简单新闻客户端(2)---新闻分页界面设计

注意，我们现在的主界面还是空的，不过我们在主界面里留下了一个FrameLayout布局，对于不同的切换就是在Fragment的切换，也就是Fragment的动态添加。

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再看一次原作者的新闻界面:

很容易看出来是Viewpage加上TabLayout的应用，关于这个
我也写过相关文章: android-UI-viewpager–PagerTabStrip的使用—网易云探索(2)
也可以参考文章:ViewPager实现页卡的最新方法–简洁的TabLayout

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Fragment布局文件：

fragment_news:

<?xml version="1.0" encoding="utf-8"?><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.design.widget.TabLayout        android:id="@+id/tab_layout"        android:layout_width="match_parent"        android:layout_height="wrap_content"        app:tabIndicatorColor="@color/colorAccent"        app:tabSelectedTextColor="@color/colorPrimaryDark"        app:tabTextColor="#000"/>    <!--可滑动的布局内容-->    <android.support.v4.view.ViewPager        android:id="@+id/viewpager"        android:layout_width="match_parent"        android:layout_height="wrap_content"/></LinearLayout>

FragmentNews:
注意我们要做一个fragment里面嵌套fragment:先不嵌套

public class NewsFragment extends Fragment {    public static final int NEWS_TYPE_TOP = 0;    public static final int NEWS_TYPE_NBA = 1;    public static final int NEWS_TYPE_CARS = 2;    public static final int NEWS_TYPE_JOKES = 3;    private TabLayout mTablayout;    private ViewPager mViewPager;    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.fragment_news, null);        mTablayout = (TabLayout) view.findViewById(R.id.tab_layout);        mViewPager = (ViewPager) view.findViewById(R.id.viewpager);        mViewPager.setOffscreenPageLimit(3);        setupViewPager(mViewPager);        mTablayout.addTab(mTablayout.newTab().setText(R.string.top));        mTablayout.addTab(mTablayout.newTab().setText(R.string.nba));        mTablayout.addTab(mTablayout.newTab().setText(R.string.cars));        mTablayout.addTab(mTablayout.newTab().setText(R.string.jokes));        mTablayout.setupWithViewPager(mViewPager);        return view;    }    private void setupViewPager(ViewPager mViewPager) {        //Fragment中嵌套使用Fragment一定要使用getChildFragmentManager(),否则会有问题//        MyPagerAdapter adapter = new MyPagerAdapter(getChildFragmentManager());//        adapter.addFragment(NewsListFragment.newInstance(NEWS_TYPE_TOP), getString(R.string.top));//        adapter.addFragment(NewsListFragment.newInstance(NEWS_TYPE_NBA), getString(R.string.nba));//        adapter.addFragment(NewsListFragment.newInstance(NEWS_TYPE_CARS), getString(R.string.cars));//        adapter.addFragment(NewsListFragment.newInstance(NEWS_TYPE_JOKES), getString(R.string.jokes));        //     mViewPager.setAdapter(adapter);    }    public static class MyPagerAdapter extends FragmentPagerAdapter {        private final List<Fragment> mFragments = new ArrayList<>();        private final List<String> mFragmentTitles = new ArrayList<>();        public MyPagerAdapter(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);        }    }}

监听按钮，动态添加fragment:

@Override                    public boolean onNavigationItemSelected(MenuItem menuItem) {                        Toast.makeText(getApplicationContext(),                                menuItem.getTitle(), Toast.LENGTH_LONG).show();                                switch (menuItem.getItemId()){                                    case R.id.navigation_news:                                        getSupportFragmentManager().beginTransaction().replace(R.id.frame_content, new NewsFragment()).commit();                                        mToolbar.setTitle("新闻");                                        break;                                    default:                                        break;                                }                        menuItem.setChecked(true);                        mDrawerLayout.closeDrawers();                        return true;                    }

测试: