Android Multi-threaded--handler (a) to achieve picture download

Create a child thread in the UI thread--"Get the network picture in a child thread"--"pass the binary picture through message in threads to handler,--" handler processing messages in Handlemessage ()

Package Com.example.android_handler_message;import Java.io.ioexception;import Org.apache.http.httpresponse;import Org.apache.http.client.clientprotocolexception;import Org.apache.http.client.httpclient;import Org.apache.http.client.methods.httpget;import Org.apache.http.impl.client.defaulthttpclient;import Org.apache.http.util.entityutils;import Android.os.bundle;import Android.os.handler;import android.os.Message; Import Android.app.activity;import Android.app.progressdialog;import Android.graphics.bitmap;import Android.graphics.bitmapfactory;import Android.view.menu;import Android.view.view;import Android.widget.Button;    Import Android.widget.imageview;public class Mainactivity extends Activity {private static int is_finished = 1;    Private button button = null;    Private ImageView ImageView = null;    Private String image_path = "http://i1.juyouqu.com/uploads/content//2014/04/1396611698344.jpg!w598";    Private ProgressDialog dialog = null; Private Handler handle = new Handler() {public void Handlemessage (Android.os.Message msg) {Bitmap Bitmap = null;            byte[] data = (byte[]) msg.obj;            Bitmap = Bitmapfactory.decodebytearray (data, 0, data.length);                if (msg.what = = is_finished) {Dialog.dismiss ();            Imageview.setimagebitmap (bitmap);    }        }              };        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);                  Setcontentview (R.layout.activity_main);        Button = (button) Findviewbyid (R.id.button1);        ImageView = (ImageView) Findviewbyid (R.ID.IMAGEVIEW1);        dialog = new ProgressDialog (this);        Dialog.settitle ("hint");                            Dialog.setmessage ("Downloading ......"); Button.setonclicklistener (New View.onclicklistener () {@Override public void OnClick (V  Iew arg0) {//TODO auto-generated method stub              New Thread (New MyTask ()). Start ();            Dialog.show ();    }        }); } public class MyTask implements Runnable {@Override public void run () {//TODO Auto-gene            Rated method stub HttpClient HttpClient = new Defaulthttpclient ();            HttpGet httpget = new HttpGet (image_path);                try {HttpResponse HttpResponse = Httpclient.execute (HttpGet); if (Httpresponse.getstatusline (). Getstatuscode () = = () {byte[] data = Entityutils.toby                    Tearray (Httpresponse.getentity ());                    Message message = Message.obtain ();                    Message.obj = data;                    Message.what = is_finished;                Handle.sendmessage (message); }} catch (Clientprotocolexception e) {//TODO auto-generated catch block E.prin            Tstacktrace ();   } catch (IOException e) {             TODO auto-generated Catch block E.printstacktrace (); }        }              }}