Android Learning-interface-event-asynctask

Asynchronous task Asynctask complete a download

Activity_main.xml

<Relativelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Tools:context= "${relativepackage}.${activityclass}" >    <ButtonAndroid:id= "@+id/button1"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_alignparentleft= "true"Android:layout_alignparenttop= "true"Android:layout_marginleft= "23DP"Android:layout_margintop= "14DP"Android:text= "Start Download" />    <EditTextAndroid:id= "@+id/edittext1"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_alignleft= "@+id/button1"Android:layout_alignparentbottom= "true"Android:layout_alignparentright= "true"Android:layout_below= "@+id/button1"Android:layout_margintop= "45DP"Android:ems= "Ten"Android:inputtype= "Textmultiline" >        <Requestfocus/>    </EditText></Relativelayout>

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Mainactivity.java

 Public classMainactivityextendsActivity {EditText editText1;        Button btn1; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main); EditText1=(EditText) Findviewbyid (R.ID.EDITTEXT1); BTN1=(Button) Findviewbyid (R.id.button1); Btn1.setonclicklistener (NewOnclicklistener () {@Override Public voidOnClick (View v) {Mydown down=NewMydown (mainactivity. This); Try{Down.execute (NewURL ("http://w.x.baidu.com/alading/anquan_soft_down_normal/12350")); } Catch(malformedurlexception e) {//TODO Auto-generated catch blockE.printstacktrace ();    }                            }        }); }            classMydownextendsAsynctask<url, Integer, string>{        //Download ProgressProgressDialog p; //Total Download Volume        intTotalsize=0; //Current Download        intDownloadszie=0;        Context context; //Download Start timeCalendar date_s=calendar.getinstance (); //Download End TimeCalendar date_e;  PublicMydown (Context context) { This. context=context; } @Overrideprotected voidOnPreExecute () {p=NewProgressDialog (context); P.setmax (0); P.settitle ("In Task Execution"); P.setmessage ("Task execution completed than, please wait ...");             P.setprogressstyle (progressdialog.style_horizontal); P.setcancelable (false); P.setindeterminate (false);        P.show (); } @OverrideprotectedString doinbackground (URL ... params) {stringbuffer str=NewStringBuffer (); Try{httpurlconnection http= (httpurlconnection) params[0].openconnection (); //get total Download VolumeTotalsize=http.getcontentlength (); InputStream in=Http.getinputstream (); byte[] buffer =New byte[1024]; intReadsize=0;  while(Readsize=in.read (buffer))!=-1) {date_e=calendar.getinstance (); //calculates the total time of the download, mainly for the calculation of k/s                    intA= (int) (Date_e.gettimeinmillis ()-date_s.gettimeinmillis ())/1000; //Total DownloadsDownloadszie =downloadszie +readsize; //Refresh UIpublishprogress (downloadszie,totalsize,a); }                returnstr.tostring (); } Catch(Exception e) {//TODO Auto-generated catch blockE.printstacktrace (); }            return NULL; }                protected voidOnPostExecute (String result) {Edittext1.settext ("Download Complete");        P.dismiss (); } @Overrideprotected voidonprogressupdate (Integer ... values) {p.setprogress (values[0]/1024); P.setmax (values[1]/1024); intSed=0; if(values[2]==0) sed=1;ElseSed=values[0]/1024/values[2]; P.setmessage ("Task execution completed than, please wait ... \ n speed" +sed+ "k/s"); }            }}

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Android Learning-interface-event-asynctask