我知道为什么会出现如下所示的错误
（代码中缺少adapterD.notifyDataSetChanged();语句）但我不确切地知道在哪里调用此方法？
AsyncTask
public class GetAllCustomerTask2 extends AsyncTask<ApiConnector, Long, Void>{
@Override
protected void onPreExecute() {
super.onPreExecute();
next.setVisibility(View.GONE);
previous.setVisibility(View.GONE);
}
@Override
protected Void doInBackground(ApiConnector... params) {
List<NameValuePair> nameValuePairss = new ArrayList<NameValuePair>(1);
nameValuePairss.add(new BasicNameValuePair("token",token));
nameValuePairss.add(new BasicNameValuePair("pageSize",pageSize+""));
nameValuePairss.add(new BasicNameValuePair("pageNo",pageNumber+""));
try {
if(!isCancelled()) {
jsonString = jsonParser.makeHttpRequest(url2+driverId+"/bookings", "GET", nameValuePairss);
jsonObject=new JSONObject(jsonString);
jsonResponseArray = jsonObject.getJSONArray("response");
if(jsonResponseArray!=null){
DutiesArrayList.clear();
duties.clear();
for (int i = 0;
i < jsonResponseArray.length();
i++) {
Duties d=new Duties();
JSONObject c = jsonResponseArray.getJSONObject(i);
destinationLabel = c.getString("destinationLabel");
if (destinationLabel.length() <= 4) {
destinationLabel="";
}
// if(destinationLabel.length()==0 || destinationLabel.length()==4 ){
String iddD = c.getString("id");
d.setid(iddD);
String pickupLabelD = c.getString("pickupLabel");
d.setpickupLabel(pickupLabelD);
String statusD = c.getString("status");
d.setstatus(statusD);
d.setdestinationLabel(destinationLabel);
duties.add(d);
// destinationLabelD = c.getString("destinationLabel");
// if(statusD!="pending"){
HashMap<String, String> contactD = new HashMap<String, String>();
// contact.put(TAG_ID, Status);
contactD.put(D1, iddD);
contactD.put(D2, pickupLabelD);
contactD.put(D3, statusD);
contactD.put(D4, destinationLabel);
DutiesArrayList.add(contactD);
// Collections.reverse(DutiesArrayList);
//
}
//
}
}
count=DutiesArrayList.size();
}
else {
Toast.makeText(getActivity(), "No More Duties", Toast.LENGTH_LONG).show();
}
}
else Toast.makeText(getActivity(), "Cancelled bhai cancelled",Toast.LENGTH_LONG).show();
}
catch (JSONException e) {
// TODO Auto-generated catch block e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void jsonArray) {
if(getActivity()!=null){
if(tap.equals("2")){
tap="1";
}
next.setVisibility(View.VISIBLE);
previous.setVisibility(View.VISIBLE);
if(pageNumber>1){
previous.setVisibility(View.VISIBLE);
}
else {
previous.setVisibility(View.GONE);
}
if(count<10){
next.setVisibility(View.GONE);
previous.setVisibility(View.VISIBLE);
}
adapterD = new DutiesAdpter(getActivity(), duties);
lvDuties.setAdapter(adapterD);
adapterD.notifyDataSetChanged();
lvDuties.setEmptyView(getView().findViewById(R.id.emptyElementD));
}
else{
gtask2.cancel(true);
gtask.cancel(true);
}
}
}
堆栈追踪：
04-24 17:14:11.325: E/AndroidRuntime(8432): FATAL EXCEPTION: main
04-24 17:14:11.325: E/AndroidRuntime(8432): 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(2131099863, class com.example.driverapp.PullToRefreshListView) with Adapter(class android.widget.HeaderViewListAdapter)]
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.ListView.layoutChildren(ListView.java:1548)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.AbsListView.onLayout(AbsListView.java:2037)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.View.layout(View.java:14118)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewGroup.layout(ViewGroup.java:4467)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.View.layout(View.java:14118)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewGroup.layout(ViewGroup.java:4467)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1670)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1528)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.LinearLayout.onLayout(LinearLayout.java:1441)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.View.layout(View.java:14118)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewGroup.layout(ViewGroup.java:4467)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.View.layout(View.java:14118)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewGroup.layout(ViewGroup.java:4467)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1594)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.View.layout(View.java:14118)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewGroup.layout(ViewGroup.java:4467)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1670)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1528)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.LinearLayout.onLayout(LinearLayout.java:1441)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.View.layout(View.java:14118)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewGroup.layout(ViewGroup.java:4467)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.View.layout(View.java:14118)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewGroup.layout(ViewGroup.java:4467)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1670)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1528)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.LinearLayout.onLayout(LinearLayout.java:1441)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.View.layout(View.java:14118)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewGroup.layout(ViewGroup.java:4467)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.View.layout(View.java:14118)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewGroup.layout(ViewGroup.java:4467)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2183)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1947)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1139)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4872)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:776)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.Choreographer.doCallbacks(Choreographer.java:579)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.Choreographer.doFrame(Choreographer.java:548)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:762)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.os.Handler.handleCallback(Handler.java:800)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.os.Handler.dispatchMessage(Handler.java:100)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.os.Looper.loop(Looper.java:194)
04-24 17:14:11.325: E/AndroidRuntime(8432): at android.app.ActivityThread.main(ActivityThread.java:5371)
04-24 17:14:11.325: E/AndroidRuntime(8432): at java.lang.reflect.Method.invokeNative(Native Method)
04-24 17:14:11.325: E/AndroidRuntime(8432): at java.lang.reflect.Method.invoke(Method.java:525)
04-24 17:14:11.325: E/AndroidRuntime(8432): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
04-24 17:14:11.325: E/AndroidRuntime(8432): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
04-24 17:14:11.325: E/AndroidRuntime(8432): at dalvik.system.NativeStart.main(Native Method)
请帮助：）
答案 0 :(得分：0)
尝试添加此内容。它应该从主线程调用。
runOnUiThread(new Runnable() {
@Override
public void run() {
lvDuties.setAdapter(adapterD);
adapterD.notifyDataSetChanged();
}
});
答案 1 :(得分：0)
将适配器设置为listview，在其中初始化listview，而不是在后台线程中。每当您的数据集发生更改时，请在后台线程中使用notifyDataSetChanged()更新适配器。