First of all thanks to CommonsWare for this great component. But I have an issue which has been giving me grief some times. That is --> 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.
The above is the error I get sometimes, but sometimes not. The below is my code.
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{
}
}
As you can see in the code I am storing data into Bean class object and then storing that each object in List. I have implemented CustomListView to show the details in a list.
However sometimes the above error arises and sometimes not. Have searched a lot for this and found this and some other general adapter issues like this etc., But I get this error even without clicking on placeholder and even without calling notifyDataSetChanged(). As you can see in my code I never called notifyDataSetChanged(), but why this error occurs? Is there something wrong with my implementation coding? Can some one please help me solve this issue? As I deeply integrated this component in my application, I am scared now to see for alternatives.
Below is the stack trace:
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)
Somebody finally gave me a reproducible test case, and this bug is now fixed as of v1.2.1. Grab a fresh copy of the repo, or a fresh JAR. No code changes should be required over v1.2.0.