Question

我有问题，这是我第一次使用PreferenceFragment，当我得到数据时它是空的我不知道问题出在哪里这是我的PreferenceFragment和strings.xml和settings.xml文件请帮忙！

PreferenceFragment

public class SettingsFragment extends PreferenceFragment {
    private EditTextPreference mEditDomainPrefernce;
    private EditTextPreference mEitDomainPrefernce2;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings);
        mEditDomainPrefernce = (EditTextPreference) getPreferenceManager().findPreference("ArabicDomain");


        mEitDomainPrefernce2 = (EditTextPreference) getPreferenceManager().findPreference("KoreanDomain");

        mEitDomainPrefernce2.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
            @Override
            public boolean onPreferenceChange(Preference preference, Object newValue) {
                mEitDomainPrefernce2.setSummary(newValue.toString());
                return true;
            }
        });

        mEditDomainPrefernce.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
            @Override
            public boolean onPreferenceChange(Preference preference, Object newValue) {
                mEditDomainPrefernce.setSummary(newValue.toString());
                return true;
            }
        });

    }


}

的strings.xml

<resources>
    <string name="app_name">My Application</string>
    <string-array name="input">
        <item>English</item>

    </string-array>
    <string-array name="out">
        <item>Arabic</item>
        <item>Korean</item>

    </string-array>
    <string name="default_arabic">http://somelink</string>
    <string name="default_Korean">http://somelink</string>

</resources>

的settings.xml

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

    <PreferenceCategory
        android:title="domain setting">


        <EditTextPreference
            android:key="ArabicDomain"
            android:title="Arabic Domain"
            android:summary="@string/default_arabic"
            android:dialogTitle="change the domain"
            android:defaultValue="@string/default_arabic"
             />

        <EditTextPreference
            android:key="KoreanDomain"
            android:title="Korean Domain"
            android:summary="@string/default_Korean"
            android:dialogTitle="change the domain"
            android:defaultValue="@string/default_Korean"
            />
    </PreferenceCategory>



</PreferenceScreen>

最后我调用了Activity中的getDefaultSharedPreferences

 mArabicDomain =  PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getString("ArabicDomain","");
        mKoreanDomain = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).getString("KoreanDomain","");

结果两个字符串都是空的，请告诉我有什么问题

Answer 1

传递给getDefaultSharedPreferences的第二个参数对应于defalut值。

而不是＆＃34; ＆＃34;尝试＆＃34;一些字符串＆＃34;。

编辑：

试试这个：

sharedPref = PreferenceManager.getDefaultSharedPreferences(this);

EditTextPreference edp = (EditTextPreference)findPreference("KoreanDomain");

sharedPref.getString("KoreanDomain","defValue");

从getDefaultSharedPreferences获取数据始终返回空值

1 个答案: