java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.closeDrawer(int)' on a null object reference

Stack Overflow | Shantu Das | 5 months ago
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    Android Navigation Drawer with sliding TabView

    Stack Overflow | 5 months ago | Shantu Das
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.closeDrawer(int)' on a null object reference

    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.closeDrawer(int)' on a null object reference

      at com.example.user.navwithtab.MainActivity.onNavigationItemSelected()
    2. com.example.user
      MainActivity.onNavigationItemSelected
      1. com.example.user.navwithtab.MainActivity.onNavigationItemSelected(MainActivity.java:157)
      1 frame
    3. android.support.design
      NavigationView$1.onMenuItemSelected
      1. android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:153)
      1 frame
    4. android.support.v7
      MenuBuilder.performItemAction
      1. android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:810)
      2. android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152)
      3. android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:957)
      3 frames
    5. android.support.design
      NavigationMenuPresenter$1.onClick
      1. android.support.design.internal.NavigationMenuPresenter$1.onClick(NavigationMenuPresenter.java:328)
      1 frame
    6. Android Platform
      Looper.loop
      1. android.view.View.performClick(View.java:5198)
      2. android.view.View$PerformClick.run(View.java:21147)
      3. android.os.Handler.handleCallback(Handler.java:739)
      4. android.os.Handler.dispatchMessage(Handler.java:95)
      5. android.os.Looper.loop(Looper.java:148)
      5 frames