API.15에서 API.29까지 지원하는 2020 년 3 월 현재이 답변에 대한 업데이트가 있습니다. 원래 답변에 따라 찾을 수 있습니다.

2019 년 2 월 답변

온라인 상태인지 확인하려면 :

boolean isOnline() {
    // Checking internet connectivity
    ConnectivityManager connectivityMgr = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = null;
    if (connectivityMgr != null) {
        activeNetwork = connectivityMgr.getActiveNetworkInfo();
    }
    return activeNetwork != null;
}

안드로이드 M 전후에 인터넷 연결 유형을 얻으려면

void internetType() {
    // Checking internet connectivity
    ConnectivityManager connectivityMgr = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = null;
    if (connectivityMgr != null) {
        activeNetwork = connectivityMgr.getActiveNetworkInfo();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            NetworkCapabilities nc = connectivityMgr.getNetworkCapabilities(connectivityMgr.getActiveNetwork());
            if (nc.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                // connected to mobile data
            } else if (nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                // connected to wifi
            }
        } else {
            if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                // connected to wifi
            } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                // connected to mobile data
            }
        }
    }
}

모든 경우에 네트워크 상태에 액세스 할 수있는 권한이 필요합니다

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

2020 년 3 월 업데이트

마찬가지로 NetworkInfo지금부터 더 이상 사용되지 않으며 API 29로 우리가 사용해야하는 ConnectivityManager.NetworkCallback네트워크 상태 변화 onAvailable()및 onLost()콜백.

용법:

• 이 라이브러리 를 사용 하거나이 라이브러리 의 일부인 아래의 유틸리티 클래스를 직접 사용할 수 있습니다.

풍모

• LifeCycle은 LifecycleObserver일부 정리 작업을 수행하여 메모리 누수를 피하도록 구현함으로써 의식이 onDestroy()있습니다.
• API 29 (Ice Cream Sandwich)부터 API 29 (Android Q)까지 지원
• API의 API (21)에 종래의 경우, 사용 상황에 기초 BoradcastReceiver하고 NetworkInfo, 그리고 사용 ConnectivityManager.NetworkCallbackAPI (21) 및 상기 대.
• WiFi와 셀룰러 네트워크가 모두 켜져 있으면 셀룰러 네트워크로 전환하는 동안 WiFi 연결이 끊어지면 연결 리스너가 중단되지 않습니다.
• 셀룰러 네트워크가 켜져 있으면 WiFi가 연결되어 활성 네트워크 일 때 연결 리스너가 중단되지 않습니다 (이것이 선호하는 네트워크이므로).
• 라이브러리를 사용하려는 경우이 권한을 포함 할 필요가 없습니다 android.permission.ACCESS_NETWORK_STATE. 유틸리티 클래스를 사용하려면 포함시켜야합니다.

기능

• 현재 연결 상태 (온라인 / 오프라인)를 가져옵니다.
• 인터넷 연결을 지속적으로 확인 / 청취하고 장치가 오프라인 또는 온라인 상태가되면 콜백을 트리거합니다.
• 활성 인터넷 연결 유형 (WiFi 또는 Cellular)을 가져옵니다.
• 사용 가능한 모든 네트워크 유형 (WiFi 또는 Cellular)을 가져옵니다. >> API 21 이상에서만 지원
• 사용 가능한 모든 네트워크 수 확보 >> API 21 이상에서만 지원

@RequiresApi(api = Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
public class ConnectionUtil implements LifecycleObserver {

    private static final String TAG = "LOG_TAG";
    private ConnectivityManager mConnectivityMgr;
    private Context mContext;
    private NetworkStateReceiver mNetworkStateReceiver;

    /*
     * boolean indicates if my device is connected to the internet or not
     * */
    private boolean mIsConnected = false;
    private ConnectionMonitor mConnectionMonitor;


    /**
     * Indicates there is no available network.
     */
    private static final int NO_NETWORK_AVAILABLE = -1;


    /**
     * Indicates this network uses a Cellular transport.
     */
    public static final int TRANSPORT_CELLULAR = 0;


    /**
     * Indicates this network uses a Wi-Fi transport.
     */
    public static final int TRANSPORT_WIFI = 1;


    public interface ConnectionStateListener {
        void onAvailable(boolean isAvailable);
    }


    public ConnectionUtil(Context context) {
        mContext = context;
        mConnectivityMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        ((AppCompatActivity) mContext).getLifecycle().addObserver(this);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            mConnectionMonitor = new ConnectionMonitor();
            NetworkRequest networkRequest = new NetworkRequest.Builder()
                    .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
                    .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
                    .build();
            mConnectivityMgr.registerNetworkCallback(networkRequest, mConnectionMonitor);
        }

    }


    /**
     * Returns true if connected to the internet, and false otherwise
     *
     * <p>
     * NetworkInfo is deprecated in API 29
     * https://developer.android.com/reference/android/net/NetworkInfo
     * <p>
     * getActiveNetworkInfo() is deprecated in API 29
     * https://developer.android.com/reference/android/net/ConnectivityManager#getActiveNetworkInfo()
     * <p>
     * getNetworkInfo(int) is deprecated as of API 23
     * https://developer.android.com/reference/android/net/ConnectivityManager#getNetworkInfo(int)
     */
    public boolean isOnline() {

        mIsConnected = false;

        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P) {
            // Checking internet connectivity
            NetworkInfo activeNetwork = null;
            if (mConnectivityMgr != null) {
                activeNetwork = mConnectivityMgr.getActiveNetworkInfo(); // Deprecated in API 29
            }
            mIsConnected = activeNetwork != null;

        } else {
            Network[] allNetworks = mConnectivityMgr.getAllNetworks(); // added in API 21 (Lollipop)

            for (Network network : allNetworks) {
                NetworkCapabilities networkCapabilities = mConnectivityMgr.getNetworkCapabilities(network);
                if (networkCapabilities != null) {
                    if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
                            || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)
                            || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET))
                        mIsConnected = true;
                }
            }
        }

        return mIsConnected;

    }


    /**
     * Returns
     * <p> <p>
     * <p><p> NO_NETWORK_AVAILABLE >>> when you're offline
     * <p><p> TRANSPORT_CELLULAR >> When Cellular is the active network
     * <p><p> TRANSPORT_WIFI >> When Wi-Fi is the Active network
     * <p>
     */
    public int getActiveNetwork() {

        NetworkInfo activeNetwork = mConnectivityMgr.getActiveNetworkInfo(); // Deprecated in API 29
        if (activeNetwork != null)

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                NetworkCapabilities capabilities = mConnectivityMgr.getNetworkCapabilities(mConnectivityMgr.getActiveNetwork());
                if (capabilities != null)
                    if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                        // connected to mobile data
                        return TRANSPORT_CELLULAR;

                    } else if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                        // connected to wifi
                        return TRANSPORT_WIFI;
                    }

            } else {
                if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) { // Deprecated in API 28
                    // connected to mobile data
                    return TRANSPORT_CELLULAR;

                } else if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) { // Deprecated in API 28
                    // connected to wifi
                    return TRANSPORT_WIFI;
                }
            }
        return NO_NETWORK_AVAILABLE;
    }


    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public int getAvailableNetworksCount() {

        int count = 0;

        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
            Network[] allNetworks = mConnectivityMgr.getAllNetworks(); // added in API 21 (Lollipop)
            for (Network network : allNetworks) {
                NetworkCapabilities networkCapabilities = mConnectivityMgr.getNetworkCapabilities(network);
                if (networkCapabilities != null)
                    if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
                            || networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR))
                        count++;
            }

        }

        return count;
    }


    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public List<Integer> getAvailableNetworks() {

        List<Integer> activeNetworks = new ArrayList<>();

        Network[] allNetworks; // added in API 21 (Lollipop)
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
            allNetworks = mConnectivityMgr.getAllNetworks();
            for (Network network : allNetworks) {
                NetworkCapabilities networkCapabilities = mConnectivityMgr.getNetworkCapabilities(network);
                if (networkCapabilities != null) {
                    if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI))
                        activeNetworks.add(TRANSPORT_WIFI);

                    if (networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR))
                        activeNetworks.add(TRANSPORT_CELLULAR);

                }
            }
        }

        return activeNetworks;
    }


    public void onInternetStateListener(ConnectionStateListener listener) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            mNetworkStateReceiver = new NetworkStateReceiver(listener);
            IntentFilter intentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
            mContext.registerReceiver(mNetworkStateReceiver, intentFilter);

        } else {
            mConnectionMonitor.setOnConnectionStateListener(listener);
        }
    }


    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
    public void onDestroy() {
        Log.d(TAG, "onDestroy");
        ((AppCompatActivity) mContext).getLifecycle().removeObserver(this);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            if (mConnectionMonitor != null)
                mConnectivityMgr.unregisterNetworkCallback(mConnectionMonitor);
        } else {
            if (mNetworkStateReceiver != null)
                mContext.unregisterReceiver(mNetworkStateReceiver);
        }

    }


    public class NetworkStateReceiver extends BroadcastReceiver {

        ConnectionStateListener mListener;

        public NetworkStateReceiver(ConnectionStateListener listener) {
            mListener = listener;
        }

        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getExtras() != null) {

                NetworkInfo activeNetworkInfo = mConnectivityMgr.getActiveNetworkInfo(); // deprecated in API 29

                /*
                 * activeNetworkInfo.getState() deprecated in API 28
                 * NetworkInfo.State.CONNECTED deprecated in API 29
                 * */
                if (!mIsConnected && activeNetworkInfo != null && activeNetworkInfo.getState() == NetworkInfo.State.CONNECTED) {
                    Log.d(TAG, "onReceive: " + "Connected To: " + activeNetworkInfo.getTypeName());
                    mIsConnected = true;
                    mListener.onAvailable(true);

                } else if (intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, Boolean.FALSE)) {
                    if (!isOnline()) {
                        mListener.onAvailable(false);
                        mIsConnected = false;
                    }

                }

            }
        }
    }


    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public class ConnectionMonitor extends ConnectivityManager.NetworkCallback {

        private ConnectionStateListener mConnectionStateListener;

        void setOnConnectionStateListener(ConnectionStateListener connectionStateListener) {
            mConnectionStateListener = connectionStateListener;
        }

        @Override
        public void onAvailable(@NonNull Network network) {

            if (mIsConnected)
                return;

            Log.d(TAG, "onAvailable: ");

            if (mConnectionStateListener != null) {
                mConnectionStateListener.onAvailable(true);
                mIsConnected = true;
            }

        }

        @Override
        public void onLost(@NonNull Network network) {

            if (getAvailableNetworksCount() == 0) {
                mConnectionStateListener.onAvailable(false);
                mIsConnected = false;
            }

        }

    }

}

답변

@Suppress("DEPRECATION")
fun isNetworkAvailable(context: Context): Boolean {
    try {
        val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        return if (Build.VERSION.SDK_INT > 22) {
            val an = cm.activeNetwork ?: return false
            val capabilities = cm.getNetworkCapabilities(an) ?: return false
            capabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
        } else {
            val a = cm.activeNetworkInfo ?: return false
            a.isConnected && (a.type == ConnectivityManager.TYPE_WIFI || a.type == ConnectivityManager.TYPE_MOBILE)
        }
    } catch (e: Exception) {
        e.printStackTrace()
    }
    return false
}