AsyncTask Android Force关闭应用程序

可能重复：

我正在尝试使用一个应用程序来显示YouTube上一个名为illbehonest的频道的可用视频列表。我做错了什么？我正在使用JavaJSON库来实现这一点。每次我尝试转到视频播放活动时，应用程序强制关闭（顺便说一句，其名称与其功能无关）。代码如下：

package com.aer.illbehonest;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;

import org.apache.commons.io.IOUtils;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class VideoPlay extends Activity {   
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_video_play);

        new ShowTitlesTask().execute("");
    }

    class ShowTitlesTask extends AsyncTask<String, Void, ArrayList<String>> {

        ArrayList<String> titlesList;

        @Override
        protected ArrayList<String> doInBackground(String... args) {

            URL jsonURL = null;
            try {
                jsonURL = new URL("http://gdata.youtube.com/feeds/api/users/illbehonest/uploads?v=2&alt=jsonc");
            } catch (MalformedURLException e3) {
                e3.printStackTrace();
            }
            URLConnection jc = null;
            try {
                jc = jsonURL.openConnection();
            } catch (IOException e2) {
                e2.printStackTrace();
            }
                InputStream is = null;
            try {
                is = jc.getInputStream();
        } catch (IOException e1) {
        e1.printStackTrace();
            }
            String jsonTxt = null;
            try {
                jsonTxt = IOUtils.toString(is);
            } catch (IOException e) {
                e.printStackTrace();
            }

            JSONObject json = (JSONObject) JSONSerializer.toJSON(jsonTxt);

            JSONObject jdata = json.getJSONObject("data");

            JSONArray jentry = jdata.getJSONArray("items");
            for (int entryNumber = 0; entryNumber<=25; entryNumber++){
                    JSONObject entry = jentry.getJSONObject(entryNumber);
                    titlesList.add(entry.getString("title"));
            }

            return titlesList;
    }
    protected void onPostExecute(ArrayList<String> result) {
        ListView listView = (ListView)VideoPlay.this.findViewById(R.id.videolist);
        ArrayAdapter<String> adapter = new ArrayAdapter<String> (VideoPlay.this,
                android.R.layout.simple_list_item_1, android.R.id.text1, titlesList);
            (listView).setAdapter(adapter);
        }

    }
}

---

您有一个JSONException，但没有包含任何JSONException处理程序

---

是的，Android有自己的JSON库，尽管GSON附带了一个非常方便的序列化程序，如果你需要用很多键存储对象，它可以节省大量的编码时间

这里有你的问题的现有答案@Bostone我切换了库，但它仍然是强制关闭的。我将用新的LogCat输出更新我的问题。@Bostone实际上，由于JSONSerializer，输出大致相同，但它不在org.json中。。。。我该怎么办？

01-14 16:58:36.699: W/dalvikvm(11938): Unable to resolve superclass of Lnet/sf/json/JSONException; (1034)

01-14 16:58:36.707: W/dalvikvm(11938): Link of class 'Lnet/sf/json/JSONException;' failed

01-14 16:58:36.707: W/dalvikvm(11938): VFY: unable to resolve exception class 813 (Lnet/sf/json/JSONException;)

01-14 16:58:36.707: W/dalvikvm(11938): VFY: unable to find exception handler at addr 0x2e

01-14 16:58:36.707: W/dalvikvm(11938): VFY:  rejected Lnet/sf/json/JSONSerializer;.toJSON (Ljava/lang/Object;Lnet/sf/json/JsonConfig;)Lnet/sf/json/JSON;

01-14 16:58:36.707: W/dalvikvm(11938): VFY:  rejecting opcode 0x0d at 0x002e

01-14 16:58:36.707: W/dalvikvm(11938): VFY:  rejected Lnet/sf/json/JSONSerializer;.toJSON (Ljava/lang/Object;Lnet/sf/json/JsonConfig;)Lnet/sf/json/JSON;

01-14 16:58:36.707: W/dalvikvm(11938): Verifier rejected class Lnet/sf/json/JSONSerializer;

01-14 16:58:36.707: W/dalvikvm(11938): threadid=11: thread exiting with uncaught exception (group=0x41b28930)

01-14 16:58:36.707: E/AndroidRuntime(11938): FATAL EXCEPTION: AsyncTask #1

01-14 16:58:36.707: E/AndroidRuntime(11938): java.lang.RuntimeException: An error occured while executing doInBackground()

01-14 16:58:36.707: E/AndroidRuntime(11938):    at android.os.AsyncTask$3.done(AsyncTask.java:299)

01-14 16:58:36.707: E/AndroidRuntime(11938):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)

01-14 16:58:36.707: E/AndroidRuntime(11938):    at java.util.concurrent.FutureTask.setException(FutureTask.java:219)

01-14 16:58:36.707: E/AndroidRuntime(11938):    at java.util.concurrent.FutureTask.run(FutureTask.java:239)

01-14 16:58:36.707: E/AndroidRuntime(11938):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)

01-14 16:58:36.707: E/AndroidRuntime(11938):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)

01-14 16:58:36.707: E/AndroidRuntime(11938):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)

01-14 16:58:36.707: E/AndroidRuntime(11938):    at java.lang.Thread.run(Thread.java:856)

01-14 16:58:36.707: E/AndroidRuntime(11938): Caused by: java.lang.VerifyError: net/sf/json/JSONSerializer

01-14 16:58:36.707: E/AndroidRuntime(11938):    at com.aer.illbehonest.VideoPlay$ShowTitlesTask.doInBackground(VideoPlay.java:63)

01-14 16:58:36.707: E/AndroidRuntime(11938):    at com.aer.illbehonest.VideoPlay$ShowTitlesTask.doInBackground(VideoPlay.java:1)
01-14 16:58:36.707: E/AndroidRuntime(11938):    at android.os.AsyncTask$2.call(AsyncTask.java:287)

01-14 16:58:36.707: E/AndroidRuntime(11938):    at java.util.concurrent.FutureTask.run(FutureTask.java:234)

01-14 16:58:36.707: E/AndroidRuntime(11938):    ... 4 more