Android popup 输入文本框

Button btnManual = (Button) findViewById(R.id.btnManual);
btnManual.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(ResultActivity.this);
        alertDialog.setTitle("Ticket number");
        alertDialog.setMessage("Enter ticket number");


        final EditText txtManualTicketNo = new EditText(ResultActivity.this);
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.MATCH_PARENT);
        txtManualTicketNo.setLayoutParams(lp);
        alertDialog.setView(txtManualTicketNo);
        //alertDialog.setIcon(R.drawable.);


        alertDialog.setPositiveButton("Validate",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        EditText scanningText = (EditText) findViewById(R.id.txtTicketScanningInfo);
                        scanningText.setText(txtManualTicketNo.getText());
                        validate();
                    }
                });


        alertDialog.setNegativeButton("Close",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                });
        alertDialog.show();
    }
});