android file download urlConn.getInputStream () throwing NUllPointerException

posts by wei542657623 on 2014-04-23 07:41:57 Edit

android tomcat NullPointException getInputStream file download

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Recently made an android software, you need to download files from the server. I am referring to mars video file to download, do first a little experiment. Do not know why urlConn.getInputStream () has been throwing NullPointerException. Here are some of the code used:

 
url = new URL (urlStr); 
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection (); 
buffer = new BufferedReader (new InputStreamReader (urlConn.getInputStream ())); / / Proven is urlConn.getInputStream () throw Exception 

1, I've added AndroidManifest.xml file permissions:

 
<-! Required permission to use network functions -> 
 
 
 
 
 
 
 
 

2, I'm on my phone's browser to access tomcat under urlStr specified file, so it should be no problem urlStr

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There try catch you
Reply:
There
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cited a floor licai1210 reply:

have try catch you

There
There I made yesterday in the following forum posts, you look in more detail.
Can not stay QQ ah, easy to contact
Reply:
Where you put the http request, and is in the sub-thread it?