大家好我有一个大问题...... 我有两个asynctask ...
arrivi.java：
public class arrivi extends Fragment implements InterfaceTaskFinished{
ListView list;
int thread = 0;
List<RowItem> rowItems;
public String[] lista = new String[200];
public String[] Compagnia = new String[200];
public String[] CodiceVolo = new String[200];
public String[] Citta = new String[200];
public String[] OraPrevista = new String[200];
public String[] OraStimata = new String[200];
public String[] StatoVolo = new String[200];
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View arrivi = inflater.inflate(R.layout.arrivi, container, false);
new Arrivi(this).execute();
// new partenze().new Partenze().execute();
return arrivi;
}
public class Arrivi extends AsyncTask<String, Integer, Boolean> {
ProgressDialog prog;
// String info;
boolean result;
private final InterfaceTaskFinished listener;
public Arrivi(InterfaceTaskFinished listener) {
this.listener = listener;
}
@Override
protected void onPreExecute() {
prog = new ProgressDialog(getActivity());
prog.setMessage("Connessione in corso...");
prog.show();
prog.setCanceledOnTouchOutside(false);
prog.setCancelable(false);
}
@Override
protected Boolean doInBackground(String... params) {
try {
org.jsoup.nodes.Document doc = Jsoup.connect("http://s.eu").timeout(7*1000).get();
org.jsoup.nodes.Element tabella = doc.getElementsByClass("tabella-voli").first();
Iterator<org.jsoup.nodes.Element> iterator = tabella.select("td").iterator();
while(iterator.hasNext()){
thread++;
Compagnia[thread] = iterator.next().text();
CodiceVolo[thread] = iterator.next().text();
Citta[thread] = iterator.next().text();
OraPrevista[thread] = iterator.next().text();
OraStimata[thread] = iterator.next().text();
StatoVolo[thread] = iterator.next().text();
System.out.println(StatoVolo[thread]);
}
}catch (IOException e) {
e.printStackTrace();
}return true;
}
@Override
protected void onPostExecute(Boolean result) {
if(!result) {
return;
}
if(listener != null) {
prog.dismiss();
CheckRow();
listener.onTaskFinished();
}
}
}// FINE THREAD
public void CheckRow(){
rowItems = new ArrayList<RowItem>();
for (int i = 1; i <= thread; i++) {
RowItem item = new RowItem(Compagnia[i], CodiceVolo[i], Citta[i],OraPrevista[i], OraStimata[i], StatoVolo[i]);
rowItems.add(item);
}
list=(ListView)getActivity().findViewById(R.id.listView1);
CustomBaseAdapter adapter = new CustomBaseAdapter(getActivity(), rowItems);
list.setAdapter(adapter);
}
@Override
public void onTaskFinished() {
// TODO Auto-generated method stub
new partenze();
new partenze().new Partenze().execute();
}
}
partenze.java：
public class partenze extends Fragment {
ListView list;
int thread = 0;
List<RowItem> rowItems;
public String[] lista = new String[200];
public String[] Compagnia = new String[200];
public String[] CodiceVolo = new String[200];
public String[] Citta = new String[200];
public String[] OraPrevista = new String[200];
public String[] OraStimata = new String[200];
public String[] StatoVolo = new String[200];
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View partenze = inflater.inflate(R.layout.partenze, container, false);
// new Partenze().execute("");
return partenze;
}
public class Partenze extends AsyncTask<String, Void, String> {
ProgressDialog prog;
String info;
@Override
protected void onPreExecute() {
}
@Override
protected String doInBackground(String... params) {
try {
org.jsoup.nodes.Document doc = Jsoup.connect("http://s.eu").timeout(7*1000).get();
org.jsoup.nodes.Element tabella = doc.getElementsByClass("tabella-voli").get(1);
Iterator<org.jsoup.nodes.Element> iterator = tabella.select("td").iterator();
while(iterator.hasNext()){
thread++;
Compagnia[thread] = iterator.next().text();
CodiceVolo[thread] = iterator.next().text();
Citta[thread] = iterator.next().text();
OraPrevista[thread] = iterator.next().text();
OraStimata[thread] = iterator.next().text();
StatoVolo[thread] = iterator.next().text();
}
}catch (IOException e) {
e.printStackTrace();
}return info;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
// prog.dismiss();
CheckRow();
}
}// FINE THREAD
public void CheckRow(){
rowItems = new ArrayList<RowItem>();
for (int i = 1; i <= thread; i++) {
RowItem item = new RowItem(Compagnia[i], CodiceVolo[i], Citta[i],OraPrevista[i], OraStimata[i], StatoVolo[i]);
rowItems.add(item);
}
list=(ListView)getActivity().findViewById(R.id.listView2);
CustomBaseAdapter adapter = new CustomBaseAdapter(getActivity(), rowItems);
list.setAdapter(adapter);
}
}
错误是：
04-22 19:19:20.860: E/AndroidRuntime(23765): at com.gianni.app.partenze.CheckRow(partenze.java:92)
它是：
list=(ListView)getActivity().findViewById(R.id.listView2);
我需要为wiew创建...有一个执行第二个线程的解决方案
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View partenze = inflater.inflate(R.layout.partenze, container, false);
return partenze;
}
???? 然后doInBackground ......等...... 谢谢!!
答案 0 :(得分：0)
这个问题非常不清楚，但我会抓住你想要做的事情。
如果你真的需要做这样的多个任务，你真的应该使用Service来在后台处理这些，特别是因为你有一些交叉代码。
如果你有需要在自己的线程中完成的任务，但是有序的你应该考虑旋转新的Runnable线程，然后创建一个情况，其中下一个无法启动而不被另一个线程旋转，然后自己关闭。
旋转新线程：
new Thread(new ConnectThread()).start();
Runnable线程类：
class ConnectThread implements Runnable {
@Override
public void run() {
while (!Thread.currentThread().isInterrupted()) {
//Do Stuff
if(finish){
//stop the thread and start the other passing variables
//Use this to stop the thread
Thread.currentThread().interrupt();
}
}
AsyncTask应该只在您需要只有该Activity需要的信息时使用，并且它还会占用一个Activity可以使用的资源。使用通用Service类来处理切换更容易，性能更高。
这有帮助吗？
答案 1 :(得分：0)
04-22 19:19:20.860: E/AndroidRuntime(23765): at com.gianni.app.partenze.CheckRow(partenze.java:92)
这只是日志输出中的一行，它告诉您错误发生的部分，而不是实际发生的情况。您需要显示更多的堆栈跟踪。
list=(ListView)getActivity().findViewById(R.id.listView2);
将此更改为致电
list = (ListView) getView().findViewById(R.id.listView2);
如果这不起作用，那么您的XML可能有问题（可能它没有返回列表视图）。发布XML。