3rd Chapter Code

1.

 Public class globalvariables {    publicstatic  UserBean User;}

2.

 Public classGlobalVariablesImplementsSerializable, cloneable {/*** @Fields: Serialversionuid*/    Private Static Final LongSerialversionuid = 1L; Private StaticGlobalVariables instance; Privateglobalvariables () {} Public Staticglobalvariables getinstance () {if(Instance = =NULL) {Object Object=Utils.restoreobject (Appconstants.cachedir+TAG); if(Object = =NULL) {//The first time the app starts, the file does not exist and the newObject =NewGlobalVariables (); Utils.saveobject (Appconstants.cachedir+TAG, object); } instance=(GlobalVariables) object; }        returninstance; }         Public Final StaticString TAG = "GlobalVariables"; PrivateUserBean User;  PublicUserBean GetUser () {returnuser; }     Public voidsetUser (UserBean user) { This. user =user; Utils.saveobject (Appconstants.cachedir+ TAG, This); }        //————— The following 3 methods for serializing ————————     Publicglobalvariables readresolve ()throwsObjectstreamexception, clonenotsupportedexception {instance= (globalvariables) This. Clone (); returninstance; }    Private voidreadobject (ObjectInputStream ois)throwsIOException, ClassNotFoundException {ois.defaultreadobject (); }     PublicObject Clone ()throwsclonenotsupportedexception {return Super. Clone (); }         Public voidReset () {User=NULL; Utils.saveobject (Appconstants.cachedir+ TAG, This); }}

3.

     Public Static Final voidsaveobject (String path, Object saveobject) {FileOutputStream fos=NULL; ObjectOutputStream Oos=NULL; File F=NewFile (path); Try{fos=NewFileOutputStream (f); Oos=NewObjectOutputStream (FOS);        Oos.writeobject (Saveobject); } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); } finally {            Try {                if(Oos! =NULL) {oos.close (); }                if(Fos! =NULL) {fos.close (); }            } Catch(IOException e) {e.printstacktrace (); }        }    }

4.

     Public Static FinalObject restoreobject (String path) {FileInputStream fis=NULL; ObjectInputStream Ois=NULL; Object Object=NULL; File F=NewFile (path); if(!f.exists ()) {            return NULL; }        Try{FIS=NewFileInputStream (f); Ois=NewObjectInputStream (FIS); Object=Ois.readobject (); returnobject; } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); } Catch(ClassNotFoundException e) {e.printstacktrace (); } finally {            Try {                if(Ois! =NULL) {ois.close (); }                if(FIS! =NULL) {fis.close (); }            } Catch(IOException e) {e.printstacktrace (); }        }        returnobject; }    

5.

Private void gotologinactivity () {        new  UserBean ();        User.setusername ("Jianqiang");        User.setcountry ("Beijing");        User.setage (+);                 New Intent (loginnew2activity.  this,                 personcenteractivity. class );                Globalvariables.getinstance (). SetUser (user);                StartActivity (intent);    }

6.

protected void Initvariables () {        = globalvariables.getinstance (). GetUser ();          int age = user.getage ();    }

7.

Globalvariables.getinstance (). reset ();

8.

     Public void Reset () {        null;          This );    }

9.

10.

3rd Chapter Code