相关疑难解决方法(0)

如上所述这里,我继承PreferenceFragment并显示它的活动中.该文档解释了如何在此处监听首选项更改,但前提是您将PreferenceActivity子类化.由于我不这样做,我如何监听偏好变化？

我已经尝试在我的PreferenceFragment中实现OnSharedPreferenceChangeListener但它似乎不起作用(onSharedPreferenceChanged似乎永远不会被调用).

到目前为止这是我的代码:

SettingsActivity.java

public class SettingsActivity extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        // Display the fragment as the main content.
        getFragmentManager().beginTransaction().replace(android.R.id.content, new SettingsFragment()).commit();
    }
}

SettingsFragment.java

public class SettingsFragment extends PreferenceFragment implements OnSharedPreferenceChangeListener
{
    public static final String KEY_PREF_EXERCISES = "pref_number_of_exercises";

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        // Load the preferences from an XML resource
        addPreferencesFromResource(R.xml.preferences);
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key)
    {
        //IT NEVER GETS …