Fragment 中的 Android SharedPreferences

Android SharedPreferences in Fragment

提问by Mark

I am trying to read SharedPreferences inside Fragment. My code is what I use to get preferences in any other Activity.

我正在尝试读取 Fragment 中的 SharedPreferences。我的代码是我用来在任何其他活动中获取首选项的代码。

     SharedPreferences preferences = getSharedPreferences("pref", 0);

I get error

我得到错误

    Cannot make a static reference to the non-static method getSharedPreferences(String, int) from the type ContextWrapper    

I have tried to follow these links but with no luck Accessing SharedPreferences through static methodsand Static SharedPreferences. Thank you for any solution.

我试图遵循这些链接，但没有成功通过静态方法和 静态 SharedPreferences访问SharedPreferences。感谢您提供任何解决方案。

回答by Jug6ernaut

The method getSharedPreferencesis a method of the Contextobject, so just calling getSharedPreferences from a Fragmentwill not work...because it is not a Context! (Activity is an extension of Context, so we can call getSharedPreferences from it).

该方法getSharedPreferences是Context对象的方法，因此仅从 a 中调用 getSharedPreferences 是Fragment行不通的...因为它不是 Context！（Activity 是 Context 的扩展，因此我们可以从中调用 getSharedPreferences）。

So you have to get your applications Context by

所以你必须得到你的应用程序上下文

// this = your fragment
SharedPreferences preferences = this.getActivity().getSharedPreferences("pref", Context.MODE_PRIVATE);

回答by Leon

The marked answer didn't work for me, I had to use

标记的答案对我不起作用，我不得不使用

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());

EDIT:

编辑：

Or just try removing the this:

或者只是尝试删除this：

SharedPreferences prefs = getActivity().getSharedPreferences("pref", Context.MODE_PRIVATE);

回答by ed209

As a note of caution this answer provided by the user above me is correct.

请注意，我上面的用户提供的这个答案是正确的。

SharedPreferences preferences = this.getActivity().getSharedPreferences("pref",0);

However, if you attempt to get anything in the fragment before onAttach is called getActivity() will return null.

但是，如果您尝试在 onAttach 调用之前获取片段中的任何内容，则 getActivity() 将返回 null。

回答by misbahm3

You can make the SharedPrefencesin onAttachmethod of fragment like this:

您可以像这样制作片段的SharedPrefencesinonAttach方法：

@Override
public void onAttach(Context context) {
    super.onAttach(context);
    SharedPreferences preferences = context.getSharedPreferences("pref", 0);
}

回答by Abdeljabar Taoufikallah

This did the trick for me

这对我有用

SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getContext());

Check here https://developer.android.com/guide/topics/ui/settings.html#ReadingPrefs

在这里查看https://developer.android.com/guide/topics/ui/settings.html#ReadingPrefs

回答by Kirguduck

getActivity()and onAttach()didnot help me in same situation
maybe I did something wrong
but! I found another decision
I have created a field Context thisContextinside my Fragment
And got a current context from method onCreateView
and now I can work with shared pref from fragment

getActivity()并onAttach()因此未帮助我在相同的情况下
，也许我做错了什么事
，但！我发现了另一个决定，
我Context thisContext在 Fragment 中创建了一个字段，
并从 onCreateView 方法中获取了当前上下文
，现在我可以使用Fragment 中的共享首选项

public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {   
...   
thisContext = container.getContext();   
...   
}

回答by user11809346

To define the preference in Fragment:SharedPreferences pref = getActivity().getSharedPreferences("CargaDatosCR",Context.MODE_PRIVATE); editor.putString("credi_credito",cre); editor.commit();

在 Fragment 中定义首选项：SharedPreferences pref = getActivity().getSharedPreferences("CargaDatosCR",Context.MODE_PRIVATE); editor.putString("credi_credito",cre); editor.commit();

To call another activity or fragment the preference data:SharedPreferences pref = getActivity().getSharedPreferences("CargaDatosCR", Context.MODE_PRIVATE); credit=pref.getString("credi_credito",""); if(credit.isNotEmpty)...

要调用另一个活动或将首选项数据分段：SharedPreferences pref = getActivity().getSharedPreferences("CargaDatosCR", Context.MODE_PRIVATE); credit=pref.getString("credi_credito",""); if(credit.isNotEmpty)...