首页 \ 问答 \ 具有多个标记解析错误的AsyncTask(AsyncTask with multiple tag parsing error)

具有多个标记解析错误的AsyncTask(AsyncTask with multiple tag parsing error)

 protected Void doInBackground(Void... params) {
        try {
            // Connect to the web site
            Document document = Jsoup.connect(url).get();
            // Using Elements to get the Meta data
            // Locate the content attribute
            Elements h3Tag = document.select("h3");

            desc1 = Integer.toString(h3Tag.size());
            if(Integer.parseInt(desc1)==1)
            {                
                Element description = document.getElementsByTag("table").get(3);
            }

 

 在上面的代码中，每当我添加该行 
 

 document.getElementByTag("table").get(3)); 
 

 该程序崩溃..但是，如果我删除h3tag选择它将工作正常..只有其中一个将工作，而不是两个..帮助？ 
 

 日志 
 

 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


 protected Void doInBackground(Void... params) {
        try {
            // Connect to the web site
            Document document = Jsoup.connect(url).get();
            // Using Elements to get the Meta data
            // Locate the content attribute
            Elements h3Tag = document.select("h3");

            desc1 = Integer.toString(h3Tag.size());
            if(Integer.parseInt(desc1)==1)
            {                
                Element description = document.getElementsByTag("table").get(3);
            }

 

In the above code, whenever i add the line 
 

document.getElementByTag("table").get(3));
 

The program crashes.. however if i remove the h3tag select it will work fine.. only one of them will work at a time not both..help?
 

log
 

 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


原文：
更新时间：2021-06-16 07:06

最满意答案

 我想你需要 
 

df <- within(df, V1 <- relevel(V1, ref="Yes"))

 

 因为relevel返回因子的相关值，但不会将其赋值给变量。 您正在评估 df的表达式，但不会将其分配给任何内容。 我可能会用 
 

df <- transform(df, V1 = relevel(V1, ref="Yes"))

 

 相反，但这是一种风格偏好（另见plyr / dplyr函数mutate ， dplyr ......） 
 

 如果（在评论中提到）你有一个名字向量（即一个字符向量），那么你就不能真正使用由transform共享的非标准评估范式， within subset （ dplyr ...）但是或多或少必须以老式的方式做事，例如 
 

df[vars.to.relevel] <- lapply(df[vars.to.relevel],relevel,ref="Yes")   


I think you need
 

df <- within(df, V1 <- relevel(V1, ref="Yes"))

 

because relevel returns the relevelled value of the factor but doesn't assign it to a variable. You're evaluating the expression within df, but not assigning it to anything. I would probably use
 

df <- transform(df, V1 = relevel(V1, ref="Yes"))

 

instead, but that's a stylistic preference (see also the plyr/dplyr functions mutate, transmute ...)
 

If (as asked in the comments) you have a vector of names (i.e. a character vector), then you can't really use the non-standard evaluation paradigm shared by transform, with, within, subset (dplyr ...) but more or less have to do things the old-fashioned way, e.g.
 

df[vars.to.relevel] <- lapply(df[vars.to.relevel],relevel,ref="Yes")

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