android 检查可用网络

转载，以备日后查阅
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;   }
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