Question

首先，我搜索了很多，但解决方案没有用，所以我来这里寻求帮助。使用的设计库是23.1.1

// MainActivity

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

// main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">

<fragment
    class = "com.tablayoutfragmenttest.FragmentTest"
    android:id="@+id/hahah"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

</LinearLayout>

//片段

public class FragmentTest extends Fragment {

private TabLayout mTablayout;
private ViewPager mVp;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    View v = inflater.inflate(R.layout.fragment, container, false);
    mTablayout = (TabLayout)v.findViewById(R.id.bizfrag_tabs_id);
    mTablayout.setTabMode(TabLayout.MODE_SCROLLABLE);
    mVp = (ViewPager)v.findViewById(R.id.bizfrag_vp_id);
    mVp.setAdapter(new MyAdapter(getChildFragmentManager()));
    mVp.setOffscreenPageLimit(0);
    //mTablayout.setupWithViewPager(mVp);
    //mTablayout.post(new Runnable() {
    //        @Override
    //        public void run() {
    //                if (ViewCompat.isLaidOut(mTablayout)) {
    //                    mTablayout.setupWithViewPager(mVp);
    //                } else {
    //                    mTablayout.addOnLayoutChangeListener(
    //                         new  View.OnLayoutChangeListener() {
    //                            @Override
    //                            public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
    //                            mTablayout.setupWithViewPager(mVp);
    //                            
    //                        mTablayout.removeOnLayoutChangeListener(this);
    //                        }
    //                    });
    //                }
    //            }
    //        });


    return v;
}

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

    mTablayout.post(new Runnable() {
        @Override
        public void run() {
            mTablayout.setupWithViewPager(mVp);

        }
    });
}
}

// fragment.xml之

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical">
    <android.support.design.widget.TabLayout
        android:id="@+id/bizfrag_tabs_id"
        android:layout_width="match_parent"
        android:layout_height="40dp"/>

    <android.support.v4.view.ViewPager
        android:id="@+id/bizfrag_vp_id"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

// ViewPager的适配器

public class MyAdapter extends FragmentStatePagerAdapter {

    public static String[] totalPossibleTabs = new String[]{"this is tab0", "this is tab1", "this is tab2", "this is tab3", "this is tab4", "this is tab5", "this is tab6", "this is tab7", "this is tab8", "this is tab9"};

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

    @Override
    public Fragment getItem(int position) {
        return new Fragment();
    }

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

    @Override
    public CharSequence getPageTitle(int position) {
        return totalPossibleTabs[position];
    }
}

当我运行应用程序并滑动页面时，问题如下： the tab's indicator is in wrong position

Answer 1

试试这个： -

if (ViewCompat.isLaidOut(tabLayout)) {
    mTablayout.setupWithViewPager(viewPager);
} else {
    tabLayout.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
        @Override
        public void onLayoutChange(...) {
            mTablayout.setupWithViewPager(viewPager);

            mTablayout.removeOnLayoutChangeListener(this);
        }
    });
}

而不是： -

 mTablayout.post(new Runnable() {
    @Override
    public void run() {
        mTablayout.setupWithViewPager(mVp);

    }
});

Answer 2

谢谢大家，我终于明白了这一点，我们就是无法使用

new Fragment();

在这种情况下为简单起见，把它改成你自己的片段。

android TabLayout和ViewPager在片段

2 个答案: