Fragment保存页面不销毁

在用fragmenttabhost做页面切换的时候，发现只要一来回切换fragment，fragment页面就会重新初始化，也就是执行onCreateView()方法，导致每次Fragment的布局都重绘，无法保持Fragment原有状态

解决方案：

在Fragment onCreateView方法中缓存View

代码实现：

protected WeakReference<View> mRootView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // detach/attach can lead to view recreate frequently
        if (mRootView == null || mRootView.get() == null) {
            View view=inflater.inflate(R.layout.tab_fragment, null);  
            mRootView = new WeakReference<View>(view);
        } else {
            ViewGroup parent = (ViewGroup) mRootView.get().getParent();
            if (parent != null) {
                parent.removeView(mRootView.get());
            }
        }
        return mRootView.get();
    }