Question

我已经使用ViewPayer创建了TabLayout，就像这样

<?xml version="1.0" encoding="utf-8"?>
<layout 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">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <include
        android:id="@+id/layout"
        layout="@layout/common_act" />


    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/white"
        app:tabGravity="fill"
        app:tabIndicatorHeight="4dp"
        app:tabMode="fixed"
        app:tabSelectedTextColor="@color/colorAccent" />


    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</LinearLayout>

然后我创建了两个片段。

显示TabLayout 我已经为我的TabLayout活动创建了类似下面的代码

public class ManageWorkShopActivity extends BaseActivity {

    private ManageWorkShopActBinding mBinding;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mBinding = DataBindingUtil.setContentView(this, R.layout.manage_work_shop_act);


        mBinding.layout.title.setText("Manage Workshop");

        setupViewPager(mBinding.viewpager);
        mBinding.tabs.setupWithViewPager(mBinding.viewpager);

        mBinding.layout.nav.setVisibility(View.VISIBLE);
        mBinding.layout.nav.setOnClickListener(view -> onBackPressed());

    }

    private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFragment(new ViewProfileFragment(), "Fragment1");
        adapter.addFragment(new ViewPerformanceFragment(), "Fragment2");
        viewPager.setAdapter(adapter);
    }

}

然后我为以下代码创建了适配器。

public class ViewPagerAdapter extends FragmentPagerAdapter {

    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

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

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }
}

然后如果我运行应用程序，它将显示Fragment1作为默认选择的屏幕。

另一方面，我有一个按钮来导航这个TabLayout活动，如果我点击那个按钮，那么我应该能够将Fragment2作为选定的屏幕。所以任何人都可以建议解决方案

提前致谢。

Answer 1

您可以使用viewpager.setCurrentItem(int index)

例如，你有一个Button btnToNextFragment;：

btnToNextFragment.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                yourViewPager.setCurrentItem(int indexOfYourFragment2)
            }
        });

Answer 2

当点击事件发生时，只有pager的setCurrentItem

 nxt.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mPager.setCurrentItem(mPager.getCurrentItem() + 1);
        }
    });

当我从TabLayout中的其他一些活动中单击按钮时，如何转到第二个片段

2 个答案: