Taking a quick look at some of my more recent code, I actually use a
combination of DefaultHttpClient and HttpGet. See:
https://developer.android.com/reference/org/apache/http/impl/client/DefaultHttpClient.html
https://developer.android.com/reference/org/apache/http/client/methods/HttpGet.html
This is an example to use a GET request to receive data, but that
doesn't mean this is a perfect example:
byte[] data = null;
DefaultHttpClient client = new DefaultHttpClient();
HttpGet gReq = new HttpGet("http://www.whatever.url";);
gReq.setHeader("User-Agent", "My App");
try {
HttpResponse a = client.execute(gReq);
if (a.getStatusLine().getStatusCode() == 200) {
HttpEntity entity = a.getEntity();
long contentLength = entity.getContentLength();
BufferedInputStream bis = new BufferedInputStream(
entity.getContent());
ByteArrayOutputStream out = new ByteArrayOutputStream(
(int) contentLength);
long bytesReceived = 0;
int currentReceived = 0;
byte[] buf = new byte[10000];
do {
currentReceived = bis.read(buf, 0, 10000);
bytesReceived += currentReceived;
out.write(buf, 0, currentReceived);
} while (bytesReceived < contentLength);
data = out.toByteArray();
out.close();
out = null;
entity = null;
bis.close();
bis = null;
}
} catch (ClientProtocolException e) {
Debug.showStackTrace(e);
} catch (IOException e) {
Debug.showStackTrace(e);
}
At the end of this, you have a byte array in data that can be converted
to a String and manipulated that way, or you can plug it into other
objects and use it there. For example, if you convert it to a string,
you can output the received data to android.util.Log so you can see it
in your development environment or write it to a log file rather than
building a WebView. If you use that code in a function, there's no
reason you couldn't pass in a URL and call the same code as many times
as you want or need, whereas I think WebView caches the results of
requests, but I've never used it personally.
Hope that helps.
On 11/04/2016 04:14 AM, [email protected] wrote:
Could you give me a direction on how to use HTTP connection? I'm
pretty new to Andoid programming
Op dinsdag 1 november 2016 16:27:20 UTC+1 schreef Raymond Rodgers:
I'm not familiar with the software you're using (on the server
side), but if the WebView is going to be invisible, why are you
using it? Does the triggering web page/API use some Javascript or
something to accomplish the task? If not, I would use a different
method. Forgive me, it's been a while since I've done any active
coding on Android, but I'm pretty sure there are HTTPConnection
classes or something to that effect that take a Url object (or
string) that can make the requests much more efficiently if all
you need to do is send and receive some data.
On 11/01/2016 08:36 AM, [email protected] <javascript:> wrote:
*KICK*
I need help
Op woensdag 26 oktober 2016 08:58:33 UTC+2 schreef
[email protected]:
Hello,
I wrote an (really basic) application to control access for a
building. This application exists of multiple buttons (10 in
total).
Per door there are 2 buttons. One button acts as an pulse
buton. When clicking the pulse button a timer function will
be enabled and after 5 seconds the function will be disabled.
The other button enables or disables the function manualy
(without a timer).
When the function is enabled a URL request is send out to
load within a WebView. The URL that is requested is an URL
trigger for a webrelay which will trgger the door to unlock.
When the function is disabled a URL request is send out to
load within a WebView. The URL that is requested is an URL
trigger for a webrelay which will trgger the door to lock.
For testing the URL request i used URL's like:
http://www.cisco.com
http://www, nu.nl <http://nu.nl>
The URL's requested will appear in a Webview (which will be
invisible in the final version).
Each door has it's own door WebView.
So for short:
One door has:
2 buttons;
1 timer function;
1 WebView.
There are 5 doors in total.
Now the problem coms that after running this error will occure:
A/libc: Fatal signal 11 (SIGSEGV) at 0x0000001c (code=1),
thread 25881 (WebViewCoreThre)
After searching on the internet, i learned this could be a
memory issue.
But i don't have a clue to how address this, or what the
problem could be. I tried to eleminate the images that i
used, but that didn't work.
The application is develloped for Android 4.1 (Jellybean).
How can i resolve this problem ??
Regards.
Dennie
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