1：TabLayout 的简单使用

  1;在布局文件中申明,并在TabLayout下面放ViewPager
          <android.support.design.widget.TabLayout
        android:id="@+id/Tablayout1"
        app:tabMode="scrollable"
        app:tabSelectedTextColor="@color/colorPrimary"
        app:tabIndicatorColor="@color/colorPrimary"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />
         <android.support.v4.view.ViewPager
        android:id="@+id/vp_main"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight = "1"
        />
  2:在JAVA文件中找出控件
      mTablayout = (TabLayout) findViewById(R.id.Tablayout1);
      mVp_main = (ViewPager) findViewById(R.id.vp_main);
  3:为ViewPager设置适配器，适配器应该继承FragmentPagerAdapter，大致和普通的ViewPager 适配器差不多，多了最后一个方法，每个ViewPager 页面返回的都是一个Fragment对象。
         public class MainTabAdapter extends FragmentPagerAdapter {

    private List<FirstPagerFragment> mList_fragment ;
    private String[] mList_titlt;

    public MainTabAdapter(FragmentManager fm,List<FirstPagerFragment> List_fragment,String[] List_titlt) {
        super(fm);
        mList_fragment = List_fragment ;
        mList_titlt = List_titlt;
    }

    @Override
    public FirstPagerFragment getItem(int position) {
        return mList_fragment.get(position);
    }

    @Override
    public int getCount() {
        return mList_fragment.size();
    }

    /*
    * 这个是设置页签标题*/
    @Override
    public CharSequence getPageTitle(int position) {
        return mList_titlt[position] ;
    }
}
  4:设置适配器后将TabLayout和ViewPager绑定起来
        //为ViewPager设置适配器
        mVp_main.setAdapter(mTabAdapter);
        //将TabLayout 和ViewPager  绑定起来
        mTablayout.setupWithViewPager(mVp_main);