Question

我使用此方法ping go google服务器，因此我可以检查有效的internet连接，但我发现它并不适用于所有设备。

我尝试过使用HttpURLConnection和URLConnection等其他方法，但即使我已经连接，它们都会返回false。

适用于所有设备的任何想法或解决方案。提前谢谢。我将连续发布我已经尝试过的内容。

方法1：

public static Boolean isOnline() {
    try {
        Process p1 = java.lang.Runtime.getRuntime().exec("ping -c 1 8.8.8.8");
        int returnVal = p1.waitFor();
        return (returnVal == 0);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return false;
}

我已尝试在本地和谷歌服务器上使用它，它可以产生完美的效果。问题是它无法在所有设备上运行。

方法2：

public boolean isConnected() {
    boolean connectivity;
    try {
        URL url = new URL("www.google.com");
        URLConnection conn = url.openConnection();
        conn.setConnectTimeout(5000);
        conn.connect();
        connectivity = true;
    } catch (Exception e) {
        connectivity = false;
    }
    return connectivity;
}

尽管我的连接处于活动状态，但这个返回false。

方法3：

public static boolean isInternetReachable() {
    try {
        //make a URL to a known source
        URL url = new URL("http://www.google.co.ke");

        //open a connection to that source
        HttpURLConnection urlConnect = (HttpURLConnection) url.openConnection();

        Object objData = urlConnect.getContent();

    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }

    return true;
}

与此相同。虚假值。

最后一个是这个班级，但它也做了同样的事情：

class TestInternet extends AsyncTask<Void, Void, Boolean> {
    @Override
    protected Boolean doInBackground(Void... params) {
        try {
            URL url = new URL("http://www.google.com");
            HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
            urlc.setConnectTimeout(3000);
            urlc.connect();
            if (urlc.getResponseCode() == 200) {
                connected = true;
                return connected;
            }
        } catch (MalformedURLException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
            connected = false;
            return connected;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            connected = false;
            return connected;
        }
        return connected;
    }

    @Override
    protected void onPostExecute(Boolean result) {
        if (!result) { // code if not connected
            AlertDialog.Builder builder = new AlertDialog.Builder(CtgActivity.this);
            builder.setMessage("An internet connection is required.");
            builder.setCancelable(false);

            builder.setPositiveButton(
                    "TRY AGAIN",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            dialog.cancel();
                            new TestInternet().execute();
                        }
                    });


            AlertDialog alert11 = builder.create();
            alert11.show();
        } else { // code if connected
            Toast.makeText(CtgActivity.this,"Yes",Toast.LENGTH_LONG).show();
        }
    }

    @Override
    protected void onPreExecute() {
        Toast.makeText(getBaseContext(),"Checking for internet",Toast.LENGTH_LONG).show();
        super.onPreExecute();
    }
}

我经历过这样的事情，找到了我能做的一切，但一切都围绕着这些。请告诉我，如果这是我做错了或建议更好的解决方法。它是我项目的最后一步。

Answer 1

第1步：创建连接检测器

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

import java.net.HttpURLConnection;
import java.net.URL;


    /**
     * Created by Ramana Tech Architect 2/24/2018.
     */

    public class ConnectionDetector {

    private Context _context;

    public ConnectionDetector(Context context) {
        this._context = context;
    }

    public boolean isConnectingToInternet() {
        ConnectivityManager cm = (ConnectivityManager) this._context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        if (activeNetwork != null) { // connected to the internet
                try {
                    URL url = new URL("http://www.google.com");
                    HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
                    urlc.setConnectTimeout(300);
                    urlc.connect();
                    if (urlc.getResponseCode() == 200) {
                        return true;
                    }
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    return false;
                }
        }
        return false;
    }
}

第2步：使用ConnectionDetector

private ConnectionDetector cd;

        cd = new ConnectionDetector(getApplicationContext());

        if (cd.isConnectingToInternet()) {
             /// block of code 
          }

测试输出：

我用wifi和移动连接，因此在log 2次输出为真。我在第3行断开了wifi的错误

Answer 2

按照以下代码检查互联网是否可用，以及是否有效。

   //I have taken dummy icon from server, so it may be removed in future. So you can place one small icon on server and then access your own URL.

<强> 1。在清单文件中指定权限，同时确保marshmellwo运行时权限句柄。因为我不会在这里显示重新获得许可。

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

<强> 2。检查互联网可用性以及状态是活动还是非活动。

        public class InternetDemo extends Activity
        {
            @Override
            protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

                checkInternetAvailibility();
            }

            public void checkInternetAvailibility()
            {
                if(isInternetAvailable())
                {
                    new IsInternetActive().execute();
                }
                else {
                    Toast.makeText(getApplicationContext(), "Internet Not Connected", Toast.LENGTH_LONG).show();
                }
            }

            public boolean isInternetAvailable() {
                try {
                    ConnectivityManager connectivityManager
                            = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
                    NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
                    return activeNetworkInfo != null && activeNetworkInfo.isConnected();
                } catch (Exception e) {

                    Log.e("isInternetAvailable:",e.toString());
                    return false;
                }
            }

            class IsInternetActive extends AsyncTask<Void, Void, String>
            {
                InputStream is = null;
                String json = "Fail";

                @Override
                protected String doInBackground(Void... params) {
                    try {
                        URL strUrl = new URL("http://icons.iconarchive.com/icons/designbolts/handstitch-social/24/Android-icon.png");
                        //Here I have taken one android small icon from server, you can put your own icon on server and access your URL, otherwise icon may removed from another server.

                        URLConnection connection = strUrl.openConnection();
                        connection.setDoOutput(true);
                        is =  connection.getInputStream();
                        json = "Success";

                    } catch (Exception e) {
                        e.printStackTrace();
                        json = "Fail";
                    }
                    return json;

                }

                @Override
                protected void onPostExecute(String result) {
                    if (result != null)
                    {
                       if(result.equals("Fail"))
                       {
                           Toast.makeText(getApplicationContext(), "Internet Not Active", Toast.LENGTH_LONG).show();
                       }
                       else
                       {
                           Toast.makeText(getApplicationContext(), "Internet Active " + result, Toast.LENGTH_LONG).show();
                       }
                    }
                    else
                    {
                        Toast.makeText(getApplicationContext(), "Internet Not Active", Toast.LENGTH_LONG).show();
                    }
                }

                @Override
                protected void onPreExecute() {
                    Toast.makeText(getBaseContext(),"Validating Internet",Toast.LENGTH_LONG).show();
                    super.onPreExecute();
                }
            }
        }

Answer 3

在您的包裹上创建ProjectUtils班级：

不要忘记添加你的Menifests

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

ProjectUtils.java：

public class ProjectUtils {

    Context context;

    public ProjectUtils(Context context) {
        this.context = context;
    }



    public boolean haveNetworkConnection() {

        boolean haveConnectedWifi = false;
        boolean haveConnectedMobile = false;

        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo[] netInfo = cm.getAllNetworkInfo();
        for (NetworkInfo ni : netInfo) {
            if (ni.getTypeName().equalsIgnoreCase("WIFI"))
                if (ni.isConnected())
                    haveConnectedWifi = true;
            if (ni.getTypeName().equalsIgnoreCase("MOBILE"))
                if (ni.isConnected())
                    haveConnectedMobile = true;
        }
        return haveConnectedWifi || haveConnectedMobile;
    }

    public void showtoast(String text) {
        Toast.makeText(context, text, Toast.LENGTH_SHORT).show();
    }

}

在活动中

  ProjectUtils utils;

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

        utils = new ProjectUtils(this);

             if (utils.haveNetworkConnection()) {
                   jsonRequestCall();
                } else {
                     utils.showtoast("Internet Connection Not Available");
                }

    }

如果您想在几秒钟内检查互联网连接那么您必须使用 BroadcastReceiver 。

参考：

如何测试android中的活动Internet连接

3 个答案: