Android download files (1)

• Service download file, add tag:

<service android:name= ". MyService "></service>

To add related permissions:

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

• The code is as follows:

  public class Mainactivity extends Activity {
  Private button button;

      @Override
      protected void onCreate (Bundle savedinstancestate) {
          /TODO auto-generated method stub
           Super.oncreate (savedinstancestate);
          Setcontentview (r.layout.mainactivity);
          button = (button) Findviewbyid (R.id.button1);
          Button.setonclicklistener (New Onclicklistener () {

  @Override
  public void OnClick (View arg0) {
  TODO auto-generated Method Stub
  Intent Intent = new Intent (mainactivity.this,myservice.class);
  StartService (Intent);
  }
  });
  }
  }

  public class MyService extends Service {
  Private final String Downpath = "http://www.baidu.com/img/bdlogo.png";//Download link

  @Override
  public void OnCreate () {
  TODO auto-generated Method Stub
  Super.oncreate ();
  }

  @Override
  public int Onstartcommand (Intent Intent, int flags, int startid) {
  TODO auto-generated Method Stub
  You cannot use the network directly using the HTTP protocol, service is in the UI thread, you need to create a thread, separate from the main thread
  Final Handler Handler = new Handler () {
  @Override
  public void Handlemessage (Message msg) {
  TODO auto-generated Method Stub
  Super.handlemessage (msg);
  if (msg.what = = 1) {
  Stopself ();
  Toast.maketext (Getapplicationcontext (), "File Download Complete", 1). Show ();
  }
  }
  };

  Thread thread = new Thread (new Runnable () {
  @Override
  public void Run () {
  TODO auto-generated Method Stub
  HttpClient HttpClient = new Defaulthttpclient ();
  HttpPost HttpPost = new HttpPost (Downpath);
  HttpResponse HttpResponse = null;
  Get the SD card directory
  File File = Environment.getexternalstoragedirectory ();
  FileOutputStream outstream = null;
  try {
  HttpResponse = Httpclient.execute (HttpPost);
  if (Httpresponse.getstatusline (). Getstatuscode () = = 200) {
  Byte[] result = Entityutils.tobytearray (HttpResponse
  . GetEntity ());
  Determine if the SDK card is mounted and can store data
  if (Environment.getexternalstoragestate (). Equals (
  environment.media_mounted)) {
  File New_file = new file (file, "Bdlogo.png");
  OutStream = new FileOutputStream (new_file);
  Outstream.write (result, 0, result.length);
  Message message = Message.obtain ();
  Message.what = 1;
  Handler.sendmessage (message);
  Close Service

  }
  }
  } catch (Exception e) {
  TODO auto-generated Catch block
  E.printstacktrace ();
  } finally {
  try {
  Outstream.close ();
  Httpclient.getconnectionmanager (). Shutdown ();
  } catch (IOException e) {
  TODO auto-generated Catch block
  E.printstacktrace ();
  }

  }
  }
  });
  Thread.Start ();
  Return Super.onstartcommand (Intent, flags, Startid);
  }

  @Override
  Public IBinder Onbind (Intent arg0) {
  TODO auto-generated Method Stub
  return null;
  }

  }

Android download files (1)