将base64图像发布到android中的php服务器

我正在开发一个模块，用户可以在其中将图像上传到服务器。为此，我必须将所选图像更改为 Base64。转换后，我必须使用 Json POST 方法上传图像，但每次应用程序崩溃并且 Logcat 都会出现此错误

Error converting result java.lang.NullPointerException: lock == null

另一行错误是

Error parsing data org.json.JSONException: End of input at character 0 of 

这是我正在尝试的代码，请看一下，让我看看我在这里犯了什么错误。

    buttonLoadPicture.setOnClickListener( new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            Intent i = new Intent(
                    Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

                    startActivityForResult(i, RESULT_LOAD_IMAGE);
        }
    });

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
        Uri selectedImage = data.getData();
        String[] filePathColumn = { MediaStore.Images.Media.DATA };

        Cursor cursor = getContentResolver().query(selectedImage,
                filePathColumn, null, null, null);
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        String picturePath = cursor.getString(columnIndex);
        cursor.close();

        ImageView imageView = (ImageView) findViewById(R.id.imgView);
        imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));

        ss = BitmapFactory.decodeFile(picturePath);
        Log.d("value", ss.toString());


        ByteArrayOutputStream baos = new ByteArrayOutputStream();  
        ss.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        byte[] b = baos.toByteArray();
        String imageEncoded = Base64.encodeToString(b,Base64.DEFAULT);

        encodedImage = imageEncoded.toString();

        Log.e("LOOK", imageEncoded); // **working proper**
        Log.e("encodedImage", encodedImage);// **working proper**

       new PostImage().execute();

    }
}

class PostImage extends AsyncTask<String, String, String>{

    @SuppressWarnings("deprecation")
    @Override
    protected String doInBackground(String... args) {

        // TODO Auto-generated method stub

        String encodedString = encodedImage.toString();

        Log.d("stringgggg", encodedString);//**working proper**

     List<NameValuePair> params = new ArrayList<NameValuePair>();

        params.add(new BasicNameValuePair("uploaded_file", encodedString));
        String uri = "http://192.168.2.166/uploadimage/upload.php";         
        JSONObject json = jsonParser.makeHttpRequest(uri,"POST",params);

        Log.d("valueeeeee", json.toString());// **Crashhhh!!!!!**
        return json.toString();
    }
}

}

这是我的 php 代码

<?php

    $json["success"] = 1; $json["message"] = "YOU ARE HERE... UPLOAD.PHP";

    $json['image']=$_FILES['uploaded_file']['name'];
    $json['tmp_name']=$_FILES['uploaded_file']['tmp_name'];
    echo json_encode($json);

    die();
    //print_r($_FILES); die();
    $file_path = "uploads/";

    $file_path = $file_path . basename( $_FILES['uploaded_file']['name']);
    if(move_uploaded_file($_FILES['uploaded_file']['tmp_name'], $file_path)) {
        //echo "success";
         $json["success"] = 1; $json["message"] = "Successfully post save"; 
    } else{
       // echo "fail";
         $json["success"] = 0; $json["message"] = "Fail post save"; 
    }

    // print_r($json);
    // var_dump(json_encode($json));
    echo json_encode($json);
?>

请将编码值分配给使用的参数

     encodedString = Base64.encodeToString(b,Base64.DEFAULT);
      Log.e("LOOK", encodedString);

      new PostImage().execute(encodedString);