android - 关于安卓首选项

Question

我的问题是，当我试图从 listpreference 中选择一个项目时，摘要更改为从数组 settings_listofitems_keys 中选择的数组键。
但我想在布局上将摘要设置为数组 settings_listofitems_values 中的用户可读格式，同时将该值从 settings_listofitems_keys 中保存为首选项中的参数。

Xml 数组文件:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="settings_listofitems_values">
        <item>Green</item>
        <item>Orange</item>
    </string-array> 
    <string-array name="settings_listofitems_keys">
        <item>1</item>
        <item>2</item>
    </string-array>  
</resources>

Xml布局文件:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
    <PreferenceCategory android:title="@string/settings_select_horo" >
        <ListPreference
            android:defaultValue="@string/settings_selectitem"
            android:key="preferenceitem"
            android:entries="@array/settings_listofitems_values"
            android:summary="@string/settings_plsselect"
            android:entryValues="@array/settings_listofitems_keys"
            android:title="@string/settings_plsselect" />
    </PreferenceCategory>
</PreferenceScreen>

代码:

public class UserSettingActivity extends PreferenceActivity implements
        OnPreferenceChangeListener {
    private static final String APP_PREFERENCES = "mypref";
    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.layout.activity_preferences);
            SharedPreferences settings = getSharedPreferences(APP_PREFERENCES,
                        Context.MODE_PRIVATE);
            SharedPreferences.Editor editor = settings.edit();
            ListPreference myid = (ListPreference)
                        findPreference("preferenceitem");
            myid.setOnPreferenceChangeListener(this);
            editor.commit();
    }
    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        preference.setSummary(newValue.toString());
        return true;
    }
}

非常感谢任何帮助。我也可以成为新手的好榜样 =)

Answer 1

编辑器、提交和首选项的所有这些都不起作用 - 改变它!

public class UserSettingActivity extends PreferenceActivity implements
        OnPreferenceChangeListener {
    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.layout.activity_preferences);
            ListPreference myid = (ListPreference)
                        findPreference("preferenceitem");
            myid.setOnPreferenceChangeListener(this);
    }
    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        preference.setSummary(newValue.toString()); // that's ok
        return true;
    }
}

这是您的问题 - 您必须删除摘要行:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
    <PreferenceCategory android:title="@string/settings_select_horo" >
        <ListPreference
            android:defaultValue="@string/settings_selectitem"
            android:key="preferenceitem"
            android:entries="@array/settings_listofitems_values"
            <!-- android:summary="@string/settings_plsselect"-->
            android:entryValues="@array/settings_listofitems_keys"
            android:title="@string/settings_plsselect" />
    </PreferenceCategory>
</PreferenceScreen>