如何使用保存的首选项android存储和检索(键，值)类型的数据 [英] how to store and retrieve (key,value) kind of data using saved preferences android

问题描述

我有一个如下的哈希映射表，

I have a hash map table as below,

HashMap<String, String> backUpCurency_values = new HashMap<String, String>();

我想存储这些值以备将来使用.. 我该怎么做?

and i want to store these value for future use.. how can i do that?

我会将国家名称和货币值存储为键值对...

i will store to Country names and currencyvalue as key and value pair...

推荐答案

你应该只使用一个 for-each 循环并像这样遍历地图:

You should just use a for-each loop and iterate through the map like this:

SharedPreferences.Editor editor = getSharedPreferences(PREFS_NAME, 0).edit();

for( Entry<String, String> entry : backUpCurency_values.entrySet() ) 
  editor.putString( entry.getKey(), entry.getValue() );

editor.commit();

然后，当您需要取回您的值以供以后使用时，请执行以下操作(前提是此 SharedPreference-object 是为货币保留的):

Then when you need to get your values back for later use you do the following (provided that this SharedPreference-object is reserved for currency):

SharedPreferences prefs = getSharedPreferences(PREFS_NAME, 0);

for( Entry<String, ?> entry : prefs.getAll().entrySet() ) 
  backUpCurency_values.put( entry.getKey(), entry.getValue().toString() );

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