需要在片段上显示Android Studio Custom Listview

Question

目前我正在尝试为我的应用程序创建一个自定义列表视图，我已经成功了。但我遇到的问题是，如果我将列表视图放在我的主活动上，那么列表视图将按计划显示文本和图像。但是使用我的应用程序，我可以在页面之间滑动，而不是在我的主活动页面上永久保存此列表视图，我希望它在片段页面上，例如WineList页面，当用户滑动到下一页时，您可以更长时间地看到它

如果我尝试将列表视图更改为片段页面上的视图，那么我会得到一个空的异常错误，这是可以理解的，因为我猜测在用户滑过之前页面尚未生成。

我已将下面的图片包含在内，以证明我的意思。

Listview on Main Activity

我的应用程序设置

自定义适配器类 -

class CustomAdapter extends ArrayAdapter<String> {


public CustomAdapter(Context context, String[] names) {
    super(context, R.layout.custom_row, names);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    LayoutInflater hadleighsInflater = LayoutInflater.from(getContext());
    View customView = hadleighsInflater.inflate(R.layout.custom_row, parent, false);

    String singleName = getItem(position);
    TextView hadleighText = (TextView) customView.findViewById(R.id.hadleighText);
    ImageView hadleighImage = (ImageView) customView.findViewById(R.id.myimageView);

    hadleighText.setText(singleName);
    hadleighImage.setImageResource(R.drawable.imageresize);
    return  customView;




}
}

主要活动 -

   protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.mainwindow);





    viewPager = (ViewPager)findViewById(R.id.swipeView);
    viewPager.setAdapter(new CustomAdapter(getSupportFragmentManager(), getApplicationContext()));

  //  Currently set up to the list view on the main activity


    String[] names = {"Hadleigh", "james", "LOLLLO"};
    ListAdapter hadleighsAdapter = new socialdeveloper.adgestonevineyard.CustomAdapter(this,names);
    ListView hadleighsListView = (ListView)findViewById(R.id.myListview);
    hadleighsListView.setAdapter(hadleighsAdapter);


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

    tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            viewPager.setCurrentItem(tab.getPosition());

        }

WineList片段（我希望在其上显示我的列表视图）-----

public class WineList extends Fragment{




@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    return inflater.inflate(R.layout.winelist, container, false);


}



}

所以基本上它当前在主要活动上，但我不知道我必须实现哪些更改才能在片段页面上显示它。

Example of what I'm trying to achieve

Answer 1

如果您想在(define (replace-after a x y l) (cond ((< (length l) 2) l) ((and (equal? (car l) a) (equal? (cadr l) x)) (cons (car l) (cons y (replace-after a x y (cddr l))))) (else (cons (car l) (replace-after a x y (cdr l)))))) 中显示Fragment - 请使用FragmentStatePagerAdapter。
为ViewPager创建ListView版面。
使用一些参数为Fragment的新实例创建静态方法。使用此参数，您可以在当前Fragment中将适配器设置为ListView的不同值。

如果您感到复杂，请按tutorial 只需将Fragment替换为ImageView，然后执行上述想法。

Answer 2

你也可以使用这个完整的代码！它适用于我在示例图像中看到的内容。

首先，将其添加到build.gradle

    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.android.support:design:23.1.1'
    compile 'com.android.support:support-annotations:23.1.1'

<强> WineListActivity

    //imports
    import android.os.Bundle;
    import android.support.design.widget.TabLayout;
    import android.support.v4.app.Fragment;
    import android.support.v4.app.FragmentManager;
    import android.support.v4.app.FragmentPagerAdapter;
    import android.support.v4.view.ViewPager;
    import android.support.v7.app.AppCompatActivity;
    import java.util.ArrayList;
    import java.util.List;


    public class WineListActivity extends AppCompatActivity {

        ViewPager viewPager;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_winelist);

            viewPager = (ViewPager) findViewById(R.id.viewpager);
            if (viewPager != null) {
                setupViewPager(viewPager);
                viewPager.setOffscreenPageLimit(3);
            }

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


        }


        private void setupViewPager(ViewPager viewPager) {
            Adapter adapter = new Adapter(getSupportFragmentManager());
            adapter.addFragment(new InformationFragment(), "INFORMATION");
            adapter.addFragment(new HomeWebsitesFragment(), "LISTVIEW");
            adapter.addFragment(new HomeFragment(), "HOME");
            viewPager.setAdapter(adapter);
        }


        static class Adapter extends FragmentPagerAdapter {
            private final List<Fragment> mFragments = new ArrayList<>();
            private final List<String> mFragmentTitles = new ArrayList<>();

            public Adapter(FragmentManager fm) {
                super(fm);
            }

            public void addFragment(Fragment fragment, String title) {
                mFragments.add(fragment);
                mFragmentTitles.add(title);
            }

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

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

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

Xml布局， activity_winelist

    <LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#bdc3c7"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />


</LinearLayout>

您的列表片段， ListFragment

public class ListFragment extends Fragment {

    public static final String ARG_PAGE = "ARG_PAGE";
    private int mPage;

    public static ListFragment newInstance(int page) {
        Bundle args = new Bundle();
        args.putInt(ARG_PAGE, page);
        ListFragment fragment = new ListFragment();
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        ListView listview = (ListView) findViewById(R.id.listview);
        String[] values = new String[] { "wine 1", "wine 2", "wine 3",
               "wine 4" };

        ArrayList<String> list = new ArrayList<String>();
       for (int i = 0; i < values.length; ++i) {
           list.add(values[i]);
       }

        MySimpleArrayAdapter adapter = new MySimpleArrayAdapter(this, list);
        if(list.size() == 0){
            listview.setEmptyView(findViewById(R.id.emptyview));
        }
        listview.setAdapter(adapter);
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_list, container, false);
        return view;
    }

}

您的列表list.xml

 <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="?android:attr/listPreferredItemHeight"
        android:padding="6dip" >

        <TextView
            android:id="@+id/label"
            android:layout_width="fill_parent"
            android:layout_height="26dip"
            android:ellipsize="marquee"
            android:singleLine="true"
            android:text="Description"
            android:textSize="12sp" />


    </RelativeLayout>

您的适配器 MySimpleArrayAdapter

    public class MySimpleArrayAdapter extends ArrayAdapter<String> {

        private final Context context;
        private final List<String> values;


            public MySimpleArrayAdapter(Context context, List<String> values) {
                super(context, -1, values);
                this.context = context;
                this.values = values;
            }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View rowView = inflater.inflate(R.layout.list, parent, false);
            TextView textView = (TextView) rowView.findViewById(R.id.label);
            textView.setText(values.get(position));

            return rowView;
        }

    }

然后你可以添加另外两个片段并随心所欲地做它们。

<强> HomeFragment

    public class HomeFragment extends Fragment {

        public static final String ARG_PAGE = "ARG_PAGE";
        private int mPage;

        public static HomeFragment newInstance(int page) {
            Bundle args = new Bundle();
            args.putInt(ARG_PAGE, page);
            HomeFragment fragment = new HomeFragment();
            fragment.setArguments(args);
            return fragment;
        }

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            //mPage = getArguments().getInt(ARG_PAGE);
        }


        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {

            View view = inflater.inflate(R.layout.fragment_home, container, false);
            return view;
        }

    }

<强> InformationFragment

    public class InformationFragment extends Fragment {

        public static final String ARG_PAGE = "ARG_PAGE";
        private int mPage;

        public static InformationFragment newInstance(int page) {
            Bundle args = new Bundle();
            args.putInt(ARG_PAGE, page);
            InformationFragment fragment = new InformationFragment();
            fragment.setArguments(args);
            return fragment;
        }

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            //mPage = getArguments().getInt(ARG_PAGE);
        }


        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {

            View view = inflater.inflate(R.layout.fragment_information, container, false);
            return view;
        }

    }