CODEWITHSUNDEEP
androidsharedpreferences
shanmugamgsn
shanmugamgsn

Reputation: 840

Get value from CheckBoxPreference when it is changed

I'm trying to create Preference Screen with a Checkbox control.

 <CheckBoxPreference android:summaryOn="@string/mySummaryOn" 
  android:summaryOff="@string/mySummaryOff" 
  android:key="myCB" 
  android:title="my checkbox"/>

I want to get this Boolean value when ever its getting changed.

In my Application i have done as below implementing OnSharedPreferenceChangeListener

public boolean cbValue;
 @Override
    public void onCreate() {
        // The following line triggers the initialization of ACRA
        ACRA.init(this);
        prefs=PreferenceManager.getDefaultSharedPreferences(this);
        prefs.registerOnSharedPreferenceChangeListener(this);
        super.onCreate();
    }

public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
        String key) {
    // TODO Auto-generated method stub
    //FacebookStatus=prefs.getBoolean("myCB", true);
    Toast.makeText(getBaseContext(), "Shared Preference Changes ",Toast.LENGTH_LONG ).show();
}

onSharedPreferenceChanged method is not at all called even when i toggle check box in pref screen.

If i need to get value from Shared preference each time when value is changed wat should i do?

Upvotes: 2

Views: 6790

Answers (3)

Hyunro19
Hyunro19

Reputation: 11

SwitchPreference switchPref = (SwitchPreference)findPreference("switchPref");
switchPref.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        boolean beforeChange = ((SwitchPreference) preference).isChecked();
        boolean afterChange = !beforeChange;
        ((SwitchPreference) preference).setChecked(afterChange);
        // Toast.makeText(getContext(), ""+afterChange, Toast.LENGTH_SHORT).show();
        return false;
    }
});

If you override onPreferenceChange(), the checked status doesn't change when you clicked the switch.

Don't forget to add switchPref.setChecked(!isChecked()).

Upvotes: 1

Kap&#233;
Kap&#233;

Reputation: 4781

You can read the new value directly with the SharedPreferences parameter object. If you know that the key is from the CheckBoxPreference you can just read the value:

@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {

    if (key == getString(R.string.CheckBoxKeyId)) {
        boolean myBool = sharedPreferences.getBoolean(key, false);
        // do stuff
    }
}

This saves you adding an OnPreferenceChangeListener for each of the CheckBoxPreference you might have.

Upvotes: 0

Antek
Antek

Reputation: 423

Instead of using OnSharedPreferenceChangeListener:

Add to your preference activity's onCreate method following line: Preference myCheckbox = findPreference("myCB") Then apply a listener to myCheckbox object: myCheckbox.setOnPreferenceChangeListener(myCheckboxListener)

Code of the listener (as a class field):

private OnPreferenceChangeListener myCheckboxListener = new OnPreferenceChangeListener() {

    public boolean onPreferenceChange(Preference preference, Object newValue) {
        // Read new value from Object newValue here
        return true;
    }
};

Upvotes: 2

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