嵌套操作栏选项卡（带 ViewPager）

Question

我有一个使用操作栏选项卡（带有 ViewPager）的项目。在选项卡之间滑动时，选项卡移动非常顺畅，但我需要在 TAB 2 中添加两个子选项卡，然后移动到下一个选项卡，或者当然返回，就像在 Glassdoor 或 Flipboard 上一样。

请帮忙。

主要活动

public class MainActivity extends AppCompatActivity {


private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;

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

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

    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
    mViewPager = (ViewPager) findViewById(R.id.container);
    mViewPager.setAdapter(mSectionsPagerAdapter);

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

}


public class SectionsPagerAdapter extends FragmentPagerAdapter {

    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {

            switch (position) {
                case 0:
                    return Tab1Fragment.newInstance();
                case 1:
                    return Tab2Fragment.newInstance();
                default:
                    return Tab3Fragment.newInstance();
            }
    }

    @Override
    public int getCount() {
        // Show 3 total pages.
        return 3;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
            case 0:
                return "Tab 1";
            case 1:
                return "Tab 2";
            case 2:
                return "Tab 3";
        }
        return null;
    }
}
}

activity_main.xml

<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="@dimen/appbar_padding_top"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|enterAlways"
        app:popupTheme="@style/AppTheme.PopupOverlay">

    </android.support.v7.widget.Toolbar>

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</android.support.design.widget.AppBarLayout>

<android.support.v4.view.ViewPager
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

Tab2Fragment- 我想嵌套 SubTab1Fragment 和 SubTab2Fragment

public class Tab2Fragment extends Fragment {   
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";


public Tab2Fragment() {
    // Required empty public constructor
}


// TODO: Rename and change types and number of parameters
public static Tab2Fragment newInstance() {
    Tab2Fragment fragment = new Tab2Fragment();

    return fragment;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (getArguments() != null) {

    }
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_tab2, container, false);
}

}

fragment_tab2.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.r3dm4n.testprojectapp.Tab2Fragment">

<!-- TODO: Update blank fragment layout -->
<TextView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:text="@string/hello_blank_fragment" />

Answer 1

看看这个答案可能会有帮助

ViewPager nested in ViewPager

同时添加子标签您可以在监听器中添加这样的条件以移动到下一个标签

if(mPager.getCurrentItem() >=2)
 mParentPager.setCurrentItem()=mParentPager.getCurrenItem()+1

这是为了移动到上一个标签

if(mPager.getCurrentItem() ==0)
 mParentPager.setCurrentItem()=mParentPager.getCurrenItem()-1

Answer 2

我想通了。我还在 Github 上发布了一个演示项目

在 MainActivity 中，你需要 return 一个你想要的新片段 "nested" 像这样：

@Override
    public Fragment getItem(int position) {

        switch (position) {
            case 0:
                return Tab1Fragment.newInstance();
            case 1:
                return new Tab2Fragment();
            default:
                return Tab3Fragment.newInstance();
        }

在 TAB2 片段中，您希望其他嵌套片段的位置进行以下更改：

public class Tab2Fragment extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {


    View view = inflater.inflate(R.layout.fragment_tab2, container, false);
    ViewPager mViewPager = (ViewPager) view.findViewById(R.id.container_main);
    SectionsPagerAdapter mSectionsPagerAdapter = new SectionsPagerAdapter(getChildFragmentManager());
    mViewPager.setAdapter(mSectionsPagerAdapter);

    return view;

}


private class SectionsPagerAdapter extends FragmentPagerAdapter {

    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                return Nest1Fragment.newInstance(1);
            default:
                return Nest2Fragment.newInstance(2);
        }

    }

    @Override
    public int getCount() {
        // Show 4 total pages.
        return 2;
    }

    @Override
    public CharSequence getPageTitle(int position) {

        switch (position) {
            case 0:
                return "Nested 1";
            default:
                return "Nested 2";
        }


    }
}


}

fragment_tab2.xml

<android.support.v4.view.ViewPager
    android:id="@+id/container_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    app:layout_scrollFlags="scroll|enterAlways">

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary" />
    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|enterAlways"
        app:popupTheme="@style/AppTheme.PopupOverlay">
    </android.support.v7.widget.Toolbar>
</android.support.v4.view.ViewPager>

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