java.lang.NullPointerException: Android Attempt to invoke virtual method error

Question

My android webview fragment app is getting crashed, after i have added a button to go from one fragment to another, the error on the console is:

E/AndroidRuntime         


        

Answer 1

Try below:

@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
    mActivity = activity;
}

and then to prevent leaks:

@Override
public void onDetach() {
    super.onDetach();
    mContext = null;
}

Now to use MainActivity do:

((MainActivity)mContext).setUrl(url);