http://blog.sina.com.cn/s/blog_90cdca4c01010zs7.html

 

在手机应用与网络交互数据的时候,我们首先要判断有没有可用的网络，如果没有则跳到相应的网络设置页面，方法详见代码：

 

private boolean CheckNetwork() {
       boolean flag = false ;
       ConnectivityManager cwjManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
       if (cwjManager.getActiveNetworkInfo() ! = null )
           flag = cwjManager.getActiveNetworkInfo().isAvailable();
       if (!flag) {
           Builder b = new AlertDialog.Builder(this).setTitle( " 没有可用的网络 " ).setMessage( " 请开启GPRS或WIFI网络连接 " );
           b.setPositiveButton( " 确定 " , new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int whichButton) {
                   Intent mIntent = new Intent( " / " );
                   ComponentName comp = new ComponentName( " com.android.settings " , " com.android.settings.WirelessSettings " );
                   mIntent.setComponent(comp);
                   mIntent.setAction( " android.intent.action.VIEW " );
                   startActivity(mIntent);
               }
           }).setNeutralButton( " 取消 " , new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int whichButton) {
                   dialog.cancel();
               }
           }).create();
           b.show();
       }



       return flag;
   }