How to dismiss AlertDialog in android

Actually there is no any cancel() or dismiss() method from AlertDialog.Builder Class.

So Instead of AlertDialog.Builder optionDialog use AlertDialog instance.

Like,

AlertDialog optionDialog = new AlertDialog.Builder(this).create();

Now, Just call optionDialog.dismiss();

background.setOnClickListener(new OnClickListener() {    public void onClick(View v) {        SetBackground();        // here I want to dismiss it after SetBackground() method         optionDialog.dismiss();    }});

I think there's a simpler solution: Just use the DialogInterface argument that is passed to the onClick method.

AlertDialog.Builder db = new AlertDialog.Builder(context);        db.setNegativeButton("cancel", new DialogInterface.OnClickListener(){            @Override            public void onClick(DialogInterface d, int arg1) {                db.cancel();                //here db.cancel will dismiss the builder            };          });

See, for example, http://www.mkyong.com/android/android-alert-dialog-example.

Try this:

   AlertDialog.Builder builder = new AlertDialog.Builder(this);   AlertDialog OptionDialog = builder.create();  background.setOnClickListener(new OnClickListener() {        public void onClick(View v) {            SetBackground();       OptionDialog .dismiss();        }    });