在使用数据适配的时候的问题：

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)

导致的问题所在是BaseAdapter

解决方式：在extends BaseAdapter的时候加入例如以下代码就可以：

	@Override

	public void unregisterDataSetObserver(DataSetObserver observer) {

		if (observer != null) {

	        super.unregisterDataSetObserver(observer);

	    }

	}

希望能帮助你，加油！

这里也是我：我的eoe博客关于这个问题地址