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아래 링크와 같이 설정을 해주면 된다.
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy);
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출처: http://stackoverflow.com/questions/16128132/program-crashing-at-connect-on-android-not-connecting
program crashing at .connect() on Android, not connecting
I been trying to figure this out for hours now. I've searched for answers, but I can't find an answer. I have never bothered to ask before and this is the first time I'm asking a question. Basically what I am doing is breaking up my coding for organization purposes. The following snippet works just fine, but when I take it and place it into another class the urlConnect(); connects just fine. I've marked it below
public String downloadUrl(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
URL url = new URL(strUrl);
String line = "";
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
/* Connecting to url */
urlConnection.connect(); <-------------------------works in this snippet
/* Reading data from url */
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
while((line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
}
catch(Exception e){
Log.d("Exception while downloading url", e.toString());
}
finally {
iStream.close();
urlConnection.disconnect();
}
return data;
}So this following snippet, is pretty much identical. But for some reason it doesn't want to connect:
public String getJSONobject(String strUrl) throws IOException{
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try{
URL url = new URL(strUrl);
String line = "";
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.connect(); <------------------ Does not work
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
while((line = br.readLine()) != null){
sb.append(line);
}
data = sb.toString();
br.close();
iStream.close();
}
catch (MalformedURLException e1) {
e1.printStackTrace();
}
catch (IOException e1) {
e1.printStackTrace();
}
finally {
if(null != urlConnection) { urlConnection.disconnect();
}
return data;
The LogCat:
>at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1131)
>at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
>at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
>at java.net.InetAddress.getAllByName(InetAddress.java:214)
>at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
>at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
>at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
>at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
>at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
>at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315)
>at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.makeSslConnection(HttpsURLConnectionImpl.java:461)
>at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.connect(HttpsURLConnectionImpl.java:433)
>at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289)
>at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239)
>at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
>at libcore.net.http.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:165)
>at com.navsquad.shsu.katlas2.RouteJSONobject.getJSONobject(RouteJSONobject.java:57)
>at com.navsquad.shsu.katlas2.CreateRoute.create(CreateRoute.java:41)
>at com.navsquad.shsu.katlas2.MainActivity$3.onMapClick(MainActivity.java:84)
>at com.google.android.gms.maps.GoogleMap$6.onMapClick(Unknown Source)
>at com.google.android.gms.internal.t$a.onTransact(Unknown Source)
>at android.os.Binder.transact(Binder.java:326)
>at com.google.android.gms.maps.internal.IOnMapClickListener$Stub$Proxy.onMapClick(IOnMapClickListener.java:93)
>at maps.i.s.b(Unknown Source)
>at maps.y.v.c(Unknown Source)
>at maps.y.bf.onSingleTapConfirmed(Unknown Source)
>at maps.d.v.onSingleTapConfirmed(Unknown Source)
>at maps.d.j.handleMessage(Unknown Source)
>at android.os.Handler.dispatchMessage(Handler.java:99)
>at android.os.Looper.loop(Looper.java:137)
>at android.app.ActivityThread.main(ActivityThread.java:5059)
>at java.lang.reflect.Method.invokeNative(Native Method)
>at java.lang.reflect.Method.invoke(Method.java:511)
>at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
>at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
>at dalvik.system.NativeStart.main(Native Method)So again to make it clear, all I was doing was making a separate class for my own organization. Originally I had a parser included in, but I have now split it up into different classes, so I can use other parsers with the string/JSON Object. If you could help me figure out what is different from before, I would appreciate. Original class was in an implemented AsyncTask Class.
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I don't understand why it is that Google works much better for me than for some many other people. When I search for this exception, I get thousands of results. The top three all have the solution offered by Vipul. The quality of SO has fallen a lot recently. I estimate about 60% of all questions on here are answered with a simple search. Signal to noise ratio is very poor.
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possible duplicate of android.os.NetworkOnMainThreadException
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Sir, I've spent hours searching and testing everything I've found on the subject. Yet I get the same results every time. I've use stackoverflow for a very long time and never had to ask my own questions. I've even found that same thread, and that did not answer my problem. I did not get on here to get insulted. If that is what you need to do, fine do so
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android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1131)
It seems you've attempted to invoke blocking network api's on the UI thread of your application.
In Android 3.0 and above version there is a new application policy that don't allows the execution of networking calls on the main thread.
Please go through http://developer.android.com/reference/android/os/StrictMode.html.
You can disable strictmode by putting following folling snippet.(I would not recommed this approach in production environment.)
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| So to use the HttpConnect, do I have to use it in a separate thread? Just like how the AsyncTask is used? This would make sense with that first line of the logcat. I'm not too keen on disabling strictmode. – NERDx Apr 21 '13 at 5:21 | |
| @NERDx Its MUST you should create separate thread to perform network operations.Remember to update UI only from main thread. – Vipul Shah Apr 21 '13 at 5:26 | |
| Thank you for your input. That is really all I needed to know. I've only started on Android 2 weeks ago. Now it's time to learn how to play with threads a litte better in 2 days haha. – NERDx Apr 21 '13 at 5:36 | |
| @NERDx All the best for the adventures :) |
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