android dynamically obtain from the server welcome screen picture

Specific effect is welcome screen image from the server and then re- enter the application will be displayed next to the picture , probably thinking that's it.
------ Solution ---------------------------------------- ----
here as long to fill a url, the return is Drawable object Drawable object can be used directly

/**
 	 * @param urlpath
 	 * @return Bitmap
 	 * 根据url获取布局背景的对象
 	 */
 	public static Drawable getDrawable(String urlpath){
 		Drawable d = null;
 		try {
 			URL url = new URL(urlpath);
 			URLConnection conn = url.openConnection();
 			conn.connect();
 			InputStream in;
 			in = conn.getInputStream();
 			d = Drawable.createFromStream(in, "background.jpg");
 			// TODO Auto-generated catch block
 		} catch (IOException e) {
 			e.printStackTrace();
 		}
 		return d;
 	}

------ Solution ------------------------------------- -------
server requests every time you open the software like pictures, set your background
------ Solution ---------------- ----------------------------
use asynchronous task, from the server to download the pictures stored in sdcard inside, next landing application directly judge sdcard the existence of the picture , does not exist on the red server to download
------ For reference only -------------------------- -------------
Thank you , problem solved.
specifically is what I do:
1. welcome screen layout :

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:background="@drawable/app_start" >
 
     <ImageView
         android:id="@+id/app_start_iv"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:scaleType="fitXY" >
 
     </ImageView>
 
 
 </LinearLayout>

default load a welcome picture ;
2. enter the application from the server and then download the image ( if there are pictures to be updated on the server ) and save it to local ;
3. next re-enter the application directly from the local access and display in ImageView controls inside , so if the download fails, at least with the LinearLayout background image show.