我一直在努力解决这个问题。我已经找到了答案,但我找不到答案。我以前从未打扰过这个问题,这是我第一次提出问题。基本上我正在做的是为了组织目的打破我的编码。下面的代码片段工作得很好,但是当我把它拿到另一个类时,urlConnect();连接就好了。我在下面标记了它。
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;
}
所以这个以下片段几乎完全相同。但由于某种原因,它不想连接:
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;
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$MethodAndArgsCaller.run(ZygoteInit.java:792)
>at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
>at dalvik.system.NativeStart.main(Native Method)
再次说清楚,我所做的只是为自己的组织制作一个单独的课程。最初我有一个解析器,但我现在已将它拆分为不同的类,所以我可以使用其他解析器与字符串/ JSON对象。如果你能帮我弄清楚以前有什么不同,我将不胜感激。原始类位于已实现的AsyncTask类中。
答案 0 :(得分:7)
android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1131)
您似乎试图在应用程序的UI线程上调用阻止网络api。
在Android 3.0及更高版本中,有一个新的应用程序策略不允许在主线程上执行网络调用。
请浏览http://developer.android.com/reference/android/os/StrictMode.html。
您可以通过添加以下folling片段来禁用strictmode。(我不建议在生产环境中使用此方法。)
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);