Android studio实现底部导航,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

android:id="@+id/bb_menu_recents"

android:icon="@drawable/ic_recents"

android:title="Recents" />

android:id="@+id/bb_menu_favorites"

android:icon="@drawable/ic_favorites"

android:title="Favorites" />

android:id="@+id/bb_menu_nearby"

android:icon="@drawable/ic_nearby"

android:title="Nearby" />

android:id="@+id/bb_menu_friends"

android:icon="@drawable/ic_friends"

android:title="Friends" />

android:id="@+id/bb_menu_food"

android:icon="@drawable/ic_restaurants"

android:title="Food" />

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

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:id="@+id/viewPager"

android:layout_width="match_parent"

android:layout_height="match_parent"/>

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

android:id="@+id/myScrollView"

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

>

android:layout_width="match_parent"

android:layout_height="match_parent"

android:padding="20dp">

android:layout_centerInParent="true"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="@string/baiduInfo"/>

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