Android片段无法读取包。捆绑包始终为NULL [英] Android fragment can't read bundle. Bundle is always NULL

问题描述

我编写了一个自定义静态方法来创建片段。 Fragment是 android.support.v4.app.Fragment 类的子类。

I wrote a custom static method to create my fragment. Fragment is a subclass of android.support.v4.app.Fragment class.

创建片段的方法如下。

public static AddItemFragment newInstance(UUID listId, UUID itemId){

        AddItemFragment fragment=new AddItemFragment();
        Bundle bundle=new Bundle();
        bundle.putSerializable(EXTRA_DATA_LIST_ID,listId);
        bundle.putSerializable(EXTRA_DATA_ITEM_ID, itemId);
        fragment.setArguments(bundle);
        return fragment;
 }

在我的onCreate方法中，我试图从包中读取数据。

In my onCreate method, I am attempting to read data from bundle.

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mListId = (getArguments().getSerializable(EXTRA_DATA_LIST_ID) == null ? null : (UUID) getArguments().getSerializable(EXTRA_DATA_LIST_ID));
    mItemId = (getArguments().getSerializable(EXTRA_DATA_ITEM_ID) == null ? null : (UUID) getArguments().getSerializable(EXTRA_DATA_ITEM_ID));
}    

问题是 getArguments（）方法永不返回捆绑。它总是返回 NULL 。我不明白为什么。保存实例状态也为NULL。

Well the problem is that getArguments() method never returns bundle. It always returns NULL. I don't understand why. savedInstanceState is NULL as well.

推荐答案

很抱歉，我用Activity的 savedInstanceState 覆盖了片段中设置的捆绑包。捆绑软件，此时为 NULL 。

Silly me was overriding bundle set in the Fragment with Activity's savedInstanceState bundle which at that point is NULL.

DUH ...

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