android - 从 XML 解析数据时出错

Question

我正在制作一个 android 应用程序，首先我将 XML 从网络保存到 sdcard 并成功保存，然后在尝试解析该 XML 但出现运行时错误后。我在下面添加了我的 LogCat。

这是我的代码，

protected String doInBackground(String... params) 
    {
        // TODO Auto-generated method stub

        try {               

            URL url = new URL(data);

            stringList=new ArrayList<String>();
            stringList1=new ArrayList<String>();

            //create the new connection

            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

            //set up some things on the connection

            urlConnection.setRequestMethod("GET");

            urlConnection.setDoOutput(true);

            //and connect!

            urlConnection.connect();

            //set the path where we want to save the file

            //in this case, going to save it on the root directory of the

            //sd card.

            File SDCardRoot = new File("/sdcard/");

            //create a new file, specifying the path, and the filename

            //which we want to save the file as.

            File file = new File(SDCardRoot,"hello.xml");

            //this will be used to write the downloaded data into the file we created

            FileOutputStream fileOutput = new FileOutputStream(file);

            //this will be used in reading the data from the internet

            InputStream inputStream = urlConnection.getInputStream();

            //this is the total size of the file

            int totalSize = urlConnection.getContentLength();

            //variable to store total downloaded bytes

            int downloadedSize = 0;

            //create a buffer...

            byte[] buffer = new byte[1024];

            int bufferLength = 0; //used to store a temporary size of the buffer

            //now, read through the input buffer and write the contents to the file

            while ( (bufferLength = inputStream.read(buffer)) > 0 ) 

            {

            //add the data in the buffer to the file in the file output stream (the file on the sd card

            fileOutput.write(buffer, 0, bufferLength);

            //add up the size so we know how much is downloaded

            downloadedSize += bufferLength;

            int progress=(int)(downloadedSize*100/totalSize);

            //this is where you would do something to report the prgress, like this maybe

            //updateProgress(downloadedSize, totalSize);

            }

            //close the output stream when done

            fileOutput.close();

            InputStream is = new FileInputStream(file.getPath());
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            Document doc = db.parse(new InputSource(is));
            doc.getDocumentElement().normalize();

            NodeList nodeList = doc.getElementsByTagName("Table");

            for (int i = 0; i < nodeList.getLength(); i++) 
            {
                Node node = nodeList.item(i);       

                Element fstElmnt = (Element) node;
                NodeList nameList = fstElmnt.getElementsByTagName("State");
                Element nameElement = (Element) nameList.item(0);
                nameList = nameElement.getChildNodes();
                state=((Node) nameList.item(0)).getNodeValue();

                Element fstElmnt1 = (Element) node;
                NodeList nameList1 = fstElmnt1.getElementsByTagName("District");
                Element nameElement1 = (Element) nameList1.item(0);
                nameList1 = nameElement1.getChildNodes();
                district=((Node) nameList1.item(0)).getNodeValue();

                if(!stringList.contains(state) && !stringList1.contains(district))
                {
                    stringList.add(state);
                    stringList1.add(district);
                    DatabaseHandler mydb = new DatabaseHandler(getApplicationContext());
                    // inserting new label into database
                    mydb.insertData(state,district);
                    //mydb.close();
                }
                //System.out.println("State : "+((Node) nameList.item(0)).getNodeValue());
           }

            loadStateSpinnerData();
            loadDistrictSpinnerData();

        } 
        catch (MalformedURLException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
            Toast.makeText(getBaseContext(), "No Internet Connection!", Toast.LENGTH_LONG).show();
        } 
        catch (ParserConfigurationException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 
        catch (SAXException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 
        catch (IOException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return null;
    }

还有我的 LogCat，

10-23 13:02:49.059: E/AndroidRuntime(8678): FATAL EXCEPTION: AsyncTask #1
10-23 13:02:49.059: E/AndroidRuntime(8678): java.lang.RuntimeException: An error occured while executing doInBackground()
10-23 13:02:49.059: E/AndroidRuntime(8678):     at android.os.AsyncTask$3.done(AsyncTask.java:200)
10-23 13:02:49.059: E/AndroidRuntime(8678):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
10-23 13:02:49.059: E/AndroidRuntime(8678):     at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
10-23 13:02:49.059: E/AndroidRuntime(8678):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
10-23 13:02:49.059: E/AndroidRuntime(8678):     at java.util.concurrent.FutureTask.run(FutureTask.java:138)
10-23 13:02:49.059: E/AndroidRuntime(8678):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
10-23 13:02:49.059: E/AndroidRuntime(8678):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
10-23 13:02:49.059: E/AndroidRuntime(8678):     at java.lang.Thread.run(Thread.java:1019)
10-23 13:02:49.059: E/AndroidRuntime(8678): Caused by: java.lang.ClassCastException: org.apache.harmony.xml.dom.TextImpl
10-23 13:02:49.059: E/AndroidRuntime(8678):     at com.example.androidspinnerfromsqlite.AndroidSpinnerFromSQLiteActivity$XmlParsing.doInBackground(AndroidSpinnerFromSQLiteActivity.java:190)
10-23 13:02:49.059: E/AndroidRuntime(8678):     at com.example.androidspinnerfromsqlite.AndroidSpinnerFromSQLiteActivity$XmlParsing.doInBackground(AndroidSpinnerFromSQLiteActivity.java:1)
10-23 13:02:49.059: E/AndroidRuntime(8678):     at android.os.AsyncTask$2.call(AsyncTask.java:185)
10-23 13:02:49.059: E/AndroidRuntime(8678):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
10-23 13:02:49.059: E/AndroidRuntime(8678):     ... 4 more
10-23 13:02:56.189: E/WindowManager(8678): Activity com.example.androidspinnerfromsqlite.AndroidSpinnerFromSQLiteActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@405233a8 that was originally added here
10-23 13:02:56.189: E/WindowManager(8678): android.view.WindowLeaked: Activity com.example.androidspinnerfromsqlite.AndroidSpinnerFromSQLiteActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@405233a8 that was originally added here
10-23 13:02:56.189: E/WindowManager(8678):  at android.view.ViewRoot.<init>(ViewRoot.java:263)
10-23 13:02:56.189: E/WindowManager(8678):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
10-23 13:02:56.189: E/WindowManager(8678):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
10-23 13:02:56.189: E/WindowManager(8678):  at android.view.Window$LocalWindowManager.addView(Window.java:424)
10-23 13:02:56.189: E/WindowManager(8678):  at android.app.Dialog.show(Dialog.java:241)
10-23 13:02:56.189: E/WindowManager(8678):  at android.app.ProgressDialog.show(ProgressDialog.java:107)
10-23 13:02:56.189: E/WindowManager(8678):  at android.app.ProgressDialog.show(ProgressDialog.java:90)
10-23 13:02:56.189: E/WindowManager(8678):  at com.example.androidspinnerfromsqlite.AndroidSpinnerFromSQLiteActivity$XmlParsing.onPreExecute(AndroidSpinnerFromSQLiteActivity.java:78)
10-23 13:02:56.189: E/WindowManager(8678):  at android.os.AsyncTask.execute(AsyncTask.java:391)
10-23 13:02:56.189: E/WindowManager(8678):  at com.example.androidspinnerfromsqlite.AndroidSpinnerFromSQLiteActivity.onCreate(AndroidSpinnerFromSQLiteActivity.java:57)
10-23 13:02:56.189: E/WindowManager(8678):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
10-23 13:02:56.189: E/WindowManager(8678):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
10-23 13:02:56.189: E/WindowManager(8678):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
10-23 13:02:56.189: E/WindowManager(8678):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
10-23 13:02:56.189: E/WindowManager(8678):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
10-23 13:02:56.189: E/WindowManager(8678):  at android.os.Handler.dispatchMessage(Handler.java:99)
10-23 13:02:56.189: E/WindowManager(8678):  at android.os.Looper.loop(Looper.java:130)
10-23 13:02:56.189: E/WindowManager(8678):  at android.app.ActivityThread.main(ActivityThread.java:3687)
10-23 13:02:56.189: E/WindowManager(8678):  at java.lang.reflect.Method.invokeNative(Native Method)
10-23 13:02:56.189: E/WindowManager(8678):  at java.lang.reflect.Method.invoke(Method.java:507)
10-23 13:02:56.189: E/WindowManager(8678):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
10-23 13:02:56.189: E/WindowManager(8678):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
10-23 13:02:56.189: E/WindowManager(8678):  at dalvik.system.NativeStart.main(Native Method)

不知道到底哪里出错了。

请帮忙。

谢谢。

Answer 1

试试这个:

runOnUiThread(new Runnable() {

                        @Override
                        public void run() {
                            // TODO Auto-generated method stub
                            loadStateSpinnerData();
                            loadDistrictSpinnerData();
                        }
                    });

改变这个:

if(!stringList.contains(state) && !stringList1.contains(district))
                {
                    stringList.add(state);
                    stringList1.add(district);
                    DatabaseHandler mydb = new DatabaseHandler(getApplicationContext());
                    // inserting new label into database
                    mydb.insertData(state,district);
                    //mydb.close();
                }

到

if(!stringList.contains(state) || !stringList1.contains(district))
                {
                    stringList.add(state);
                    stringList1.add(district);
                    DatabaseHandler mydb = new DatabaseHandler(getApplicationContext());
                    // inserting new label into database
                    mydb.insertData(state,district);
                    //mydb.close();
                }