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Android Build a Simple Android App Basic Android Programming Choosing a Random Fact

Diego Marrs
Diego Marrs
8,243 Points
Posted by Diego Marrs
Diego Marrs
8,243 Points

Questions.

Hello,

When you create a new project in android studio, you start with a function called 'onCreate'.

1. Does this mean that everything written under this will only happen when they're first created?

Also:

public void onClick(View v)

2. What does 'View v' do?

Thanks!

2 Answers

Kourosh Raeen
Kourosh Raeen
23,733 Points
Kourosh Raeen
Kourosh Raeen
23,733 Points

Hi Diego - The onCreate() callback method gets automatically called at the beginning of an activity's lifecycle, when the activity is launched but before it is visible. This is where you wire up the UI. If the activity gets killed and is going to get recreated, for example after an orientation change, then onCreate() gets called again. For more information take a look at this video from the Android Activity Lifecycle course: https://teamtreehouse.com/library/android-activity-lifecycle/the-activity-lifecycle/activity-lifecycle-overview

Regarding your second question, v is a reference to the view that was clicked, such as a button, etc.

Diego Marrs
Diego Marrs
8,243 Points
Diego Marrs
Diego Marrs
8,243 Points

Thanks!

If you can, could you also help me with the first question?