java应用程序仅适用于第一个输入，如果插入第二个输入，则会崩溃
该应用程序按预期工作。输入股票符号，按下enter按钮，数据从yahoo webservice中提取并显示在屏幕上。但是，在显示第一个股票符号后，如果输入新的股票符号，应用程序将崩溃
主要活动。爪哇
package com.example.quickstockinfo;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import 安卓.app.Activity;
import 安卓.app.AlertDialog;
import 安卓.content.Context;
import 安卓.content.Intent;
import 安卓.os.AsyncTask;
import 安卓.os.Bundle;
import 安卓.util.Log;
import 安卓.view.Menu;
import 安卓.view.MenuItem;
import 安卓.view.View;
import 安卓.view.View.OnClickListener;
import 安卓.view.inputmethod.InputMethodManager;
import 安卓.widget.Button;
import 安卓.widget.EditText;
import 安卓.widget.TableRow;
import 安卓.widget.TextView;
public class MainActivity extends Activity {
EditText stocksymbol;
String stocksymbolstring;
Button enterbutton;
TextView CompanyName;
TextView YearLow;
TextView YearHigh;
TextView DaysLow;
TextView DaysHigh;
TextView LastPrice;
TextView Change;
TextView DailyPriceRange;
// XML node keys
static final String KEY_ITEM = "quote"; // parent node
static final String KEY_NAME = "Name";
static final String KEY_YEAR_LOW = "YearLow";
static final String KEY_YEAR_HIGH = "YearHigh";
static final String KEY_DAYS_LOW = "DaysLow";
static final String KEY_DAYS_HIGH = "DaysHigh";
static final String KEY_LAST_TRADE_PRICE = "LastTradePriceOnly";
static final String KEY_CHANGE = "Change";
static final String KEY_DAYS_RANGE = "DaysRange";
// XML Data to Retrieve
String name = "";
String yearLow = "";
String yearHigh = "";
String daysLow = "";
String daysHigh = "";
String lastTradePriceOnly = "";
String change = "";
String daysRange = "";
// Used to make the URL to call for XML data
String yahooURLFirst = "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.quote%20where%20symbol%20in%20(%22";
String yahooURLSecond = "%22)&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
// NEW STUFF
// Holds values pulled from the XML document using XmlPullParser
String[][] xmlPullParserArray = {{"AverageDailyVolume", "0"}, {"Change", "0"}, {"DaysLow", "0"},
{"DaysHigh", "0"}, {"YearLow", "0"}, {"YearHigh", "0"},
{"MarketCapitalization", "0"}, {"LastTradePriceOnly", "0"}, {"DaysRange", "0"},
{"Name", "0"}, {"Symbol", "0"}, {"Volume", "0"},
{"StockExchange", "0"}};
int parserArrayIncrement = 0;
// END OF NEW STUFF
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
stocksymbol = (EditText)findViewById(R.id.stocksymbol);
enterbutton = (Button)findViewById(R.id.enterbutton);
CompanyName = (TextView)findViewById(R.id.stockName);
YearLow = (TextView)findViewById(R.id.YearLow);
YearHigh = (TextView)findViewById(R.id.YearHigh);
DaysLow = (TextView)findViewById(R.id.DaysLow);
DaysHigh = (TextView)findViewById(R.id.DaysHigh);
LastPrice = (TextView)findViewById(R.id.LastPrice);
Change = (TextView)findViewById(R.id.Change);
DailyPriceRange = (TextView)findViewById(R.id.DailyPriceRange);
enterbutton.setOnClickListener(enterbuttonlistener);
}
public OnClickListener enterbuttonlistener = new OnClickListener(){
public void onClick(View v) {
if(stocksymbol.getText().length() > 0){
stocksymbolstring = stocksymbol.getText().toString();
stocksymbol.setText(""); // Clear EditText box
// Force the keyboard to close
InputMethodManager imm = (InputMethodManager)getSystemService(
Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(stocksymbol.getWindowToken(), 0);
} else {
// Create an alert dialog box
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
// Set alert title
builder.setTitle("invalid stock symbol");
// Set the value for the positive reaction from the user
// You can also set a listener to call when it is pressed
builder.setPositiveButton("ok", null);
// The message
builder.setMessage("missing stock symbol");
// Create the alert dialog and display it
AlertDialog theAlertDialog = builder.create();
theAlertDialog.show();
}// end else
// Create the YQL query
final String yqlURL = yahooURLFirst + stocksymbolstring + yahooURLSecond;
new MyAsyncTask().execute(yqlURL);
} //end onClick view v
}; //end button click event
private class MyAsyncTask extends AsyncTask<String, String, String>{
// String... arg0 is the same as String[] args
protected String doInBackground(String... args) {
// NEW STUFF
try{
Log.d("test","In XmlPullParser");
// It is recommended to use the XmlPullParser because
// it is faster and requires less memory then the DOM API
// XmlPullParserFactory provides you with the ability to
// create pull parsers that parse XML documents
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
// Parser supports XML namespaces
factory.setNamespaceAware(true);
// Provides the methods needed to parse XML documents
XmlPullParser parser = factory.newPullParser();
// InputStreamReader converts bytes of data into a stream
// of characters
parser.setInput(new InputStreamReader(getUrlData(args[0])));
// Passes the parser and the first tag in the XML document
// for processing
beginDocument(parser,"query");
// Get the currently targeted event type, which starts
// as START_DOCUMENT
int eventType = parser.getEventType();
do{
// Cycles through elements in the XML document while
// neither a start or end tag are found
nextElement(parser);
// Switch to the next element
parser.next();
// Get the current event type
eventType = parser.getEventType();
// Check if a value was found between 2 tags
if(eventType == XmlPullParser.TEXT){
// Get the text from between the tags
String valueFromXML = parser.getText();
// Store it in an array with the corresponding tag
// value
xmlPullParserArray[parserArrayIncrement++][1] = valueFromXML;
}
} while (eventType != XmlPullParser.END_DOCUMENT) ;
}
catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
}
// END OF NEW STUFF
return null;
}
// NEW STUFF
public InputStream getUrlData(String url) throws URISyntaxException,
ClientProtocolException, IOException {
// Used to get access to HTTP resources
DefaultHttpClient client = new DefaultHttpClient();
// Retrieves information from the URL
HttpGet method = new HttpGet(new URI(url));
// Gets a response from the client on whether the
// connection is stable
HttpResponse res = client.execute(method);
// An HTTPEntity may be returned using getEntity() which tells
// the system where the content is coming from
return res.getEntity().getContent();
}
public final void beginDocument(XmlPullParser parser, String firstElementName) throws XmlPullParserException, IOException
{
int type;
// next() advances to the next element in the XML
// document being a starting or ending tag, or a value
// or the END_DOCUMENT
while ((type=parser.next()) != parser.START_TAG
&& type != parser.END_DOCUMENT) {
;
}
// Throw an error if a start tag isn't found
if (type != parser.START_TAG) {
throw new XmlPullParserException("No start tag found");
}
// Verify that the tag passed in is the first tag in the XML
// document
if (!parser.getName().equals(firstElementName)) {
throw new XmlPullParserException("Unexpected start tag: found " + parser.getName() +
", expected " + firstElementName);
}
}
public final void nextElement(XmlPullParser parser) throws XmlPullParserException, IOException
{
int type;
// Cycles through elements in the XML document while
// neither a start or end tag are found
while ((type=parser.next()) != parser.START_TAG
&& type != parser.END_DOCUMENT) {
;
}
}
// END OF NEW STUFF
// Changes the values for a bunch of TextViews on the GUI
protected void onPostExecute(String result){
CompanyName.setText(xmlPullParserArray[9][1]);
YearLow.setText("Year Low: " + xmlPullParserArray[4][1]);
YearHigh.setText("Year High: " + xmlPullParserArray[5][1]);
DaysLow.setText("Days Low: " + xmlPullParserArray[2][1]);
DaysHigh.setText("Days High: " + xmlPullParserArray[3][1]);
LastPrice.setText("Last Price: " + xmlPullParserArray[7][1]);
Change.setText("Change: " + xmlPullParserArray[1][1]);
DailyPriceRange.setText("Daily Price Range: " + xmlPullParserArray[8][1]);
}
}
}
日志：
07-20 15:29:02.914: W/asset(26417): Copying FileAsset 0x727a6928 (zip:/data/app/com.example.quickstockinfo-2.apk:/resources.arsc) to buffer size 103468 to make it aligned. 07-20 15:29:03.064: I/Adreno-EGL(26417): : EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_KK_3.5_RB1.04.04.02.006.066_msm8974_refs/tags/AU_LINUX_ANDROID_KK_3.5_RB1.04.04.02.006.066__release_AU () 07-20 15:29:03.064: I/Adreno-EGL(26417): OpenGL ES Shader Compiler Version: E031.24.00.06 07-20 15:29:03.064: I/Adreno-EGL(26417): Build Date: 02/06/14 Thu 07-20 15:29:03.064: I/Adreno-EGL(26417): Local Branch: 07-20 15:29:03.064: I/Adreno-EGL(26417): Remote Branch: refs/tags/AU_LINUX_ANDROID_KK_3.5_RB1.04.04.02.006.066 07-20 15:29:03.064: I/Adreno-EGL(26417): Local Patches: NONE 07-20 15:29:03.064: I/Adreno-EGL(26417): Reconstruct Branch: NOTHING 07-20 15:29:04.734: I/InputMethodManager(26417): [startInputInner] EditorInfo { packageName=com.example.quickstockinfo, inputType=0x20001, imeOptions=0x40000006, privateImeOptions=null }, windowGainingFocus=安卓.view.ViewRootImpl$W@41b654b8, mServedView=安卓.widget.EditText{41b47ae0 VFED..CL .F....ID 574,0-1080,118 #7f05003d app:id/stocksymbol} 07-20 15:29:07.674: I/InputMethodManager(26417): [startInputInner] EditorInfo { packageName=com.example.quickstockinfo, inputType=0x20001, imeOptions=0x40000006, privateImeOptions=null }, windowGainingFocus=null, mServedView=安卓.widget.EditText{41b47ae0 VFED..CL .F...... 574,0-1080,118 #7f05003d app:id/stocksymbol} 07-20 15:29:07.704: D/test(26417): In XmlPullParser 07-20 15:29:07.914: D/libc(26417): [NET] getaddrinfo+,hn 19(0x71756572792e79),sn(),family 0,flags 4 07-20 15:29:07.914: D/libc(26417): [NET] getaddrinfo-,err=8 07-20 15:29:07.914: D/libc(26417): [NET] getaddrinfo+,hn 19(0x71756572792e79),sn(),family 0,flags 1024 07-20 15:29:07.914: D/libc(26417): [NET] getaddrinfo-, 1 07-20 15:29:07.914: D/libc(26417): [NET] getaddrinfo_proxy+ 07-20 15:29:07.934: D/libc(26417): [NET] getaddrinfo_proxy-, success 07-20 15:29:07.934: I/global(26417): call createSocket() return a new socket. 07-20 15:29:07.934: D/libc(26417): [NET] getaddrinfo+,hn 14(0x39382e3133372e),sn(),family 0,flags 4 07-20 15:29:07.934: D/libc(26417): [NET] getaddrinfo-, SUCCESS 07-20 15:29:20.114: I/InputMethodManager(26417): [startInputInner] EditorInfo { packageName=com.example.quickstockinfo, inputType=0x20001, imeOptions=0x40000006, privateImeOptions=null }, windowGainingFocus=null, mServedView=安卓.widget.EditText{41b47ae0 VFED..CL .F...... 574,0-1080,118 #7f05003d app:id/stocksymbol} 07-20 15:29:20.174: D/test(26417): In XmlPullParser 07-20 15:29:20.204: D/libc(26417): [NET] getaddrinfo+,hn 19(0x71756572792e79),sn(),family 0,flags 4 07-20 15:29:20.204: D/libc(26417): [NET] getaddrinfo-,err=8 07-20 15:29:20.204: D/libc(26417): [NET] getaddrinfo+,hn 19(0x71756572792e79),sn(),family 0,flags 1024 07-20 15:29:20.204: D/libc(26417): [NET] getaddrinfo-, 1 07-20 15:29:20.204: D/libc(26417): [NET] getaddrinfo_proxy+ 07-20 15:29:20.214: D/libc(26417): [NET] getaddrinfo_proxy-, success 07-20 15:29:20.214: I/global(26417): call createSocket() return a new socket. 07-20 15:29:20.214: D/libc(26417): [NET] getaddrinfo+,hn 14(0x39382e3133372e),sn(),family 0,flags 4 07-20 15:29:20.214: D/libc(26417): [NET] getaddrinfo-, SUCCESS 07-20 15:29:20.374: W/dalvikvm(26417): threadid=12: thread exiting with uncaught exception (group=0x416ebe18) 07-20 15:29:20.374: E/AndroidRuntime(26417): FATAL EXCEPTION: AsyncTask #2 07-20 15:29:20.374: E/AndroidRuntime(26417): Process: com.example.quickstockinfo, PID: 26417 07-20 15:29:20.374: E/AndroidRuntime(26417): java.lang.RuntimeException: An error occured while executing doInBackground() 07-20 15:29:20.374: E/AndroidRuntime(26417): at 安卓.os.AsyncTask$3.done(AsyncTask.java:300) 07-20 15:29:20.374: E/AndroidRuntime(26417): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) 07-20 15:29:20.374: E/AndroidRuntime(26417): at java.util.concurrent.FutureTask.setException(FutureTask.java:222) 07-20 15:29:20.374: E/AndroidRuntime(26417): at java.util.concurrent.FutureTask.run(FutureTask.java:242) 07-20 15:29:20.374: E/AndroidRuntime(26417): at 安卓.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 07-20 15:29:20.374: E/AndroidRuntime(26417): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 07-20 15:29:20.374: E/AndroidRuntime(26417): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 07-20 15:29:20.374: E/AndroidRuntime(26417): at java.lang.Thread.run(Thread.java:864) 07-20 15:29:20.374: E/AndroidRuntime(26417): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=13; index=13 07-20 15:29:20.374: E/AndroidRuntime(26417): at com.example.quickstockinfo.MainActivity$MyAsyncTask.doInBackground(MainActivity.java:231) 07-20 15:29:20.374: E/AndroidRuntime(26417): at com.example.quickstockinfo.MainActivity$MyAsyncTask.doInBackground(MainActivity.java:1) 07-20 15:29:20.374: E/AndroidRuntime(26417): at 安卓.os.AsyncTask$2.call(AsyncTask.java:288) 07-20 15:29:20.374: E/AndroidRuntime(26417): at java.util.concurrent.FutureTask.run(FutureTask.java:237) 07-20 15:29:20.374: E/AndroidRuntime(26417): ... 4 more
# 1 楼答案
最有可能的是，您在第二次通过时没有重置
parserArrayIncrement。但这只是一个猜测，没有行号，只有你发布的“数组索引超出范围”错误# 2 楼答案
这行
15:29:20.374: E/AndroidRuntime(26417): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=13; index=13 07-20 15:29:20.374: ...也就是说，您试图访问一个与数组中字符串数量一样大的索引。两者都是13，但对于以0开始计数的数组，会出现异常。 我很快就看不出问题的确切位置在哪里# 3 楼答案
这份声明
应该从第87行移到方法