Android Service Background Download

 Service

ImportAndroid.app.NotificationManager;ImportAndroid.app.Service;ImportAndroid.content.Context;Importandroid.content.Intent;ImportAndroid.net.Uri;ImportAndroid.os.AsyncTask;Importandroid.os.Environment;ImportAndroid.os.IBinder;ImportAndroid.support.v7.app.NotificationCompat;ImportAndroid.util.Log;ImportAndroid.widget.Toast;ImportJava.io.File;ImportJava.io.FileOutputStream;Importjava.io.IOException;ImportJava.io.InputStream;ImportJava.net.URL;Importjava.net.URLConnection;/*** Created by DK on 2016/11/25.*/ Public classDownloadsignatureserviceextendsService {protected Static FinalString Filerootpath = environment.getexternalstoragedirectory () +File.separator; protected Static FinalString Filedownloadpath = "sunrise/download/"; protected intFileszie;//File Size    protected intFilecache;//File Cache    protectedString fileName = "";//file name    protectedString filenametemp = "";//Temporary Files    protectedString urlstr = "";//Download URL    protectedFile Downloaddir, DownloadFile, downloadfiletemp; protected StaticNotificationmanager Mnotifymanager; protected StaticNotificationcompat.builder Mbuilder; protected Static Final intNOTIFIID = 0x000; protected Static FinalString TAG = "LLL::"; @Override Publicibinder onbind (Intent Intent) {return NULL; } @Override Public voidonCreate () {Super. OnCreate (); } @Override Public intOnstartcommand (Intent Intent,intFlagsintStartid) {LOG.E (TAG,"Onstartcommand"); Urlstr= (String) Intent.getextras (). Get ("Signatureurl"); LOG.E (TAG,"URLSTR =" +urlstr); /*Signature Download Url*/DownloadFile (URLSTR); return Super. Onstartcommand (Intent, flags, Startid); } @Override Public voidOnDestroy () {LOG.E (TAG,"OnDestroy"); Super. OnDestroy (); }    /*** Download Signature * *@paramDownloadURL*/    protected voidDownloadFile (String downloadurl) {log.e (TAG,"DownloadFile"); /*file name*/FileName= Downloadurl.substring (Downloadurl.lastindexof ("/") + 1); /*Cache Files*/filenametemp= "Download.tmp"; /*Download Catalogue*/Downloaddir=NewFile (Filerootpath +Filedownloadpath); DownloadFile=NewFile (Filerootpath + Filedownloadpath +fileName); Downloadfiletemp=NewFile (Filerootpath + Filedownloadpath +filenametemp); if(!downloaddir.exists ())        {Downloaddir.mkdirs (); }        /*How files exist for this installation file*/        if(Downloadfile.exists ()) {Installapp (downloadsignatureservice). This, Filerootpath + Filedownloadpath +fileName); }        /*otherwise download the file*/        Else{Mnotifymanager=(Notificationmanager) downloadsignatureservice. This. Getsystemservice (Downloadsignatureservice. This.            Notification_service); Mbuilder=NewNotificationcompat.builder (Downloadsignatureservice. This); Mbuilder.setcontenttitle ("Download e-signature App"). Setcontenttext ("Downloading ..."). Setprogress (100, 0,false). Setsmallicon (Android.            R.drawable.stat_sys_download); //DownloadFile            NewAsynctask<string, Integer, string>() {@Overrideprotected voidOnPreExecute () {Mbuilder.setticker ("Download electronic signature"). Setprogress (100, 0,false);                    Mnotifymanager.notify (Notifiid, Mbuilder.build ()); Super. OnPreExecute (); } @Overrideprotected voidonprogressupdate (Integer ... values) {LOG.E (TAG,"---download cache" + values[0] + "---"); intpp = ((values[0] + 1) * 100/Fileszie); Mbuilder.setprogress (P, pp,false). Setcontenttext ("downloaded" + pp + "%");                    Mnotifymanager.notify (Notifiid, Mbuilder.build ()); Super. Onprogressupdate (values); } @Overrideprotectedstring Doinbackground (String ... params) {Try{fileName= Params[0].substring (Params[0].lastindexof ("/") + 1); LOG.E ("LLL", "---fileName =" +fileName); //Get file nameURL Myurl =NewURL (params[0]); URLConnection Conn=myurl.openconnection (); Conn.setdoinput (true);                        Conn.connect (); InputStream is=Conn.getinputstream (); Fileszie= Conn.getcontentlength ();//get file size based on response                        if(Fileszie <= 0) {                            Throw NewRuntimeException ("Unable to learn file size"); }                        if(IS = =NULL)Throw NewRuntimeException ("Stream is null"); /*Download Catalogue*/                        if(!downloaddir.exists ())                        {Downloaddir.mkdirs (); }                        //storing data in Path + file nameFileOutputStream fos =NewFileOutputStream (downloadfiletemp); byteBuf[] =New byte[1024]; Filecache= 0;  Do {                            //Loop Read                            intNumread =Is.read (BUF); if(Numread = =-1) {                                 Break; } fos.write (BUF,0, Numread); Filecache+=Numread;  This. publishprogress (Filecache); }  while(true); Try{is.close (); } Catch(Exception ex) {LOG.E ("Tag", "Error:" +ex.getmessage ()); }                    } Catch(IOException e) {e.printstacktrace (); }                    return"Download Succeeded"; } @Overrideprotected voidOnPostExecute (String s) {/*after the download is successful*/                    if(Downloadfiletemp.exists ()) {Downloadfiletemp.renameto (downloadfile); } toast.maketext (Downloadsignatureservice. This, S, Toast.length_short). Show (); /*Cancel Notification*/Mbuilder.setcontenttext (s). Setprogress (100, 0,false);                    Mnotifymanager.cancel (NOTIFIID); Installapp (Downloadsignatureservice. This, Filerootpath + Filedownloadpath +fileName); /*Service Kill Suicide*/Downloadsignatureservice. This. Stopself (); Super. OnPostExecute (s);        }}.execute (DownloadURL); }    }    /*** Install APK * *@paramContext *@paramFilePath*/     Public voidInstallapp (Context context, String FilePath) {File _file=NewFile (FilePath); Intent Intent=NewIntent (Intent.action_view);        Intent.setflags (Intent.flag_activity_new_task); Intent.setdataandtype (Uri.fromfile (_file),"Application/vnd.android.package-archive");    Context.startactivity (Intent); }}

Start the service

New Bundle (); Bundle.putstring ("Signatureurl", Instance.signatureurl "the address you downloaded"); /* Electronic signature */  New Intent (). SetClass (CTX, Downloadsignatureservice.  Class). Putextras (bundle); StartService (it);

Permissions

<!--permission to read and write memory cards--    <uses-permission android:name= "Android.permission.WRITE_EXTERNAL_STORAGE"/>    <!--access to networking rights--    <uses-permission android:name= "Android.permission.INTERNET"/>

Configuration

<service android:name= ". Service.downloadsignatureservice "/>

　　

This is already very easy to understand, you can refer to the download after the completion of automatic installation, and so on, need to see,

Asynctask<string, Integer, string>

Android Service Background Download