线程以未捕获的异常退出,AyncTask #2 致命错误
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【中文标题】线程以未捕获的异常退出,AyncTask #2 致命错误【英文标题】:Thread exiting with uncaught exception, AyncTask #2 Fatal Error 【发布时间】:2016-04-10 17:50:52 【问题描述】:我正在尝试制作一个 RSS 新闻阅读器应用程序,并且我正在使用 AsyncTask 来使用线程将新网站添加到 RSS 提要列表中。但是每当我输入新的 URL 并按“添加”时,应用程序就会崩溃。 LogCat 说 --
threadid 12:线程以未捕获的异常退出”、“AsyncTask #2 FATAL EXCEPTION”和 java.Lang.RuntimeException:执行 doInBackground() 时出错
请帮忙! (P.S. 我正在使用 ADT。)
package com.rssnews;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.lang.Exception;
public class AddNewFeed extends Activity
Button btnSubmit;
Button btnCancel;
EditText txtUrl;
TextView textViewMessage;
RSSParser rssParser = new RSSParser();
RSSFeed rssFeed;
private ProgressDialog pDialog;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.addnewfeed);
btnSubmit = (Button) findViewById(R.id.btnSubmit);
btnCancel = (Button) findViewById(R.id.btnCancel);
txtUrl = (EditText) findViewById(R.id.txtUrl);
textViewMessage = (TextView) findViewById(R.id.textViewMessage);
btnSubmit.setOnClickListener(new View.OnClickListener()
public void onClick(View v)
try
String url = txtUrl.getText().toString();
Log.d("URL Length", "" + url.length());
if (url.length() > 0)
textViewMessage.setText("");
String urlPattern = "^http(s0,1)://[a-zA-Z0-9_/\\-\\.]+\\.([A-Za-z/]2,5)[a-zA-Z0-9_/\\&\\?\\=\\-\\.\\~\\%]*";
if (url.matches(urlPattern))
new loadRSSFeed().execute(url);
else
textViewMessage.setText("Please enter a valid url");
else
textViewMessage.setText("Please enter website url");
catch(Exception e)
finish();
);
btnCancel.setOnClickListener(new View.OnClickListener()
public void onClick(View v)
finish();
);
/**
* Background Async Task to get RSS data from URL
* */
class loadRSSFeed extends AsyncTask<String, String, String>
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute()
super.onPreExecute();
pDialog = new ProgressDialog(AddNewFeed.this);
pDialog.setMessage("Fetching RSS Information ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
/**
* getting
* */
@Override
protected String doInBackground(String... args)
String url = args[0];
rssFeed = rssParser.getRSSFeed(url);
Log.d("rssFeed", " " + rssFeed);
if (rssFeed != null)
Log.e("RSS URL",
rssFeed.getTitle() + "" + rssFeed.getLink() + ""
+ rssFeed.getDescription() + ""
+ rssFeed.getLanguage());
RSSDatabaseHandler rssDb = new RSSDatabaseHandler(
getApplicationContext());
WebSite site = new WebSite(rssFeed.getTitle(),
rssFeed.getLink(), rssFeed.getRSSLink(),
rssFeed.getDescription());
rssDb.addSite(site);
Intent i = new Intent(getApplicationContext(),
RSSNewsReaderPBActivity.class);
// send result code 100 to notify about product update
setResult(100, i);
startActivity(i);
return null;
else
runOnUiThread(new Runnable()
public void run()
textViewMessage
.setText("Rss url not found. Please check the url or try again");
);
return null;
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String args)
pDialog.dismiss();
runOnUiThread(new Runnable()
public void run()
if (rssFeed != null)
);
@Override
protected void onPause()
super.onPause();
//pDialog.dismiss();
finish();
@Override
public void onBackPressed()
finish();
04-10 13:28:50.250: W/dalvikvm(1853): threadid=12: thread exiting with uncaught exception (group=0xb1a1bb90)
04-10 13:28:50.350: E/AndroidRuntime(1853): FATAL EXCEPTION: AsyncTask #2
04-10 13:28:50.350: E/AndroidRuntime(1853): Process: com.rssnews, PID: 1853
04-10 13:28:50.350: E/AndroidRuntime(1853): java.lang.RuntimeException: An error occured while executing doInBackground()
04-10 13:28:50.350: E/AndroidRuntime(1853): at android.os.AsyncTask$3.done(AsyncTask.java:300)
04-10 13:28:50.350: E/AndroidRuntime(1853): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
04-10 13:28:50.350: E/AndroidRuntime(1853): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
04-10 13:28:50.350: E/AndroidRuntime(1853): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
04-10 13:28:50.350: E/AndroidRuntime(1853): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
04-10 13:28:50.350: E/AndroidRuntime(1853): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
04-10 13:28:50.350: E/AndroidRuntime(1853): at java.lang.Thread.run(Thread.java:841)
04-10 13:28:50.350: E/AndroidRuntime(1853): Caused by: java.lang.NoClassDefFoundError: org.jsoup.Jsoup
04-10 13:28:50.350: E/AndroidRuntime(1853): at com.rssnews.RSSParser.getRSSLinkFromURL(RSSParser.java:129)
04-10 13:28:50.350: E/AndroidRuntime(1853): at com.rssnews.RSSParser.getRSSFeed(RSSParser.java:52)
04-10 13:28:50.350: E/AndroidRuntime(1853): at com.rssnews.AddNewFeed$loadRSSFeed.doInBackground(AddNewFeed.java:90)
04-10 13:28:50.350: E/AndroidRuntime(1853): at com.rssnews.AddNewFeed$loadRSSFeed.doInBackground(AddNewFeed.java:1)
04-10 13:28:50.350: E/AndroidRuntime(1853): at android.os.AsyncTask$2.call(AsyncTask.java:288)
04-10 13:28:50.350: E/AndroidRuntime(1853): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
04-10 13:28:50.350: E/AndroidRuntime(1853): ... 3 more
04-10 13:28:50.700: I/Choreographer(1853): Skipped 38 frames! The application may be doing too much work on its main thread.
04-10 13:28:51.880: I/Choreographer(1853): Skipped 95 frames! The application may be doing too much work on its main thread.
04-10 13:28:55.320: I/Choreographer(1853): Skipped 49 frames! The application may be doing too much work on its main thread.
04-10 13:28:56.280: I/Choreographer(1853): Skipped 96 frames! The application may be doing too much work on its main thread.
04-10 13:28:57.920: E/WindowManager(1853): android.view.WindowLeaked: Activity com.rssnews.AddNewFeed has leaked window com.android.internal.policy.impl.PhoneWindow$DecorViewb2524248 V.E..... R.....I. 0,0-563,230 that was originally added here
04-10 13:28:57.920: E/WindowManager(1853): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:346)
04-10 13:28:57.920: E/WindowManager(1853): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
04-10 13:28:57.920: E/WindowManager(1853): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
04-10 13:28:57.920: E/WindowManager(1853): at android.app.Dialog.show(Dialog.java:286)
04-10 13:28:57.920: E/WindowManager(1853): at com.rssnews.AddNewFeed$loadRSSFeed.onPreExecute(AddNewFeed.java:80)
04-10 13:28:57.920: E/WindowManager(1853): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
04-10 13:28:57.920: E/WindowManager(1853): at android.os.AsyncTask.execute(AsyncTask.java:535)
04-10 13:28:57.920: E/WindowManager(1853): at com.rssnews.AddNewFeed$1.onClick(AddNewFeed.java:45)
04-10 13:28:57.920: E/WindowManager(1853): at android.view.View.performClick(View.java:4424)
04-10 13:28:57.920: E/WindowManager(1853): at android.view.View$PerformClick.run(View.java:18383)
04-10 13:28:57.920: E/WindowManager(1853): at android.os.Handler.handleCallback(Handler.java:733)
04-10 13:28:57.920: E/WindowManager(1853): at android.os.Handler.dispatchMessage(Handler.java:95)
04-10 13:28:57.920: E/WindowManager(1853): at android.os.Looper.loop(Looper.java:137)
04-10 13:28:57.920: E/WindowManager(1853): at android.app.ActivityThread.main(ActivityThread.java:4998)
04-10 13:28:57.920: E/WindowManager(1853): at java.lang.reflect.Method.invokeNative(Native Method)
04-10 13:28:57.920: E/WindowManager(1853): at java.lang.reflect.Method.invoke(Method.java:515)
04-10 13:28:57.920: E/WindowManager(1853): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
04-10 13:28:57.920: E/WindowManager(1853): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
04-10 13:28:57.920: E/WindowManager(1853): at dalvik.system.NativeStart.main(Native Method)
04-10 13:28:57.980: I/Choreographer(1853): Skipped 62 frames! The application may be doing too much work on its main thread.
04-10 13:29:00.400: I/Process(1853): Sending signal. PID: 1853 SIG: 9
【问题讨论】:
你能试着清理一下你的问题吗? (您发布日志和输出很好,但格式使您很难阅读和理解您的问题。) 【参考方案1】:您正试图从后台线程(在doInBackground
方法中)启动一个活动,这就是您的应用程序崩溃的原因。您应该将该代码添加到onPostExecute
。
protected void onPostExecute(String args)
pDialog.dismiss();
Intent i = new Intent(getApplicationContext(), RSSNewsReaderPBActivity.class);
setResult(100, i);
startActivity(i);
【讨论】:
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