FragmentTabHost切换Fragment时避免UI重新加载

FragmentTabHost切换Fragment时避免UI重新加载

每次FragmentTabHost切换fragment时会调用onCreateView()重绘UI。 

解决方法，在fragment onCreateView 里缓存View: 

private View rootView;// 缓存Fragment view
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState){
    Log.i(TAG, "onCreateView");
    if (rootView == null){
      rootView = inflater.inflate(R.layout.fragment_1, null);
    }
    // 缓存的rootView需要判断是否已经被加过parent，如果有parent需要从parent删除，要不然会发生这个rootview已经有parent的错误。
    ViewGroup parent = (ViewGroup) rootView.getParent();
    if (parent != null){
      parent.removeView(rootView);
    }
    return rootView;
  }