Question

//我动态生成了多个标签，如30个标签，默认情况下，我已按索引选择了特定标签，但我无法自动滚动到该标签以在屏幕上查看

//首先，我通过传递日期和相应的数据列表来调用片段

viewPager = (ViewPager) findViewById(R.id.view_pager);
            tabLayout = (TabLayout) findViewById(R.id.tab_layout);
            tabLayout.setupWithViewPager(viewPager);

FragmentManager fragmentManager = getSupportFragmentManager();
    viewPager.setAdapter(new CalenderFragmentPageAdapter(fragmentManager, MainActivity.this, Finaldates, ProductList));

//然后我通过扩展FragmentStatePagerAdapter

来调用哪个设置tab属性

public class CalenderFragmentPageAdapter extends FragmentStatePagerAdapter {

private ArrayList tabTitle;
Context context;
ArrayList<Map<String, String>> ProductList;
String finalDate;

public CalenderFragmentPageAdapter(FragmentManager fm, Context context, ArrayList<String> str, ArrayList<Map<String, String>> ProductList) {
    super(fm);
    this.context = context;
    tabTitle = str;
    this.ProductList = ProductList;

}

@Override
public Fragment getItem(int position) {

// called new  fragment for each generated tab

    return calenderFragment;
}

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

@Override
public CharSequence getPageTitle(int position) {

   //Title to show on tab

}
}

//然后我最后加载了我想要的选定标签的片段由

TabLayout.Tab tab = tabLayout.getTabAt(selectedTabPos);

//现在我可以通过上面的方法为该标签选择片段，但无法自动滚动我已设置selectedTabPos的标签

//的Xml

 <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"/>
            <android.support.design.widget.TabLayout
                android:id="@+id/tab_layout"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="@color/white"
                app:tabGravity="center"
                app:tabIndicatorColor="@color/colorAccent"
                app:tabMode="scrollable"
                app:tabSelectedTextColor="@color/colorPrimary"
                app:tabTextColor="@color/colorAccent" />
        </android.support.design.widget.AppBarLayout>



        <android.support.v4.view.ViewPager
            android:id="@+id/view_pager"
            android:layout_marginTop="115dp"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </android.support.v4.view.ViewPager>

Answer 1

您必须对其应用水平滚动

<HorizontalScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:scrollbars="none">
    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </android.support.design.widget.TabLayout>
</HorizontalScrollView>
<android.support.v4.view.ViewPager
    android:id="@+id/viewPager_details"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorMyGreen"/>

试试这个......

Answer 2

如果您的TabLayout不可滚动，则可以在XML中为TabLayout添加以下行：

app:tabMode="scrollable"

Answer 3

试试这个：

mTablayout.getTabAt(position).select();

无法自动滚动到该选项卡以在屏幕上查看动态创建的内容

3 个答案: