savedInstanceState总是空 [英] savedInstanceState is always null

问题描述

这是我savedInstaceState code：

This is my savedInstaceState code:

@Override
public void onSaveInstanceState(Bundle savedInstanceState) 
{
    savedInstanceState.putStringArrayList("todo_arraylist", Altodo);
    Log.v("bundle", "Saved");
    super.onSaveInstanceState(savedInstanceState);
}


public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);

    if (savedInstanceState != null) 
    {
        Altodo = savedInstanceState.getStringArrayList("todo_arraylist");
        Log.v("bundle", "Restored");
    }
    else
    {
        Log.v("bundle", "null");
    }

    setContentView(R.layout.main);
}

日志总是显示捆绑保存标签。

The logs always show the "bundle save" tag.

但的onCreate 方法， SavedInstanceState 始终为空。

推荐答案

你检查你是否有这种观点的ID设置（如果认为它是/有...）。的onSaveInstanceState（）不叫，否则。

Did you check if you have an Id set for that view ( if a view it is/has...). onSaveInstanceState() is not called otherwise.

勾选此<一个href="http://stackoverflow.com/questions/6678062/when-are-all-the-cases-when-the-onsaveinstancestate-method-called/7023241#7023241">link.

这篇关于savedInstanceState总是空的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！