首先感谢CommonsWare这个伟大的组件。但我有一个问题让我很伤心。即--> java.lang.IllegalStateException: 适配器的内容发生了变化但是ListView没有收到通知。确保适配器的内容不是从后台线程修改的，而只是从 UI 线程修改的。
以上是我有时会遇到的错误，但有时不会。以下是我的代码。
protected boolean cacheInBackground() {
JSONObject json = null;
if(results != null)
results.clear();
results = new ArrayList<DataSource>();// results is the global variable which is List<DataSource> results; and initialized it here.
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("postdata",passeddata));
params.add(new BasicNameValuePair("currentpage", (++index)+""));
json = jParser.makeHttpRequest(urlphp, "POST", params); // Here is the line that makes http request for paginated results based on index and gets the response.
try {
int success = json.getInt("success");
if (success == 1) {
rowcount = json.getInt("numrows");
Log.d("row count value is>>>>",""+rowcount); // Here rowcount is the total rows in the database
products = json.getJSONArray("products");
// looping through All Products
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(ID);
String price = c.getString(PRICE);
String name = c.getString(NAME);
DataSource data = new DataSource(id,name,price);
results.add(data);
}
}else{
// product not found
successpass = success;
message = json.getString("message");
return false;
}
} catch (JSONException e) {
e.printStackTrace();
}
return(getWrappedAdapter().getCount()<rowcount);
}
@Override
protected void appendCachedData() {
if (getWrappedAdapter().getCount()<rowcount) {
@SuppressWarnings("unchecked")
CustomListAdapter adapter = (CustomListAdapter)getWrappedAdapter();
//ArrayAdapter<Integer> a=(ArrayAdapter<Integer>)getWrappedAdapter();
for (DataSource d : results){
adapter.add(d);
}
}else{
}
}
正如您在代码中看到的，我将数据存储到 Bean 类对象中，然后将每个对象存储在 List 中。我已经实现了 CustomListView 以在列表中显示详细信息。
然而，有时会出现上述错误，有时不会。对此进行了很多搜索，发现了这个和其他一些一般的适配器问题，比如这个等，但是即使没有点击placeholder，甚至没有调用，我也会收到这个错误notifyDataSetChanged()。正如您在我的代码中看到的那样，我从未调用过 notifyDataSetChanged()，但为什么会出现此错误？我的实现编码有问题吗？有人可以帮我解决这个问题吗？当我将这个组件深度集成到我的应用程序中时，我现在害怕寻找替代方案。
下面是堆栈跟踪：
03-13 16:12:07.662: E/AndroidRuntime(494): FATAL EXCEPTION: main
03-13 16:12:07.662: E/AndroidRuntime(494): 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(2130968671, class android.widget.ListView) with Adapter(class com.example.onlinedata.ORAdsList$CustomisedEndlessAdapter)]
03-13 16:12:07.662: E/AndroidRuntime(494): at android.widget.ListView.layoutChildren(ListView.java:1492)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.widget.AbsListView.onLayout(AbsListView.java:1147)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.view.View.layout(View.java:7035)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.view.View.layout(View.java:7035)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.view.View.layout(View.java:7035)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.view.View.layout(View.java:7035)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.view.View.layout(View.java:7035)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.view.View.layout(View.java:7035)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.view.ViewRoot.performTraversals(ViewRoot.java:1045)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.os.Handler.dispatchMessage(Handler.java:99)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.os.Looper.loop(Looper.java:123)
03-13 16:12:07.662: E/AndroidRuntime(494): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-13 16:12:07.662: E/AndroidRuntime(494): at java.lang.reflect.Method.invokeNative(Native Method)
03-13 16:12:07.662: E/AndroidRuntime(494): at java.lang.reflect.Method.invoke(Method.java:521)
03-13 16:12:07.662: E/AndroidRuntime(494): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-13 16:12:07.662: E/AndroidRuntime(494): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-13 16:12:07.662: E/AndroidRuntime(494): at dalvik.system.NativeStart.main(Native Method)