Question

I would like to do some action only once, when the app starts.
Therefore, I tried to place the code within the main acitivity’s onCreate, but this is triggered again and again when the user comes back to the main activity and/or when the device orientation changes.
Which event fits better for my use-case?

Answer 1

write the code in application level.

Class MyClass extends Application
   {
    @Override
    public void onCreate() {
           //your code. This will be executed only once.i.e. when app is started.

           super.onCreate();
     }
   }

You need to declare this class in androidmanifest.xml also .As shown

<application
    android:name=".MyClass"
    android:icon="@drawable/logo"
    android:label="@string/str_app_name"
    android:theme="@android:style/Theme.NoTitleBar" 
    >