This video shows how to create a simple Notes App in Sketchware.
The code used to add EditText in Dialog Box is:
final EditText edittext1 = new EditText(MainActivity.this);
edittext1.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
edittext1.setHint("Fruit name");
android.support.design.widget.TextInputLayout textinput1 = new android.support.design.widget.TextInputLayout(MainActivity.this);
textinput1.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
textinput1.addView(edittext1);
dialog_add.setView(textinput1);