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Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference at com.example.nouma.life.FirstFragment.<init>(FirstFragment.java:35) at com.example.nouma.life.MainActivity.onNavigationItemSelected(MainActivity.java:106) at android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:153) at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:810) at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152) at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:957) at android.support.design.internal.NavigationMenuPresenter$1.onClick(NavigationMenuPresenter.java:328) at android.view.View.performClick(View.java:4759) at android.view.View$PerformClick.run(View.java:19770) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5237) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)