Android 判斷網絡連接運用

 if (isConnect(this) == false) {
   new AlertDialog.Builder(
     this)
     .setTitle("網絡錯誤")
     .setMessage(
       "網絡連接失敗，

請確認網絡連接")
     .setPositiveButton(
       "確定",
       new  www.2cto.com

DialogInterface.OnClickListener() {
       

@Override
        public

void onClick(
        

 DialogInterface arg0,
        

 int arg1) {
        

// TODO Auto-generated method stub

        }
       }).show();
  }

private boolean isConnect(
   Gongzibai gongzibai) {
  ConnectivityManager conManager = (ConnectivityManager)

getSystemService(Context.CONNECTIVITY_SERVICE);

  NetworkInfo networkInfo = conManager
    .getActiveNetworkInfo();

  if (networkInfo != null) { // 注意，這個判斷一定要的哦

，要不然會出錯

   return networkInfo
     .isAvailable();

  }

  return false;

 }

--------------manifest.xml

  <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />