我正在尝试解析包含描述标记的XML，以便从中提取内容（摘要）。活动意外关闭/停止工作。 您可以访问URL中的链接并添加查询以查看我正在尝试解析的XML结果。
public class ResultActivity extends Activity{ //implements TextToSpeech.OnInitListener {
InputStream is = null;
private TextView textView;
XmlPullParserFactory pullParserFactory;
private static final String DEBUG_TAG = "HttpExample";
String query,result;
//private TextToSpeech tts;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, //Code for full screen activity
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_result);
Intent i = getIntent();
query = i.getStringExtra("query");
textView = (TextView) findViewById(R.id.mytext);
myClickHandler();
//speakout();
}
public void myClickHandler() {
query.replace(' ', '_');
String stringUrl = "http://lookup.dbpedia.org/api/search.asmx/KeywordSearch?QueryClass=place&QueryString="+query;
ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()) {
new DownloadWebpageTask().execute(stringUrl);
} else {
textView.setText("No network connection available.");
}
}
/*NEW subCLASS*/
class DownloadWebpageTask extends AsyncTask<String, Void, String> {
String ns=null;
@Override
protected String doInBackground(String... urls) {
// params comes from the execute() call: params[0] is the url.
try {
return downloadUrl(urls[0]);
} catch (IOException e) {
return "Unable to retrieve web page. URL may be invalid.";
}
}
private String downloadUrl(String myurl) throws IOException {
try {
URL url = new URL(myurl);
HttpURLConnection.setFollowRedirects(true);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
conn.setDoInput(true);
// Starts the query
conn.connect();
int response = conn.getResponseCode();
Log.d(DEBUG_TAG, "The response is: " + response);
is = conn.getInputStream();
pullParserFactory = XmlPullParserFactory.newInstance();
XmlPullParser parser = pullParserFactory.newPullParser();
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
parser.setInput(is, null);
// result=convertStreamToString(is);
result=parseXML(parser);
}
catch (XmlPullParserException e) {
e.printStackTrace();
} finally {
if (is != null) {
is.close();
}
}
return result;
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
textView.setText(result);
}
//FINAL TEXT VIEW WIDGET DISPLAY
private String parseXML(XmlPullParser parser) throws XmlPullParserException, IOException {
String res = null;
int eventType = parser.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT) {
String name = parser.getName();
if(eventType == XmlPullParser.START_DOCUMENT) {
System.out.println("Start document");
textView.setText("Reached");
} else if(eventType == XmlPullParser.END_DOCUMENT) {
System.out.println("End document");
}
else if(name.equals("description")) {
res=readSummary(parser);
}
eventType = parser.next();
}
return res;
}
//PARSE OUT THE DESCRIPTION TAG
private String readSummary(XmlPullParser parser) throws IOException, XmlPullParserException {
parser.require(XmlPullParser.START_TAG, ns, "description");
String summary = readText(parser);
parser.require(XmlPullParser.END_TAG, ns, "description");
return summary;
}
//PARSE OUT THE DESCRIPTION CONTENT FROM THE TAG
private String readText(XmlPullParser parser) throws IOException, XmlPullParserException {
String result = "";
if (parser.next() == XmlPullParser.TEXT) {
result = parser.getText();
parser.nextTag();
}
return result;
}
}
}
我的LOGCAT
06-19 19:47:08.344: E/Trace(662): error opening trace file: No such file or directory (2)
06-19 19:47:09.666: D/gralloc_goldfish(662): Emulator without GPU emulation detected.
06-19 19:49:32.676: D/HttpExample(662): The response is: 200
06-19 19:49:36.036: D/dalvikvm(662): GC_CONCURRENT freed 248K, 3% free 10985K/11271K, paused 79ms+40ms, total 289ms
06-19 19:53:21.125: D/gralloc_goldfish(716): Emulator without GPU emulation detected.
06-19 19:53:53.435: D/HttpExample(716): The response is: 200
06-19 19:53:53.465: I/System.out(716): Start document
06-19 19:53:53.475: W/dalvikvm(716): threadid=11: thread exiting with uncaught exception (group=0x40a13300)
06-19 19:53:53.535: E/AndroidRuntime(716): FATAL EXCEPTION: AsyncTask #1
06-19 19:53:53.535: E/AndroidRuntime(716): java.lang.RuntimeException: An error occured while executing doInBackground()
06-19 19:53:53.535: E/AndroidRuntime(716): at android.os.AsyncTask$3.done(AsyncTask.java:299)
06-19 19:53:53.535: E/AndroidRuntime(716): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
06-19 19:53:53.535: E/AndroidRuntime(716): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
06-19 19:53:53.535: E/AndroidRuntime(716): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
06-19 19:53:53.535: E/AndroidRuntime(716): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
06-19 19:53:53.535: E/AndroidRuntime(716): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
06-19 19:53:53.535: E/AndroidRuntime(716): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
06-19 19:53:53.535: E/AndroidRuntime(716): at java.lang.Thread.run(Thread.java:856)
06-19 19:53:53.535: E/AndroidRuntime(716): Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
06-19 19:53:53.535: E/AndroidRuntime(716): at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:4609)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.view.ViewRootImpl.requestLayout(ViewRootImpl.java:835)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.view.View.requestLayout(View.java:15129)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.view.View.requestLayout(View.java:15129)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.view.View.requestLayout(View.java:15129)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.view.View.requestLayout(View.java:15129)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.widget.RelativeLayout.requestLayout(RelativeLayout.java:292)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.view.View.requestLayout(View.java:15129)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.widget.TextView.checkForRelayout(TextView.java:6309)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.widget.TextView.setText(TextView.java:3547)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.widget.TextView.setText(TextView.java:3405)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.widget.TextView.setText(TextView.java:3380)
06-19 19:53:53.535: E/AndroidRuntime(716): at com.example.verch.ResultActivity$DownloadWebpageTask.parseXML(ResultActivity.java:150)
06-19 19:53:53.535: E/AndroidRuntime(716): at com.example.verch.ResultActivity$DownloadWebpageTask.downloadUrl(ResultActivity.java:122)
06-19 19:53:53.535: E/AndroidRuntime(716): at com.example.verch.ResultActivity$DownloadWebpageTask.doInBackground(ResultActivity.java:96)
06-19 19:53:53.535: E/AndroidRuntime(716): at com.example.verch.ResultActivity$DownloadWebpageTask.doInBackground(ResultActivity.java:1)
06-19 19:53:53.535: E/AndroidRuntime(716): at android.os.AsyncTask$2.call(AsyncTask.java:287)
06-19 19:53:53.535: E/AndroidRuntime(716): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
06-19 19:53:53.535: E/AndroidRuntime(716): ... 5 more
06-19 19:53:57.464: I/Process(716): Sending signal. PID: 716 SIG: 9
答案 0 :(得分：0)
试试这个：
parser.require(XmlPullParser.START_TAG, ns, "description");
String summary = parser.nextText();
parser.require(XmlPullParser.END_TAG, ns, "description");
答案 1 :(得分：0)
我不认为这是一个解析错误。 正如异常所说，除非是UI线程，否则无法处理线程内的视图。 在后台线程上运行的parseXML中，您尝试在视图上设置.Text。