從外部存儲android的txt文件傳輸。應用程序粉碎

我需要通過WI-FI Direct傳輸txt文件。事情是，應用程序開始傳輸後（在客戶端（那一個，傳輸））一直壓榨）。 Wi-Fi Direct沒有問題，因爲我可以毫無問題地發送字符串等。我相信，這個問題是與閱讀文件。文件位於空的SD卡上。這裏只有LOST.DIR + Alice_commodities.txt（我需要傳輸的文件）。從外部存儲android的txt文件傳輸。應用程序粉碎

這裏是傳輸類

private class Networking_files_transmit extends AsyncTask<String, Void, Void> 
{ 

    public final int port=8888; 

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

     String ServerIP=params[0]; 
     Socket s=null; 
     OutputStream out=null; 
     Context context = null; 
     BufferedInputStream in=null; 
     FileInputStream fis=null; 


     try { 

      s=new Socket(ServerIP,port); 
      out= s.getOutputStream(); 
     } catch (UnknownHostException e) { 
      Log.e("Files transmission", "Can not find host"); 
      e.printStackTrace(); 
     } catch (IOException e) { 
      Log.e("Files transmission", "Problems with IO"); 
      e.printStackTrace(); 
     } 

     if(s.isConnected()) 
     { 
      int count; 
      byte[] buffer=new byte [1024]; 
      final File myFile=new File (Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + "Alice_commodities.txt"); 
      try { 
       in=new BufferedInputStream(new FileInputStream(myFile)); 
       while((count=in.read(buffer)) > 0) 
       { 
        out.write(buffer, 0, count); 
       } 
      } catch (FileNotFoundException e) { 
       Log.e("Files transmission", "Can not find file"); 
       e.printStackTrace(); 
      } catch (IOException e) { 
       Log.e("Files transmission", "Problems with IO, something wrong with file"); 
       e.printStackTrace(); 
      } 
      try { 
       out.close(); 
       in.close(); 
       s.close(); 
      } catch (IOException e) { 
       Log.e("Files transmission", "Cannot close stream or socket"); 
       e.printStackTrace(); 
      } 


     } 
     else 
     { 
      Log.e("Files transmission", "Socket could not connect"); 

      try { 
       out.close(); 
       in.close(); 
       s.close(); 
      } catch (IOException e) { 
       Log.e("Files transmission", "Cannot close stream or socket"); 
       e.printStackTrace(); 
      } 

     }   
     return null; 
    } 
    protected void onPostExecute(Void result) {   
      super.onPostExecute(result);    
      Toast toast=Toast.makeText(getApplicationContext(), "File transmited", Toast.LENGTH_SHORT); 
      toast.show();      
    } 

}

和類用於接收

private class Networking_input_server_file_receive extends AsyncTask<Void, Void, Void> 
{ 

    public final int port=8888; 
    public long start; 
    public long end; 

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

     ServerSocket ss= null;   
     Socket incoming=null; 
     FileOutputStream fos=null; 
     BufferedOutputStream out=null; 
     InputStream in=null; 

     try { 
      fos = openFileOutput("new.txt", Context.MODE_PRIVATE); 
     } catch (FileNotFoundException e1) { 
      Log.e("FileReceiving", "Could not find a file"); 
      e1.printStackTrace(); 
     } 


     try { 
      ss=new ServerSocket(port); 
      ss.setSoTimeout(20000); 
      incoming= ss.accept(); 


      out = new BufferedOutputStream(fos); 
     } catch (UnknownHostException e) { 
      Log.e("FileReceiving", "Could not find a host"); 
      e.printStackTrace(); 
     } catch (IOException e) { 
      Log.e("FileReceiving", "Problems with IO"); 
      e.printStackTrace(); 
     } 
     if (incoming.isConnected()) 
     { 
      start=System.currentTimeMillis(); 
      byte[] buffer = new byte[1024]; 
      int count; 
      try { 
       in = incoming.getInputStream(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      try { 
       while((count=in.read(buffer)) > 0){ 
        fos.write(buffer, 0, count); 
       } 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      try { 
       end=System.currentTimeMillis(); 
       fos.close(); 
       incoming.close(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

     } 
     else 
     { 
      Log.e("file receiving", "Connection failed"); 
      try { 
       fos.close(); 
       incoming.close(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

     } 

     return null; 
    } 

    protected void onPostExecute(Void result) {   
      super.onPostExecute(result);    
      String s=String.valueOf(end-start); 
      Toast toast=Toast.makeText(getApplicationContext(), s , Toast.LENGTH_SHORT); 
      toast.show();      
    } 

}

和清單的文件

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

<uses-sdk 
    android:minSdkVersion="14" 
    android:targetSdkVersion="17" /> 
<uses-permission android:name="android.permission.INTERNET"/> 
<uses-permission 
    android:required="true" 
    android:name="android.permission.ACCESS_WIFI_STATE"/> 
<uses-permission 
    android:required="true" 
    android:name="android.permission.CHANGE_WIFI_STATE"/> 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> 



<application 
    android:allowBackup="true" 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <activity 
     android:name="com.paad.wifidirect.WiFiDirectActivity" 
     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>

預先感謝您的幫助。

UPD錯誤從發射機

07-09 10:43:32.653 E/AndroidRuntime(12614): FATAL EXCEPTION: AsyncTask #1 
07-09 10:43:32.653 E/AndroidRuntime(12614): java.lang.RuntimeException: An error occured while executing doInBackground() 
07-09 10:43:32.653 E/AndroidRuntime(12614): at android.os.AsyncTask$3.done(AsyncTask.java:278) 
07-09 10:43:32.653 E/AndroidRuntime(12614): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 
07-09 10:43:32.653 E/AndroidRuntime(12614): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 
07-09 10:43:32.653 E/AndroidRuntime(12614): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 
07-09 10:43:32.653 E/AndroidRuntime(12614): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 
07-09 10:43:32.653 E/AndroidRuntime(12614): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208) 
07-09 10:43:32.653 E/AndroidRuntime(12614): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 
07-09 10:43:32.653 E/AndroidRuntime(12614): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 
07-09 10:43:32.653 E/AndroidRuntime(12614): at java.lang.Thread.run(Thread.java:856) 
07-09 10:43:32.653 E/AndroidRuntime(12614): Caused by: java.lang.NullPointerException 
07-09 10:43:32.653 E/AndroidRuntime(12614): at com.paad.wifidirect.WiFiDirectActivity$Networking_files_transmit.doInBackground(WiFiDirectActivity.java:524) 
07-09 10:43:32.653 E/AndroidRuntime(12614): at com.paad.wifidirect.WiFiDirectActivity$Networking_files_transmit.doInBackground(WiFiDirectActivity.java:1) 
07-09 10:43:32.653 E/AndroidRuntime(12614): at android.os.AsyncTask$2.call(AsyncTask.java:264) 
07-09 10:43:32.653 E/AndroidRuntime(12614): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 
07-09 10:43:32.653 E/AndroidRuntime(12614): ... 5 more

來源

2013-07-08 Sparrow_ua

沒有錯誤日誌條目提供應用程序崩潰時提供？ –

對不起，但我不能在模擬器上執行WiFi Direct應用程序。我在真實設備上運行這個應用程序 –

對不起，如果我現在誤解了你，但由於你應該有一個發送設備和一個接收設備，你可以通過USB調試來調試接收設備（錯誤發生的地方）（通過從eclipse/adt/android studio/intellij啓動應用程序）或通過android調試橋捕獲日誌。無論哪種方式，你應該有權訪問logcat輸出。爲adb方式看到這篇文章：http://stackoverflow.com/questions/2882253/how-do-i-get-the-logfile-from-an-android-device –

您可以嘗試在這兩個類的註釋部分Toast日誌，我有幾個問題，同時試圖使用他們的裏面的AsyncTask。

protected void onPostExecute(Void result) {   
      super.onPostExecute(result);    
     // Toast toast=Toast.makeText(getApplicationContext(), "File transmited", Toast.LENGTH_SHORT); 
     // toast.show();      
    }

來源

2013-07-09 12:55:04 Str1101

如果你仍然想提出那個吐司，你應該嘗試在方法** onProgressUpdate **中實現它： 'protected void onProgressUpdate（Integer n）{ if（n == 1）{ToSys.makeText（getApplicationContext（），s，Toast.LENGTH_SHORT）; }' – Str1101

問題不在吐司。問題在於文件路徑和錯誤日誌顯示它。 –

取自API的Environment.getExternalStorageDirectory()？

我錯過了檢查，其目錄可用 - 如果沒有，它可能爲空。如果您在調試過程中將外部存儲設備安裝到操作系統中，則可能會出現這種情況，並且可能是也可能不是您在調試之前/未經調試的錯誤。只要您正在調試，您應該從操作系統卸載外部存儲。

如果可行，則應使用getExternalStoragePublicDirectory作爲文件傳輸目錄，如API註釋中所述。有一個如何創建文件的很好的例子。

來源

2013-07-10 00:19:24

從外部存儲android的txt文件傳輸。應用程序粉碎

回答

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