应用仅适用于第一个输入，如果插入第二个输入，则崩溃
[英]App only works with first input, crashes after if second input is inserted
问题描述
The app works as intended. 
该应用程序按预期工作。 A stock symbol is entered, enter button is pressed, and the data is pulled from yahoo webservice and is displayed on screen. 输入股票代码，按下输入按钮，数据将从yahoo Webservice提取并显示在屏幕上。 However, after the first stock symbol is displayed, if i enter a new stock symbol, the app crashes. 但是，在显示第一个股票代码后，如果我输入新的股票代码，则应用程序将崩溃。
MainActivity.java MainActivity.java
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 android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TableRow;
import android.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]);
}
}
}
LogCat: logcat的：
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.
3 个解决方案
解决方案1
0 2014-07-20 20:07:00
Most likely you are not resetting your parserArrayIncrement during your second pass through. 您很可能在第二遍过程中没有重置parserArrayIncrement 。 But that's just a guess without having line numbers and only having the "Array index out of range" error you posted... 但这只是一个猜测，没有行号，只有您发布的“数组索引超出范围”错误...
解决方案2
0 已采纳 2014-07-20 20:10:51
This declaration 这个宣言
int parserArrayIncrement = 0;
should be moved from line 87 into method 应该从第87行移到方法中
protected String doInBackground(
int parserArrayIncrement = 0;
解决方案3
0 2014-07-20 20:14:51
This line 15:29:20.374: E/AndroidRuntime(26417): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=13; index=13 07-20 15:29:20.374: ... 第15:29:20.374: E/AndroidRuntime(26417): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=13; index=13 07-20 15:29:20.374: ... 15:29:20.374: E/AndroidRuntime(26417): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=13; index=13 07-20 15:29:20.374: ... means, that you try to access an index as big as the number of strings inside the array. 15:29:20.374: E/AndroidRuntime(26417): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=13; index=13 07-20 15:29:20.374: ...表示，您尝试访问的索引与数组内字符串的数量一样大。 Both is 13, but for arrays start counting with 0, you get an exception. 两者均为13，但是对于以0开始计数的数组，则会出现异常。 In a quick way I can't see, where exactly the position of the issue is 很快我看不到问题的确切位置在哪里
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