I understand how to set the value of a edit box in WebView, and in a browser on PC with Javascript.
It is basically first find out the ID of the edit box (text), then s
Use the setText() function of TextView as in:
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
Where 'message' is a String variable, this will put the value of message into the textView box replacing anything that was in there previously. I got this example from the code at the bottom of this page https://developer.android.com/training/basics/firstapp/starting-activity.html
EditText uses the same setText() method