CODEWITHSUNDEEP
javaandroidlisteneronclicklistener
user2281682
user2281682

Reputation: 77

Invoke a listener call programmatically in Android

I'm playing with Android and I'd like to know if there's any way to invoke a listener call programmatically, for example, having an onClick() listener and invoke a call to this listener without touching the screen when the activity is created.

Upvotes: 5

Views: 8060

Answers (3)

rekire
rekire

Reputation: 47945

There is no way to get the set OnClickListener. So you need to store it and call your OnClickListener directly.

OnClickListener store = new OnClickListener() {/*...*/};
view.setOnClickListener(store);
store.onClick(view);

Upvotes: 6

Alexis C.
Alexis C.

Reputation: 93842

Never tried that, but after assigning a clickListener to your object (for example a Button), call on your onCreate method myButton.performClick().

Android doc : 

public boolean performClick ()

Added in API level 1
Call this view's OnClickListener, if it is defined. Performs 
all normal actions associated with clicking: reporting accessibility event, 
playing a sound, etc.

Returns
True there was an assigned OnClickListener that was called, 
false otherwise is returned.

Upvotes: 6

David
David

Reputation: 20063

Although this is possible, I'd actually advise against it. Listeners should be called from the UI but the business logic behind it is what should actually be called directly. This would provide "separation of concern" between both layers.

You should be calling the code that the listener calls in it's onClick method rather than invoking the onClick directly.

Upvotes: 0

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