Open the file you saved from the Module Three assignment in Android Studio, then edit the MainActivity

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Open the file you saved from the Module Three assignment in Android Studio, then edit the MainActivity.java file.

Specifically, you must address the following rubric criteria:

• Create a function that displays a greeting. In  Android Studio, create a new public function named “SayHello()” that  returns a void. The function will need to accept a View as a parameter.  Within the function, ensure that it displays a message and check that  the contents of nameText are not null.
• Create validation of the elements and inputs. To complete this task you must do all of the following: 
  • If the content of nameText is not null, write "Hello" and the contents of nameText to textGreeting.
  • If the content of nameText is null, write "You must enter a name" to textGreeting.
  • On activity_main.xml, set the “onClick of buttonSayHello” to “SayHello()”.
• Dynamically enable and disable the button for appropriate situations. For buttonSayHello, the following pattern should be created: 
  • Dynamically disable buttonSayHello if there is no text in nameText.
  • Dynamically enable buttonSayHello when text is entered in nameText.