Update UI Simple helper class when downloading files based on Android

Because in the project development, there is such a simple need, ask Google, the network also has a lot of utils tools, but more redundant. I simply wrote a simple helper class.

/** * Download file, update UI Simple helper class * * @author jarlen * */ Public  class downloadhelper{    Private Static Final intDown_begin =0;Private Static Final intDown_updata =1;Private Static Final intDown_finish =2;Private Static Final intDown_error =3;PrivateContext Mcontext;PrivateTextView Mtextview;PrivateProgressBar MBar;PrivateHandler Handler =NewHandler () { Public void Handlemessage(Message msg) {if(! Thread.CurrentThread (). isinterrupted ()) {Switch(msg.what) { CaseDown_begin:if(Mtextview! =NULL) {Mtextview.settext ("Start Download"); }if(MBar! =NULL) {mbar.setprogress (0); } Break; CaseDown_updata:intfactor = MSG.ARG1;if(Mtextview! =NULL) {Mtextview.settext (factor +"%"); }if(MBar! =NULL) {mbar.setprogress (factor); } Break; CaseDown_finish:if(Mtextview! =NULL) {Mtextview.settext ("Download Complete"); }if(MBar! =NULL) {mbar.setprogress ( -); } Break; CaseDown_error:if(Mtextview! =NULL) {Mtextview.settext ("Download Error"); }if(MBar! =NULL) {mbar.setprogress (0); } Break;default: Break;    }            }        }; }; Public Downloadhelper(Context context) { This. Mcontext = Context; }/** * Set the UI to update when downloading TextView * @param View */     Public void Setupdataview(TextView view) { This. Mtextview = view; }/** * Set download, need to update the Ui,progressbar * @param Bar */     Public void Setupdatabar(ProgressBar bar) { This. MBar = bar; }/** * Start download * @param URL * file * @param Path * File Save address */     Public void Startdownload(FinalString URL,FinalString path) {NewThread () { Public void Run() {sendmsg (Down_begin,0);Try{Longdownloadsize = downloadupdatefile (URL, path);if(Downloadsize >0) {sendmsg (Down_finish,0); }                }Catch(Exception e)                    {E.printstacktrace (); Sendmsg (Down_error,0);        }            };    }.start (); }Private Long Downloadupdatefile(string down_url, String path)throwsException {intDown_step =1;//Hint step        intTotalSize;//Total file size        intDownloadcount =0;//already downloaded the good size        intUpdatecount =0;//File size that has been uploadedInputStream InputStream;        OutputStream OutputStream; URL url =NewURL (Down_url);        HttpURLConnection httpurlconnection = (httpurlconnection) URL. OpenConnection (); Httpurlconnection.setconnecttimeout ( -* +); Httpurlconnection.setreadtimeout ( -* +);//Get the size of the downloaded fileTotalSize = Httpurlconnection.getcontentlength ();if(Httpurlconnection.getresponsecode () = =404) {sendmsg (Down_error,0);Throw NewException ("fail!");        } InputStream = Httpurlconnection.getinputstream (); File dir =NewFile (path);if(!dir.exists ())        {Dir.mkdir (); } String name = Down_url.substring (Down_url.lastindexof ("/") +1, Down_url.length ()); File Updatefile =NewFile (dir, name); OutputStream =NewFileOutputStream (Updatefile,false);//File exists is overwritten        byteBuffer[] =New byte[1024x768];intReadSize =0; while((readsize = inputstream.read (buffer))! =-1) {outputstream.write (buffer,0, readsize); Downloadcount + = ReadSize;//Get the size downloaded to            //1% per growth            if(Updatecount = =0|| (Downloadcount * -/totalsize-down_step) >= updatecount) {updatecount + = Down_step;            Sendmsg (Down_updata, Updatecount); }        }if(HttpURLConnection! =NULL) {httpurlconnection.disconnect ();        } inputstream.close (); Outputstream.close ();returnDownloadcount; }Private void sendmsg(intFlagintFactor) {Message msg =NewMessage ();Switch(flag) { CaseDown_begin://Start         CaseDown_finish://Completed         CaseDown_error://Failure             Break; CaseDown_updata://Update progress barMsg.arg1 = factor; Break;default: Break;        } msg.what = Flag;    Handler.sendmessage (msg); }}

The use of simple description under;

new DownLoadHelper(this);helper1.setUpdataView(tv1);helper1.startDownLoad("http://img1.2345.com/appsimg/wallpaper/4/139460306960.jpg", path);

/********************************************/

Demo Source
http://download.csdn.net/detail/jarlen/8552443

Do not seriously check, there may be bugs, use the partner please own debug under, and notify me a bit, thank you

Update UI Simple helper class when downloading files based on Android