public class MainActivity extends Activity {
SharedPreferences sharedPreferences=null;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction().replace(android.R.id.content, new My_PreferenceFragment(), "111").commit();
}
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {

return super.onOptionsItemSelected(item);
}
}

public class My_PreferenceFragment extends PreferenceFragment {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
PreferenceScreen a=(PreferenceScreen) getPreferenceManager().findPreference("other");
Preference preference=new Preference(getActivity());
preference.setTitle("aaa");
a.addItemFromInflater(preference);//*******添加代码，要的就是这行
}
}