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DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        switch (which) {
            case DialogInterface.BUTTON_POSITIVE:
                mRootRef.child(tasksList.get(position).getTaskID()).removeValue();
                break;

            case DialogInterface.BUTTON_NEGATIVE:
                break;
        }
    }
};

AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage("Do you want to delete this Task?")
    .setPositiveButton("Yes", dialogClickListener)
    .setNegativeButton("No", dialogClickListener).show();

return true;