将图像从 android 上传到 php 服务器出现错误

Question

我正在尝试将图片 Desert.png 从 android 上传到 php 服务器，但它对我不起作用，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

也许你可以从AndroidExample点击这个链接。另一个很好的教程here。不要被代码吓到，这些是上传图片需要遵循的一些约定