Android 而不是finish（）和startActivity（getIntent（））； public class MainActivity extends Activity { private ActionBarDrawerToggle mSlideM

而不是finish（）和startActivity（getIntent（））；

public class MainActivity extends Activity {

     private ActionBarDrawerToggle mSlideMenuToggle;
     private boolean isDarkTheme;
     private static final String InitializedKey = "initialized";

     @Override
 protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
          applySettings();
          setContentView(R.layout.activity_main);
       }

     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
          if (mSlideMenuToggle.onOptionsItemSelected(item)) {
               return true;
          } else if (item.getItemId() == R.id.menu_settings) {
               getFragmentManager().beginTransaction()
                        .replace(R.id.content_frame, new SettingsFragment())
                        .addToBackStack(null)
                        .commit();
               return true;
          } else {
               return super.onOptionsItemSelected(item);
          }
     }

     private void applySettings() {
          isDarkTheme = PreferenceManager.getDefaultSharedPreferences(this).getString(SettingsFragment.ThemeSetting, null).equals("1");
          if (isDarkTheme) {
               setTheme(android.R.style.Theme_Holo);
          } else {
               setTheme(android.R.style.Theme_Holo_Light);
     }
}

public class SettingsFragment extends PreferenceFragment implements SharedPreferences.OnSharedPreferenceChangeListener {

   public static final String ThemeSetting = "isDarkTheme";

   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       addPreferencesFromResource(R.xml.preferences);
   }

   @Override
   public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
       if (key.equals(ThemeSetting)) {
           String[] themes = getResources().getStringArray(R.array.isDarkThemeStrings);
           findPreference(key).setSummary(sharedPreferences.getString(key, "").equals("0") ? themes[0] : themes[1]);
       }
   }

   @Override
   public void onResume() {
       super.onResume();
       PreferenceManager.getDefaultSharedPreferences(getActivity()).registerOnSharedPreferenceChangeListener(this);
   }

   @Override
   public void onPause() {
       super.onPause();
       PreferenceManager.getDefaultSharedPreferences(getActivity()).unregisterOnSharedPreferenceChangeListener(this);
   }

 }

finish();
startActivity(getIntent());