从Android上传图像到php服务器得到错误

Question

我想从android上传一张图片desert.png到php服务器，但它不适合我，它给了我这个错误日志： E /错误：（1450）：/desert.png：打开失败：EROFS（只读文件系统） 这是我的代码：

/** 
* Background Async Task to upload file 
* */ 
class UploadFileToURL extends AsyncTask<String, String, String> { 

    /** 
    * Before starting background thread 
    * Show Progress Bar Dialog 
    * */ 
    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     showDialog(progress_bar_type); 
    } 

    /** 
    * Uploading file in background thread 
    * */ 
    @Override 
    protected String doInBackground(String... f_url) { 
     int count; 
     try { 
      URL url = new URL(f_url[0]); 
      URLConnection conection = url.openConnection(); 
      conection.connect(); 
      // this will be useful so that you can show a tipical 0-100% progress bar 
      int lenghtOfFile = conection.getContentLength(); 
      Log.i("lenghtOfFile",lenghtOfFile+""); 
      // download the file 
      InputStream input = new BufferedInputStream(url.openStream(), 8192); 
      Log.i("InputStream","InputStream"); 
      // Output stream 
      OutputStream output = new FileOutputStream("desert.png"); 
      Log.i("OutputStream","OutputStream"); 
      Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.desert);   
      ByteArrayOutputStream stream = new ByteArrayOutputStream(); 
      bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream); //compress to which format you want. 
      byte [] byte_arr = stream.toByteArray(); 

      byte data[] = new byte[1024]; 

      long sentByte = 0; 
      while ((count = input.read(byte_arr)) != -1) { 
       output.write(byte_arr, 0, count); 
       sentByte += count; 


       // passed=passedTime -previosTime ; 
       // previosTime = passed ; 

       // publishing the progress.... 
       // After this onProgressUpdate will be called 
       publishProgress(""+(int)((sentByte*100)/lenghtOfFile)); 
       Log.i("log_lenghtOfFile",lenghtOfFile+""); 
       Log.i("log_total",sentByte+""); 
       Log.i("log_ourcentage",(int)((sentByte*100)/lenghtOfFile)+""); 

       // Log.i("log_Debit",passedTime +""); 
       // writing data to file 
       output.write(data, 0, count); 
      } 
      // flushing output 
      output.flush(); 

      // closing streams 
      output.close(); 
      input.close(); 

     } catch (Exception e) { 
      Log.e("Error: ", e.getMessage()); 
     } 



     return null; 
    } 

    /** 
    * Updating progress bar 
    * */ 
    protected void onProgressUpdate(String... progress) { 
     // setting progress percentage 
     pDialog.setProgress(Integer.parseInt(progress[0])); 
    } 

    /** 
    * After completing background task 
    * Dismiss the progress dialog 
    * **/ 
    @Override 
    protected void onPostExecute(String file_url) { 
     // dismiss the dialog after the file was downloaded  
     dismissDialog(progress_bar_type); 

     // Displaying downloaded image into image view 
     // Reading image path from sdcard 
    // String imagePath = Environment.getExternalStorageDirectory().toString() + "/downloadedfile.jpg"; 
     // setting downloaded into image view 
    // my_image.setImageDrawable(Drawable.createFromPath(imagePath)); 
    } 

} 

Answer 1

可能是你可以按照从AndroidExample。另外一个很好的教程here此链接。不要害怕代码，这些是你需要遵循的一些约定上传图像