Android 开发之BottomBar+ViewPager+Fragment实现炫酷的底部导航效果

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

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 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

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

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