(View) in a parent or ancestor Context for android:onClick attribute defined on view class Button

Vimalsoft Pty Ltd

Good Day Everyone I have an activity class defined like this

[Activity(Label = "Activity_Home", MainLauncher = false, Icon = "@drawable/lenderlogo", Theme = "@style/MyTheme")]
public class Activity_Home : ActionBarActivity //AppCompatActivity
{

and the activity is hosting a Tab that display its content from a fragment. A fragment is defined separately and it has a button that is defined like this

as you can see i have a click event that is triggered when the button is clicked. The code to handle the event of the button is defined in the fragment class file like this

//Find Controls to hook
Button btn_details_save = FindViewById(Resource.Id.btn_details_save);

            // set onclick listener here, by deleting some process
            btn\_details\_save.Click += delegate
            {
                btn\_details\_saveClick();
            };

and he function itself is defined like this

public void btn_details_saveClick()
{
//Do stuff
}

Now when i run the application, the button is click the button the following error occurs AndroidRuntime(19059): java.lang.IllegalStateException: Could not find method btn_details_saveClick(View) in a parent or ancestor Context for android:onClick attribute defined on view class Button with id 'btn_details_save' Please note that this is C# code , which means i am using xamarin ,but the error is Android related not Xamarin. Thanks

Vuyiswa Maseko, Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code. C#/VB.NET/ASP.NET/SQL7/2000/2005/2008 http://www.vimalsoft.com vuyiswa[at]vimalsoft.com

David Crow

My first concern is that you are declaring the click handler twice: once in the layout file, and again in code. Use one or the other, but not both. Second, you need to change btn_details_saveClick() to accept a View parameter. This is what the error message is actually telling you.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

Vimalsoft Pty Ltd

Thanks for your reply David "My first concern is that you are declaring the click handler twice: once in the layout file, and again in code. Use one or the other, but not both." I thought we have to add the click event on the layout file and add hookup the event to the button also in the initialization of the Activity. i learned, thanks. i am coming from asp.net background i have changed my function in my frament page to be like this

public void btn_details_saveClick(View view)
{

had //// set onclick listener here, by deleting some process //btn_details_save.Click += delegate //{ // btn_details_saveClick(); //}; and i ran it and i got the Error java.lang.IllegalStateException: Could not find a method btn_details_saveClick(View) in the activity class android.support.v7.widget.TintContextWrapper for onClick handler on view class android.support.v7.widget.AppCompatButton with id 'btn_details_save' i have also have a example project( 9mb) on this link Example Project To Reproduce the Error 1) Open the drawer 2) Click on loan application and click the button "Continue" and you will get an Error Thanks

Vuyiswa Maseko, Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code. C#/VB.NET/ASP.NET/SQL7/2000/2005/2008 http://www.vimalsoft.com vuyiswa[at]vimalsoft.com

David Crow

Does the btn_details_saveClick() method belong to the same class that 'owns' the layout?

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

Vimalsoft Pty Ltd

Hi David Yes it does , i have an example Project (9mb) http://www.3cx.vimalsoft.com/Example\_Android\_Exception/App10.zip

Vuyiswa Maseko, Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code. C#/VB.NET/ASP.NET/SQL7/2000/2005/2008 http://www.vimalsoft.com vuyiswa[at]vimalsoft.com

David Crow

If you are defining the click-handler in the .xml file, the click-handler must be implemented in the activity not the fragment. If you are defining the click-handler in the .cs file, the click-handler can be implemented in the fragment. You'll notice in that example that the btn_details_saveClick() method is contained within the activity PersonalDetailsView rather than the fragment PageFragment.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

Vimalsoft Pty Ltd

Thank you David i fixed the issue after making the PersonalDetailsView inherit from Fragment, all started to work.

Vuyiswa Maseko, Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code. C#/VB.NET/ASP.NET/SQL7/2000/2005/2008 http://www.vimalsoft.com vuyiswa[at]vimalsoft.com