NullPointerException異常越來越字符串數組爲String []

Question

行，所以我有5個陣列都在他們5種元素在我的strings.xml文件，像這樣：

<string-array name="monday"> 
     <item>monday</item> 
     <item>tuesday</item> 
     <item>wednesday</item> 
     <item>thursday</item> 
     <item>friday</item> 
    </string-array> 

現在我已經在我的代碼switch語句是deppending上他們點擊的按鈕會將這5個數組中的一個設置爲我的主數組。但是我已經嘗試了許多歧方法，但我仍然得到空指針異常在這條線：

Days.masterarray = getResources().getStringArray(R.array.monday); 

也修整這一點，但得到了同樣的結果：

Days.setMasterarray(getResources().getStringArray(R.array.monday)); 

主數組：

public static String[] masterarray = new String[] { "monday", "tuesday", 
      "wednesday", "thursday", "friday" }; 

我已經給它默認值開始。現在，當我運行switch語句中我得到這個：

03-19 13:43:23.555: WARN/System.err(1379): java.lang.NullPointerException 
03-19 13:43:23.586: WARN/System.err(1379):  at android.content.ContextWrapper.getResources(ContextWrapper.java:81) 
03-19 13:43:23.586: WARN/System.err(1379):  at schoolBook.Icestone.Days.setArray(Days.java:77) 
03-19 13:43:23.595: WARN/System.err(1379):  at schoolBook.Icestone.SampleActivity.onCreate(SampleActivity.java:27) 
03-19 13:43:23.605: WARN/System.err(1379):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048) 
03-19 13:43:23.626: WARN/System.err(1379):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1700) 
03-19 13:43:23.626: WARN/System.err(1379):  at android.app.ActivityThread.startActivityNow(ActivityThread.java:1577) 
03-19 13:43:23.635: WARN/System.err(1379):  at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:130) 
03-19 13:43:23.644: WARN/System.err(1379):  at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:342) 
03-19 13:43:23.655: WARN/System.err(1379):  at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:680) 
03-19 13:43:23.676: WARN/System.err(1379):  at android.widget.TabHost.setCurrentTab(TabHost.java:349) 
03-19 13:43:23.676: WARN/System.err(1379):  at android.widget.TabHost.addTab(TabHost.java:239) 
03-19 13:43:23.695: WARN/System.err(1379):  at schoolBook.Icestone.Days.onCreate(Days.java:32) 
03-19 13:43:23.695: WARN/System.err(1379):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048) 
03-19 13:43:23.695: WARN/System.err(1379):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1700) 
03-19 13:43:23.716: WARN/System.err(1379):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1752) 
03-19 13:43:23.716: WARN/System.err(1379):  at android.app.ActivityThread.access$1500(ActivityThread.java:123) 
03-19 13:43:23.716: WARN/System.err(1379):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993) 
03-19 13:43:23.735: WARN/System.err(1379):  at android.os.Handler.dispatchMessage(Handler.java:99) 
03-19 13:43:23.735: WARN/System.err(1379):  at android.os.Looper.loop(Looper.java:126) 
03-19 13:43:23.744: WARN/System.err(1379):  at android.app.ActivityThread.main(ActivityThread.java:3997) 
03-19 13:43:23.754: WARN/System.err(1379):  at java.lang.reflect.Method.invokeNative(Native Method) 
03-19 13:43:23.754: WARN/System.err(1379):  at java.lang.reflect.Method.invoke(Method.java:491) 
03-19 13:43:23.754: WARN/System.err(1379):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
03-19 13:43:23.775: WARN/System.err(1379):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
03-19 13:43:23.775: WARN/System.err(1379):  at dalvik.system.NativeStart.main(Native Method) 

就如何解決這一問題的任何燈光，將不勝感激

Answer 1

我想getResources可能爲空。嘗試要麼

• 放置一個斷點在該行和調試，看它是否爲空（如果它不爲空，然後找出什麼是空）使用上下文
• 。即。
  mContext.getResources().getStringArray(R.array.monday));