View qrcode_view = this.getLayoutInflater().inflate(R.layout.taskdetail_qrcode,null);

                final PopupWindow qrcodePop = new PopupWindow(qrcode_view,getWindowManager().getDefaultDisplay().getWidth(),getWindowManager().getDefaultDisplay().getHeight());

                //qrcodePop.showAsDropDown(v);

                qrcodePop.showAtLocation(v,Gravity.CENTER,Gravity.FILL_HORIZONTAL,Gravity.FILL_VERTICAL);

                ImageView qrcode = (ImageView)qrcode_view.findViewById(R.id.qrcode_image);

                int qr_width = BitmapUtil.Dp2Px(this,200);

                qrcode.setImageBitmap(QRCodeUtil.createImage(globalVal.BASE_URL+"/"+taskInfo.task_id,qr_width,qr_width));

                qrcode_view.findViewById(R.id.close_qrcode).setOnClickListener(

                        new View.OnClickListener() {

                            @Override

                            public void onClick(View v) {

                                qrcodePop.dismiss();

                            }

                        }

                );