解决java.lang.IllegalStateException: The content of the adapter has changed but ListView...的问题

我写了一个Dialog，Dialog中有一个ListView，想要点ListView中的一项后，跳转到另外一个Activity去。

但在使用时，会偶尔报出下面的错误：

02-21 14:54:28.928: E/AndroidRuntime(2846): FATAL EXCEPTION: main

02-21 14:54:28.928: E/AndroidRuntime(2846): java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(2131165196, class android.widget.ListView) with Adapter(class com.jovision.multiscreen.views.DeviceScanSelectDialog$DeviceAdapter)]
02-21 14:54:28.928: E/AndroidRuntime(2846):     at android.widget.ListView.layoutChildren(ListView.java:1510)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at android.widget.AbsListView.onTouchModeChanged(AbsListView.java:2077)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at android.view.ViewTreeObserver.dispatchOnTouchModeChanged(ViewTreeObserver.java:591)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at android.view.ViewRoot.ensureTouchModeLocally(ViewRoot.java:2095)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at android.view.ViewRoot.performTraversals(ViewRoot.java:809)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1861)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at android.os.Looper.loop(Looper.java:130)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at android.app.ActivityThread.main(ActivityThread.java:3683)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at java.lang.reflect.Method.invokeNative(Native Method)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at java.lang.reflect.Method.invoke(Method.java:507)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:895)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:653)
02-21 14:54:28.928: E/AndroidRuntime(2846):     at dalvik.system.NativeStart.main(Native Method)

其中错误描述：

The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread.

的意思大体是，你的adapter的内容变化了，但是你的ListView并不知情。请保证你adapter的数据在主线程中进行更改！

知道了原因，改起来就好办多了，我将我的adapter类改为：

  private class DeviceAdapter extends BaseAdapter {private LayoutInflater inflater;private ArrayList<Device> devices;public DeviceAdapter() {inflater = LayoutInflater.from(mContext);}@SuppressWarnings("unchecked")public void setDeviceList(ArrayList<Device> list) {if (list != null) {devices = (ArrayList<Device>) list.clone();notifyDataSetChanged();}}public void clearDeviceList() {if (devices != null) {devices.clear();}notifyDataSetChanged();}@Overridepublic int getCount() {return devices == null ? 0 : devices.size();}

相对于原来，我做了两项改动：

1.将所有数据“完全”保存在adapter内部，即使有外部数据进入，也会用.clone()重新生成副本，保证了数据完全是由adapter维护的。

2.保证所有setDeviceList()/clearDeviceList()是从主线程里调用的，如何保证是从主线程中调用的呢：

　　a.调用Activity.runOnUIThread()方法；

　　b.使用Handler（其实这并不非常准确，因为Handler也可以运行在非UI线程）；

　　c.使用AsyncTask。

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原文：https://blog.csdn.net/ueryueryuery/article/details/20607845?utm_source=copy

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