活动不更新以前的活动TextView

I have created all by myself first app for android. User has to click next activity started button that will open new activity. User will type a text there and the text will be returned to the previous screen. That text will be updated on a textview. Initially the textview will have "No text entered message" and after updating from the activity it will be new text that was entered. I am having the problem that textbox disappears and no message is shown when updated from new activity.I have created all by myself first app for andr