如何在Android轻扫选项卡中使用ListFragment？

概述我以前使用过这段代码来获得两个布局的滑动选项卡视图,它可以正常工作.publicclassMainActivityextendsFragmentActivity{/***The{@linkandroid.support.v4.view.PagerAdapter}thatwillprovide*fragmentsforeachofthesections.Weusea*{@linkandroid

我以前使用过这段代码来获得两个布局的滑动选项卡视图,它可以正常工作.

public class MainActivity extends FragmentActivity {/** * The {@link androID.support.v4.vIEw.PagerAdapter} that will provIDe * fragments for each of the sections. We use a * {@link androID.support.v4.app.FragmentPagerAdapter} derivative, which * will keep every loaded fragment in memory. If this becomes too memory * intensive, it may be best to switch to a * {@link androID.support.v4.app.FragmentStatePagerAdapter}. */SectionsPagerAdapter mSectionsPagerAdapter;/** * The {@link VIEwPager} that will host the section contents. */VIEwPager mVIEwPager;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    // Create the adapter that will return a fragment for each of the three    // primary sections of the app.    mSectionsPagerAdapter = new SectionsPagerAdapter(            getSupportFragmentManager());    // Set up the VIEwPager with the sections adapter.    mVIEwPager = (VIEwPager) findVIEwByID(R.ID.pager);    mVIEwPager.setAdapter(mSectionsPagerAdapter);}@OverrIDepublic boolean onCreateOptionsMenu(Menu menu) {    // Inflate the menu; this adds items to the action bar if it is present.    getMenuInflater().inflate(R.menu.main, menu);    return true;}/** * A {@link FragmentPagerAdapter} that returns a fragment corresponding to * one of the sections/tabs/pages. */public class SectionsPagerAdapter extends FragmentPagerAdapter {    public SectionsPagerAdapter(FragmentManager fm) {        super(fm);    }    @OverrIDe    public Fragment getItem(int position) {        // getItem is called to instantiate the fragment for the given page.        // Return a DummySectionFragment (defined as a static inner class        // below) with the page number as its lone argument.        Fragment fragment = new DummySectionFragment();        Bundle args = new Bundle();        args.putInt(DummySectionFragment.ARG_OBJECT, position);        fragment.setArguments(args);        return fragment;    }    @OverrIDe    public int getCount() {        // Show 2 total pages.        return 2;    }    @OverrIDe    public CharSequence getPageTitle(int position) {        Locale l = Locale.getDefault();        switch (position) {        case 0:            return getString(R.string.Title_section1).toupperCase(l);        case 1:            return getString(R.string.Title_section2).toupperCase(l);        }        return null;    }}/** * A dummy fragment representing a section of the app, but that simply * displays dummy text. */public static class DummySectionFragment extends Fragment {    /**     * The fragment argument representing the section number for this     * fragment.     */    public static final String ARG_SECTION_NUMBER = "section_number";    public static final String ARG_OBJECT = "object";    public DummySectionFragment() {    }    @OverrIDe    public VIEw onCreateVIEw(LayoutInflater inflater, VIEwGroup container,            Bundle savedInstanceState) {        Bundle args = getArguments();        int position = args.getInt(ARG_OBJECT);        int tabLayout = 0;        switch (position) {        case 0:        tabLayout = R.layout.tab_new;        break;        case 1:        tabLayout = R.layout.tab_summary;        break;        }        VIEw rootVIEw = inflater.inflate(tabLayout, container, false);        return rootVIEw;    }}public boolean onoptionsItemSelected(MenuItem item) {    switch (item.getItemID()) {    case R.ID.action_settings:        Intent i = new Intent(this, SettingsActivity.class);        startActivity(i);    }    return true;}

}

为此,我只创建了2个xml文件,并在标签正确定位时初始化它们;但是,现在我想要2个选项卡,但第二个必须是列表.我不知道该怎么做.我尝试扩展ListFragment,但它崩溃了找不到的资源.我已经被困了很长时间了,有人请帮忙吗？我搜索了很多并查看了所有示例,但没有一个显示如何在选项卡中创建列表以及如何调用它.

这就是我现在所拥有的
主要活动

public class MainActivity extends FragmentActivity {SimpleListFragment x = new SimpleListFragment();/** * The {@link androID.support.v4.vIEw.PagerAdapter} that will provIDe * fragments for each of the sections. We use a * {@link androID.support.v4.app.FragmentPagerAdapter} derivative, which * will keep every loaded fragment in memory. If this becomes too memory * intensive, it may be best to switch to a * {@link androID.support.v4.app.FragmentStatePagerAdapter}. */SectionsPagerAdapter mSectionsPagerAdapter;/** * The {@link VIEwPager} that will host the section contents. */VIEwPager mVIEwPager;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    // Create the adapter that will return a fragment for each of the three    // primary sections of the app.    mSectionsPagerAdapter = new SectionsPagerAdapter(            getSupportFragmentManager());    // Set up the VIEwPager with the sections adapter.    mVIEwPager = (VIEwPager) findVIEwByID(R.ID.pager);    mVIEwPager.setAdapter(mSectionsPagerAdapter);}@OverrIDepublic boolean onCreateOptionsMenu(Menu menu) {    // Inflate the menu; this adds items to the action bar if it is present.    getMenuInflater().inflate(R.menu.main, menu);    return true;}/** * A {@link FragmentPagerAdapter} that returns a fragment corresponding to * one of the sections/tabs/pages. */public class SectionsPagerAdapter extends FragmentPagerAdapter {    public SectionsPagerAdapter(FragmentManager fm) {        super(fm);    }    @OverrIDe    public Fragment getItem(int position) {        // getItem is called to instantiate the fragment for the given page.        // Return a DummySectionFragment (defined as a static inner class        // below) with the page number as its lone argument.        Fragment fragment = new DummySectionFragment();        Bundle args = new Bundle();        args.putInt(DummySectionFragment.ARG_OBJECT, position + 1);        fragment.setArguments(args);        return fragment;    }    @OverrIDe    public int getCount() {        // Show 3 total pages.        return 2;    }    @OverrIDe    public CharSequence getPageTitle(int position) {        Locale l = Locale.getDefault();        switch (position) {        case 0:            return getString(R.string.Title_section1).toupperCase(l);        case 1:            return getString(R.string.Title_section2).toupperCase(l);        }        return null;    }}/** * A dummy fragment representing a section of the app, but that simply * displays dummy text. */public static class DummySectionFragment extends Fragment {    /**     * The fragment argument representing the section number for this     * fragment.     */    public static final String ARG_SECTION_NUMBER = "section_number";    public static final String ARG_OBJECT = "object";    public DummySectionFragment() {    }    @OverrIDe    public VIEw onCreateVIEw(LayoutInflater inflater, VIEwGroup container,            Bundle savedInstanceState) {        Bundle args = getArguments();        int position = args.getInt(ARG_OBJECT);        int tabLayout = 0;        switch (position) {        case 0:        tabLayout = R.layout.tab_home;        break;        case 1:            SimpleListFragment simpleListFragment = new SimpleListFragment();        break;        }        VIEw rootVIEw = inflater.inflate(tabLayout, container, false);        return rootVIEw;    }}

}

解决方法:

ATM您正在DummySectionFragment中创建ListFragment.那是不对的.

这是一种做法.不是最好的,但有一个很好理解.

在主活动中创建片段并将它们传递给适配器. DummyListFragment是从ListFragment派生的新类.这里重要的是它使用的XML布局包含一个具有ID @androID：ID / List的ListVIEw. (因此片段能够理解它必须/可以使用哪个列表视图.

public class MainActivity extends FragmentActivity {SectionsPagerAdapter mSectionsPagerAdapter;VIEwPager mVIEwPager;List<Fragment> mFragments;@OverrIDe protected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main); mFragments = new ArrayList<Fragment>(); mFragments.add(new DummySectionFragment(); mFragments.add(new DummyListFragment();  mSectionsPagerAdapter = new SectionsPagerAdapter(        getSupportFragmentManager(), mFragments);

…

public class SectionsPagerAdapter extends FragmentPagerAdapter {    List<Fragment> fragmentList;    public SectionsPagerAdapter(FragmentManager fm, List<Fragment> fragments) {        super(fm);        fragmentList = fragments;    }@OverrIDepublic int getCount() {    return fragmentList.size();}    @OverrIDe    public Fragment getItem(int position) {        Fragment fragment = fragmentList.get(position);                return fragment;    }

. .

public static class DummyListFragment extends ListFragment {public DummyListFragment() {}@OverrIDepublic VIEw onCreateVIEw(LayoutInflater inflater, VIEwGroup container,        Bundle savedInstanceState) {    return inflater.inflate(R.layout.my_List_fragment, container, false);}

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