Question

我想在我的改编中添加更多Fragment页面，但我不知道该怎么做。这是我的代码adpater与单Fragment，没有问题。提前感谢您的帮助

class TabAdapter(fragmentManager: FragmentManager) : FragmentPagerAdapter(fragmentManager) {

    override fun getItem(position: Int) = SampleFragment() //SampleFragment() is my fragment

    override fun getCount() = 4

    override fun getPageTitle(position: Int) = when (position) {
        0 -> "Music"
        1 -> "Market"
        2 -> "Films"
        else -> "Books"
    }
}

这是我的SampleFragment()

的代码

class SampleFragment : Fragment() {

    override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {
        return inflater!!.inflate(R.layout.fragment_sample, container, false)
    }

}

请帮助我为Fragment

中的每个Pagetitle添加不同的Adapter

Answer 1

以下是如何快速将片段添加到适配器中。

您需要ViewPager来保存您想要显示的所有片段。

首先按如下方式编辑你的xml。

<RelativeLayout
    android:id="@+id/main_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"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    tools:context=".MainActivity">

    <ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/tab_layout" />

    <android.support.design.widget.TabLayout
        android:id="@+id/tab_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?attr/colorPrimary"
        android:elevation="6dp"
        android:minHeight="?attr/actionBarSize"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>

</RelativeLayout>

下一步创建新片段并将其命名为Fragment_one.java。在这里，你可以做任何你喜欢的活动。创建Fragment_two.java或任意多个，并在适配器中实例化它。

接下来创建fragmentAdapter.Java并添加这些代码（这适用于您的自定义适配器）

public class fragmentAdapter extends FragmentStatePagerAdapter {
    int mNumOfTabs;

    public fragmentAdapter(FragmentManager fm, int NumOfTabs){
        super(fm);
        this.mNumOfTabs = NumOfTabs;
    }

    @Override
    public Fragment getItem(int position) {
        // Add as many fragment in this method
        switch (position){
            case 0:
                Fragment_one frag_one = new Fragment_one ();
                return frag_one;
            case 1:
                Fragment_two frag_two = new Fragment_two ();
                return frag_two;
            default:
                return null;
         }

     }

    @Override
    public int getCount() {
         return mNumOfTabs;
     }

}

接下来在onCreate()

中添加MainActivity.java方法

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

//add as many fragments you want to add the "fragment 1" & "fragment 2" is 
//the title for your fragments, it starts for '0','1','2'...
tabLayout.addTab(tabLayout.newTab().setText("fragment 1"));
tabLayout.addTab(tabLayout.newTab().setText("fragment 2"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
final fragmentAdapter adapter = new Adapter(getActivity(),tablayout.geTabCount());
viewPager.setAdapter(adapter);

需要在我的适配器中添加几个片段？

1 个答案: