Android - 如何检查互联网访问，而不仅仅是连接到 wifi?

Android - How to check internet Access, not just connectivity to wifi?(Android - 如何检查互联网访问，而不仅仅是连接到 wifi?)

问题描述

我尝试了下面的代码来检查我的手机是否连接到无线网络，当我想知道我的手机是否连接到网络时它运行良好，但它无法提供有关互联网访问的信息......像Pinging"任何网站.实际上我关注了很多链接但仍然没有答案，所以如果有人可以提供帮助，我将非常感激.

I tried the below code to check whether my mobile is connected to a wireless network and it works well when I want to know if my mobile is connected to the network, but it fails to give information about the internet access ... something like "Pinging" any website. Actually I followed many links but still no answer, so I'll be so thankful if anybody can help.

提前致谢.

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Toast t = new Toast(getApplicationContext());

    if (isInternetOn()) {
         // INTERNET IS AVAILABLE, DO STUFF..
         Toast.makeText(ConnectivityTestActivity.this,"Network is Available", Toast.LENGTH_LONG).show();

         }
    else {
         // NO INTERNET AVAILABLE, DO STUFF..
        Toast.makeText(ConnectivityTestActivity.this,"No Network Available", Toast.LENGTH_LONG).show();

        }
}

public final boolean isInternetOn() {


    ConnectivityManager connec =  (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    // ARE WE CONNECTED TO THE NET
    if ( connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED ||
    connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTING ||
    connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTING ||
    connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED ) {
    // MESSAGE TO SCREEN FOR TESTING (IF REQ)
    //Toast.makeText(this, connectionType + " connected", Toast.LENGTH_SHORT).show();
    return true;
    } else if ( connec.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED ||  connec.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED  ) {

    return false;
    }
    return false;
    }}

点击下面的链接，它包含 Ping google 服务器的一个很好的答案并获得结果

Follow below link it contains a great answer for Ping google server and get result

https://stackoverflow.com/a/16458623/1239911

推荐答案

其实我用了同样的函数isInternetOn() 但是我去掉了连接条件.它必须检查连接状态是否已连接以及是否正在尝试连接.这对我不起作用，所以我删除了连接状态检查，然后它起作用了.

Actually I used the same function isInternetOn() but I removed the connecting condition. It had to check the status of connection if connected or not and if it is trying to connect. This didn't work for me, so I removed connecting status checking and then it worked.

感谢所有回复.

public final boolean isInternetOn()
{
  ConnectivityManager connec = (ConnectivityManager)
    getSystemService(Context.CONNECTIVITY_SERVICE);

  // ARE WE CONNECTED TO THE NET
  if ( connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED ||
       connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED )
  {
    // MESSAGE TO SCREEN FOR TESTING (IF REQ)
    //Toast.makeText(this, connectionType + " connected", Toast.LENGTH_SHORT).show();
    return true;
  }
  else if ( connec.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED
    ||  connec.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED  )
  {
    return false;
  }

  return false;
}

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