Application not installed
<p>Download file already success but when install it has an error "application-not-installed"
I already use INSTALL_NON_MARKET_APPS permission
Install prompt already there but everytime I tried , it's always "application-not-installed" error. </p>

<pre><code>public void Update(String apkurl){
    try {
          URL url = new URL(apkurl); 
          HttpURLConnection c = (HttpURLConnection) url.openConnection();
          c.setRequestMethod("GET");
          c.setDoOutput(true);
          try{
          c.connect();
          } catch (Exception e) {
              Toast.makeText(getApplicationContext(),e.getMessage() , Toast.LENGTH_LONG).show();
          }
          String PATH = Environment.getExternalStorageDirectory() + "/download/";
          File file = new File(PATH);
          file.mkdirs();
          File outputFile = new File(file, "prov1.apk");
          FileOutputStream fos = new FileOutputStream(outputFile);

          InputStream is = c.getInputStream();

          byte[] buffer = new byte[1024];
          int len1 = 0; 
          while ((len1 = is.read(buffer)) != -1) {
              fos.write(buffer, 0, len1);
          } 
          fos.close();
          is.close();//till here, it works fine - .apk is download to my sdcard in download file

          Intent intent = new Intent(Intent.ACTION_VIEW);  
          intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

          intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/download/" + "prov1.apk")), "application/vnd.android.package-archive");

          startActivity(intent);   

      } catch (IOException e) {
          Toast.makeText(getApplicationContext(), "Update error!", Toast.LENGTH_LONG).show();
      }
}  
</code></pre>

<p>I already read another question about this topic but still stuck. I am really thank for your help.</p>
