AndroidFragment切换

fragment方式
这样做的好处是，每个Fragment切换只进行一次初始化。

public class Tab1Fragment extends Fragment {    public Tab1Fragment() {    }    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_tab1, container, false);    }    @Override    public void onViewCreated(View view, Bundle savedInstanceState) {        super.onViewCreated(view, savedInstanceState);        final ProgressBar progressBar = (ProgressBar) view.findViewById(R.id.progressbar);        final TextView tv = (TextView) view.findViewById(R.id.tv);        new Handler().postDelayed(new Runnable() {            @Override            public void run() {                progressBar.setVisibility(View.GONE);                tv.setVisibility(View.VISIBLE);            }        }, 2000);    }    @Override    public void onAttach(Activity activity) {        super.onAttach(activity);    }    @Override    public void onDetach() {        super.onDetach();    }}

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