Android 具有多标记分析错误的异步任务

在上面的代码中，每当我添加行

document.getElementByTag（“表”）.get（3））

程序崩溃了。。但是，如果我删除h3tag select，它将正常工作。。一次只能有一个，不是两个都能帮上忙吗

日志

01-12 16:33:26.314:E/AndroidRuntime（966）：在android.os.AsyncTask$3.done（AsyncTask.java:299）
01-12 16:33:26.314:E/AndroidRuntime（966）：在java.util.concurrent.FutureTask.finishCompletion（FutureTask.java:352）
01-12 16:33:26.314:E/AndroidRuntime（966）：在java.util.concurrent.FutureTask.setException（FutureTask.java:219）
01-12 16:33:26.314:E/AndroidRuntime（966）：在java.util.concurrent.FutureTask.run（FutureTask.java:239）
01-12 16:33:26.314:E/AndroidRuntime（966）：在android.os.AsyncTask$SerialExecutor$1.run（AsyncTask.java:230）
01-12 16:33:26.314:E/AndroidRuntime（966）：位于java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1080）
01-12 16:33:26.314:E/AndroidRuntime（966）：在java.util.concurrent.ThreadPoolExecutor$Worker.run（ThreadPoolExecutor.java:573）
01-12 16:33:26.314:E/AndroidRuntime（966）：在java.lang.Thread.run（Thread.java:856）处
01-12 16:33:26.314:E/AndroidRuntime（966）：由以下原因引起：java.lang.IndexOutOfBoundsException:索引3无效，大小为3
01-12 16:33:26.314:E/AndroidRuntime（966）：位于java.util.ArrayList.throwIndexOutOfBoundsException（ArrayList.java:251）
01-12 16:33:26.314:E/AndroidRuntime（966）：在java.util.ArrayList.get（ArrayList.java:304）
01-12 16:33:26.314:E/AndroidRuntime（966）：位于org.jsoup.select.Elements.get（Elements.java:501）
01-12 16:33:26.314:E/AndroidRuntime（966）：在com.example.scrasting.MainActivity$Description.doInBackground（MainActivity.java:132）
01-12 16:33:26.314:E/AndroidRuntime（966）：在com.example.scrasting.MainActivity$Description.doInBackground（MainActivity.java:1）
01-12 16:33:26.314:E/AndroidRuntime（966）：在android.os.AsyncTask$2.call（AsyncTask.java:287）
01-12 16:33:26.314:E/AndroidRuntime（966）：在java.util.concurrent.FutureTask.run（FutureTask.java:234）
01-12 16:33:26.314:E/AndroidRuntime（966）：。。。4更多
01-12 16:33:29.355:E/WindowManager（966）：Activity com.example.scraping.main活动泄漏了最初添加到此处的window com.android.internal.policy.impl.PhoneWindow$DecorView{40d42af0 V.E…..R…d0,0-772216}
01-12 16:33:29.355:E/WindowManager（966）：android.view.WindowLeaked:Activity com.example.scrasting.main活动泄漏了window com.android.internal.policy.impl.PhoneWindow$DecorView{40d42af0 V.E…..R…..D 0,0-772216}，最初添加到这里
01-12 16:33:29.355:E/WindowManager（966）：在android.view.ViewRootImpl。（ViewRootImpl.java:354）
01-12 16:33:29.355:E/WindowManager（966）：在android.view.WindowManagerGlobal.addView（WindowManagerGlobal.java:216）
01-12 16:33:29.355:E/WindowManager（966）：在android.view.WindowManagerImpl.addView（WindowManagerImpl.java:69）
01-12 16:33:29.355:E/WindowManager（966）：在android.app.Dialog.show（Dialog.java:281）
01-12 16:33:29.355:E/WindowManager（966）：位于com.example.scraping.MainActivity$Description.onPreExecute（MainActivity.java:116）
01-12 16:33:29.355:E/WindowManager（966）：位于android.os.AsyncTask.executeOnExecutor（AsyncTask.java:586）
01-12 16:33:29.355:E/WindowManager（966）：在android.os.AsyncTask.execute（AsyncTask.java:534）
01-12 16:33:29.355:E/WindowManager（966）：在com.example.scrasting.MainActivity$2.onClick（MainActivity.java:55）
01-12 16:33:29.355:E/WindowManager（966）：在android.view.view.performClick（view.java:4204）上
01-12 16:33:29.355:E/WindowManager（966）：在android.view.view$PerformClick.run（view.java:17355）
01-12 16:33:29.355:E/WindowManager（966）：在android.os.Handler.handleCallback（Handler.java:725）上
01-12 16:33:29.355:E/WindowManager（966）：在android.os.Handler.dispatchMessage（Handler.java:92）上
01-12 16:33:29.355:E/WindowManager（966）：在android.os.Looper.loop（Looper.java:137）
01-12 16:33:29.355:E/WindowManager（966）：位于android.app.ActivityThread.main（ActivityThread.java:5041）
01-12 16:33:29.355:E/WindowManager（966）：位于java.lang.reflect.Method.Invokenactive（本机方法）
01-12 16:33:29.355:E/WindowManager（966）：位于java.lang.reflect.Method.invoke（Method.java:511）
01-12 16:33:29.355:E/WindowManager（966）：位于com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:793）
01-12 16:33:29.355:E/WindowManager（966）：位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:560）
01-12 16:33:29.355:E/WindowManager（966）：在dalvik.system.NativeStart.main（本机方法）
01-12 16:33:31.285:I/进程（966）：发送信号。PID:966信号：9
您使用的索引不正确。。请尝试1或2，因为存在以下异常：

 01-12 16:33:26.314: E/AndroidRuntime(966):     at android.os.AsyncTask$3.done(AsyncTask.java:299)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.concurrent.FutureTask.run(FutureTask.java:239)
01-12 16:33:26.314: E/AndroidRuntime(966):  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.lang.Thread.run(Thread.java:856)
01-12 16:33:26.314: E/AndroidRuntime(966): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 3, size is 3
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.ArrayList.get(ArrayList.java:304)
01-12 16:33:26.314: E/AndroidRuntime(966):  at org.jsoup.select.Elements.get(Elements.java:501)
01-12 16:33:26.314: E/AndroidRuntime(966):  at com.example.scrapping.MainActivity$Description.doInBackground(MainActivity.java:132)
01-12 16:33:26.314: E/AndroidRuntime(966):  at com.example.scrapping.MainActivity$Description.doInBackground(MainActivity.java:1)
01-12 16:33:26.314: E/AndroidRuntime(966):  at android.os.AsyncTask$2.call(AsyncTask.java:287)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.concurrent.FutureTask.run(FutureTask.java:234)
01-12 16:33:26.314: E/AndroidRuntime(966):  ... 4 more
01-12 16:33:29.355: E/WindowManager(966): Activity com.example.scrapping.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d42af0 V.E..... R......D 0,0-772,216} that was originally added here
01-12 16:33:29.355: E/WindowManager(966): android.view.WindowLeaked: Activity com.example.scrapping.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d42af0 V.E..... R......D 0,0-772,216} that was originally added here
01-12 16:33:29.355: E/WindowManager(966):   at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
01-12 16:33:29.355: E/WindowManager(966):   at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
01-12 16:33:29.355: E/WindowManager(966):   at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
01-12 16:33:29.355: E/WindowManager(966):   at android.app.Dialog.show(Dialog.java:281)
01-12 16:33:29.355: E/WindowManager(966):   at com.example.scrapping.MainActivity$Description.onPreExecute(MainActivity.java:116)
01-12 16:33:29.355: E/WindowManager(966):   at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
01-12 16:33:29.355: E/WindowManager(966):   at android.os.AsyncTask.execute(AsyncTask.java:534)
01-12 16:33:29.355: E/WindowManager(966):   at com.example.scrapping.MainActivity$2.onClick(MainActivity.java:55)
01-12 16:33:29.355: E/WindowManager(966):   at android.view.View.performClick(View.java:4204)
01-12 16:33:29.355: E/WindowManager(966):   at android.view.View$PerformClick.run(View.java:17355)
01-12 16:33:29.355: E/WindowManager(966):   at android.os.Handler.handleCallback(Handler.java:725)
01-12 16:33:29.355: E/WindowManager(966):   at android.os.Handler.dispatchMessage(Handler.java:92)
01-12 16:33:29.355: E/WindowManager(966):   at android.os.Looper.loop(Looper.java:137)
01-12 16:33:29.355: E/WindowManager(966):   at android.app.ActivityThread.main(ActivityThread.java:5041)
01-12 16:33:29.355: E/WindowManager(966):   at java.lang.reflect.Method.invokeNative(Native Method)
01-12 16:33:29.355: E/WindowManager(966):   at java.lang.reflect.Method.invoke(Method.java:511)
01-12 16:33:29.355: E/WindowManager(966):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-12 16:33:29.355: E/WindowManager(966):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-12 16:33:29.355: E/WindowManager(966):   at dalvik.system.NativeStart.main(Native Method)
01-12 16:33:31.285: I/Process(966): Sending signal. PID: 966 SIG: 9

我想你现在已经明白了这一点，但我会发布一个解释，以供将来参考：

错误是由以下行（特别是
get（3）
部分）引起的：

根据日志输出，
description
的大小为3。也就是说，您正在解析的HTML文档中只存在3个
元素。请记住，索引编号从零开始，3是无效的索引。也就是说，对于大小为3的ArrayList，只有0、1和2是有效索引

删除
Elements h3Tag=document时代码工作的原因。选择（“h3”）行是因为如果没有它，if语句的条件将不满足，因此它不会在中运行代码。
原因：java.lang.IndexOutOfBoundsException:无效索引3，大小为3。索引从0开始，大小为3，表示其0、1和2。您正在访问索引3hey…谢谢您。。使用了错误的条件..:）！请考虑一下解释一下答案。
 01-12 16:33:26.314: E/AndroidRuntime(966):     at android.os.AsyncTask$3.done(AsyncTask.java:299)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.concurrent.FutureTask.run(FutureTask.java:239)
01-12 16:33:26.314: E/AndroidRuntime(966):  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.lang.Thread.run(Thread.java:856)
01-12 16:33:26.314: E/AndroidRuntime(966): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 3, size is 3
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.ArrayList.get(ArrayList.java:304)
01-12 16:33:26.314: E/AndroidRuntime(966):  at org.jsoup.select.Elements.get(Elements.java:501)
01-12 16:33:26.314: E/AndroidRuntime(966):  at com.example.scrapping.MainActivity$Description.doInBackground(MainActivity.java:132)
01-12 16:33:26.314: E/AndroidRuntime(966):  at com.example.scrapping.MainActivity$Description.doInBackground(MainActivity.java:1)
01-12 16:33:26.314: E/AndroidRuntime(966):  at android.os.AsyncTask$2.call(AsyncTask.java:287)
01-12 16:33:26.314: E/AndroidRuntime(966):  at java.util.concurrent.FutureTask.run(FutureTask.java:234)
01-12 16:33:26.314: E/AndroidRuntime(966):  ... 4 more
01-12 16:33:29.355: E/WindowManager(966): Activity com.example.scrapping.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d42af0 V.E..... R......D 0,0-772,216} that was originally added here
01-12 16:33:29.355: E/WindowManager(966): android.view.WindowLeaked: Activity com.example.scrapping.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d42af0 V.E..... R......D 0,0-772,216} that was originally added here
01-12 16:33:29.355: E/WindowManager(966):   at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
01-12 16:33:29.355: E/WindowManager(966):   at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
01-12 16:33:29.355: E/WindowManager(966):   at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
01-12 16:33:29.355: E/WindowManager(966):   at android.app.Dialog.show(Dialog.java:281)
01-12 16:33:29.355: E/WindowManager(966):   at com.example.scrapping.MainActivity$Description.onPreExecute(MainActivity.java:116)
01-12 16:33:29.355: E/WindowManager(966):   at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
01-12 16:33:29.355: E/WindowManager(966):   at android.os.AsyncTask.execute(AsyncTask.java:534)
01-12 16:33:29.355: E/WindowManager(966):   at com.example.scrapping.MainActivity$2.onClick(MainActivity.java:55)
01-12 16:33:29.355: E/WindowManager(966):   at android.view.View.performClick(View.java:4204)
01-12 16:33:29.355: E/WindowManager(966):   at android.view.View$PerformClick.run(View.java:17355)
01-12 16:33:29.355: E/WindowManager(966):   at android.os.Handler.handleCallback(Handler.java:725)
01-12 16:33:29.355: E/WindowManager(966):   at android.os.Handler.dispatchMessage(Handler.java:92)
01-12 16:33:29.355: E/WindowManager(966):   at android.os.Looper.loop(Looper.java:137)
01-12 16:33:29.355: E/WindowManager(966):   at android.app.ActivityThread.main(ActivityThread.java:5041)
01-12 16:33:29.355: E/WindowManager(966):   at java.lang.reflect.Method.invokeNative(Native Method)
01-12 16:33:29.355: E/WindowManager(966):   at java.lang.reflect.Method.invoke(Method.java:511)
01-12 16:33:29.355: E/WindowManager(966):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-12 16:33:29.355: E/WindowManager(966):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-12 16:33:29.355: E/WindowManager(966):   at dalvik.system.NativeStart.main(Native Method)
01-12 16:33:31.285: I/Process(966): Sending signal. PID: 966 SIG: 9

01-12 16:33:26.314: E/AndroidRuntime(966): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 3, size is 3

Element description = document.getElementsByTag("table").get(3);