Dependency "XXXX" not found for preference "XXXX"

在使用settings的时候，如果通过代码的形式添加CheckboxPreference，使用setDependency()方法的注意事项：

private static final String PARENT_CHECKBOX_PREFERENCE = "parent_checkbox_preference";
 
    @Override 
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        PreferenceScreen root = getPreferenceManager().createPreferenceScreen(this);
        setPreferenceScreen(root); // 这里必须先添加
        populatePreferenceHierarchy(root);  // 然后再在root树上构建preference，代码执行顺序不能颠倒
 
private void populatePreferenceHierarchy(PreferenceScreen pScreenRoot) {
        // Preference attributes 
        PreferenceCategory prefAttrsCat = new PreferenceCategory(this);
        prefAttrsCat.setTitle("preference_attributes");
        pScreenRoot.addPreference(prefAttrsCat);
 
        // Visual parent toggle preference 
        CheckBoxPreference parentCheckBoxPref = new CheckBoxPreference(this);
        parentCheckBoxPref.setKey(PARENT_CHECKBOX_PREFERENCE);
        parentCheckBoxPref.setTitle("title_parent_preference");
        parentCheckBoxPref.setSummary("summary_parent_preference");
        prefAttrsCat.addPreference(parentCheckBoxPref);
 
 
        // Visual child toggle preference 
        // See res/values/attrs.xml for the <declare-styleable> that defines TogglePrefAttrs. 
        TypedArray typeA = obtainStyledAttributes(R.styleable.TogglePrefAttrs);
        CheckBoxPreference childCheckBoxPref = new CheckBoxPreference(this);
        childCheckBoxPref.setKey("child_checkbox_preference");
        childCheckBoxPref.setTitle("title_child_preference");
        childCheckBoxPref.setSummary("summary_child_preference");
        childCheckBoxPref.setLayoutResource(typeA.getResourceId(R.styleable.TogglePrefAttrs_android_preferenceLayoutChild, 0));
        prefAttrsCat.addPreference(childCheckBoxPref); // 这里必须先添加
        childCheckBoxPref.setDependency(PARENT_CHECKBOX_PREFERENCE); // 然后再设置依赖
 
        typeA.recycle();
}