使用 Android TabLayout 时单击选项卡不会切换当前选项卡

我应该自己设置 onClicks 吗？如果是的话，我应该在哪里设置？

<RelativeLayout
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" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

<android.support.design.widget.TabLayout
    android:id="@+id/sliding_tabs"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:tabMode="scrollable" />

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

主要问题是，ViewPager覆盖了TabLayout。所以，你应该把它放在下面TabLayout:

<androidx.viewpager.widget.ViewPager
    android:id="@+id/viewpager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/sliding_tabs"/>

并从 Activity 的 onCreate 方法中调用：

TabLayout tabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
tabLayout.setupWithViewPager(viewPager);

有关更多详细信息，请查看此示例：

https://github.com/chrisbanes/cheesesquare/blob/master/app/src/main/java/com/support/android/designlibdemo/MainActivity.java https://github.com/chrisbanes/cheesesquare/blob/master/app/src/main/java/com/support/android/designlibdemo/MainActivity.java

https://github.com/chrisbanes/cheesesquare/blob/master/app/src/main/res/layout/include_list_viewpager.xml https://github.com/chrisbanes/cheesesquare/blob/master/app/src/main/res/layout/include_list_viewpager.xml