小编oll*_*lle的帖子

我的片段包含主要活动中的recyclerview

Fragment.java

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle   savedInstanceState) {
    super.onCreate(savedInstanceState);
    View view  = inflater.inflate(R.layout.activity_main, container, false);
    initInstances(view);
    setRetainInstance(true);
    return view;
}

private void initInstances(View view) {
    mRecyclerView = (RecyclerView) view.findViewById(R.id.dialogList);
    mLayoutManager = new LinearLayoutManager(getActivity());
    mRecyclerView.setLayoutManager(mLayoutManager);
    adapter = new MyAdapter(items);
    mRecyclerView.setAdapter(mAdapter);
}

MainActivity.java

在onCreate方法中:

myFragment = (MyFragment) getSupportFragmentManager().findFragmentByTag(MyFragment.TAG);
if (MyFragment == null) {
    MyFragment = new MyFragment();
    getSupportFragmentManager().beginTransaction().add(R.id.content_frame,
            myFragment, MyFragment.TAG).commit();
}

但是当方向改变时,我的RecyclerView会重新绘制.

我已尝试使用覆盖保存状态,onSaveInstanceState并且onRestoreInstanceState像这样如何防止自定义视图在屏幕方向更改时丢失状态或保存和恢复视图状态android,但对我无效

如何在方向改变时正确保存RecyclerView和适配器项目的状态？

解决方案: 我的片段使用一些方法从BaseFragment扩展: …

我正在尝试将XMLfile解析为mysqldb.这是xml

<categories>
<category id="28">Woman</category>
<category id="277" parentId="28">T-Shirts</category>
<category id="140" parentId="277">shorts</category>
</category>

的.py

for category in categories:
        for item in category.getElementsByTagName("category"):
            category_name = item.childNodes[0].nodeValue.encode("utf-8")
            category_id = int(item.getAttribute('id'))
            category_parentId = item.getAttribute('parentId')
#connect etc
sqlFillCategories = "INSERT INTO categories(category_id, category_parentId, shop_id, category_name) VALUES ('"+category_id + "', '" + category_parentId + "', '" + TREND_BRANDS_SHOPID + "', '" + category_name + "');"

错误:

Traceback (most recent call last):
  File "E:/python1/fanswell/parse.py", line 23, in <module>
    sqlFillCategories = "INSERT INTO categories(category_id, category_parentId, shop_id, category_name) VALUES ('"+category_id …