Android ConnectivityManager.getNetworkInfo() NullPointerException

ConnectivityManager.getNetworkInfo() NullPointerException

디바이스 : 태블릿 Galaxy Tab S2 (SM-T813)

OS : Android

OS Version: 7.0

특징 : SM-T815N0 은 괜찮음.

ConnectivityManager connectivityManager = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo mobile = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
NetworkInfo wifi = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

Error

Process: com.iofit.tablet, PID: 26117

java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.net.NetworkInfo.isConnected()' on a null object reference

    at com.iofit.tablet.ui.fragment.SwingVideoFragment$ProSwingAdapter$2.onClick(SwingVideoFragment.java:952)

    at android.view.View.performClick(View.java:6257)

    at android.view.View$PerformClick.run(View.java:23705)

    at android.os.Handler.handleCallback(Handler.java:751)

    at android.os.Handler.dispatchMessage(Handler.java:95)

    at android.os.Looper.loop(Looper.java:154)

    at android.app.ActivityThread.main(ActivityThread.java:6780)

    at java.lang.reflect.Method.invoke(Native Method)

    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1496)

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1386)

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참고 사이트 : https://developer.android.com/training/basics/network-ops/managing.html