Android 二維碼掃描怎樣實現第二次重復掃描

掃描出現問題事彈出dialog，當用戶點擊確定按鈕後重新開始掃描。private void showErrorDialog() {closeCamera();viewfinderView.setVisibility(View.GONE);AlertDialog.Builder builder = new AlertDialog.Builder(this);builder.setTitle(getString(R.string.app_name));builder.setMessage("掃描確認出錯，請重新掃描櫃子上的二維碼！");builder.setPositiveButton(android.R.string.ok, new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {restartCamera();}});builder.setOnCancelListener(new OnCancelListener() {@Overridepublic void onCancel(DialogInterface dialog) {CaptureCodeActivity.this.finish();}});builder.show();}