안드로이드에서 HTTP 요청 실패

Question

http 요청을 받으려면 다음 코드를 사용하려고합니다. URL은 다음과 같습니다.

String url = "http://vlm1.uta.edu/~zhangzhong/questions.json";

InputStream source = retrieveStream(url)을 호출하면 오류가 발생합니다. 36 :

04-22 16 : 37.042 : D/dalvikvm (3840) 방법에 의해 이미 <uses-permission android:name="android.permission.INTERNET"/>

private InputStream retrieveStream(String url) { 

     DefaultHttpClient client = new DefaultHttpClient(); 

     HttpGet getRequest = new HttpGet(url); 

     try { 

      HttpResponse getResponse = client.execute(getRequest); 
      final int statusCode = getResponse.getStatusLine().getStatusCode(); 

      if (statusCode != HttpStatus.SC_OK) { 
       Log.w(getClass().getSimpleName(), "Error " + statusCode + " for URL " + url); 
       return null; 
      } 

      HttpEntity getResponseEntity = getResponse.getEntity(); 
      return getResponseEntity.getContent(); 

     } 
     catch (IOException e) { 
      getRequest.abort(); 
      Log.w(getClass().getSimpleName(), "Error for URL " + url, e); 
     } 

     return null; 
    } 

다음은 로그 캣 인 추가 한 디버거가 분리되었다; 개체 레지스트리했다 427

entries 
04-22 16:36:37.042: I/dalvikvm(3840): ignoring registerObject request in thread=1 
04-22 16:36:37.042: I/dalvikvm(3840): ignoring registerObject request in thread=1 
04-22 16:36:37.042: D/AndroidRuntime(3840): Shutting down VM 
04-22 16:36:37.042: W/dalvikvm(3840): threadid=1: thread exiting with uncaught exception (group=0x41760930) 
04-22 16:36:37.072: E/AndroidRuntime(3840): FATAL EXCEPTION: main 
04-22 16:36:37.072: E/AndroidRuntime(3840): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.flashcard/com.example.flashcard.MainActivity}: android.os.NetworkOnMainThreadException 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at android.os.Looper.loop(Looper.java:137) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at java.lang.reflect.Method.invoke(Method.java:511) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at dalvik.system.NativeStart.main(Native Method) 
04-22 16:36:37.072: E/AndroidRuntime(3840): Caused by: android.os.NetworkOnMainThreadException 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at java.net.InetAddress.getAllByName(InetAddress.java:214) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at com.example.flashcard.MainActivity.retrieveStream(MainActivity.java:63) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at com.example.flashcard.MainActivity.onCreate(MainActivity.java:37) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at android.app.Activity.performCreate(Activity.java:5104) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
04-22 16:36:37.072: E/AndroidRuntime(3840):  ... 11 more 
04-22 16:36:37.092: I/Process(3840): Sending signal. PID: 3840 SIG: 9 
04-22 16:37:37.727: D/AndroidRuntime(3957): Shutting down VM 
04-22 16:37:43.443: D/AndroidRuntime(4077): Shutting down VM 
04-22 16:37:43.443: W/dalvikvm(4077): threadid=1: thread exiting with uncaught exception (group=0x41760930) 
04-22 16:37:43.443: E/AndroidRuntime(4077): FATAL EXCEPTION: main 
04-22 16:37:43.443: E/AndroidRuntime(4077): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.flashcard/com.example.flashcard.MainActivity}: android.os.NetworkOnMainThreadException 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at android.os.Looper.loop(Looper.java:137) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at java.lang.reflect.Method.invoke(Method.java:511) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at dalvik.system.NativeStart.main(Native Method) 
04-22 16:37:43.443: E/AndroidRuntime(4077): Caused by: android.os.NetworkOnMainThreadException 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at java.net.InetAddress.getAllByName(InetAddress.java:214) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at com.example.flashcard.MainActivity.retrieveStream(MainActivity.java:63) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at com.example.flashcard.MainActivity.onCreate(MainActivity.java:37) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at android.app.Activity.performCreate(Activity.java:5104) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
04-22 16:37:43.443: E/AndroidRuntime(4077):  ... 11 more 
04-22 16:37:44.865: I/Process(4077): Sending signal. PID: 4077 SIG: 9 

Answer 1

여기서 일어나는 일은 일반적으로, 응용 프로그램의 주 스레드에서 일부 장기 실행 작업을 수행하려고합니다.

그게 무슨 뜻입니까, 안드로이드가 당신이 차단하려고하는 몇 가지 장기 실행 작업을 수행하는 감지하면 부드러운 경험을 실시하기 위해, UI를 업데이 트하는 담당하고 있다는 것입니다, 그것은 응용 프로그램을 강제 종료합니다 , 이것이 나쁘다는 것을 당신에게 알리기 위해서.

AsynTask 또는 IntentService와 같은 다양한 대체 솔루션이 있습니다.

IntentService 당신이 그것을에 의도 보낼 때 실행하는 서비스입니다 :

public class NetworkHandler extends IntentService { 
    @Override 
    protected void onHandleIntent(Intent intent) { 
     //Do your request here 
    } 
} 

IntentService를 활성화하려면를 간단하게 수행

Intent intent = new Intent(mContext, NetworkHandler.class); 
startService(intent);