Question

I’m trying to create an app for Android, and I follow this tutorial http://developer.android.com/training/basics/firstapp/starting-activity.html

there is a part

/** Called when the user clicks the Send button */
public void sendMessage(View view) {
    // Do something in response to button
}

then I followed this tutorial and everything worked, untill I remove parameter View view

my question is just why everytime I remove it, so the function just be:

/** Called when the user clicks the Send button */
public void sendMessage() {
    // Do something in response to button
}

and I run the app, it forced close.

could anyone enlighten me? thank you

Answer 1

the method (typically called onClick(View view)) method takes a parameter (the View it is associated with). see http://developer.android.com/reference/android/view/View.OnClickListener.html for more information on the function. if you leave off the parameter you wouldn’t expect it to work, would you?