Android Version detection upgrade

We should all have a similar experience, when an app needs to be updated, the entry screen will alert you if a new update is updated, there are a few steps

1 checking the current version first
2 determining the version in the server
3 If there is an update, click Update, download the installation package, and install it automatically after the download is complete.

How does the code implement it? Let's see it together.

    /*     * 获取当前程序的版本号      */    privategetVersionNamethrows Exception{        //获取packagemanager的实例         PackageManager packageManager = getPackageManager();        //getPackageName()是你当前类的包名，0代表是获取版本信息        0);        return packInfo.versionName;     }

Read Server version number

    /* * Parse the XML file returned by the server with the Pull parser (XML encapsulates the version number) */     Public StaticUpdatainfoGetupdatainfo(InputStream is) throws exception{Xmlpullparser parser = Xml.newpullparser (); Parser.setinput ( is,"Utf-8");//Set the parsed data source        intType = Parser.geteventtype (); Updatainfo info =NewUpdatainfo ();//entity         while(Type! = xmlpullparser.end_document) {Switch(type) { CaseXmlpullparser.start_tag:if("Version". Equals (Parser.getname ())) {info.setversion (Parser.nexttext ());//Get version number}Else if("url". Equals (Parser.getname ())) {Info.seturl (Parser.nexttext ());//Get the APK file to be upgraded}Else if("description". Equals (Parser.getname ())) {info.setdescription (Parser.nexttext ());//Get information about this file} Break;        } type = Parser.next (); }returnInfo }

Download

     Public StaticFileGetfilefromserver(String path, ProgressDialog PD) throws exception{//If equal indicates that the current sdcard is mounted on the phone and is available        if(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {URL url =NewURL (path);            HttpURLConnection conn = (httpurlconnection) url.openconnection (); Conn.setconnecttimeout ( the);//Gets the size of the filePd.setmax (Conn.getcontentlength ()); InputStream is= Conn.getinputstream (); File File =NewFile (Environment.getexternalstoragedirectory (),"updata.apk"); FileOutputStream fos =NewFileOutputStream (file); Bufferedinputstream bis =NewBufferedinputstream ( is);byte[] buffer =New byte[1024x768];intLen;intTotal=0; while(Len =bis.read (buffer))!=-1) {fos.write (buffer,0, Len); total+= Len;//Get current Download volumePd.setprogress (total);            } fos.close (); Bis.close (); is. Close ();returnFile }Else{return NULL; }    }

Version matching, automatic installation

    / * * Get XML parsing from the server and compare version number */     Public  class checkversiontask implements Runnable{         Public void Run() {Try{//Get the server address from the resource fileString path = Getresources (). getString (R.string.serverurl);//object wrapped as a URLURL url =NewURL (path);                 HttpURLConnection conn = (httpurlconnection) url.openconnection (); Conn.setconnecttimeout ( the);                 InputStream is =conn.getinputstream (); info = Updatainfoparser.getupdatainfo (IS);if(Info.getversion (). Equals (Versionname)) {LOG.I (TAG,"version number same without upgrade");                Loginmain (); }Else{LOG.I (TAG,"The version number is different, prompting the user to upgrade"); Message msg =NewMessage ();                    Msg.what = updata_client;                Handler.sendmessage (msg); }            }Catch(Exception e) {//Pending processingMessage msg =NewMessage ();                Msg.what = Get_undatainfo_error;                Handler.sendmessage (msg);            E.printstacktrace (); }}} Handler Handler =NewHandler () {@Override         Public void Handlemessage(Message msg) {//TODO auto-generated method stub            Super. Handlemessage (msg);Switch(msg.what) { CaseUpdata_client://dialog box notifies the user to upgrade the programShowupdatadialog (); Break; CaseGet_undatainfo_error://server timed outToast.maketext (Getapplicationcontext (),"failed to get server update information",1). Show (); Loginmain (); Break; CaseDown_error://Download apk failedToast.maketext (Getapplicationcontext (),"Download new version failed",1). Show (); Loginmain (); Break; }        }    };/* * * Pop-up dialog to notify users of updates * * Popup dialog box steps: * 1. Create Alertdialog Builder. * 2. To set properties for Builder, dialog box contents, Style, Button * 3. Create a dialog box with Builder * 4. dialog box Show () out */    protected void Showupdatadialog() {Alertdialog.builder Builer =NewBuilder ( This) ; Builer.settitle ("Version Upgrade"); Builer.setmessage (Info.getdescription ());//When the Click OK button downloads the new apk from the server and installsBuiler.setpositivebutton ("OK",NewOnclicklistener () { Public void OnClick(Dialoginterface Dialog,intwhich) {log.i (TAG,"Download apk, update");            DOWNLOADAPK (); }           });//Sign in when the Cancel button is clickedBuiler.setnegativebutton ("Cancel",NewOnclicklistener () { Public void OnClick(Dialoginterface Dialog,intwhich) {//TODO auto-generated method stubLoginmain ();        }        });        Alertdialog dialog = Builer.create ();    Dialog.show (); }/ * * Download APK from the server * /    protected void downloadapk() {FinalProgressDialog PD;//Progress bar dialog boxPD =NewProgressDialog ( This);        Pd.setprogressstyle (progressdialog.style_horizontal); Pd.setmessage ("Downloading Updates"); Pd.show ();NewThread () {@Override             Public void Run() {Try{File File = Downloadmanager.getfilefromserver (Info.geturl (), PD); Sleep the);                    installapk (file); Pd.dismiss ();//Close the Progress Bar dialog box}Catch(Exception e) {Message msg =NewMessage ();                    Msg.what = Down_error;                    Handler.sendmessage (msg);                E.printstacktrace ();    }}}.start (); }//install APK    protected void installapk(File file) {Intent Intent =NewIntent ();//Perform actionsIntent.setaction (Intent.action_view);//type of data executedIntent.setdataandtype (uri.fromfile (file),"Application/vnd.android.package-archive");    StartActivity (Intent); }/ * * Enter the main interface of the program */    Private void Loginmain() {Intent Intent =NewIntent ( This, Mainactivity.class); StartActivity (Intent);//End the current activity         This. Finish (); }

Related classes

 Public classUpdatainfo {PrivateString version;PrivateString URL;PrivateString description; PublicStringgetversion() {returnVersion } Public void setversion(String version) { This. Version = version; } PublicStringGETURL() {returnUrl } Public void SetUrl(String URL) { This. url = URL; } PublicStringgetdescription() {returnDescription } Public void setdescription(String description) { This. Description = description; }}

Related layouts

<?xml version="1.0" encoding="utf-8"?><info>    <version>2.0</version>    <url>http://192.168.0.64:8080/mobilesafe.apk</url>    <description>检测到最新版本，请及时更新！</description></info>

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Android Version detection upgrade