Question

所以，我的Html_parser.java文件中有以下行，这会导致运行时错误：

import java.io.*;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

public  class Html_parser {
    public static String[] getdata(String site) throws IOException {
        String[] data = new String [1];
        for (int i = 0; i < data.length; i++){
            data[i] = "";   //Initializing the array
        }
        try {
            // Connect to the web site
            Document doc = Jsoup.connect(site).get(); //CRASHES HERE

        } catch (IOException e) {
            e.printStackTrace();
        }
        return data;
    }
}

错误的第一行： java.lang.RuntimeException：无法启动活动ComponentInfo {com.asd.mordorviewer / com.asd.mordorviewer.MainActivity}：android.os.NetworkOnMainThreadException

如果我发表评论＆＃34; CRASHES HERE＆＃34;行，然后应用程序运行没有错误。

我有文件root / libs / jsoup-1.7.3.jar，它是在java构建路径中导入的。

我不明白这里有什么问题。

EDIT1 ：我已经从准备好的简短示例代码中完成了复制粘贴，虽然该代码在给定项目中正确运行，但在我的项目中会导致运行时错误。

EDIT2 ：我使用的示例代码是针对API级别18，现在是：

public class MainActivity extends Activity {

    // URL Address
    String url = "http://www.stackoverflow.com";
    ProgressDialog mProgressDialog;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new Title().execute();
    }

    // Title AsyncTask
    private class Title extends AsyncTask<Void, Void, Void> {
        String title;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            mProgressDialog = new ProgressDialog(MainActivity.this);
            mProgressDialog.setTitle("Android Basic JSoup Tutorial");
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setIndeterminate(false);
            mProgressDialog.show();
        }

        @Override
        protected Void doInBackground(Void... params) {
            try {
                // Connect to the web site
                Document document = Jsoup.connect(url).get();
                // Get the html document title
                title = document.title();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            // Set title into TextView
            TextView txttitle = (TextView) findViewById(R.id.titletxt);
            txttitle.setText(title);
            mProgressDialog.dismiss();
        }
    }
}

EDIT3 ：我重新启动了Eclipse并创建了一个新项目，试图复制源项目的每个属性，但仍然没有。

EDIT4

08-16 22:14:03.096: W/dalvikvm(28383): threadid=11: thread exiting with uncaught exception (group=0x415d18b0)
08-16 22:14:03.126: E/AndroidRuntime(28383): FATAL EXCEPTION: AsyncTask #1
08-16 22:14:03.126: E/AndroidRuntime(28383): java.lang.RuntimeException: An error occured while executing doInBackground()
08-16 22:14:03.126: E/AndroidRuntime(28383):    at android.os.AsyncTask$3.done(AsyncTask.java:299)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at java.util.concurrent.FutureTask.run(FutureTask.java:239)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at java.lang.Thread.run(Thread.java:841)
08-16 22:14:03.126: E/AndroidRuntime(28383): Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at java.net.InetAddress.lookupHostByName(InetAddress.java:418)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at java.net.InetAddress.getAllByName(InetAddress.java:214)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:425)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:410)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:164)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at org.jsoup.helper.HttpConnection.get(HttpConnection.java:153)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at com.asd.mordorviewer.MainActivity$Title.doInBackground(MainActivity.java:50)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at com.asd.mordorviewer.MainActivity$Title.doInBackground(MainActivity.java:1)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at java.util.concurrent.FutureTask.run(FutureTask.java:234)
08-16 22:14:03.126: E/AndroidRuntime(28383):    ... 4 more
08-16 22:14:03.126: E/AndroidRuntime(28383): Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated with hostname)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at libcore.io.Posix.getaddrinfo(Native Method)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at libcore.io.ForwardingOs.getaddrinfo(ForwardingOs.java:61)
08-16 22:14:03.126: E/AndroidRuntime(28383):    at java.net.InetAddress.lookupHostByName(InetAddress.java:405)
08-16 22:14:03.126: E/AndroidRuntime(28383):    ... 24 more
08-16 22:14:03.126: E/AndroidRuntime(28383): Caused by: libcore.io.ErrnoException: getaddrinfo failed: EACCES (Permission denied)
08-16 22:14:03.126: E/AndroidRuntime(28383):    ... 27 more
08-16 22:14:03.416: E/WindowManager(28383): Activity com.asd.mordorviewer.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{418ba2e8 V.E..... R....... 0,0-684,324} that was originally added here
08-16 22:14:03.416: E/WindowManager(28383): android.view.WindowLeaked: Activity com.asd.mordorviewer.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{418ba2e8 V.E..... R....... 0,0-684,324} that was originally added here
08-16 22:14:03.416: E/WindowManager(28383):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:350)
08-16 22:14:03.416: E/WindowManager(28383):     at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:239)
08-16 22:14:03.416: E/WindowManager(28383):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
08-16 22:14:03.416: E/WindowManager(28383):     at android.app.Dialog.show(Dialog.java:289)
08-16 22:14:03.416: E/WindowManager(28383):     at com.asd.mordorviewer.MainActivity$Title.onPreExecute(MainActivity.java:43)
08-16 22:14:03.416: E/WindowManager(28383):     at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
08-16 22:14:03.416: E/WindowManager(28383):     at android.os.AsyncTask.execute(AsyncTask.java:534)
08-16 22:14:03.416: E/WindowManager(28383):     at com.asd.mordorviewer.MainActivity.onCreate(MainActivity.java:29)
08-16 22:14:03.416: E/WindowManager(28383):     at android.app.Activity.performCreate(Activity.java:5133)
08-16 22:14:03.416: E/WindowManager(28383):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
08-16 22:14:03.416: E/WindowManager(28383):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2230)
08-16 22:14:03.416: E/WindowManager(28383):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2316)
08-16 22:14:03.416: E/WindowManager(28383):     at android.app.ActivityThread.access$600(ActivityThread.java:150)
08-16 22:14:03.416: E/WindowManager(28383):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1298)
08-16 22:14:03.416: E/WindowManager(28383):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-16 22:14:03.416: E/WindowManager(28383):     at android.os.Looper.loop(Looper.java:213)
08-16 22:14:03.416: E/WindowManager(28383):     at android.app.ActivityThread.main(ActivityThread.java:5225)
08-16 22:14:03.416: E/WindowManager(28383):     at java.lang.reflect.Method.invokeNative(Native Method)
08-16 22:14:03.416: E/WindowManager(28383):     at java.lang.reflect.Method.invoke(Method.java:525)
08-16 22:14:03.416: E/WindowManager(28383):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:741)
08-16 22:14:03.416: E/WindowManager(28383):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
08-16 22:14:03.416: E/WindowManager(28383):     at dalvik.system.NativeStart.main(Native Method)

错误输出。

Answer 1

在AndroidManifest.xml文件中，必须添加以下行：

<uses-permission android:name="android.permission.INTERNET" />

似乎我在jsoup设置中看得太多而忘记了显而易见的事情。

Answer 2

问题是您正在尝试在主线程上执行网络操作 - 这在API 11及更高版本中是不允许的。

来自documentation：

当应用程序尝试在其主线程上执行网络操作时引发的异常。

您提到的另一个项目可能针对的是低于11的API版本。

在后台任务中进行网络处理，例如AsyncTask。

Android运行时错误 - jsoup设置

2 个答案: