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Attempt to invoke virtual method void android widget button setonclicklistener on a null object reference – Android

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This error usually occurs when you are trying to set an OnClickListener on a Button object, but the Button object is null. This can happen if you have not properly initialized the Button object or if you have not correctly linked it to the corresponding Button view in your layout file.

To fix this error, make sure that you have properly initialized the Button object and that it is not null. You can do this by using the findViewById() method to get a reference to the Button view in your layout file and then casting it to a Button object.

For example:

Button button = (Button) findViewById(R.id.button_id);

Once you have a reference to the Button object, you can then set an OnClickListener on it by calling the setOnClickListener() method.

It’s also possible that this error can occur if you have a typo in the id of the Button view in your layout file. Make sure that you have spelled the id correctly and that it matches the id that you are using in your code to get a reference to the Button object.