Android :: Boolean Preference - Saving Status Of Checkbox

I want to have the status of a checkbox be saved into my prefs. I set a listener on the checkbox, and if it is checked I do a prefs.putBoolean("cbstatus", true), and it is it unchecked i do a prefs.putBoolean("cbstatus", false); Trouble is, in my onStart() when I get prefs, my Boolean getcbstatus = prefs.getBoolean("cbstatus", false); will always return a true, regardless of how my listener should have set that status previously.

What am I doing wrong? I have working prefs for other things like spinners, textviews, and edit texts, but what should be the simplest type (a boolean) is giving me a hard time. I've even tried taking out all code related to listeners and pref setting for this checkbox, so that the only code in the entire activity that deals with the checkbox is in the line

Boolean getcbstat = prefs.getBoolean("cbon", false);
if (getcbstat = true) { cb1.setChecked(true);
} else { cb1.setChecked(false);
format.setVisibility(View.VISIBLE);
}

Since there is no cbon preference (i deleted them all), it should return false by default and the box should be unchecked since. cb1, of course, is the name of my checkbox. Update on the code:

OnClickListener cb = new OnClickListener() {
public void onClick(View v) { if (cb1.isChecked()) {
prefs.putBoolean("cbon", true);
} else { prefs.putBoolean("cbon", false);
} } };
And in the onStart():
Boolean getcbstat = prefs.getBoolean("cbon", false);
cb1.setChecked(getcbstat);