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Je fais un analyseur JSON, et je veux afficher des informations dans le même ListView. J'essaie d'utiliser AsynkTask mais cela n'a pas fonctionné. Pour ListView, je crée un Plase et un adaptateur de classe simple qui s'étend à partir de ArrayAdapter.Pourquoi AsyncTask ne fonctionnait pas correctement?
Il est mon code:
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
public class ListActivity extends Activity {
private static final String API_START = "http://api.yelp.com/business_review_search?location=";
private static final String API_END = "&ywsid=mlNrKepTs01H6gB0yoIWrw";
private String mRequestURL = "http://api.yelp.com/business_review_search?location=New%20York&ywsid=mlNrKepTs01H6gB0yoIWrw";
public static ArrayAdapter<Place> mAdapter = null;
private ListView mListView;
ArrayList<Place> arrayList = new ArrayList<Place>();
ProgressDialog dialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list);
if (mRequestURL == null) {
mRequestURL ="http://api.yelp.com/business_review_search?location=New%20York&ywsid=mlNrKepTs01H6gB0yoIWrw";
}
if (mAdapter==null && mRequestURL!=null) {
new DownloadFilesTask().execute(mRequestURL, null, null);
mAdapter = new Adapter(ListActivity.this, arrayList);
}
mListView = (ListView) findViewById(R.id.list);
mListView.setAdapter(mAdapter);
}
private class DownloadFilesTask extends AsyncTask<String, Void, Void> {
@Override
protected void onPreExecute() {
dialog = new ProgressDialog(ListActivity.this);
dialog.setMessage("Please wait");
dialog.setIndeterminate(true);
dialog.setCancelable(true);
dialog.show();
}
protected Void doInBackground(String... urls) {
try {
arrayList = parse(mRequestURL);
} catch (IOException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
} catch (ParseException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
return(null);
}
@Override
protected void onPostExecute(Void places) {
dialog.dismiss();
}
}
private ArrayList<Place> parse(String u) throws IOException, ParseException {
URL url = new URL(u);
StringBuilder sb = new StringBuilder();
URLConnection yc = url.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
String s;
while ((s=in.readLine()) != null)
sb.append(s);
in.close();
JSONParser parser = new JSONParser();
Object o = parser.parse(sb.toString());
JSONObject jsonObject1 = (JSONObject) o;
JSONArray jsonArray = (JSONArray) jsonObject1.get("businesses");
for(int i=0; i<jsonArray.size(); i++) {
JSONObject obj = (JSONObject) jsonArray.get(i);
URL photo_url = new URL((String) obj.get("photo_url"));
URL place_url = new URL((String) obj.get("url"));
String name = (String) obj.get("name");
String address = obj.get("city") + " " + obj.get("address1");
long latitude = Long.parseLong((String) obj.get("latitude"));
long longitude = Long.parseLong((String) obj.get("longitude"));
arrayList.add(new Place(photo_url, name, address, place_url, latitude, longitude));
}
File file = new File("File.txt");
ObjectOutputStream oout = new ObjectOutputStream(openFileOutput("File.txt" , 0));
oout.writeObject(arrayList);
oout.close();
return arrayList;
}
}
Mon application mourir avec cette erros:
07-26 14:23:04.246: ERROR/AndroidRuntime(9262): FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:200)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
at java.lang.Thread.run(Thread.java:1096)
Caused by: java.lang.ClassCastException: java.lang.Double
at com.example.ListActivity.parse(ListActivity.java:105)
at com.example.ListActivity.access$200(ListActivity.java:20)
at com.example.ListActivity$DownloadFilesTask.doInBackground(ListActivity.java:69)
at com.example.ListActivity$DownloadFilesTask.doInBackground(ListActivity.java:55)
at android.os.AsyncTask$2.call(AsyncTask.java:185)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
... 4 more
07-26 14:23:04.658: ERROR/WindowManager(9262): Activity com.example.ListActivity has leaked window [email protected] that was originally added here
android.view.WindowLeaked: Activity com.example.ListActivity has leaked window [email protected] that was originally added here
at android.view.ViewRoot.<init>(ViewRoot.java:247)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
at android.view.Window$LocalWindowManager.addView(Window.java:424)
at android.app.Dialog.show(Dialog.java:241)
at com.example.ListActivity$DownloadFilesTask.onPreExecute(ListActivity.java:63)
at android.os.AsyncTask.execute(AsyncTask.java:391)
at com.example.ListActivity.onCreate(ListActivity.java:46)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
at android.app.ActivityThread.access$2300(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
"Cela n'a pas fonctionné" - veuillez élaborer. –