如何从SharedPreferences中删除一些包含字符串的键? [英] How to remove some key contain a string from SharedPreferences?

问题描述

我的Android SharedPreferences是:

My Android SharedPreferences is:

键，值

美国，jhon

xxxpeter，uk

xxxpeter,uk

luis，mex

xxxangel，ital

xxxangel,ital

都彭，弗兰

xxxcharles，belg

xxxcharles,belg

...

更多行带有xxxname

more lines with xxxname

...

如何删除键中包含xxx的键/值(或以xxx开头).这是我到目前为止所得到的:

How can I delete key/value what contain (or start) with xxx in key. This is what I got so far:

public void Deletekeyxxx() {
    final SharedPreferences.Editor sped = sharedPreferences.edit();     
    if(sped.contains("xxx")){
      sped.remove(sped.contains("xxx"));
    }
    sped.commit();
 }

---

可行！谢谢Ben P.

public void Deletekeyxxx() { 
    final SharedPreferences.Editor sharedPrefsEditor = sharedPreferences.edit();

    Map<String, ?> allEntries = sharedPreferences.getAll();
    for (Map.Entry<String, ?> entry : allEntries.entrySet()) {
        String key = entry.getKey();
        if (key.contains("xxx")) {
           sharedPrefsEditor.remove(key);
        }
      sharedPrefsEditor.commit();
    }
}

推荐答案

您可以使用 SharedPreferences.getAll() 检索Map<String,?>，然后使用Map.keySet()遍历键.也许是这样的:

You can use SharedPreferences.getAll() to retrieve a Map<String,?>, and then use Map.keySet() to iterate over the keys. Maybe something like this:

private void removeBadKeys() {
    SharedPreferences preferences = getSharedPreferences("Mypref", 0);
    SharedPreferences.Editor editor = preferences.edit();

    for (String key : preferences.getAll().keySet()) {
        if (key.startsWith("xxx")) {
            editor.remove(key);
        }
    }

    editor.commit();
}

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