在MVVM体系结构中使用Tab布局和数据绑定库

我正在开发一个具有标签布局作为图像的应用程序.

我想将MVVM架构与数据绑定库一起使用,但我是这个框架的新手.

我可以通过使用ViewPager作为此示例的常规设置选项卡布局而不使用MVVM来执行此操作.

没有MVVM和数据绑定的常规选项卡布局:

activity_main.xml中:

MainActivity.java:

public class MainActivity extends AppCompatActivity {

private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    viewPager = (ViewPager) findViewById(R.id.viewpager);
    setupViewPager(viewPager);

    tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(viewPager);
}

private void setupViewPager(ViewPager viewPager) {
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new OneFragment(), "ONE");
    adapter.addFragment(new TwoFragment(), "TWO");
    adapter.addFragment(new ThreeFragment(), "THREE");
    viewPager.setAdapter(adapter);
}

class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List mFragmentList = new ArrayList<>();
    private final List mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

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

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }
}

}

MVVM中的标签布局:

将MVVM与数据绑定库一起使用时,我们必须使用选项卡布局视图的视图模型.

我不知道如何在XML和视图模型中设置标签布局.如何使用数据绑定库处理诸如"点击布局的一个选项卡"之类的事件

有没有使用数据绑定库在MVVM中使用Tab布局的示例？

谢谢你的帮助.

主要活动 -

public class MainActivity extends Activity 
{
    @Override
    protected void onCreate(@Nullable final Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        App.get(this).component().inject(this);
        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        binding.setHandler(this);
        binding.setManager(getSupportFragmentManager());
    }

    @BindingAdapter({"bind:handler"})
    public static void bindViewPagerAdapter(final ViewPager view, final MainActivity activity)
    {
        final MainActionsAdapter adapter = new MainActionsAdapter(view.getContext(), activity.getSupportFragmentManager());
        view.setAdapter(adapter);
    }

    @BindingAdapter({"bind:pager"})
    public static void bindViewPagerTabs(final TabLayout view, final ViewPager pagerView)
    {
        view.setupWithViewPager(pagerView, true);
    }

}

xml -

适配器 -

public class MainSectionsAdapter extends FragmentPagerAdapter
{
    private static final int CONTACTS = 0;
    private static final int CALLS = 1;
    private static final int CHATS = 2;

    private static final int[] TABS = new int[]{CONTACTS, CALLS, CHATS};

    private Context mContext;

    public MainSectionsAdapter(final Context context, final FragmentManager fm)
    {
        super(fm);
        mContext = context.getApplicationContext();
    }

    @Override
    public Fragment getItem(int position)
    {
        switch (TABS[position])
        {
            case CONTACTS:
                return ContactsFragment.newInstance();
            case CALLS:
                return CallsFragment.newInstance();
            case CHATS:
                return ChatsFragment.newInstance();
        }
        return null;
    }

    @Override
    public int getCount()
    {
        return TABS.length;
    }

    @Override
    public CharSequence getPageTitle(int position)
    {
        switch (TABS[position])
        {
            case CONTACTS:
                return mContext.getResources().getString(R.string.contacts);
            case CALLS:
                return mContext.getResources().getString(R.string.calls);
            case CHATS:
                return mContext.getResources().getString(R.string.chats);
        }
        return null;
    }
}