receiver><intent-filter> tag: <action android:name="MY_PACKAGE_NAME. NET MAUI build process on Android. The value for this attribute must be the name of the method you want to call in response to a click event. // you will need to assign each button an x:Name in xaml. Button1. Fragment reusability. OnClickListener; import android. Feb 3, 2015 · Toast. Forms file and also in the custom renderer Jan 5, 2017 · I am using xamarin. I am new in xamarin. setAdapter(mAdapter); And then here you replace your Layout. View. AddJavascriptInterface(new MyJSInterface(this), "CSharp"); webview1. Step 1. I used recycler view for displaying the images in each row. 昔ながらのUI編集画面で Nov 29, 2013 · In visual studio it can easily be done by going event handler of button and set the method in onclick event how to do it in xamarin. Native project and not a Xamarin. IsEnabled = false; await Task. WIDGET_BUTTON"; Dec 29, 2010 · To simulate BACK button press you can just call onBackPressed() from your activity code (added in API8) – Alex Semeniuk. Just create a global variable named 'position' and initialize it with getAdapterPosition () in any of the major method of the adapter (class or similar). protected override void OnCreate (Bundle bundle) {. Setting setOnClickListener(null) is a good idea to remove click listener at runtime. await Navigation. addCallback(this /* lifecycle owner */, object : OnBackPressedCallback(true) { override fun handleOnBackPressed() { // Back is pressed . Bundle; import android. Export] requires you to add the Mono. Builder builder = new AlertDialog. You must add the radio buttons to a RadioGroup and then the RadioGroup to the layout. Jun 16, 2020 · In Xamarin Android (NOT Xamarin. android:clickable="true". button1); button. Menu. BackgroundColor = Color. So, remove the 'If' statement, you don't need it! Your method 'ChangeColorToRed' will be called only when user clicks on that button. txtsearch); txtsearch. getTabAt(i); Mar 28, 2022 · Here is my modal in xamarin: public AboutPage() { InitializeComponent(); AddProductCommand = new Command&lt;Product&gt;(AddProduct); this. OnConfigurationChanged(newConfig); Hello I have a List View that I made in Xamarin forms and all I want it to do is when the user clicks a option in the List View it take them to another Xamarin forms page in my case it would be ContactInfo . IOnMenuItemClickListener interface by overriding the following method: Feb 22, 2024 · Because a special activity that starts from a notification doesn't need a back stack, you can create the PendingIntent by calling getActivity () . Intent i = new Intent(this, ActivityStore. android:background="@drawable/search" />. However, in Xamarin. This can be useful for web, email, phone, or map links. Adapter. V7. CenterAndExpand, HorizontalOptions = LayoutOptions. cs code but I got an exception "System. First of all, in References, add a reference of Android. Step 2 - Add Android Support v7 AppCompat Library. May 20, 2024 · Attach AfterTextChanged on EditText in Holder and attach OnClick method to buttons; Process: user clicks "add 1" -> onClick method triggers -> I get parent of button and get Holder object -> I change value of EditText in that holder object -> AfterTextChanged gets triggered and updates child item in list Dec 22, 2015 · The Most simple way to open activity on button click is: Create two activities under the res folder, add a button to the first activity and give a name to onclick function. IllegalStateException: Could not find method onClick(View) in a parent or ancestor Context for android:onClick attribute defined on view class android. IE, Then in your code behind file, // Assuming your list ItemsSource is a list of strings. WIDGET_BUTTON" />. Delay(Delay); this. 2 release notes within the section titled "Exporting arbitrary Java member for better Java integration". In MainActivity. The Activity hosting the layout must then implement the Jan 7, 2018 · Xamarin Button Clicked EventHandler. textViewLogout); logout. Each CardView has multiple (4) buttons. so just trying to make basic application. png" x:Name="imageFinance" HorizontalOptions ="CenterAndExpand "/>. Object subclass, which declares all overridden methods and all implemented Java interfaces. If we create an EditText dynamically then we have to set the requestFocus () as given below. However, in order to implement IOnClickListener (or any other interface that's also an IJavaObject) you need to make the class implementing it inherit from Java. Select Android and from the list, choose Android Blank App. textviewy; import android. Click += new EventHandler(this. setOnClickListener(android. setOnClickListenerを使ったことがない人はいないかと思います。. below is following code: . android and i'm using the navigation drawer app. Xamarin. for each record i display a button This is what i display Header 1 … Mar 27, 2014 · You just use this custom adapter in your Listview creation and then you will write your code in this block use this code in your activity CustomAdapter mAdapter = new CustomAdapter(this, R. when click from application code is not executed. replace. public static RecyclerView. axml) Jun 17, 2015 · I am working on xamarin android apps. Oct 30, 2018 · Here is the Complete Xamarin Developer Course: iOS And Android: https://www. Android. public class ElegantNumberButton : RelativeLayout { private Context Nov 5, 2020 · Create a new class which inherits from Xamarin. Click File--> select New--> select Project. Support. It Jul 13, 2016 · You don't have CommandParameter bound to anything. Also in MainActivity. Firstly that you are working with a Xamarin. e. 3. Code for changing background color to red of your button looks like this: protected override void OnCreate(Bundle savedInstanceState) {. dy xp sh fz ov rt lk dt bh ig