将压缩的图像上传到PHP服务器

在我的应用程序中，我正在将图像上传到服务器（使用以下代码），我能够成功将图像上传到服务器。我的问题是，如果我上传由相机拍摄的图像，由于图像的大小（1.5-5 MB），它需要很长时间才能上传。我在android中看到了很多压缩方法，但是我找不到应该在代码中使用的压缩方法，因为我是android的新手。我想减少上传时间。有人可以打电话给我如何压缩图像并上传到服务器吗？

public int uploadFile(String sourceFileUri) {


  String fileName = sourceFileUri;

HttpURLConnection conn = null;
DataOutputStream dos = null;  
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024; 
File sourceFile = new File(sourceFileUri); 

if (!sourceFile.isFile()) {

     //dialog.dismiss(); 

     Log.e("uploadFile", "Source File not exist :"+imagepath);

     runOnUiThread(new Runnable() {
         public void run() {
           messageText.setText("Source File not exist :"+ imagepath);
         }
     }); 

     return 0;

}
else
{
     try { 


         // open a URL connection to the Servlet
         FileInputStream fileInputStream = new FileInputStream(sourceFile);
         URL url = new URL(upLoadServerUri);

         // Open a HTTP  connection to  the URL
         conn = (HttpURLConnection) url.openConnection(); 
         conn.setDoInput(true); // Allow Inputs
         conn.setDoOutput(true); // Allow Outputs
         conn.setUseCaches(false); // Don't use a Cached Copy
         conn.setRequestMethod("POST");
         conn.setRequestProperty("Connection", "Keep-Alive");
         conn.setRequestProperty("ENCTYPE", "multipart/form-data");
         conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
         conn.setRequestProperty("uploaded_file", fileName); 

         dos = new DataOutputStream(conn.getOutputStream());

         dos.writeBytes(twoHyphens + boundary + lineEnd); 
         dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""
                                 + fileName + "\"" + lineEnd);

         dos.writeBytes(lineEnd);

         // create a buffer of  maximum size
         bytesAvailable = fileInputStream.available(); 

         bufferSize = Math.min(bytesAvailable, maxBufferSize);
         buffer = new byte[bufferSize];

         // read file and write it into form...
         bytesRead = fileInputStream.read(buffer, 0, bufferSize);  

         while (bytesRead > 0) {

           //dos.write(buffer, 0, bufferSize);
           dos.write(buffer, 0, bytesRead);
           bytesAvailable = fileInputStream.available();
           bufferSize = Math.min(bytesAvailable, maxBufferSize);
           bytesRead = fileInputStream.read(buffer, 0, bufferSize);   

          }

         // send multipart form data necesssary after file data...
         dos.writeBytes(lineEnd);
         dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

         // Responses from the server (code and message)
         serverResponseCode = conn.getResponseCode();
         String serverResponseMessage = conn.getResponseMessage();

         Log.i("uploadFile", "HTTP Response is : " 
               + serverResponseMessage + ": " + serverResponseCode);

         if(serverResponseCode == 200){

             runOnUiThread(new Runnable() {
                  public void run() {
                    //String msg = "File Upload Completed.";
                    //messageText.setText("File Upload Completed.");
                     // Toast.makeText(Messaging.this, "Image Sent Successfully", Toast.LENGTH_SHORT).show();

                         dialog.dismiss();


                      Toast toast = Toast.makeText(Messaging.this, "Image Successfully Shuffled and Sent \n You will be notified once it is solved", Toast.LENGTH_SHORT);
                      toast.setGravity(Gravity.CENTER|Gravity.CENTER, 0, 60);
                      toast.setDuration(Toast.LENGTH_LONG);
                      toast.show();
                  }
              });                
         }    

         //close the streams //
         fileInputStream.close();
         dos.flush();
         dos.close();

    } catch (MalformedURLException ex) {

        //dialog.dismiss();  
        ex.printStackTrace();

        runOnUiThread(new Runnable() {
            public void run() {
              messageText.setText("MalformedURLException Exception : check script url.");
                Toast.makeText(Messaging.this, "MalformedURLException", Toast.LENGTH_SHORT).show();
            }
        });

        Log.e("Upload file to server", "error: " + ex.getMessage(), ex);  
    } catch (Exception e) {

        //dialog.dismiss();  
        e.printStackTrace();

        runOnUiThread(new Runnable() {
            public void run() {
              messageText.setText("Got Exception : see logcat ");
                Toast.makeText(Messaging.this, "Got Exception : see logcat ", Toast.LENGTH_SHORT).show();
            }
        });
        Log.e("Upload file to server Exception", "Exception : "  + e.getMessage(), e);  
    }

    return serverResponseCode; 

 } 
}

提前致谢