Question

It’s easy to disable a button when I use listeners like this:

button.setOnClickListener(btnSub);
button.setEnabled(false);

But when I use the onClick for the button in the XML file and just call a method in the main file, is it possible to reach that button an disable it?

Answer 1

If you are using the xml layout to set the on-click function of your button, then you use something like this, right?:

<Button
    ...
    android:onClick="yourFunction"
    ... />

If you take a look at the documentation, it says, that you need to supply a function for this, what takes a View parameter.

So you need to implement yourFunction this way:

public void yourFunction(View view){...}

The View, what you get in that function, is the Button (or any other View) what you clicked.

So you just need to implement that function like this:

public void yourFunction(View view)
{
    view.setEnabled(false);
}

---

EDIT
If you give that Button an id with the following xml attribute:

android:id="@+id/my_button"

Then you can access that View (Button) from your Activity (or Dialog):

Button myButton = (Button) findViewById(R.id.my_id);

and enable it:

myButton.setEnabled(true);