Save CheckBox state in app

I have checkbox in my android app. My checkbox is checked when app's first run. What if user disable checkbox? I don't want to save preferences in my app.

Every time isChecked is true for my arrangement. After user change checkbox How can I save the state of the checkbox?

xml:

<CheckBox
    android:id="@+id/remember_me"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="#FF297AA6"
    android:checked="true"
    android:textColor="@android:color/white" />

Here my activity code - Always isChecked true from my xml;

if (mCheckBox.isChecked()) {
    remembername = preferences.getString("user", "");
    rememberpassword = preferences.getString("pasword", "");
    user.setText(remembername);
    parola.setText(rememberpassword);
}