java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference

[tangnuo]

04-24 10:20:11.991 30970-30970/com.looklook.xinghongfei.looklook E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.looklook.xinghongfei.looklook, PID: 30970
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
at com.looklook.xinghongfei.looklook.MainActivity.switchFragment(MainActivity.java:270)
at com.looklook.xinghongfei.looklook.MainActivity.access$100(MainActivity.java:49)
at com.looklook.xinghongfei.looklook.MainActivity$1.onNavigationItemSelected(MainActivity.java:131)
at android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:152)
at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:817)
at android.support.v7.view.menu.SubMenuBuilder.dispatchMenuItemSelected(SubMenuBuilder.java:89)
at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:156)
at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:964)
at android.support.design.internal.NavigationMenuPresenter$1.onClick(NavigationMenuPresenter.java:318)
at android.view.View.performClick(View.java:5637)
at android.view.View$PerformClick.run(View.java:22433)
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:6126)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)