检查是否有 ACTIVE Internet 连接 [英] Checking if there is an ACTIVE Internet Connection

问题描述

我一直在忙于 Android 开发，并且在尝试检查是否有 ACTIVE Internet 连接时遇到了一些麻烦，即使网络已打开.

I am have been fiddling with Android development and I have been having some trouble trying to check if there is an ACTIVE Internet connection even if the net is ON.

因为有时即使您已连接到 WIFI 或 DATA，有时也无法连接.

Since sometimes even though you are connected to the WIFI or DATA there are times there would be no connection.

每次我点击按钮时，我的应用程序都会崩溃.我对布尔方法还是个菜鸟.

Every time I click the button my app crashes. I am still a noob regarding boolean methods.

提前感谢您的任何帮助，如果你们想到任何更好的方法我可以解决这个问题，我将不胜感激 :D

Thanks for any help in advance and if you guys think of any better ways I could approach this I would be grateful :D

这是我的主要活动:

  @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

btnCheck = (Button) findViewById(R.id.btnCheck);

    btnCheck.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if (isInternetAvailable()){
                Toast.makeText(MainActivity.this, "There is a connection", Toast.LENGTH_SHORT).show();
            }
            else{
                Toast.makeText(MainActivity.this, "NO connection", Toast.LENGTH_SHORT).show();
            }

        }
    });

}

public boolean isInternetAvailable() {
   try {
        int timeoutMs = 1500;
        Socket sock = new Socket();
        SocketAddress sockaddr = new InetSocketAddress("8.8.8.8", 80);

        sock.connect(sockaddr, timeoutMs);
        sock.close();

        return true;
    } catch (IOException e) { return false; }

}

推荐答案

试试下面的代码

 Boolean isInternetPresent = false;
    ConnectionDetector cd;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    btnCheck = (Button) findViewById(R.id.btnCheck);

    btnCheck.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {


            cd = new ConnectionDetector(getApplicationContext());
            isInternetPresent = cd.isConnectingToInternet();

            if (isInternetPresent) {

                Toast.makeText(MainActivity.this, "There is a connection", Toast.LENGTH_SHORT).show();

            }else {

              Toast.makeText(MainActivity.this, "NO connection", Toast.LENGTH_SHORT).show();

                }

            }
        });

    }

也不要忘记在清单文件中添加互联网权限.

also don't forget to add internet permission in manifest file.

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