How to show/hide the Android Soft Keyboard in dialog?

Use following code to hide keyboard

this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

Use following code to show keyboard

this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);

on click of ok button write the below code:-

  final Dialog dialog=new Dialog(this);
    dialog.setContentView(R.layout.dialog);
    final EditText text = (EditText) dialog.findViewById(R.id.nameField);

   Button mOkBtn=(Button)dialog.findViewById(R.id.okBtn);


    // if button is clicked, close the custom dialog
   mOkBtn.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            InputMethodManager imm = (InputMethodManager)getSystemService(context.INPUT_METHOD_SERVICE);
           imm.hideSoftInputFromWindow(text.getWindowToken(), 0);
        }
    });

    dialog.show();

Define context as Context context=this.

final Dialog dialog = new Dialog(_context);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

dialog.setContentView(R.layout.prompts);
dialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);

final EditText name = (EditText) dialog.findViewById(R.id.name);
final EditText add = (EditText) dialog.findViewById(R.id.add);

Button btnok = (Button) dialog.findViewById(R.id.btn_ok);
Button btncancel = (Button) dialog.findViewById(R.id.btn_cancel);

 btnAddExpList.setOnClickListener(new OnClickListener() {
  @Override
   public void onClick(View v) {           dialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);  
   }
 }

Use this function:

public void hideKeyboard() {
    if (getDialog().getCurrentFocus() != null) {
        InputMethodManager inputManager = (InputMethodManager) Objects.requireNonNull(getActivity()).getSystemService(Context.INPUT_METHOD_SERVICE);
        inputManager.hideSoftInputFromWindow(getDialog().getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
    }
}

I wish it be useful