Question

http://developer.android.com/reference/android/view/View.html#attr_android:onClick

Here it is said that

For instance, if you specify android:onClick=”sayHello”, you must declare a public void sayHello(View v) method of your context (typically, your Activity).

I’m intrested in “typically, your Activity”… And what if not typically? I’m creating a widget app so I don’t have an activity at all…

Almost forgot..
And the question is: where should I write that sayHello method?

Answer 1

Here’s the code which is responsible for the invacation:

try {
    mHandler = getContext().getClass().getMethod(handlerName, View.class);
} catch (NoSuchMethodException e) {
    throw new IllegalStateException("Could not find a method " +
        handlerName + "(View) in the activity", e);
}

So basiclly it searches in the class which implements the context for the given method. Usually the context is an activity.