具有MVP的Android TabLayout片段

我正在实现一个MVP应用程序,其中视图是活动中加载的片段。每个活动都有一个片段要显示。我必须更改我的实现并添加现在将显示片段的TabLayout。我尝试了不同的方法将片段传递给适配器,但都会导致我的应用程序崩溃,我无法理解错误。最后一次尝试,我将向适配器传递一个片段的arraylist(目前为1)。在基地,我在跟踪 google samples MVP todo app ,但我需要实现此选项卡布局。拜托,这是我的主要项目,我到处找,这是我最后的选择。

public class HomeActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        Toolbar mHomeToolbar = (Toolbar) findViewById(R.id.toolbar);    // Set to the corresponding Toolbar in the UI.
        setSupportActionBar(mHomeToolbar);

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);    // Set to the corresponding Drawer Layout in the UI.

        ActionBarDrawerToggle mToggle = new ActionBarDrawerToggle(this, mDrawerLayout, mHomeToolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        mDrawerLayout.addDrawerListener(mToggle);   // Set mToggle as Drawer's toggle button and listen to actions.
        mToggle.syncState();

        NavigationView mDrawerNavigationView = (NavigationView) findViewById(R.id.nav_view);    // Set the corresponding Navigation View in the UI.

        mDrawerNavigationView.setNavigationItemSelectedListener(this);  // Add listener on Navigation's items.

        HomeFragment homeFragment = (HomeFragment) getSupportFragmentManager().findFragmentById(R.id.Quests_Frame); // Set to corresponding Fragment View in the UI.

        if (homeFragment == null) {
            homeFragment = HomeFragment.newInstance();
            FragmentLoader.loadFragmentInActivity(getSupportFragmentManager(), homeFragment, R.id.Quests_Frame);    // Display fragment in Activity.
        }

        repo = QuestsRepository.getInstance(QuestsDataSource.getINSTANCE());
        mHomePresenter = new HomePresenter(repo , homeFragment);

        TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
        ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
        TabPagerAdapter adapter = new TabPagerAdapter(getSupportFragmentManager());
        adapter.addFragment(homeFragment);
        viewPager.setAdapter(adapter);

    }

适配器类:

public class TabPagerAdapter extends FragmentPagerAdapter {

    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final int tabCount = 3;

    public TabPagerAdapter(FragmentManager fragmentManager) {
        super(fragmentManager);
    }

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                mFragmentList.get(position);
            default:
                return null;
        }
    }

    public void addFragment(Fragment fragment) {
        mFragmentList.add(fragment);
    }

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