用于检查 Internet 连接的布尔方法仅返回 false

Question

在我的应用程序中，我正在使用 WIFI 或移动数据连接检查手机是否已连接到互联网，但问题是我的代码始终显示无法通过我的设备连接到 WIFI 进行互联网连接。

这是我检查互联网连接的代码。

public class InternetDetector {
     private Context mcontext;

public InternetDetector(Context context) {
    this.mcontext = context;
}


    public boolean checkMobileInternetConn() {
        ConnectivityManager connectivity = (ConnectivityManager) mcontext
                .getSystemService(Context.CONNECTIVITY_SERVICE);

        if (connectivity != null) {
            NetworkInfo info = connectivity.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

            if (info != null) {
                if (info.isConnected()) {
                    return true;
                }
            }
        }

        else if (connectivity != null) {
            NetworkInfo info = connectivity.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

            if (info != null) {
                if (info.isConnected()) {
                    return true;
                }
            }
        }


        return false;
    }


}

这就是我在其他活动中使用此 class 来检查 connection.But 代码始终转到 else 部分并始终显示 toast 的方式。

if (allValid) {

         isConnectionExist = internetDetector.checkMobileInternetConn();
           if (isConnectionExist) {

              try {
                   new MyAsyncClass().execute();

                   } catch (Exception ex) {
                     Toast.makeText(getApplicationContext(), ex.toString(), Toast.LENGTH_SHORT).show();
                            }

                        } else {
                            Toast.makeText(getApplicationContext(), "No Internet Connection", Toast.LENGTH_SHORT).show();
                        }


                    }

我在清单文件下授予的权限是：-

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

Answer 1

替代解决方案：

public boolean hasConnectivity() {
      ConnectivityManager connectivityManager = (ConnectivityManager) 
      context.getSystemService(Context.CONNECTIVITY_SERVICE);
      NetworkInfo activeNetwork = connectivityManager.getActiveNetworkInfo();
      return activeNetwork != null;
}

Answer 2

我用 hasConnectivity()

替换了 isConnectionExist 变量

if (allValid) {


       if (hasConnectivity()) {

          try {
               new MyAsyncClass().execute();

               } catch (Exception ex) {
                 Toast.makeText(getApplicationContext(), ex.toString(), Toast.LENGTH_SHORT).show();
                        }

                    } else {
                        Toast.makeText(getApplicationContext(), "No Internet Connection", Toast.LENGTH_SHORT).show();
                    }


                }

Answer 3

fun isOnline(context: Context): Boolean {
        try {
            val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
            val nInfo = cm.activeNetworkInfo
            return nInfo != null && nInfo.isConnected
        } catch (e: Exception) {
            e.printStackTrace()
            return false
        }

    }

用于检查 Internet 连接的布尔方法仅返回 false

Boolean Method for checking Internet Connectivity returning only false

java

android

android-connectivitymanager