How to development a Android App

Before you begin, Let’s talk about Android lifecycle first . Learn about Android’s four major components,And to be familiar with Android development tool -Android Studio.

Activity

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Activity1->Activity2: onCreate()——>onStart()——>onResume()
Note left of Activity2: 第一个 Pause，第二个Create，Start，Resume。第一个 Stop
Activity2-->Activity1: back to the activity1
Note left of Activity2: 暂停，restart第一个，start，resume,第二个stop,destory.

when you push a new Activity or back Activity, it’s due to the stack to manage the Activity status, but how to push a new Activity?

Intent intent = new Intent(ReorderFour.this, ReorderTwo.class);    

intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);

startActivity(intent);