java.lang.IllegalArgumentException: The observer is null.最終解決方案，isnull

java.lang.IllegalArgumentException: The observer is null.最終解決方案，isnull
java.lang.IllegalArgumentException: The observer is null.最終解決方案

在使用資料適配的時候的問題：

java.lang.IllegalArgumentException: The observer is null.at android.database.Observable.unregisterObserver(Observable.java:64)at android.widget.BaseAdapter.unregisterDataSetObserver(BaseAdapter.java:42)at android.widget.AbsListView.onDetachedFromWindow(AbsListView.java:2872)at android.view.View.dispatchDetachedFromWindow(View.java:11908)at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2647)at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2645)at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2645)at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2645)at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2645)at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2645)at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2645)at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2645)at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2645)at android.view.ViewRootImpl.dispatchDetachedFromWindow(ViewRootImpl.java:2685)at android.view.ViewRootImpl.doDie(ViewRootImpl.java:4044)at android.view.ViewRootImpl.die(ViewRootImpl.java:4027)at android.view.WindowManagerImpl.removeViewImmediate(WindowManagerImpl.java:375)at android.view.WindowManagerImpl$CompatModeWrapper.removeViewImmediate(WindowManagerImpl.java:170)at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3352)at android.app.ActivityThread.access$1200(ActivityThread.java:140)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1266)at android.os.Handler.dispatchMessage(Handler.java:99)at android.os.Looper.loop(Looper.java:137)at android.app.ActivityThread.main(ActivityThread.java:4914)at java.lang.reflect.Method.invokeNative(Native Method)at java.lang.reflect.Method.invoke(Method.java:511)at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:808)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:575)at dalvik.system.NativeStart.main(Native Method)

導致的問題所在是BaseAdapter
解決方案：在extends BaseAdapter的時候添加如下代碼即可：

@Overridepublic void unregisterDataSetObserver(DataSetObserver observer) {if (observer != null) {        super.unregisterDataSetObserver(observer);    }}

希望能協助你，加油！

這裡也是我：我的eoe部落格關於這個問題地址

javalangIllegalArgumentException:nullsource這個是什問題?

非法參數異常。在什麼地方傳入參數不合法，比如把String當Int了。
你直接給個錯誤，原始碼都沒，情況太多，沒辦法具體分析。
 
在網頁xhtml中加入js但是報javalangIllegalArgumentException: null source錯誤，大哥大姐幫忙

非法參數異常。在什麼地方傳入參數不合法，比如把String當Int了。