show alert dialog through button android

Question

I'm trying to show an alert dialog when the user click a button

    Previous.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {
            AlertDialog.Builder answerAlert = new AlertDialog.Builder(this);
        }
    });

but I got an error in this line

            AlertDialog.Builder answerAlert = new AlertDialog.Builder(this);

which said

 The constructor AlertDialog.Builder(new View.OnClickListener(){}) is undefined

anyone know how to fix it? thanks

Answer 1

AlertDialog gets Context in the Constructor but you used this inside your onClickListenner. Instead you should write YourActivity.this

 Previous.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View view) {
        AlertDialog.Builder answerAlert = new AlertDialog.Builder(YourActivity.this);
    }
 });

Answer 2

this is your anonymous OnClickListener inner class. Use MyActivity.this instead (replace MyActivity with the name of the activity).

Answer 3

You have to pass an object of Context to the AlertDialog.Builder constructor and View.OnClickListener does not extend Context

Change

AlertDialog.Builder answerAlert = new AlertDialog.Builder(this);

to

AlertDialog.Builder answerAlert = new AlertDialog.Builder(YourActivity.this);

as Activity extends Context

Answer 4

In your code this is your View.OnClickListener interface implementation.

Try this :

AlertDialog.Builder answerAlert = new AlertDialog.Builder(YourActivity.this);

Where YourActivity is your Activity's name