android.os.NetworkOnMainThreadException и java.lang.reflect.InvocationTargetException

Question

У меня проблема. Я хочу знать, где были android.os.NetworkOnMainThreadException и
java.lang.reflect.InvocationTargetException Exception исходить от!

Пожалуйста, я новичок в Android, и мне нужна ваша помощь!

Мой LogCat:

12-19 13:00:27.049: E/AndroidRuntime(1170): FATAL EXCEPTION: main 
12-19 13:00:27.049: E/AndroidRuntime(1170): java.lang.IllegalStateException: Could not execute method of the activity 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at android.view.View$1.onClick(View.java:3633) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at android.view.View.performClick(View.java:4240) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at android.view.View$PerformClick.run(View.java:17721) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at android.os.Handler.handleCallback(Handler.java:730) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at android.os.Handler.dispatchMessage(Handler.java:92) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at android.os.Looper.loop(Looper.java:137) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at android.app.ActivityThread.main(ActivityThread.java:5103) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at java.lang.reflect.Method.invoke(Method.java:525) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at dalvik.system.NativeStart.main(Native Method) 
12-19 13:00:27.049: E/AndroidRuntime(1170): Caused by: java.lang.reflect.InvocationTargetException 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at java.lang.reflect.Method.invoke(Method.java:525) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at android.view.View$1.onClick(View.java:3628) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  ... 11 more 
12-19 13:00:27.049: E/AndroidRuntime(1170): Caused by: android.os.NetworkOnMainThreadException 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at libcore.io.IoBridge.connect(IoBridge.java:112) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at java.net.Socket.connect(Socket.java:842) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  at com.ensem.sehaty.MainActivity.recupererListMed(MainActivity.java:58) 
12-19 13:00:27.049: E/AndroidRuntime(1170):  ... 14 more 
12-19 13:05:27.366: I/Process(1170): Sending signal. PID: 1170 SIG: 9 

MainActivity.java

public class MainActivity extends Activity { 

    Button btnRecupListMed = null; 
    ListView listeMed = null; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     btnRecupListMed = (Button) findViewById(R.id.btnListMed); 
     listeMed = (ListView) findViewById(R.id.listMed); 
    } 

    public void recupererListMed(View v){ 

     BufferedReader br = null; 
     StringBuffer sb = new StringBuffer(""); 

     try { 
      HttpClient client = new DefaultHttpClient(); 
      HttpProtocolParams.setUseExpectContinue(client.getParams(), false); 
      HttpGet get = new HttpGet(); 
      URI uri = new URI("http://105.153.20.252"); 
      get.setURI(uri); 
      HttpResponse reponse = client.execute(get); 
      InputStream is = reponse.getEntity().getContent(); 
      br = new BufferedReader(new InputStreamReader(is)); 
      String str = br.readLine(); 
      while(str != null){ 
       sb.append(str); 
       sb.append("\n"); 
       str = br.readLine(); 
      } 
     } catch (URISyntaxException e) { 
      e.printStackTrace(); 
      System.out.println("Erreur 1"); 
     } catch (ClientProtocolException e) { 
      e.printStackTrace(); 
      System.out.println("Erreur 2"); 
     } catch (IOException e) { 
      e.printStackTrace(); 
      System.out.println("Erreur 3"); 
     } 

     try { 
      //ArrayList<HashMap<String, String>> medecins = new ArrayList<HashMap<String, String>>(); 

      JSONArray js = new JSONArray(sb.toString()); 
      List<String> listM = new ArrayList<String>(); 
      for(int i=0; i<js.length(); i++){    
        JSONObject jsObj = js.getJSONObject(i); 
        String nom = jsObj.getString("NOMMED"); 
        listM.add(nom); 
      } 

       ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
          android.R.layout.simple_list_item_1, R.id.listMed, listM); 

       listeMed.setAdapter(adapter); 

     } catch (JSONException e) { 
      e.printStackTrace(); 
      System.out.println("Erreur 4"); 
     } 
    } 



    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

} 

activity_main.xml

<TextView 
     android:text="@string/lbl_sehaty" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     /> 

    <Button 
     android:id="@+id/btnListMed" 
     android:text="@string/lbl_btn" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="20dp" 
     android:onClick="recupererListMed" 
     /> 

    <ListView 
       android:id="@+id/listMed" 
       android:layout_height="wrap_content" 
       android:layout_width="match_parent" 
       android:layout_marginTop="60dp"> 

     </ListView> 

И мой Manifest содержит следующее разрешение

<uses-permission android:name="android.permission.INTERNET"></uses-permission> 

Спасибо.

Answer 1

Эта ошибка возникает, когда вы пытаетесь сделать серверный вызов в потоке пользовательского интерфейса.

Вы должны создать AsyncTask и поместить в него свой серверный вызов.

И при нажатии кнопки вызова выполнить на объекте asynctask.

Ex:

public class ServiceTask extends AsyncTask<String, Void, String> { 



    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
    } 

    @Override 
    protected String doInBackground(String... params) { 

     BufferedReader br = null; 
     StringBuffer sb = new StringBuffer(""); 

     try { 
      HttpClient client = new DefaultHttpClient(); 
      HttpProtocolParams.setUseExpectContinue(client.getParams(), false); 
      HttpGet get = new HttpGet(); 
      URI uri = new URI("http://105.153.20.252"); 
      get.setURI(uri); 
      HttpResponse reponse = client.execute(get); 
      InputStream is = reponse.getEntity().getContent(); 
      br = new BufferedReader(new InputStreamReader(is)); 
      String str = br.readLine(); 
      while(str != null){ 
       sb.append(str); 
       sb.append("\n"); 
       str = br.readLine(); 
      } 


     } catch (URISyntaxException e) { 
      e.printStackTrace(); 
      System.out.println("Erreur 1"); 
     } catch (ClientProtocolException e) { 
      e.printStackTrace(); 
      System.out.println("Erreur 2"); 
     } catch (IOException e) { 
      e.printStackTrace(); 
      System.out.println("Erreur 3"); 
     } 
     return sb; 
    } 

    @Override 
    protected void onPostExecute(String result) { 
     try { 
      //ArrayList<HashMap<String, String>> medecins = new ArrayList<HashMap<String, String>>(); 

      JSONArray js = new JSONArray(result.toString()); 
      List<String> listM = new ArrayList<String>(); 
      for(int i=0; i<js.length(); i++){    
        JSONObject jsObj = js.getJSONObject(i); 
        String nom = jsObj.getString("NOMMED"); 
        listM.add(nom); 
      } 

       ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
          android.R.layout.simple_list_item_1, R.id.listMed, listM); 

       listeMed.setAdapter(adapter); 

     } catch (JSONException e) { 
      e.printStackTrace(); 
      System.out.println("Erreur 4"); 
     } 
    } 
} 

И внутри события OnClick:

public void recupererListMed(View v){ 
    new ServiceTask().execute(); 
} 

Это будет выполнять doInBackground метод в другом потоке и один раз результат забирается onPostExecute вызывается UI потоке.