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Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.design.widget.TabLayout.addOnTabSelectedListener(android.support.design.widget.TabLayout$OnTabSelectedListener)' on a null object reference

Declared this before onCreate():

TabLayout.OnTabSelectedListener listener;

and this in onCreate():

TabLayout tabLayout = (TabLayout) findViewById(R.id.tabLayout);
listener = new TabLayout.OnTabSelectedListener(){
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            viewPager.setCurrentItem(tab.getPosition());
        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {

        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {

        }
    };
    tabLayout.addOnTabSelectedListener(listener);

I'm having trouble seeing how listener is null. I have other NullPointerExceptions that even claim null object on primitives including ints defined by drawable pngs?

user6576967
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1 Answers1

1

You forgot to set the layout to setContentView()

JoxTraex
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