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Robert Bilic6,155 Points
The Activity Lifecycle
Inside the 'onCreate()' method of MainActivity, add a line of code to execute the 'onCreate()' method of the parent, or superclass, of this MainActivity class. Don’t forget to pass along the parameter, and call it before the 'aString' variable is set!
Adam SackfieldPro Student 19,663 Points
At least give some people some kind of effort on your own part to do the questions. Don't just copy them to the forum and expect people to tell you the answers without you trying yourself. That's not the way you are going to learn and understand the principles.
Also you could have added these 3 posts into 1.