환경 설정이 작동하지 않습니다.

Question

내 응용 프로그램에서 환경 설정에 문제가 있습니다.

<?xml version="1.0" encoding="utf-8"?> 
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"> 


     <!-- General screen --> 
     <PreferenceCategory 
       android:title="@string/general_category" 
       android:key="prefGeneralCategory"> 
     <CheckBoxPreference 
         android:icon="@drawable/content_discard" 
         android:title="@string/pref_general_vibration" 
         android:defaultValue="false" 
         android:key="prefVibration" 
         android:summaryOn="checked" 
         android:summaryOff="unchecked" 
         /> 
         <!-- android:summary="@string/pref_general_vibration_description" --> 

     <CheckBoxPreference 
         android:title="@string/pref_general_record_battery" 
         android:defaultValue="true" 
         android:summary="@string/pref_general_record_battery_description" 
         android:key="prefRecordBattery" /> 

     <ListPreference 
         android:title="@string/pref_network_type" 
         android:summary="@string/pref_network_type_description" 
         android:key="prefNetworkType" 
         android:defaultValue="1" 
         android:entries="@array/prefNetworkArray" 
         android:entryValues="@array/prefNetworkValues" /> 
     </PreferenceCategory> 

     <!-- Network screen --> 

     <PreferenceCategory 
       android:title="@string/pref_network_screen" 
       android:key="prefNetworkCategory"> 

     <PreferenceScreen 
       android:title="@string/pref_network_screen" 
       android:key="prefNetworkScreen" 
       > 
       <CheckBoxPreference 
         android:title="@string/pref_network_update" 
         android:defaultValue="false" 
         android:summary="@string/pref_network_update_description" 
         android:key="prefUpdate" /> 

     </PreferenceScreen> 
     </PreferenceCategory> 
</PreferenceScreen> 

내 일반 화면이 괜찮습니다,하지만 두 번째 화면 (네트워크 화면) 검은 색 (아래 그림)

그리고 두 번째 문제는 함께 :

나는 preference.xml를 생성 ListPreference. 그것은 나에게 오류를 제공합니다

04-24 15:20:29.689: E/AndroidRuntime(399): FATAL EXCEPTION: main 
04-24 15:20:29.689: E/AndroidRuntime(399): java.lang.NullPointerException 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.preference.ListPreference.findIndexOfValue(ListPreference.java:169) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.preference.ListPreference.getValueIndex(ListPreference.java:178) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.preference.ListPreference.onPrepareDialogBuilder(ListPreference.java:190) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.preference.DialogPreference.showDialog(DialogPreference.java:293) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.preference.DialogPreference.onClick(DialogPreference.java:264) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.preference.Preference.performClick(Preference.java:810) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.preference.PreferenceScreen.onItemClick(PreferenceScreen.java:190) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.widget.AdapterView.performItemClick(AdapterView.java:284) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.widget.ListView.performItemClick(ListView.java:3513) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1812) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.os.Handler.handleCallback(Handler.java:587) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.os.Handler.dispatchMessage(Handler.java:92) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.os.Looper.loop(Looper.java:123) 
04-24 15:20:29.689: E/AndroidRuntime(399): at android.app.ActivityThread.main(ActivityThread.java:3683) 
04-24 15:20:29.689: E/AndroidRuntime(399): at java.lang.reflect.Method.invokeNative(Native Method) 
04-24 15:20:29.689: E/AndroidRuntime(399): at java.lang.reflect.Method.invoke(Method.java:507) 
04-24 15:20:29.689: E/AndroidRuntime(399): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
04-24 15:20:29.689: E/AndroidRuntime(399): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
04-24 15:20:29.689: E/AndroidRuntime(399): at dalvik.system.NativeStart.main(Native Method) 

이 내 다른 파일입니다 : PreferenceActivity를 I에서

<resources> 
... 

    <string name="general_category">Obecné</string> 
     <string name="pref_general_vibration">Povolit vibrace</string> 
     <string name="pref_general_record_battery">Kontrola baterie</string> 
     <string name="pref_general_record_battery_description">vypnout nahrávání, pokud je baterie pod 20%</string> 


    <string name="pref_network_screen">Síťové nastavení</string> 
     <string name="pref_network_type">Volba sítě</string> 
     <string name="pref_network_type_description">Vyberte typ připojení</string> 
     <string name="pref_network_update">Automatické aktualizace</string> 
     <string name="pref_network_update_description">Povolení k automatické aktualizace aplikace</string> 

    <string-array name="prefNetworkArray"> 
    <item name="net1">wifi (default)</item> 
    <item name="net2">3G</item> 
    <item name="net3">wifi/3G</item> 
    </string-array> 
    <integer-array name="prefNetworkValues"> 
    <item name="net1">1</item> 
    <item name="net2">2</item> 
    <item name="net3">3</item> 
    </integer-array> 

... 

</resources> 

만 있습니다

public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     addPreferencesFromResource(R.layout.preferences); } 

당신은 누구 제발 도와 드릴까요?

Answer 1

nullPointerException의 두 번째 문제가 수정되었습니다. ListPreference가 정수 배열과 작동하지 않으므로 문자열 배열로 변경했습니다.

<string-array name="prefNetworkArray"> 
<item name="net1">wifi (default)</item> 
<item name="net2">3G</item> 
<item name="net3">wifi/3G</item> 
</string-array> 
<string-array name="prefNetworkValues"> 
<item name="net1">1</item> 
<item name="net2">2</item> 
<item name="net3">3</item> 
</string-array>