Android enables app auto-update function

Now the general Android software needs to be constantly updated, when you open an app, if there is a new version, it will prompt you to have a new version needs to be updated. This applet implements this function.

The feature of this applet is that when there is an update, a prompt will pop up, click OK, then in the notification to create a progress bar to download, click Cancel, then cancel the update.

The following is the detailed code:

1. Create a layout file, Notification_item.xml, to generate a progress bar and download icon in the notification bar.

<?xml version= "1.0" encoding= "Utf-8"? ><relativelayout xmlns:android= "http://schemas.android.com/apk/res/ Android "Android:layout_width=" Fill_parent "android:layout_height=" fill_parent "android:padding=" 3DP "> &lt ; ImageView android:id= "@+id/notificationimage" android:layout_width= "Wrap_content" Android:layout_hei ght= "Wrap_content" android:src= "@android:d rawable/stat_sys_download"/> <textview android:id= "@+id/ Notificationtitle "android:layout_width=" wrap_content "android:layout_height=" Wrap_content "android:l        Ayout_alignparentright= "true" android:layout_torightof= "@id/notificationimage" android:paddingleft= "6DP" Android:textcolor= "#FF000000"/> <textview android:id= "@+id/notificationpercent" android:layout        _width= "Wrap_content" android:layout_height= "wrap_content" android:layout_below= "@id/notificationimage"      android:paddingtop= "2DP"  Android:textcolor= "#FF000000"/> <progressbar android:id= "@+id/notificationprogress" style= "@styl        E/progressbarhorizontal_color "android:layout_width=" wrap_content "android:layout_height=" Wrap_content " android:layout_alignleft= "@id/notificationtitle" android:layout_alignparentright= "true" Android:layout_al        igntop= "@id/notificationpercent" android:layout_below= "@id/notificationtitle" android:paddingleft= "6DP" android:paddingright= "3DP" android:paddingtop= "2DP"/></relativelayout>

2. Create the Appcontext class, which inherits from application.

Package Com.test.application;import Android.app.application;import Android.content.context;import Com.test.update.config.config;public class AppContext extends application {private static, AppContext appinstance; Private Context context;public static AppContext getinstance () {return appinstance;} @Overridepublic void OnCreate () {//TODO auto-generated method Stubsuper.oncreate (); appinstance = This;context = This.get Basecontext ();////gets the current version number//try {//packageinfo packageinfo = Getapplicationcontext ()//.getpackagemanager (). Getpackageinfo (Getpackagename (), 0);//config.localversion = Packageinfo.versioncode;//config.serverversion = 1;// Assuming the server version is 2, the local version defaults to 1//} catch (Namenotfoundexception e) {//e.printstacktrace ();//}initglobal ();} public void Initglobal () {try {config.localversion = Getpackagemanager (). Getpackageinfo (Getpackagename (), 0). Versioncode; Set the local version number Config.serverversion = 2;//Assume that the server version is 2, the local version defaults to the actual development is to get the latest version from the server, Android specific and back-end interaction See I am another///outside the Post} catch ( Exception ex) {ex.printstacktrace ();}}} 

3. Create a Profile class Config.java, define some version-related constants in this class

Package Com.test.update.config;public class Config {//version information public    static int localversion = 0;    public static int serverversion = 0;    /* Download Package Installation path */public      static final String Savepath = "/sdcard/test/";        public static final String savefilename = Savepath + "test.apk";  }

4. Write the update service class Updateservcie.java

Package Com.test.update;import Java.io.file;import Java.io.fileoutputstream;import java.io.inputstream;import Java.net.httpurlconnection;import Java.net.url;import Android.annotation.suppresslint;import Android.app.notification;import Android.app.notificationmanager;import Android.app.pendingintent;import Android.app.service;import Android.content.intent;import Android.net.uri;import Android.os.Environment;import Android.os.handler;import Android.os.ibinder;import Android.os.message;import Android.widget.RemoteViews;import  Com.test.update.config.config;public class Updateservice extends Service {//title private int TitleID = 0;//file Stores private files Updatedir = null;private File updatefile = null;//Download status private final static int download_complete = 0;private final Stati c int download_fail = 1;//notification bar private Notificationmanager Updatenotificationmanager = null;private Notification updatenot ification = null;//notification bar Jump intentprivate Intent updateintent = null;private pendingintent updatependingintent = null;/*** * Create a notification bar */remoteviews contentview;//such a lot of download code, I do not do too much explanation int downloadcount = 0;int CurrentSize = 0;long Total Size = 0;int Updatetotalsize = 0;//Prepare the relevant download work in the Onstartcommand () method: @SuppressWarnings ("deprecation") @Overridepublic int Onstartcommand (Intent Intent, int flags, int startid) {//Get pass value TitleID = Intent.getintextra ("TitleID", 0);//Create File if (Androi D.os.environment.media_mounted.equals (Android.os.Environment.getExternalStorageState ())) {Updatedir = new File ( Environment.getexternalstoragedirectory (), config.savefilename), updatefile = new File (Updatedir.getpath (), Getresources (). getString (TitleID) + ". apk");} This.updatenotificationmanager = (Notificationmanager) getsystemservice (Notification_service); This.updatenotification = new Notification ();//Set download process, click on the notification bar, back to the main interface updateintent = new Intent (This, Updateactivity.class); updatependingintent = pendingintent.getactivity (this, 0, updateintent,0);// Set the notification bar to display content Updatenotification.icon = R.drawable.ic_launcher;updatenotification.tickerteXT = "Start Download"; Updatenotification.setlatesteventinfo (This, "QQ", "0%", updatependingintent);// Notification updatenotificationmanager.notify (0, updatenotification);//Open a new thread to download, if using the service synchronization download, will cause the ANR problem, The service itself also blocks the new Thread (New Updaterunnable ()). Start ();//This is the focus of the download, is the process of the download return Super.onstartcommand (Intent, flags, Startid);} @Overridepublic ibinder onbind (Intent arg0) {//TODO auto-generated method Stubreturn null;} @SuppressLint ("Handlerleak") private Handler Updatehandler = new Handler () {@Overridepublic void Handlemessage (Message msg) {switch (msg.what) {case download_complete://click install Pendingintenturi uri = Uri.fromfile (updatefile); Intent Installintent = new Intent (Intent.action_view); Installintent.setdataandtype (URI, "application/ Vnd.android.package-archive "); updatependingintent = pendingintent.getactivity (updateservice.this, 0, InstallIntent , 0); updatenotification.defaults = notification.default_sound;//ringtone Alert Updatenotification.setlatesteventinfo ( Updateservice.this, "QQ", "Download complete, click Install." ", Updatependingintent); updatenotificationmanager.notify (0, updatenotification);//Stop Service StopService (updateintent); case DOWNLOAD_ fail://Download Failed Updatenotification.setlatesteventinfo (updateservice.this, "QQ", "Download complete, click Install. ", updatependingintent); updatenotificationmanager.notify (0, updatenotification);d Efault:stopservice (updateIntent );}}}; Public long Downloadupdatefile (String downloadurl, File saveFile) throws Exception {HttpURLConnection httpconnection = Null;inputstream is = null; FileOutputStream fos = null;try {URL url = new URL (downloadurl); httpconnection = (httpurlconnection) url.openconnection () ; Httpconnection.setrequestproperty ("User-agent", "pacifichttpclient"); if (CurrentSize > 0) { Httpconnection.setrequestproperty ("RANGE", "bytes=" + currentsize + "-");} Httpconnection.setconnecttimeout (10000); Httpconnection.setreadtimeout (20000); updatetotalsize = Httpconnection.getcontentlength (); if (httpconnection.getresponsecode () = = 404) {throw new Exception ("fail!");} is = Httpconnection.getinputstream (); fos = NEW FileOutputStream (SaveFile, false); byte buffer[] = new Byte[4096];int readsize = 0;while ((readsize = is.read (buffer)) &G T 0) {fos.write (buffer, 0, readsize); TotalSize + = readsize;//To prevent frequent notifications from tightening the application, increase the percentage by 10 to notify once if ((Downloadcount = = 0) | | (int) (TotalSize * 100/updatetotalsize)-> Downloadcount) {downloadcount + = 10;updatenotification.setlatesteventinfo (U Pdateservice.this, "Downloading", (int) totalsize * 100/updatetotalsize+ "%", updatependingintent);/*** * Here we use a custom view to display notification */updatenotification.contentview = new Remoteviews (Getpackagename (), R.layout.notification_item); UpdateNotification.contentView.setTextViewText (R.id.notificationtitle, "downloading"); UpdateNotification.contentView.setProgressBar (R.id.notificationprogress, Downloadcount, false); Updatenotificationmanager.notify (0, updatenotification);}} finally {if (httpconnection! = null) {Httpconnection.disconnect ();} if (is = null) {Is.close ();} if (fos! = null) {Fos.close ();}} return totalsize;} Class Updaterunnable IMplements Runnable {Message message = Updatehandler.obtainmessage ();p ublic void Run () {message.what = Download_complete; try {//Increase permissions <uses-permission//android:name= "Android.permission.WRITE_EXTERNAL_STORAGE" >;if (! Updatedir.exists ()) {updatedir.mkdirs ();} if (!updatefile.exists ()) {updatefile.createnewfile ();} Download function to QQ for example//Add permission <uses-permission//android:name= "Android.permission.INTERNET" >;long downloadsize = Downloadupdatefile ("http://softfile.3g.qq.com:8080/msoft/179/1105/10753/MobileQQ1.0 (Android) _build0198.apk", Updatefile); if (Downloadsize > 0) {//download succeeded Updatehandler.sendmessage (message);}} catch (Exception ex) {ex.printstacktrace (); message.what = download_fail;//download failed updatehandler.sendmessage (message);}}}

5. Writing the Activity class Updateactivity

Package Com.test.update;import Com.test.update.config.config;import Android.support.v4.app.fragment;import Android.app.activity;import Android.app.alertdialog;import Android.content.dialoginterface;import Android.content.intent;import Android.os.bundle;import Android.util.log;import Android.view.LayoutInflater;public Class Updateactivity extends Activity {@Overrideprotected void onCreate (Bundle savedinstancestate) {super.oncreate ( Savedinstancestate); Setcontentview (R.layout.activity_main); Checkversion ();} /** * Check for updated version */public void Checkversion () {if (Config.localversion < config.serverversion) {log.i ("Hgncxzy", "======== ====================== ");//Discover new version, prompt user to update alertdialog.builder alert = new Alertdialog.builder (this); Alert.settitle (" Software Upgrade "). Setmessage (" New version found, recommended for immediate update use. "). Setpositivebutton ("Update", new Dialoginterface.onclicklistener () {public void OnClick (Dialoginterface dialog,int which) { Turn on update Service updateservice//here in order to better modularize the update, you can pass some updateservice dependent values//such as layout ID, resource ID, dynamically obtained title, here app_name for example intent updateintent = new Intent (updateactivity.this,updateservice.class); Updateintent.putextra ("TitleID", R.string.app_name); StartService (updateintent);}}). Setnegativebutton ("Cancel", new Dialoginterface.onclicklistener () {public void OnClick (Dialoginterface dialog,int which) { Dialog.dismiss ();}}); Alert.create (). Show (); else {//cleanup work, omit//Cheanupdatefile ()}}}

6. Add permissions and load the service statically (loaded in the configuration file).

    <uses-permission android:name= "Android.permission.INTERNET"/>    <uses-permission android:name= " Android.permission.WRITE_EXTERNAL_STORAGE "/>    <uses-permission android:name=" android.permission.MOUNT_ Unmount_filesystems "/>

Registration Services

<service android:name= "Com.test.update.UpdateService" >        </service>

The complete Androidmanifest.xml file is as follows:

<?xml version= "1.0" encoding= "Utf-8"? ><manifest xmlns:android= "http://schemas.android.com/apk/res/        Android "package=" Com.test.update "android:versioncode=" 1 "android:versionname=" 1.0 "> <uses-sdk android:minsdkversion= "8" android:targetsdkversion= "8"/> <application android:name= "com.test.appli cation.            AppContext "android:icon=" @drawable/ic_launcher "android:label=" @string/app_name "> <activity Android:name= "com.test.update.UpdateActivity" android:label= "@string/app_name" > <in tent-filter> <action android:name= "Android.intent.action.MAIN"/> <category Android Oid:name= "Android.intent.category.LAUNCHER"/> </intent-filter> </activity> <se Rvice android:name= "Com.test.update.UpdateService" > </service> </application> <uses-permis Sion Android:name= "Android.permiSsion. INTERNET "/> <uses-permission android:name=" Android.permission.WRITE_EXTERNAL_STORAGE "/> <uses-permiss Ion Android:name= "Android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/></manifest>

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Android enables app auto-update function