Try this

((CheckBox)view).setOnCheckedChangeListener(new OnCheckedChangeListener() {

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean checked) {
        switch (view.getId())
        {
        case R.id.checkBox\_uppercase:
            if(checked)
                editText2.setEnabled(true);
            else
                editText2.setEnabled(false);
            break;

        case R.id.checkBox\_lowercase:
            if(checked)
                editText3.setEnabled(true);
            else
                editText3.setEnabled(false);
            break;

        case R.id.checkBox\_numbers:
            if(checked)
                editText4.setEnabled(true);
            else
                editText4.setEnabled(false);
            break;

        case R.id.checkBox\_symbols:
            if(checked)
                editText5.setEnabled(true);
            else
                editText5.setEnabled(false);
            break;
        }
    }
});

Late but hope this helps!