类型中的方法调用（活动） <type> 不适用于参数（新的View.OnClickListener（）{}）

Question

Groping in the dark... This time I am receiving the following error in Eclipse:

The method call(Activity) in the type IntentsUtils is not applicable for the arguments (new View.OnClickListener(){})

This error refers to the call() line in a callback hooked up to a button, in a class that extends Activity:

public class UnderstandingIntents extends Activity {
    ...
    ...
    ...
    // A call-back for when the user presses the testintents button.
    OnClickListener mTestIntentsListener = new OnClickListener() {
        public void onClick(View v) {
        IntentsUtils.call(this);
        }
    };
}

IntentsUtils is a class copied verbatim from listing 3-33 here .

What does this error mean?

Answer 1

The problem here is that you are trying to reference the Activity Class (UnderstandingIntents) in an Anonymous inner class, hence when you say "this" it refers to View.OnClickListener(){}

to correct this do the following code:

IntentsUtils.call(UnderstandingIntents.this); 

This way, your Activity class gets referenced.

Answer 2

The this parameter passed into IntentsUtils.call() refers to the object within which it is being used, in this case an instance of OnClickListener . Try replacing the this parameter with UnderstandingIntents.this :

IntentsUtils.call(UnderstandingIntents.this);

Answer 3

尝试这个

IntentsUtils.call(UnderstandingIntents.this);