Tablayout实现页面切换

布局。。。需要导design的包

activity中的代码块

public class MainActivity extends AppCompatActivity {

    private ViewPager pager;
    private ArrayList list;
    private TabLayout tabLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tabLayout = findViewById(R.id.table);
        pager = findViewById(R.id.view_pager);
        //第四部：写页面
        list = new ArrayList<>();
        list.add(new fragment());
        list.add(new fragment1());
        //第五步 导航栏数据
        String [] str={"首页","我的"};
        MyAdapter myAdapter=new MyAdapter(getSupportFragmentManager(), list,str);
        pager.setAdapter(myAdapter);
        //关联方法
        tabLayout.setupWithViewPager(pager);
    }
}

Adapter中的代码

public class MyAdapter extends FragmentPagerAdapter {

    private ArrayList list;
    private String[] str;

    public MyAdapter(FragmentManager fm, ArrayList list, String[] str) {
        super(fm);
        this.list = list;
        this.str = str;
    }

    @Override
    public Fragment getItem(int i) {
        return list.get(i);
    }

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

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        //返回数组
        return str[position];

    }