Xamarin.Android Bindings Implementing Java interfaces
Example
If a java library contains interfaces that should be implemented by the user (e.g. click listeners like View.IOnClickListener or callbacks), the implementing class has to inherit -- directly or indirectly -- from Java.Lang.Object or Java.Lang.Throwable. This is a common error, because the packaging steps just print a warning that is overlooked easily:
Type 'MyListener ' implements Android.Runtime.IJavaObject but does not inherit from Java.Lang.Object. It is not supported.
Wrong
The usage of this implementation will result in unexpected behavior.
class MyListener : View.IOnClickListener
{
public IntPtr Handle { get; }
public void Dispose()
{
}
public void OnClick(View v)
{
// ...
}
}
Correct
class MyListener :
Java.Lang.Object, // this is the important part
View.IOnClickListener
{
public void OnClick(View v)
{
// ...
}
}
