获取共享的首选项并将其显示在列表视图中 [英] Getting shared preferences and displaying them in a listview

问题描述

所以我的主要活动有一些共同的偏好:

So I have some shared preferences in my main activity:

SharedPreferences prefs = this.getSharedPreferences("myFavs", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();

然后我将一些生成的字符串添加为键值对:

And I add some generated strings as a key value pair:

editor.putString(saved,saved);
editor.apply();

在另一个活动中，我希望能够将共享首选项文件中保存的所有键值对显示到ListView中.

In another activity I would like to be able to display all the key value pairs I have saved in my shared preferences file into a ListView.

我曾经使用过类似的东西:

I have used things like:

 ListView listView = (ListView) findViewById(R.id.favsList);
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.listlayout, android.R.id.text1, values );
    listView.setAdapter(adapter);

之前，但是我不确定如何将所有共享首选项转换为可以放入ListView的格式.

before, however I am not sure how to get all my shared preferences into a format that I can put into a ListView.

P.S我应该提到，我实际上只需要一个键或值的列表，因为键和值始终相同.

P.S I should have mentioned I only really need a list of either keys or values as the key and the value are always the same.

我认为这可能已经解决了我的问题:

I think this might have solved my problem:

SharedPreferences prefs = getSharedPreferences("myFavs", 0);
    Map<String, String> m = (Map<String, String>) prefs.getAll();
    List<String> list = new ArrayList<>(m.values());

这正确吗?

推荐答案

如果我理解正确，那么您需要检索所有首选项值.

if I understood in correct sense, what you need is to retrieve all preference values.

为此，您可以使用它；

for that you can use this ;

 Map<String,?> allPrefs = prefs.getAll();      
    for(Map.Entry<String,?> entry : allPrefs.entrySet()){
      String key = entry.getKey();
      String value = entry.getValue().toString();
     }

您可以将值存储到数组中并使用.

you can store the values to an array and use.

更新

更精确

    public String[] fetchAllPreference(){
     String[] values = new String();
     int index = 0;
     Map<String,?> allPrefs = prefs.getAll();      

     for(Map.Entry<String,?> entry : allPrefs.entrySet()){
       value[index++] = entry.getValue().toString();
     }
     return values; 
    }

您可以使用此功能获取所有首选项和返回的String数组，这些数组可以提供给Listview适配器

you can use this function for getting all the preference and the returned String array you can provide to your Listview adapter

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