Android page switching and execution order of common methods

Package com.example.android.active;import android.os.bundle;import android.app.activity;import  android.content.intent;import android.view.menu;import android.view.view;/** * @ 7 methods and four-state  * */public class MainActivity  in the life cycle of deprecated   activity Extends activity {/** * activity is created when called  *  can initialize UI components in this method  *  The method call is complete and calls the OnStart () method  * */     @Override     protected  Void oncreate (bundle savedinstancestate)  {         Super.oncreate (savedinstancestate);         setcontentview ( R.layout.activity_main);         system.out.println (" Mainactivity-oncreate () ");     }    /**     *   is called by OnCreate (), at this time the activity courseware, but cannot be manipulated      *  the method calls the Onresume () or OnStop () method      * */     @Override     protected void onstart ()  {    // TODO  Auto-generated method stub    super.onstart ();     System.out.println ("Mainactivity-onstart ()");    }   /**     *  called when an activity in the stop state gets focus again     *  the method calls the OnStart method      *     *     * */     @Override     protected void onrestart ()  {    // TODO  Auto-generated method stub    super.onrestart ();     System.out.println ("Mainactivity-onrestart ()");    }    /**      *  called by OnStart (), the activity is visible and interactive,     *  at this time, activity is active (Running) state       *      * */     @Override      Protected void onresume ()  {    super.onresume ();     System.out.println ("Mainactivity-onresume ()");    }    /**      *  when activity is in the running state, overridden by other activity (bit-full override call)      *  Activity is paused, loses focus, is not operational      *  activity can be killed in this state       *  If the user returns to the activity, the Onresume method is called and the focus is retrieved again      * */      @Override     protected void onpause ()  {    //  todo auto-generated method stub    super.onpause ();     system.out.println ("MainactivitY-onpause () ");    }    /**     *  Called when activity is completely overwritten by another activity      *  activity goes into a stopped state, completely invisible       *  the activity can be killed in this state      *  when the user returns to the activity, the restart method is called      *      *      *  */     @Override     protected void onstop ()  {     // TODO Auto-generated method stub     Super.onstop ();     system.out.println ("Mainactivity-onstop ()");     }     /**     *  called when the activity invokes the finish method or is destroyed by the system       *  can do the work of releasing resources in this method      * */    @ Override    protected void&nbSp;ondestroy ()  {    // TODO Auto-generated method stub     super.ondestroy ();     system.out.println ("MainActivity-onDestory ()");     }     @Override     public boolean  Oncreateoptionsmenu (Menu menu)  {        // inflate  the menu; this adds items to the action bar if it  is present.        getmenuinflater (). Inflate (R.menu.main,  menu);        return true;    }     /**     *  Use this method to jump to the Activity2 interface */    public  void gotoactivity2 (view v) {    //creates an intent     intent  intent=new intent (This,mainacTivity2.class);     //start another activity    startactivity (intent);     }    }

Package com.example.android.active;import android.app.activity;import android.os.bundle;import  android.view.Menu;public class MainActivity2 extends Activity{/** *  When activity is created, call  *  can initialize the UI component in the method  *  the method call is finished calling the OnStart () method  * */      @Override     protected void oncreate (bundle savedinstancestate)   {        super.oncreate (savedinstancestate);         setcontentview (R.layout.activity_main);         system.out.println ("Mainactivity2-oncreate ()");     }    /**      *  is called by OnCreate (), at this time the activity courseware, but cannot be manipulated      *  The method calls the Onresume () or OnStop () method      * */     @Override      protected void&Nbsp;onstart ()  {    // TODO Auto-generated method stub     super.onstart ();     system.out.println ("Mainactivity2-onstart ()");     }   /**    *  called when an activity in the stop state acquires focus again      *  the method calls the OnStart method     *     *      * */     @Override     protected void  Onrestart ()  {    // TODO Auto-generated method stub     super.onrestart ();     system.out.println ("Mainactivity2-onrestart ()");     }    /**     *  is called by OnStart (), The activity is visible interactively,     *  at this point, the activity is in the active (Running) state      *       * */     @Override     protected void onresume ()  {     super.onresume ();     system.out.println ("MainActivity2-onResume ()" );    }    /**     *  when the activity is in a running state, Overridden by other activity (full-bit override call)      *  activity is paused, loses focus, not operational       *  the activity can be killed in this state      *  if the user returns to the activity, then the Onresume method is called and the focus is retrieved again      * */     @Override     protected  void onpause ()  {    // todo auto-generated method stub     super.onpause ();     system.out.println ("MainActivity2-onPause ()");     }    /**     *  Called when the activity is completely overwritten by another activity      *  This activity goes to a stop state, completely invisible      *  activity can be killed in this state       *  when the user returns to activity, the restart method is called      *       *      * */     @Override      protected void onstop ()  {    // todo auto-generated  method stub    super.onstop ();     system.out.println (" Mainactivity2-onstop () ");     }    /**     *   Called when activity invokes the finish method or is destroyed by the system      *  can be used to release resources in the method       * */     @Override     protected void  OnDestroy ()  {    // TODO Auto-generated method stub     super.ondestroy ();    system.out.println ("Mainactivity2s-ondestory ()");    }      @Override     public boolean oncreateoptionsmenu (menu menu)  {         // Inflate the menu; this adds  items to the action bar if it is present.         getmenuinflater (). Inflate (R.menu.main, menu);         return true;    }}

File configuration

 <application        android:allowbackup= "true"          android:icon= "@drawable/ic_launcher"          android:label= "@string/app_name"         android:theme= "@ Style/apptheme " >        <activity             android:name= "Com.example.android.active.MainActivity"              android:label= "@string/app_name"  >             <intent-filter>                 <action android: Name= "Android.intent.action.MAIN"  />                  <category android:name= "Android.intent.category.LAUNCHER"  />             </intent-filter>         </activity>                                   <activity            android:name= ". MainActivity2 "                   >          </activity>     </application>

<relativelayout xmlns:android= "Http://schemas.android.com/apk/res/android"      xmlns:tools= "Http://schemas.android.com/tools"     android:layout_width= "Match_parent"     android:layout_height= "Match_parent"     android:paddingbottom= "@ Dimen/activity_vertical_margin "    android:paddingleft=" @dimen/activity_horizontal_margin "     android:paddingright= "@dimen/activity_horizontal_margin"      android:paddingtop= "@dimen/activity_vertical_margin"     tools:context= ". Mainactivity " >    <TextView         Android:id= "@+id/textview1"         android:layout_width= "Wrap_content"         android:layout_height= "Wrap_content"          android:text= "@string/hellO_world " />    <button        android: Id= "@+id/button1"         style= "Android:attr/buttonstylesmall"          android:layout_width= "Wrap_content"          android:layout_height= "Wrap_content"         android: layout_below= "@+id/textview1"         android:layout_marginleft= "15DP"         android:layout_margintop= "32DP"          android:layout_torightof= "@+id/textview1"          Android:text= "Start the second activity"          android:onclick= " GotoActivity2 "/></relativelayout>

Run the project

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After you click Start a second activity

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When you click the Back button

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This article is from the "matengbing" blog, make sure to keep this source http://matengbing.blog.51cto.com/11395502/1880918

Android page switching and execution order of common methods