android download the file, how to do after downloading thefollowing program is executed ?

  /**   
      * 将一个InputStream里面的数据写入到SD卡中   
      * @param path   
      * @param fileName   
      * @param input   
      * @return   
      */   
     public File write2SDFromInput(String path,String fileName,InputStream input){
         File file = null;   
         OutputStream output = null;   
         try {   
             createSDDir(path);   
             String str = path + fileName;
             file = createSDFile(path + fileName); 
             output = new FileOutputStream(file);   
             byte[] buffer = new byte[FILESIZE];   
             while((input.read(buffer)) != -1){   
                 output.write(buffer);   
             }   
             output.flush();   
         }    
         catch (Exception e) {   
             e.printStackTrace();   
         }   
         finally{   
             try {   
                 output.close();   
             } catch (IOException e) {   
                 e.printStackTrace();   
             }   
         }   
         return file;   
     }
 

How to download code added in blocking , so he downloaded the following program is executed again . Please help us to see
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blocked ? UI will be blocked for more than 5s ANR, only through the handler and the thread with the realization , but there must be blocked during a prompt window or what kind of
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installation and download into the same thread on the line , java that level triggered
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reference:
Android shows online photo
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then how do things right , like C # fetch data from the com port when the direct use cretefile took a blocking function parameters . This has not been engaged in do not know where to start the

actually wanted to achieve , download files function call , wait until then downloaded from the download function which calls down the implementation . . .
------ reference --------------------------------------- < br> no way , I downloaded pictures ----- > to display pictures is written in a function , it's useless multithreading , that this does not belong to a single-threaded Mody
code below: download and display the time in a click inside

 //ListView单击事件
 		list_view_presentation.setOnItemClickListener(new OnItemClickListener(){
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 //下载函数downFile
 				int result = downloader.downFile("http://172.16.0.78:8082/upload/download/"+presentationName+"/"+presentationName+"_1.jpg", "download/"+presentationName+"/", presentationName+"_1.jpg");
 	
 //接下来就是现实图片的方法了							
 				sum =1;
 				setHtml(imagePath+presentationName+"/"+presentationName+"_1.jpg");
 				imageName = presentationName;
 				webview.loadDataWithBaseURL("about:blank", html, "text/html", "utf-8",null);
 				webview.setVisibility(View.VISIBLE);
 			}});
 
 	}
 

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I still can not use this method of online access to pictures , because a lot of people visit , and if my next visit to the local server only once . Later to see local pictures. . . Hey ~ ~ ~ ~
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plus a cycle of death
while (true) {
if (" determine if the download finished " ) {
break;
}
}
After downloading the statement to run ....