Android : 웹에서 텍스트 파일을 다운로드하는 중 오류가 발생했습니다.

Question

4 개의 탭이있는 앱이 있는데 하나는 웹에서 입력 텍스트 파일을 업데이트하고 SD 카드에 쓰는 것입니다. try catch 블록 때문에 코드가 실행되지만 추적에 연결 오류가 표시됩니다. 파일은 sd 카드에 기록되지만 0 바이트입니다. 그래서 파일 쓰기는 좋지만 hhtp 연결 문제가 있다고 생각합니다. 나는 Windows 7 64 비트를 최신 SDK와 함께 사용하고 있습니다.

public void downloadFile (String urlfile) throws IllegalStateException, IOException 
    { 

    InputStream instream = null; 
    String result = null; 


    try { 
    //set the download URL, a url that points to a file on the internet 
    //this is the file to be downloaded 

      URL url = new URL(urlfile); 


    HttpClient httpclient = new DefaultHttpClient(); 

    // Prepare a request object 
     HttpGet httpget = new HttpGet(urlfile); 

    // Execute the request 
     HttpResponse response; 

     File file = new File(Environment.getExternalStorageDirectory(), "myfile.txt");  

     FileOutputStream fileOutput = new FileOutputStream(file); 

       OutputStreamWriter myOutWriter = new OutputStreamWriter(
        fileOutput); 

     try { 
      response = httpclient.execute(httpget); 

      // Examine the response status 
      Log.i("Praeda",response.getStatusLine().toString()); 

      // Get hold of the response entity 
       HttpEntity entity = response.getEntity(); 

      // If the response does not enclose an entity, there is no need 
      // to worry about connection release 

      if (entity != null) { 

       // A Simple JSON Response Read 
       instream = entity.getContent(); 
       result= convertStreamToString(instream); 

       // now you have the string representation of the HTML request 


      } 

      myOutWriter.write(result); 
      instream.close(); 
      myOutWriter.close(); 
       fileOutput.close(); 

      //catch some possible errors... 


      } catch (Exception e) { 
        e.printStackTrace(); 
     } finally { 

     } 


    //catch some possible errors... 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } finally { 
    } 

} 


    private static String convertStreamToString(InputStream is) 
    { 
    /* 
    * To convert the InputStream to String we use the BufferedReader.readLine() 
    * method. We iterate until the BufferedReader return null which means 
    * there's no more data to read. Each line will appended to a StringBuilder 
    * and returned as String. 
    */ 

     BufferedReader reader = new BufferedReader(new InputStreamReader(is)); 
     StringBuilder sb = new StringBuilder(); 

     String line = null; 
     try { 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
     } catch (IOException e) { 
       e.printStackTrace(); 
     } finally { 
       try { 
        is.close(); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } 
     } 
     return sb.toString(); 

    } 

가 여기에 로그 캣 출력입니다 :

<?xml version="1.0" encoding="utf-8"?> 
    <manifest xmlns:android="http://schemas.android.com/apk/res/android" 
     package="com.gmail.tenglish7.lae" 
     android:versionCode="1" 
     android:versionName="1.0" > 

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

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

     <uses-sdk 
      android:minSdkVersion="14" 
      android:targetSdkVersion="17" /> 



     <application 
      android:allowBackup="true" 
      android:icon="@drawable/ic_launcher" 
      android:label="@string/app_name" 
      android:theme="@style/AppTheme" > 
      <activity 
       android:name="com.gmail.tenglish7.lae.MainActivity" 
       android:label="@string/app_name" > 
       <intent-filter> 
        <action android:name="android.intent.action.MAIN" /> 

        <category android:name="android.intent.category.LAUNCHER" /> 
       </intent-filter> 
      </activity> 
     </application> 

    </manifest> 

어떤 도움이나 제안을 주시면 감사하겠습니다 :

W/ActivityManager(278): Unbind failed: could not find connection for android.os.BinderProxy@40f82428 


    W/System.err(720): android.os.NetworkOnMainThreadException 
    W/System.err(720): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 
    W/System.err(720): at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 
    W/System.err(720): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
    W/System.err(720): at java.net.InetAddress.getAllByName(InetAddress.java:214) 
    W/System.err(720): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 
    W/System.err(720): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
    W/System.err(720): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
    W/System.err(720): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
    W/System.err(720): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
    W/System.err(720): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
    W/System.err(720): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
    W/System.err(720): at com.gmail.tenglish7.lae.MainActivity$UpdateFragment.downloadFile(MainActivity.java:506) 
    W/System.err(720): at com.gmail.tenglish7.lae.MainActivity$UpdateFragment.myClick(MainActivity.java:466) 
    W/System.err(720): at com.gmail.tenglish7.lae.MainActivity$UpdateFragment$1.onClick(MainActivity.java:448) 
    W/System.err(720): at android.view.View.performClick(View.java:4204) 
    W/System.err(720): at android.view.View$PerformClick.run(View.java:17355) 
    W/System.err(720): at android.os.Handler.handleCallback(Handler.java:725) 
    W/System.err(720): at android.os.Handler.dispatchMessage(Handler.java:92) 
    W/System.err(720): at android.os.Looper.loop(Looper.java:137) 
    W/System.err(720): at android.app.ActivityThread.main(ActivityThread.java:5041) 
    W/System.err(720): at java.lang.reflect.Method.invokeNative(Native Method) 
    W/System.err(720): at java.lang.reflect.Method.invoke(Method.java:511) 
    W/System.err(720): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
    W/System.err(720): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
    W/System.err(720): at dalvik.system.NativeStart.main(Native Method) 

가 여기 내 Manifest.xml 파일의

여기 내 코드입니다. 미리 감사드립니다.

Answer 1

메인 스레드에서 네트워크 관련 작업을 수행하려고하면 Android에서 예외가 발생합니다. AsyncTask에서 downloadFile 방법으로 전화하십시오. 문제를 해결할 것입니다.

class FileDownloadTask extends AsyncTask<String, Void, Void>{ 

    @Override 
    protected Void doInBackground(String... params) { 
     downloadFile(params[0]); 
     return null; 
    } 
} 

다음 코드를 사용하여 파일을 다운로드 할 수 있습니다.

new FileDownloadTask().execute(url);