Question

我可以点击标签进行更改，但刷卡时没有任何反应。我没有看到所选标签下面的彩色条。

这是我的代码。我在很大程度上遵循了this教程，但我在StoriesActivity中将tabLayout.setOnTabSelectedListener(this)更改为tabLayout.addOnTabSelectedListener(this)，因为前者已被删除。

StoriesActivity：

public class StoriesActivity extends AppCompatActivity implements TabLayout.OnTabSelectedListener {

    //This is our tablayout
    private TabLayout tabLayout;

    //This is our viewPager
    private ViewPager viewPager;

    private Toolbar toolbar;

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

        /* +++ START Intent +++ */
        Bundle extras = getIntent().getExtras();

        final int authorID = extras.getInt("author_id");
        final String authorName = extras.getString("author_name");
        Log.i("click", Integer.toString(authorID));
        /* +++ END Intent +++ */

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

        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });

        //Initializing the tablayout
        tabLayout = (TabLayout) findViewById(R.id.tab_layout);

        //Adding the tabs using addTab() method
        tabLayout.addTab(tabLayout.newTab().setText("Stories"));
        tabLayout.addTab(tabLayout.newTab().setText("Collections"));
        tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

        //Initializing viewPager
        viewPager = (ViewPager) findViewById(R.id.pager);

        //Creating our pager adapter
        StoriesTabsAdapter adapter = new StoriesTabsAdapter(getSupportFragmentManager(), tabLayout.getTabCount());

        //Adding adapter to pager
        viewPager.setAdapter(adapter);
        viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));

        //Adding onTabSelectedListener to swipe views
        tabLayout.addOnTabSelectedListener(this);

    }

    @Override
    public void onTabSelected(TabLayout.Tab tab) {
        viewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {

    }

    @Override
    public void onTabReselected(TabLayout.Tab tab) {

    }
}

activity_stories.xml：

<RelativeLayout
    android:id="@+id/main_layout"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:background="?attr/colorPrimary"
        android:elevation="6dp"
        android:minHeight="?attr/actionBarSize"
        app:navigationIcon="?attr/homeAsUpIndicator"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

    <android.support.design.widget.TabLayout
        android:id="@+id/tab_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/toolbar"
        android:background="?attr/colorPrimary"
        android:elevation="6dp"
        android:minHeight="?attr/actionBarSize"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="fill_parent"
        android:layout_below="@id/tab_layout"/>

    <ListView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/stories_list_view" />

</RelativeLayout>

StoriesTabsAdapter：

public class StoriesTabsAdapter extends FragmentPagerAdapter {

    int mNumOfTabs;

    public StoriesTabsAdapter(FragmentManager fm, int NumOfTabs) {
        super(fm);
        this.mNumOfTabs = NumOfTabs;
    }

    @Override
    public Fragment getItem(int position) {

        switch (position) {
            case 0:
                StoriesFragment tab1 = new StoriesFragment();
                return tab1;
            case 1:
                CollectionsFragment tab2 = new CollectionsFragment();
                return tab2;
            default:
                return null;
        }

    }

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

}

StoriesFragment：

public class StoriesFragment extends Fragment {

    public StoriesFragment() {
        // Required empty public constructor
    }

    private ListView storiesListView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_stories, container, false);
    }

}

Answer 1

你错过了setupWithViewPager你的TabLayout。

 mTabLayout.setupWithViewPager(mViewPager)

关于您的文字无法显示的问题，请在 setupWithViewPager

之后尝试直接移动下面的代码

        //Adding the tabs using addTab() method
        tabLayout.addTab(tabLayout.newTab().setText("Stories"));
        tabLayout.addTab(tabLayout.newTab().setText("Collections"));
        tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

Answer 2

你应该遵循以下两点。

使用 FragmentStatePagerAdapter 以获得良好的方法。
setupWithViewPager

如果您将ViewPager与此布局一起使用，则可以致电 setupWithViewPager（ViewPager）将两者链接在一起。这个布局将自动从PagerAdapter的页面标题中填充。

其次

_tablayoutOBJ.setupWithViewPager(_viewpagerOBJ); // After addOnTabSelectedListener .

对于演示案例，您可以访问Material Design working with Tabs。

无法在TabLayout中的选项卡之间滑动

2 个答案: