Android ListPreference项将作为索引而不是字符串值进行检索

我正在尝试做一个应用程序，它将预测未来7天的天气数据。我正在添加一个设置活动，用户可以在其中将温度单位更改为华氏或公制

我将其定义为一个ListPreference，其条目取自一个数组，其值为metric和Fahrenheit，如下所示：

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent">
<!--location preference:-->
    <EditTextPreference
        android:key="@string/pref_location_key"
        android:title="@string/locTitle"
        android:defaultValue="@string/pref_location_default"
        android:inputType="text"
        android:singleLine="true"
        android:summary="enter location"/>



    <!--temperature unit preference:-->

 <ListPreference android:key="@string/pref_units_key"
                 android:defaultValue="@string/pref_units_metric"
                 android:title="Temperature Unit"
                 android:summary="select a temperature unit"
                 android:entries="@array/units"
                 android:entryValues="@array/indx"/>




</PreferenceScreen>

pref_units_imperial包含字符串Fahrenheit，但除非将其写入

if (unitType.equalsIgnoreCase ("1")), unitType has been fetched from the shared preferences previously and sent to the method. 

这是我使用的设置类

public class SettingsActivity extends PreferenceActivity
        implements Preference.OnPreferenceChangeListener {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
// Add 'general' preferences, defined in the XML file
// TODO: Add preferences from XML
   addPreferencesFromResource(R.xml.pref_general);
   bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_location_key)));

        bindPreferenceSummaryToValue(findPreference (getString(R.string.pref_units_key))); //this will find the preference value associated with locKey key and pass it to be saved in the shared preferences

    //we are just getting a reference to the preference, we are not fetching any data from it.


    }

    private void bindPreferenceSummaryToValue(Preference preference) { //receives user preference
// Set the listener to watch for value changes.
        preference.setOnPreferenceChangeListener(this);

// Trigger the listener immediately with the preference's
// current value.
        onPreferenceChange(preference,
                PreferenceManager
                        .getDefaultSharedPreferences(preference.getContext()) //conetxt from which this is called. (returns all shared preferences in the app, so you need to distinguish
                        .getString(preference.getKey(), "")); //the key of the setting that has been changed
    }
    @Override
    public boolean onPreferenceChange(Preference preference, Object value) {
        String stringValue = value.toString();

        if (preference instanceof ListPreference) {
            // For list preferences, look up the correct display value in
            // the preference's 'entries' list (since they have separate labels/values).
            ListPreference listPreference = (ListPreference) preference;
            int prefIndex = listPreference.findIndexOfValue(stringValue);
            if (prefIndex >= 0) {
                preference.setSummary(listPreference.getEntries()[prefIndex]); //get the entries we have specified in the array xml by the indices associated with them
            }
        } else {
            // For other preferences, set the summary to the value's simple string representation.
            preference.setSummary(stringValue);
        }
        return true;
    }
}

在这行preference.setSummary（listPreference.getEntries（）[prefIndex]）中，它应该得到华氏温度或公制，但它似乎得到了“0”或“1”，我想得到单位的字符串名称，我试着调试应用程序，但我不知道为什么它要分配索引值而不是条目

谁能帮我解决这个问题吗

感谢您的帮助

---

谢谢。

您解决了这个问题吗？如果没有，您是否只是尝试添加字符串值（不是作为strings.xml的引用）作为输入值？@dania，您找到解决方案了吗？

if (unitType.equalsIgnoreCase ("1")), unitType has been fetched from the shared preferences previously and sent to the method. 

public class SettingsActivity extends PreferenceActivity
        implements Preference.OnPreferenceChangeListener {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
// Add 'general' preferences, defined in the XML file
// TODO: Add preferences from XML
   addPreferencesFromResource(R.xml.pref_general);
   bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_location_key)));

        bindPreferenceSummaryToValue(findPreference (getString(R.string.pref_units_key))); //this will find the preference value associated with locKey key and pass it to be saved in the shared preferences

    //we are just getting a reference to the preference, we are not fetching any data from it.


    }

    private void bindPreferenceSummaryToValue(Preference preference) { //receives user preference
// Set the listener to watch for value changes.
        preference.setOnPreferenceChangeListener(this);

// Trigger the listener immediately with the preference's
// current value.
        onPreferenceChange(preference,
                PreferenceManager
                        .getDefaultSharedPreferences(preference.getContext()) //conetxt from which this is called. (returns all shared preferences in the app, so you need to distinguish
                        .getString(preference.getKey(), "")); //the key of the setting that has been changed
    }
    @Override
    public boolean onPreferenceChange(Preference preference, Object value) {
        String stringValue = value.toString();

        if (preference instanceof ListPreference) {
            // For list preferences, look up the correct display value in
            // the preference's 'entries' list (since they have separate labels/values).
            ListPreference listPreference = (ListPreference) preference;
            int prefIndex = listPreference.findIndexOfValue(stringValue);
            if (prefIndex >= 0) {
                preference.setSummary(listPreference.getEntries()[prefIndex]); //get the entries we have specified in the array xml by the indices associated with them
            }
        } else {
            // For other preferences, set the summary to the value's simple string representation.
            preference.setSummary(stringValue);
        }
        return true;
    }
}