Android--------TabLayout实现新闻客户端顶部导航栏
APP市场中大多数新闻App都有导航菜单,导航菜单是一组标签的集合,在新闻客户端中,每个标签标示一个新闻类别,对应下面ViewPager控件的一个分页面,今日头条, 网易新闻等。
随着版本迭代的更新,带来了许多控件,案例主要用到了TabLayout,ViewPage,RecyclerView,CardView等新控件。 效果如图:
以前的实现方法是 :ViewPagerIndicator + Fragment + ViewPager 相结合来实现
请看博客: ViewPagerIndicator实现新闻App导航栏。
今天主要讲的是另一种实现方式:TabLayout+ Fragment + ViewPager
添加程序所需要的依赖:
compile 'com.android.support:design:23.2.1' compile 'com.android.support:recyclerview-v7:23.1.1' compile 'com.android.support:cardview-v7:23.2.1'
主布局
<?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/tablayout" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#E0E0E0" app:tabIndicatorColor="@color/ind_red" app:tabMode="fixed" app:tabSelectedTextColor="@color/material_orange" app:tabTextColor="@android:color/black" app:tabIndicatorHeight="5dp" app:tabTextAppearance="@style/TabStyle" /> <android.support.v4.view.ViewPager android:id="@+id/tab_viewpager" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:background="@android:color/white" /> </LinearLayout>
Tablayout控件包含很多属性 例如 tabIndicatorColor:菜单下方移动的横线的颜色 属性很多就不一 一介绍了,代码中有注释。
Activity.Java
public class TabLessActivity extends AppCompatActivity { private TabLayout tabLayout = null; private ViewPager viewPager; private Fragment[] mFragmentArrays = new Fragment[5]; private String[] mTabTitles = new String[5]; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); supportRequestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.tab_layout); tabLayout = (TabLayout) findViewById(R.id.tablayout); viewPager = (ViewPager) findViewById(R.id.tab_viewpager); initView(); } private void initView() { mTabTitles[0] = "推荐"; mTabTitles[1] = "热点"; mTabTitles[2] = "科技"; mTabTitles[3] = "体育"; mTabTitles[4] = "健康"; tabLayout.setTabMode(TabLayout.MODE_FIXED); //设置tablayout距离上下左右的距离 //tab_title.setPadding(20,20,20,20); mFragmentArrays[0] = TabFragment.newInstance(); mFragmentArrays[1] = TabFragment.newInstance(); mFragmentArrays[2] = TabFragment.newInstance(); mFragmentArrays[3] = TabFragment.newInstance(); mFragmentArrays[4] = TabFragment.newInstance(); PagerAdapter pagerAdapter = new MyViewPagerAdapter(getSupportFragmentManager()); viewPager.setAdapter(pagerAdapter); //将ViewPager和TabLayout绑定 tabLayout.setupWithViewPager(viewPager); } }
Fragment.java
public class TabFragment extends Fragment { public static Fragment newInstance() { TabFragment fragment = new TabFragment(); return fragment; } @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_tab, container, false); RecyclerView recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler); LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity()); layoutManager.setOrientation(LinearLayoutManager.VERTICAL); recyclerView.setLayoutManager(layoutManager); recyclerView.setAdapter(new RecyclerAdapter()); return rootView; } }
技术在更新,我们在进步,TabLayout实现tab导航效果比以前那些方法来的更加简单方便。