CheckBoxPreference - onSharedPreferenceChanged方法未被调用

Question

我设置了几个CheckBoxPreferences，我的偏好类扩展了PreferenceActivity并实现了OnSharedPreferenceChangeListener这是我用来回应人们检查/取消检查CheckBoxPreferences的:

public void onSharedPreferenceChanged(SharedPreferences P, String K) {
    if (K.equals(CheckBoxPref_KEY_HERE)) {
        MyClass.BooleanVariable = P.getBoolean("CheckBoxPref_KEY_HERE", true);
    }
}

据我所知，上面的onSharedPreferenceChanged方法甚至从未被调用?

Answer 1

如果你想对所有的首选项做点什么，这里是soln:

创建类成员:

SharedPreferences settings;

onCreate方法中的

settings = getSharedPreferences(<your_pref_name>, 0);
settings.registerOnSharedPreferenceChangeListener(new SharedPreferences.OnSharedPreferenceChangeListener() {
  @Override
  public void onSharedPreferenceChanged (SharedPreferences sharedPreferences, String key) {
    // Do whatever
  }
});

Answer 2

checkBoxPreference = (CheckBoxPreference) this.findPreference("CheckBoxPref_KEY_HERE");
checkBoxPreference.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
            // do your work here
            return true;
        }
    });