tabLayout+viewpager实现tab control

Gradle中添加support依赖

compile 'com.android.support:design:25.3.1'

布局文件添加viewpager和tablayout

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="hn.com.demojni.MainActivity">

    <android.support.v4.view.ViewPager
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:id="@+id/viewPager"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/tabBottom">
    </android.support.v4.view.ViewPager>
    <android.support.design.widget.TabLayout
        android:id="@+id/tabBottom"
        android:layout_width="0dp"
        android:layout_height="48dp"
        android:background="@color/colorPrimary"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent">
    </android.support.design.widget.TabLayout>
</android.support.constraint.ConstraintLayout>

private MyPageAdapter mMyPageAdapter;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        getSupportActionBar().setTitle("tabDemo");
        setContentView(R.layout.activity_main);
        initUI();
    }

    private void initUI(){
        TabLayout tabBottom = (TabLayout) findViewById(R.id.tabBottom);

        ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
        viewPager.setOffscreenPageLimit(2);
        FragmentManager manager = getSupportFragmentManager();
        viewPager.setAdapter(new MyPageAdapter(manager));
        viewPager.setCurrentItem(0);

        tabBottom.setupWithViewPager(viewPager);

        int tabCount =tabBottom.getTabCount();
        for(int i=0;i<tabCount;i++){
            tabBottom.getTabAt(i).setIcon(R.drawable.ic_home_white_24dp);

        }
    }

    public static class MyPageAdapter extends FragmentPagerAdapter{
        public MyPageAdapter(FragmentManager manager){
            super(manager);
        }
        @Override
        public Fragment getItem(int position) {
            switch (position){
                case 0:
                {
                    return Fragment1.newInstance();
                }
                case 1:
                {
                    return Fragment2.newInstance();
                }
                case 2:
                {
                    return Fragment3.newInstance();
                }
                default:
                    return  null;
            }

        }

        @Override
        public int getCount() {
            return 3;
        }
    }

调用setupWithViewPager把tablayout和viewpager关联起来。

public class Fragment1 extends Fragment {
    private static final String TAG = "Fragment1";
    public static Fragment1 newInstance(){
        Fragment1 fragment1 = new Fragment1();
        return fragment1;
    }
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);
        View view = inflater.inflate(R.layout.fragment_1, null);
        return view;
    }

}

一个简单的tab控制器完成了。