Android Studio 单击选项卡时,TabLayout指示器未更改位置

au9on6nz  于 2022-11-16  发布在  Android
关注(0)|答案(1)|浏览(199)

在我的另一个片段有类似的TabLayout和ViewPager2架构,但该片段的TabLayout工作正常。这个问题只发生在点击标签,但滑动页面在ViewPager2的指示器工作正常,如果我点击标签,然后滑动到其他页面的指示器也会工作正常。我的代码有什么问题吗?
xml中的选项卡布局和ViewPager2:

<com.google.android.material.tabs.TabLayout
        android:id="@+id/mTabLayout"
        style="@style/MyTabStyle2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/light_gray_1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:tabGravity="fill"
        tools:ignore="SpeakableTextPresentCheck"
        tools:layout_height="50dp">
    </com.google.android.material.tabs.TabLayout>

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/mViewPager"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/light_gray_1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/mTabLayout" />

下面是放置TabLayout和ViewPager2片段:

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    initAdapter();
    initViewPager();
    initTabLayout();
}
private void initAdapter() {
    titlesList.add(getString(R.string.message_tab_multi));
    titlesList.add(getString(R.string.message_tab_single));
    titlesList.add(getString(R.string.message_tab_welcome));
    productPagerAdapter = new MessagePager2Adapter(this);
}

public void initViewPager() {
    mViewPager.setAdapter(productPagerAdapter);
    mViewPager.setOffscreenPageLimit(titlesList.size());
}

public void initTabLayout() {
    new TabLayoutMediator(mTabLayout, mViewPager, (tab, position) ->
            tab.setText(titlesList.get(position))).attach();
}

private class MessagePager2Adapter extends FragmentStateAdapter {

    public MessagePager2Adapter(@NonNull FragmentActivity fragmentActivity) {
        super(fragmentActivity);
    }

    public MessagePager2Adapter(@NonNull Fragment fragment) {
        super(fragment);
    }

    public MessagePager2Adapter(@NonNull FragmentManager fragmentManager, @NonNull Lifecycle lifecycle) {
        super(fragmentManager, lifecycle);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {
        switch (position) {
            default:
            case TAB_MESSAGE_MULTI:
                return MessagePostMultiFragment.newInstance();
            case TAB_MESSAGE_SINGLE:
                return MessagePostSingleFragment.newInstance();
            case TAB_MESSAGE_WELCOME:
                return MessagePostWelcomeFragment.newInstance();
        }
    }

    @Override
    public int getItemCount() {
        return titlesList.size();
    }
}

问题图像和视频:Click tab at position 1(click position 1 but indicator still at position 0)video显示器
下面是另一个片段架构:
xml中的选项卡布局和ViewPager2:

<com.google.android.material.tabs.TabLayout
    android:id="@+id/mTabLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    style="@style/MyTabStyle"
    app:tabGravity="fill"
    android:background="@color/light_gray_2"
    tools:layout_height="50dp"/>

<androidx.viewpager2.widget.ViewPager2
    android:id="@+id/mViewPager"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:background="@color/light_gray_1"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/mTabLayout" />

放置TabLayout和ViewPager2片段:

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    initAdapter();
    initViewPager();
    initTabLayout();

}

private void initAdapter() {
    titlesList.add(getString(R.string.product_tab_product_search));
    titlesList.add(getString(R.string.product_tab_product_serving));
    pagerAdapter = new ProductPagerAdapter(this);
}

public void initViewPager() {
    mViewPager.setAdapter(pagerAdapter);
    mViewPager.setOffscreenPageLimit(titlesList.size());
}

public void initTabLayout() {
    new TabLayoutMediator(mTabLayout, mViewPager, (tab, position) ->
            tab.setText(titlesList.get(position))).attach();

}

public class ProductPagerAdapter extends FragmentStateAdapter {

    public ProductPagerAdapter(@NonNull FragmentActivity fragmentActivity) {
        super(fragmentActivity);
    }

    public ProductPagerAdapter(@NonNull Fragment fragment) {
        super(fragment);
    }

    public ProductPagerAdapter(@NonNull FragmentManager fragmentManager, @NonNull Lifecycle lifecycle) {
        super(fragmentManager, lifecycle);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {
        switch (position) {
            case TAB_PRODUCT_SEARCH:
                return ProductSearchFragment.newInstance();
            case TAB_PRODUCT_SERVING:
                return ProductServingFragment.newInstance();
            default:
                return ProductSearchFragment.newInstance();
        }
    }

    @Override
    public int getItemCount() {
        return titlesList.size();
    }
}

更新:我的ViewPager2中的每个片段都有recyclerView,这种情况只在recyclerView有项时发生,如果我设置适配器getItemCount返回0,那么指示器工作正常,但是返回1或更多,指示器将被破坏,甚至我的TabLayout不会与ViewPager2连接。

nxowjjhe

nxowjjhe1#

我通过设置TabLayout IndicatorAnimationDuration 0解决了这个问题,但是我不知道问题的确切原因。有人能为我解释一下吗?谢谢。

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