Android崩溃打开一个片段

Question

A user told me that he can't open a fragment in my application because he get a crash. I have the logcat:

java.lang.NullPointerException
at com.dd.androreboot.devicecontrolfragment.onCreateView(devicecontrolfragment.java:162)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:829)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035)
at android.app.BackStackRecord.run(BackStackRecord.java:635)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1399)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:426)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4921)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
at dalvik.system.NativeStart.main(Native Method)

at line 162 i have this code:

ConnectivityManager connManager = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo mobile = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        datatoggle = (ToggleButton)v.findViewById(R.id.datatoggle); 
        datatoggle.setChecked(mobile.isConnectedOrConnecting()); //line 162

This part of code needs to check if the 3g is connected and if it is, the toggle button state become true. It works in in every device i tryied but not in this one: Galaxy Note 10.1 (p4notewifi). Any helps?

Answer 1

try this:

ConnectivityManager connManager = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo mobile = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
    datatoggle = (ToggleButton)v.findViewById(R.id.datatoggle); 


   if(mobile != null) {
    datatoggle.setChecked(mobile.isConnectedOrConnecting()); //line 162
   } else {
      datatoggle.setChecked(false); //line 162
   }

Answer 2

getNetworkInfo() can return null . Check for non-null before calling a method on it.

Specifically ,

Returns

a NetworkInfo object for the requested network type or null if the type is not supported by the device.