android.support.v4.view.ViewPager无法转换为android.support.design.widget.TabLayout

Question

When i connect Tablayout and view pager it causes my app to crash i'm using the latest version of the android support library. How else would i go about making an app with sliding tabs.

 ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
        PagerAdapter pagerAdapter =
                new PagerAdapter(getSupportFragmentManager(),MainActivity.this);
        viewPager.setAdapter(pagerAdapter);


        TabLayout tabLayout = (TabLayout) findViewById(R.id.pager);

Answer 1

It happens because you are using the same id to find the ViewPager and the TabLayout.

   ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
   TabLayout tabLayout = (TabLayout) findViewById(R.id.pager);

In your layout check the right id for the TabLayout.

Answer 2

I fixed the layout by changing the width of CoordinatorLayout to wrap_content and changing the width and height of view pager to wrap_content. I also gave TabLayout its own id.