[android-developers] Downloaded .apk file always gives package parsing error on installations

hi everyone,
i am caught in a big problem...

I have made a downloading app. it works fine ,but one big problem is
there.

When i am downloading a .apk file using my code,on installing the
downloaded file i am always getting a package parsing error

My code:

try {
URL url = new URL(link);
HttpURLConnection connection;
try {
connection = (HttpURLConnection) url.openConnection();
File file=new File(SDCardDir+File.separator
+"DownloadEverythingPro"+File.separator+fileName);
if(file.exists()){
downloaded = (int) file.length();
status=Handlerr.RESUMED;
connection.setRequestProperty("Range", "bytes="+
(file.length())+"-");

}
else{
downloaded=0;
connection.setRequestProperty("Range", "bytes=" + 0 +
"-");
status=Handlerr.FRESH_DOWNLOAD;

}
connection.setDoInput(true);
connection.setDoOutput(true);
j=connection.getContentLength();
int lastSlash = url.toString().lastIndexOf('/');
fileName = "file.bin";
if(lastSlash >=0)
{
fileName = url.toString().substring(lastSlash + 1);
}
if(fileName.equals(""))
{
fileName = "file.bin";
}

k=j+downloaded;
BufferedInputStream in = new
BufferedInputStream(connection.getInputStream());
FileOutputStream fos=(downloaded==0)? new
FileOutputStream(SDCardDir+File.separator
+"DownloadEverythingPro"+File.separator+fileName): new
FileOutputStream(SDCardDir+File.separator
+"DownloadEverythingPro"+File.separator+fileName,true);
BufferedOutputStream bout = new BufferedOutputStream(fos,
1024);
byte[] data = new byte[1024];
int x = 0;
while ((x = in.read(data, 0, 1024)) >= 0) {
bout.write(data, 0, x);

downloaded += x;
informMiddle(status+"!"+downloaded+"/"+k
+"!"+this.fileName+"!"+this.link2);
}
in.close();
fos.close();
bout.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return;
}

} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return;

}

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