public class BaseFragment extends Fragment {    /*布局*/    private View view;    /**/    boolean isVisible = false;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {        view = setRootView(inflater,container);        Log.i("包名："+getClass().getName(),"onCreateView");        return view;    }    protected View setRootView(LayoutInflater inflater, @Nullable ViewGroup container){        return null;    }    protected void initWidght(){};    protected void initData(){};    /**     * 解决预加载     * */    @Override    public void setUserVisibleHint(boolean isVisibleToUser) {        super.setUserVisibleHint(isVisibleToUser);        Log.i("包名："+getClass().getName()," setUserVisibleHint  显示"+getUserVisibleHint());        if (getUserVisibleHint()){            onVisible();            isVisible = true;        }else {//            onInvisible();        }    }    /**     *  预加载--显示-加载数据     * */    private void onVisible() {        if (!isVisible){            initWidght();        }    }    /**     * 预加载--不显示时     * */    private void onInvisible() {        isVisible = false;    }    protected <T extends View>T getView(int resourcesId){        return (T) view.findViewById(resourcesId);    }    /**     * Toast提示;     * @param content 提示内容;     */    protected void showToast(String content) {        Toast.makeText(getActivity(), content, Toast.LENGTH_SHORT).show();    }}

public class IndexChatFragment extends BaseFragment {    TextView mTextView;    @Override    protected View setRootView(LayoutInflater inflater, @Nullable ViewGroup container) {        return inflater.inflate(R.layout.fragment_index_chat,container,false);    }    @Override    protected void initWidght() {        mTextView = getView(R.id.ceshi);        mTextView.setText("赋值测试");    }