Question

当我向左或向右滑动选项卡时，下一个选项卡会膨胀 - 片段显示正确 - 但是，当我单击选项卡标题时，没有任何反应。这是否必须手动实施？我默认不了解滑动工作，所以也应点击。

我的XML

    <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorPrimary"
            android:layout_below="@+id/toolbar"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true" />

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

主要活动

     ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    viewPager.setAdapter(adapter);

    tabLayout.setupWithViewPager(viewPager);
    viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));

Answer 1

这样做：

 public class MainActivity extends AppCompatActivity {

private final int numOfPages = 4; //viewpager has 4 pages
private final String[] pageTitle = {"Food", "Movie", "Shopping", "Travel"};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);

    for (int i = 0; i < numOfPages; i++) {
        tabLayout.addTab(tabLayout.newTab().setText(pageTitle[i]));
    }

    //set gravity for tab bar
    tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

    final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
    final PagerAdapter adapter = new PagerAdapter
            (getSupportFragmentManager(), numOfPages);

    viewPager.setAdapter(adapter);
    viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
    tabLayout.setOnTabSelectedListener(onTabSelectedListener(viewPager));
}

private TabLayout.OnTabSelectedListener onTabSelectedListener(final ViewPager pager) {
    return new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            pager.setCurrentItem(tab.getPosition());
        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {

        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {

        }
    };
}

Answer 2

以下代码适用于我:)

tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(viewPager));

Answer 3

我在更新我们的应用程序以在4.4设备上运行时遇到了这个问题。通过调用

解决

tabLayout.bringToFront()

Android TabLayout在点击时不会更改Tab（片段）仅在刷卡时有效

3 个答案: