Question

I am trying to use sharedpreferences in a PreferenceActivity, but unfortunately it force closes. Part of it:

public class EditPreferences extends PreferenceActivity {

String ListPreference;
boolean CheckboxPreference;
SharedPreferences mprefs;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    addPreferencesFromResource(R.xml.preferences);


final CheckBoxPreference checkboxPref = (CheckBoxPreference) getPreferenceManager().findPreference("checkboxPref");

checkboxPref.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {            
public boolean onPreferenceChange(Preference preference, Object newValue) {
    if (newValue.toString().equals("true"))
    {  
        Toast.makeText(getApplicationContext(), "CB: " + "true", Toast.LENGTH_SHORT).show();
        SharedPreferences.Editor edit = mprefs.edit();
        edit.putString("cbstate", "true");
        edit.commit();
    } 
    else 
    {  
        Toast.makeText(getApplicationContext(), "CB: " + "false", Toast.LENGTH_SHORT).show();
    SharedPreferences.Editor edit = mprefs.edit(); //this line force closes
        edit.putString("cbstate", "false");
        edit.commit();
    }
    return true;
}

});

What is wrong with the code?
Thanks,
B

Answer 1

It doesn’t look like mprefs is ever assigned a value (unless it’s happening somewhere else)