¿UrlConnection no funciona desde API 10 y superior?

Question

Oye, estoy teniendo un gran problema con mi aplicación de Android. Actualmente lo estoy actualizando y cambié de API 8 a API 10 y el siguiente bloque de código ya no funciona ...

URL url = new URL(PingUrl);
URLConnection Conn = url.openConnection();
Conn.setConnectTimeout(4000);
int Size = 2048;
BufferedReader input = new BufferedReader(new InputStreamReader(Conn.getInputStream()), Size);
String line = null;
while ((line = input.readLine()) != null) {
    JSONObject jo = new JSONObject(line);
    String timeStamp = jo.getString("timestamp");
    //Log.i("Value",timeStamp);
}
input.close();
result = true;

Se bloquea @ BufferedReader ... ¿Alguien tiene una idea?

10-19 16:46:04.814: ERROR/AndroidRuntime(2151): FATAL EXCEPTION: main
10-19 16:46:04.814: ERROR/AndroidRuntime(2151): java.lang.RuntimeException: Unable to start activity ComponentInfo{be.paratel.PAC/be.paratel.PAC.PACMainViewActivity}: android.os.NetworkOnMainThreadException
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at android.app.ActivityThread.access$500(ActivityThread.java:122)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024)

10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at android.os.Handler.dispatchMessage(Handler.java:99)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at android.os.Looper.loop(Looper.java:132)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at android.app.ActivityThread.main(ActivityThread.java:4123)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at java.lang.reflect.Method.invokeNative(Native Method)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at java.lang.reflect.Method.invoke(Method.java:491)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at dalvik.system.NativeStart.main(Native Method)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151): Caused by: android.os.NetworkOnMainThreadException
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1077)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at java.net.InetAddress.lookupHostByName(InetAddress.java:477)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:277)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at java.net.InetAddress.getAllByName(InetAddress.java:249)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:69)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:48)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect(HttpConnection.java:304)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:89)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHttpConnection(HttpURLConnectionImpl.java:292)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.makeConnection(HttpURLConnectionImpl.java:274)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.retrieveResponse(HttpURLConnectionImpl.java:1038)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:523)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at be.paratel.PAC.PACMainViewActivity.pingTheApplication(PACMainViewActivity.java:245)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at be.paratel.PAC.PACMainViewActivity.ConnectionCheck(PACMainViewActivity.java:296)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at be.paratel.PAC.PACMainViewActivity.onCreate(PACMainViewActivity.java:70)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at android.app.Activity.performCreate(Activity.java:4397)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779)
10-19 16:46:04.814: ERROR/AndroidRuntime(2151):     ... 11 more

Answer 1

Nunca enfrenté ese problema, pero creo que el StackTrace te está diciendo lo que está mal: NetworkOnMainThreadException

Parece que Android OS está prohibiendo una solicitud HTTP sincrónica en el hilo principal, porque esto bloqueará la interfaz de usuario. Por lo tanto, parece evitar que tome malas decisiones (creo que buena idea). Deberías usar un Asíncata Para solicitudes de red de todos modos.

Answer 2

Eche un vistazo a este artículo, presenta algunos de los clientes Android HTTP y algunos de los cambios que han experimentado.

Clientes HTTP de Android