Difference between OnClick() event and OnClickList

Question

I'm always using onclick() event in most of my projects. But, I read about OnClickListener(). Can anyone tell what's the difference between these two? And which one is best to use in Android application?.

Answer 1

There are a couple reasons why you might want to programmatically set an OnClickListener. The first is if you ever want to change the behavior of your button while your app is running. You can point your button at another method entirely, or just disable the button by setting an OnClickListener that doesn't do anything.

When you define a listener using the onClick attribute, the view looks for a method with that name only in its host activity. Programmatically setting an OnClickListener allows you to control a button's behavior from somewhere other than its host activity. This will become very relevant when we talk about Fragments, which are basically mini activities, allowing you to build reusable collections of views with their own lifecycle, which can then be assembled into activities. Fragments always need to use OnClickListeners to control their buttons, since they're not Activities, and won't be searched for listeners defined in onClick.

Answer 2

We use OnClick in xml and OnClickListner in java code . Both are use to perform a function.

Answer 3

Consider "OnClickListener" as a guy who is waiting your user to click the button of your app. Then your guy will execute your method OnClick().

You have to put an id to your button in your xml file, then give it a name in your MainActivity.java file. Then set a click listener to your guy. And add your onClick method. That's why onClick is bound to the interface View.OnClickListener : https://developer.android.com/reference/android/view/View.OnClickListener.html

Example :

Button myButton = (Button)findViewById(R.id.myButton);
myButton.setOnClickListener(new View.OnClickListener(){
    @override
    public void onClick(View v) {
        // your method...
    }
}