[android] How to simulate a button click using code?

How can I trigger a button click event using code in Android? I want to trigger the button click programmatically when some other event occurs.

Same Problem I am Facing

public void onDateSelectedButtonClick(View v){
    /*Something  Alarm Management 
    http://www.java2s.com/Code/Android/Core-Class/Alarmdemo.htm
    copied code from this site*/
}

Button code:

<Button
    android:onClick="onDateSelectedButtonClick"
    android:text="Set notification for this date" />

But I want to call that function OnLoadLayout without OnClickEvent

If you do not use the sender argument, why not refactor the button handler implementation to separate function, and call it from wherever you want (from the button handler and from the other place).

Anyway, it is a better and cleaner design - a code that needs to be called on button handler AND from some other places deserves to be refactored to own function. Plus it will help you separate UI handling from application logic code. You will also have a nice name to the function, not just onDateSelectedButtonClick().

Starting with API15, you can use also callOnClick() that directly call attached view OnClickListener. Unlike performClick(), this only calls the listener, and does not do any associated clicking actions like reporting an accessibility event.

you can do it this way

private Button btn;
btn = (Button)findViewById(R.id.button2);
btn.performClick();

Android's callOnClick() (added in API 15) can sometimes be a better choice in my experience than performClick(). If a user has selection sounds enabled, then performClick() could cause the user to hear two continuous selection sounds that are somewhat layered on top of each other which can be jarring. (One selection sound for the user's first button click, and then another for the other button's OnClickListener that you're calling via code.)

Just write this simple line of code :-

button.performClick();

where button is the reference variable of Button class and defined as follows:-

private Button buttonToday ;
buttonToday = (Button) findViewById(R.id.buttonToday);

That's it.

Just to clarify what moonlightcheese stated: To trigger a button click event through code in Android provide the following:

buttonName.performClick();