How to show custom layout alert dialog at center vertical position

Question

I want to display custom dialog at center vertical position but it appears at top.Above the first one is my xml file and second one is output after running in real device. Here is the code of dialog.

    //alert dialog code
    //add theme to display on whole page
    AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this,      
    android.R.style.Theme_Holo_Light_NoActionBar_TranslucentDecor);
    LayoutInflater inflater = this.getLayoutInflater();
    //custom layout
    View dialogView = inflater.inflate(R.layout.custom_bar, null);
    dialogBuilder.setView(dialogView);

    //button to close dialog box
    Button closeButton = (Button)     
    dialogView.findViewById(R.id.closeButton);
    final AlertDialog alertDialog = dialogBuilder.create();
    closeButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            alertDialog.dismiss();
        }
    });
    //show dialog
    alertDialog.show();

Answer 1

In your main layout of custom_bar put android:gravity="center"

Answer 2

You should write like this.

AlertDialog dialog = new AlertDialog.Builder(this, R.style.Dark).create();
                        if (dialog.getWindow() != null)
                        {
                            Window window = dialog.getWindow();
                            window.setLayout(WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT);
                            window.setGravity(Gravity.CENTER);
                            dialog.getWindow().setBackgroundDrawableResource(android.R.color.background_dark);
                        }

This will show the alert dialog to the center of the screen.