BottomBar
BottomBar是Github上的一个开源框架，因为从1.3.3开始不支持fragments了，要自己配置，弄了很久，不管是app的fragment还是V4 的程序总是总是闪退。于是就用这种方式实现了，效果还不错。github有详细说明，多余的就不说了。
这个roughike是这个项目的所有者（大神致敬）。
我用的是Android studio开发，fragment全部导的V4的包（以为最开始就支持的是v4的，后面也支持了app.fragment）.
首先是dependencies
compile 'com.jakewharton:butterknife:7.0.0'
compile 'com.roughike:bottom-bar:1.3.3'
添加第二个就行了，我这用到了butterknife（不知道的可以百度，出自jakewharton大神的一款View注入框架）。
从menu添加items
res/menu/bottombar_menu.xml
<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/bb_menu_recents" android:icon="@drawable/ic_recents" android:title="Recents" /> <item android:id="@+id/bb_menu_favorites" android:icon="@drawable/ic_favorites" android:title="Favorites" /> <item android:id="@+id/bb_menu_nearby" android:icon="@drawable/ic_nearby" android:title="Nearby" /> <item android:id="@+id/bb_menu_friends" android:icon="@drawable/ic_friends" android:title="Friends" /> <item android:id="@+id/bb_menu_food" android:icon="@drawable/ic_restaurants" android:title="Food" /> </menu>
在activity中初始化BottomBar和ViewPager
public class MainActivity extends FragmentActivity { @Bind(R.id.viewPager) ViewPager viewPager; @Bind(R.id.myCoordinator) CoordinatorLayout myCoordinator; private BottomBar mBottomBar; private List<Fragment> fragmentList; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ButterKnife.bind(this); initViewPager(); createBottomBar(savedInstanceState); } private void createBottomBar(Bundle savedInstanceState) { mBottomBar = BottomBar.attachShy(myCoordinator,viewPager, savedInstanceState); mBottomBar.setItemsFromMenu(R.menu.bottombar_menu, new OnMenuTabClickListener() { @Override public void onMenuTabSelected(@IdRes int menuItemId) { switch (menuItemId) { case R.id.bb_menu_recents: viewPager.setCurrentItem(0); break; case R.id.bb_menu_favorites: viewPager.setCurrentItem(1); break; case R.id.bb_menu_nearby: break; case R.id.bb_menu_friends: break; case R.id.bb_menu_food: break; } } @Override public void onMenuTabReSelected(@IdRes int menuItemId) { } }); // Setting colors for different tabs when there's more than three of them. // You can set colors for tabs in three different ways as shown below. mBottomBar.mapColorForTab(0, ContextCompat.getColor(this, R.color.colorAccent)); mBottomBar.mapColorForTab(1, 0xFF5D4037); mBottomBar.mapColorForTab(2, "#7B1FA2"); mBottomBar.mapColorForTab(3, "#FF5252"); mBottomBar.mapColorForTab(4, "#FF9800"); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); // Necessary to restore the BottomBar's state, otherwise we would // lose the current tab on orientation change. mBottomBar.onSaveInstanceState(outState); } private void initViewPager() { fragmentList = new ArrayList<>(); fragmentList.add(new FragmentOne()); fragmentList.add(new FragmentTwo()); viewPager.setAdapter(new FragmentStatePagerAdapter(getSupportFragmentManager()) { @Override public Fragment getItem(int position) { return fragmentList.get(position); } @Override public int getCount() { return fragmentList.size(); } }); viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { mBottomBar.selectTabAtPosition(position, true); } @Override public void onPageScrollStateChanged(int state) { } }); } }
BottomBar的github上提供了两种初始化方式，这里是第二种实现下滑隐藏，因为是fragment滚动所以fragment的布局要被NestedScrollView包裹（下面贴代码，很简单的），同时注意viewPager.setOnPageChangeListener已经过时了。
layout/activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/myCoordinator" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" tools:context="com.example.bottombar.bottombar.MainActivity"> <android.support.v4.view.ViewPager android:id="@+id/viewPager" android:layout_width="match_parent" android:layout_height="match_parent"/> </android.support.design.widget.CoordinatorLayout>
FragmentOne.Java
public class FragmentOne extends Fragment { View v; Context context; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { v = inflater.inflate(R.layout.fragment_one, container,false); context = getActivity(); return v; } }
layout/fragment_one.xml
<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.NestedScrollView android:id="@+id/myScrollView" xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:padding="20dp"> <TextView android:layout_centerInParent="true" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/baiduInfo"/> </RelativeLayout> </android.support.v4.widget.NestedScrollView>
以上所述是小编给大家介绍的Android 开发之BottomBar+ViewPager+Fragment实现炫酷的底部导航效果的相关知识，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！