/**    

         * 安装apk    

         * @param url    

         */              private void installApk(){                     File apkfile = new File(saveFileName);                      if (!apkfile.exists()) {                              return;                     }                             Intent i = new Intent(Intent.ACTION_VIEW);                     i.setDataAndType(Uri.parse( "file://" + apkfile.toString()), "application/vnd.android.package-archive");        

                context.startActivity(i);    

        }