代理模式? 之前的使用如下。Activity和Fragment同時implement AppTitle ~~~ public abstract class BaseActivity extends Activity implements Handler.Callback, AppTitle { ~~~ ~~~ public class BaseFragment extends Fragment implements AppTitle ~~~ 修改后的 ~~~ public class BaseFragment extends Fragment { private AppTitle appTitle; @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); Log.d("fragment:onCreateView", getView()); // appTitle = new TitleMgr(getActivity(), getView()); appTitle.initTitle(); } public AppTitle getAppTitle() { return appTitle; } public void setAppTitle(AppTitle appTitle) { this.appTitle = appTitle; } ~~~ 采用策略模式 如果某個BaseFragment的樣式不太一樣，可以重新AppTitle模塊。同時又不影響整體app的使用。 默認的實現類是TitleMgr