Loading Dialog code in android studio

private Dialog loadingDialog;

=> 

loadingDialog = new Dialog(this);

loadingDialog.setContentView(R.layout.loading);
loadingDialog.getWindow().setBackgroundDrawable(getDrawable(R.drawable.rounded_corners));
loadingDialog.getWindow().setLayout(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);
loadingDialog.setCancelable(false);

loadingDialog.show();
loadingDialog.dismiss();

=>