The life cycle of android--activity

One, the demo Test activity life cycle

write two activity:

Package Com.example.activity_04;import Android.os.bundle;import Android.app.activity;import android.content.Intent ; Import Android.view.menu;import Android.view.view;import Android.view.view.onclicklistener;import    Android.widget.button;public class Firstactivity extends Activity {private Button mybutton=null;        @Override protected void OnCreate (Bundle savedinstancestate) {System.out.println ("firstactivity-->oncreate");        Super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_first);        mybutton= (Button) Findviewbyid (R.id.mybutton);    Mybutton.setonclicklistener (New Btnclick ()); } class Btnclick implements onclicklistener{@Overridepublic void OnClick (View arg0) {//TODO self-generated method stub intent Intent=n EW Intent (); Intent.setclass (Firstactivity.this,secondactivity.class);            FirstActivity.this.startActivity (intent);} } @Override Public boolean Oncreateoptionsmenu (Menu menu) {//Inflate the menu, this adds items to the action BaR if it is present.        Getmenuinflater (). Inflate (R.menu.first, menu);    return true; } @Overrideprotected void Onrestart () {//TODO self-generated method stub System.out.println ("Firstactivity-->onrestart"); Super.onrestart ();} @Overrideprotected void OnDestroy () {//TODO self-generated method stub System.out.println ("Firstactivity-->ondestroy"); Super.ondestroy ();} @Overrideprotected void OnPause () {//TODO self-generated method stub System.out.println ("Firstactivity-->onpause"); Super.onpause ();} @Overrideprotected void Onresume () {//TODO self-generated method stub System.out.println ("Firstactivity-->onresume"); Super.onresume ();} @Overrideprotected void OnStart () {//TODO self-generated method stub System.out.println ("Firstactivity-->onstart"); Super.onstart ();} @Overrideprotected void OnStop () {//TODO self-generated method stub System.out.println ("Firstactivity-->onstop"); Super.onstop ()        ;} }

Package Com.example.activity_04;import Android.app.activity;import Android.os.bundle;public class SecondActivity Extends Activity {@Overrideprotected void onCreate (Bundle savedinstancestate) {//TODO self-generated method stub System.out.println (" Secondactivity--->oncreate "); Super.oncreate (savedinstancestate);} @Overrideprotected void OnDestroy () {//TODO self-generated method stub System.out.println ("Secondactivity--->ondestroy"); Super.ondestroy ();} @Overrideprotected void OnPause () {//TODO self-generated method stub System.out.println ("Secondactivity--->onpause"); Super.onpause ();} @Overrideprotected void Onrestart () {//TODO self-generated method stub System.out.println ("Secondactivity--->onrestart"); Super.onrestart ();} @Overrideprotected void Onresume () {//TODO self-generated method stub System.out.println ("Secondactivity--->onresume"); Super.onresume ();} @Overrideprotected void OnStart () {//TODO self-generated method stub System.out.println ("Secondactivity--->onstart"); Super.onstart ();} @Overrideprotected void OnStop () {///TODO self-generated method stub System.out.println ("SecOndactivity--->onstop "); Super.onstop ();}} 

Then start the program,

Be able to see the method that the first activity is called on.

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called the first time it is created, can be configured with the Layout file	when Ac tivity when we can see it.	when Activity be called when the user focus is available

Then click on the button on the first activiyt to jump to the second activity:

The OnPause method that finds the first activity is called, followed by the initialization of a new method that the activity is called, and the first activity's OnStop method is called after the second activity appears.

onpause	< Span style= "FONT-FAMILY:CALIBRI;" >on
Application launches another activity activity pause method : usually save current activity &NBSP;	when Activity The first one is called when it is not visible Activity of the Onstop method, assuming that the new Activity not completely obscuring the first one . Activity , you do not call

Then click Backbutton,

Note that the Onrestart method is called first after the first activity is started.

on Destory	on Restart
destroyed Activity This method is called in two general cases: 1 , calling Activity of the Finish Method 2 when the system resources are not available	Call Again Paused Activity

Summary:

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The life cycle of the activity call feels similar to the. NET inside page life cycle. It feels simpler than that.

The life cycle of android--activity