Android Index out of bounds
I am trying to get the bold text next to the hour scheldule ( from http://golfnews.no/golfpaatv.php )put it in a String array , then , show it on my device's screen. I've put the Internet Access permission , so that is not the problem.The application crashes on my device . Reason : index out of bounds . I don't understand where's the problem . My code is :
package com.work.webrequest;
import java.io.IOException;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class WebRequest extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String trax;
String aux[] = new String[10];
setContentView(R.layout.main);
TextView txt = (TextView) findViewById(R.id.textView1);
trax=getPage();
aux= title (trax);
txt.setText(" Here I will display every title!!!");
}
private String[] title (String trax)
{
String result[] = new String[10];
int ok=1;
int s1,s2;
int i=0;
while(ok==1)
{
System.out.println("INDEX = "+trax.indexOf("<h2>"));
ok=0;
if(trax.indexOf("<h2>")!=-1)
{
ok=1;
s1 =trax.inde开发者_运维知识库xOf("<h2>");
s2 = trax.indexOf("</h2>");
result[i] = trax.substring(s1+4,s2);
i++;
trax = trax.substring(trax.indexOf("</h2>"));
}
}
return result;
}
private String getPage() {
String str = "***";
try
{
HttpClient hc = new DefaultHttpClient();
HttpPost post = new HttpPost("http://www.golfnews.no/feed.php?feed=1");
HttpResponse rp = hc.execute(post);
if(rp.getStatusLine().getStatusCode() == HttpStatus.SC_OK)
{
str = EntityUtils.toString(rp.getEntity());
}
}catch(IOException e){
e.printStackTrace();
}
return str;
}
}
The number of <h2>
and </h2>
is below 10 . My application crashes at the 2nd iteration . I am a beginner in android , so I don't know much . Could you give me a hint ? I would really appreciate it . Thank you !
PS : I know what Index Out of bounds means , I just don't know why I get the error here .
You get IndexOutOfBoundsException
when you want to access an array index which is out of range. For example:
String[] myArray = new String[10];
myArray[10] = "test"; // 10 is out of limits(0-9)
Would produce such an exception. Check the stacktrace for the line that this exception originates from. It tells you the class name/method name/line number that this problem comes from.
In your case I suspect there are more than 10 <h2>
in the trax
, so you get this exception.
Initially you don't know the number of <h2>
's so change this line:
String result[] = new String[10];
with this:
ArrayList<String> result= new ArrayList<String>();
Then you can add elements to this list with the following:
// result[i] = trax.substring(s1+4,s2);
result.add(trax.substring(s1+4,s2));
EDIT1
Also I think you mean this:
//trax = trax.substring(trax.indexOf("</h2>"));
trax = trax.substring(s2 + 5);
EDIT2
Also I realized you allocate arrays wrong, you are allocating a String of 10 chars instead of an array of 10 Strings:
//String aux[] = new String[10];
String[] aux = new String[10];
//String result[] = new String[10];
String[] result = new String[10];
try this one too..
if(trax.indexOf("<h2>")!=-1&&i<10)
{
ok=1;
s1 =trax.indexOf("<h2>");
s2 = trax.indexOf("</h2>");
result[i] = trax.substring(s1+4,s2);
i++;
trax = trax.substring(trax.indexOf("</h2>"));
}
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