How can I manage simultaneous activities in Android?

How can I improve the performance of simultaneous processes with regard to execution tim开发者_JAVA技巧e and memory consumption in Android?

In Android activities are managed by using tintent. Here is the sample code how you can create and use Intent,

Intent intent = new Intent(Mainactivity.this, secondactivity .class)
start activity(intent);

By this you will be able to move from one to the other activity.