将图像从android发送到php服务器

Question

我对这段代码有很大的问题。我的目标是通过php将图像（存储在我的SD卡中）发送到我的服务器。这是代码。我也使用过这4个库

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.Base64;
import com.loopj.android.http.RequestParams; 



public void mytry(){

String fileName = Environment.getExternalStorageDirectory() + "/myImage.png";
String fileNameSegments[] = imgPath.split("/");
fileName = fileNameSegments[fileNameSegments.length - 1];
params.put("filename", fileName);
if (imgPath != null && !imgPath.isEmpty()) {
     encodeImagetoString();
}
     else {
         Log.v("NO","no File");
     }
}

public void encodeImagetoString() {
new AsyncTask<Void, Void, String>() {

    protected void onPreExecute() {

    };

    @Override
    protected String doInBackground(Void... params) {
        BitmapFactory.Options options = null;
        options = new BitmapFactory.Options();
        options.inSampleSize = 3;
        bitmap = BitmapFactory.decodeFile(imgPath,
                options);
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        // Must compress the Image to reduce image size to make upload easy
        bitmap.compress(Bitmap.CompressFormat.PNG, 50, stream); 
        byte[] byte_arr = stream.toByteArray();
        // Encode Image to String
        encodedString = Base64.encodeToString(byte_arr, 0);
        return "";
    }

    @Override
    protected void onPostExecute(String msg) {
        Log.v("OK","Calling Upload");
        // Put converted Image string into Async Http Post param
        params.put("image", encodedString);
        // Trigger Image upload
        triggerImageUpload();
    }
}.execute(null, null, null);
}

public void triggerImageUpload() {
    makeHTTPCall();
}

public void makeHTTPCall() {
    AsyncHttpClient client = new AsyncHttpClient();

    client.post("http://mywebsite.com/phppage.php", params, new AsyncHttpResponseHandler() {

            @Override
                public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e)  {
                Log.v("Fail","Epic fail");
                // TODO Auto-generated method stub
                // When Http response code is '404'
                if (statusCode == 404) {
                   Log.v("NO","Requested resource not found");

                }
                // When Http response code is '500'
                else if (statusCode == 500) {
                     Log.v("NO","Something went wrong at server end");
                }
                // When Http response code other than 404, 500
                else {

                     Log.v("NO","Error Occured \n Most Common Error: \n1. Device not connected to Internet\n2. Web App is not deployed in App server\n3. App server is not running\n HTTP Status code : "
                                    + String.valueOf(statusCode));
                }
            }

            @Override
            public void onSuccess(int statusCode, Header[] headers, byte[] response)  {
                // TODO Auto-generated method stub
                // Hide Progress Dialog
                Log.v("Yeah",String.valueOf(statusCode));
                Log.v("Yeah",String.valueOf(headers));
                Log.v("Yeah",String.valueOf(response));
            }


        });
}

这里是php代码：

<?php

$filename = $_REQUEST['filename'];


$base=$_REQUEST['image'];
$binary=base64_decode($base);
header('Content-Type: image/png; charset=utf-8');

$file = fopen("uploads/".$filename, 'wb');


fwrite($file, $binary);
fclose($file);

?>

当我运行我的应用程序时，我得到“成功”（响应200等等），但我的php页面看起来确实收到了任何内容。我已经花了两天时间。

提前谢谢