Android--BottomNavigationBar实现底部导航栏
版权声明：本文为博主原创文章，转载请标明出处。 https://blog.csdn.net/chaoyu168/article/details/79221230 1.BottomNavigationBar的下载地址 https://github.com/Ashok-Varma/BottomNavigation 2.使用的方法 2.1在Gradle中添加 compile ‘com.ashokvarma.android:bottom-navigation-bar:0.9.5’ 2.2布局实现 <com.ashokvarma.bottomnavigation.BottomNavigationBar android:layout_gravity="bottom" android:id="@+id/bottom_navigation_bar" android:layout_width="match_parent" android:layout_height="wrap_content"/> 1 2 3 4 5 2.3类中Activity中添加BottomNavigationItem BottomNavigationBar bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_navigation_bar); bottomNavigationBar .addItem(new BottomNavigationItem(R.drawable.ic_home_white_24dp, "Home")) .addItem(new BottomNavigationItem(R.drawable.ic_book_white_24dp, "Books")) .addItem(new BottomNavigationItem(R.drawable.ic_music_note_white_24dp, "Music")) .addItem(new BottomNavigationItem(R.drawable.ic_tv_white_24dp, "Movies & TV")) .addItem(new BottomNavigationItem(R.drawable.ic_videogame_asset_white_24dp, "Games")) .initialise(); 1 2 3 4 5 6 7 8 9 2.4设置事件监听器TabChangeListener bottomNavigationBar.setTabSelectedListener(new BottomNavigationBar.OnTabSelectedListener(){ @Override public void onTabSelected(int position) { } @Override public void onTabUnselected(int position) {] } @Override public void onTabReselected(int position) { } }); 1 2 3 4 5 6 7 8 9 10 11 3.展示 MODE_FIXED+BACKGROUND_STYLE_STATIC效果 DE_FIXED+BACKGROUND_STYLE_RIPPLE效果 MODE_SHIFTING+BACKGROUND_STYLE_STATIC效果 MODE_SHIFTING+BACKGROUND_STYLE_RIPPLE效果 4.代码实现 package com.android.xiaobai; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.support.v7.app.AppCompatActivity; import android.util.Log; import com.ashokvarma.bottomnavigation.BottomNavigationBar; import com.ashokvarma.bottomnavigation.BottomNavigationItem; import java.util.ArrayList; import fragment.ContactsFragment; import fragment.DongtaiFragment; import fragment.MsgFragment; /** * Created by xiaobai on 2018/1/31/031. */ public class MessageActivity extends AppCompatActivity implements BottomNavigationBar.OnTabSelectedListener { private ArrayList<Fragment> fragments; private BottomNavigationBar bottomNavigationBar; private MsgFragment msgFragment; private ContactsFragment contactsFragment; private DongtaiFragment dongtaiFragment; private FragmentManager fragmentManager; private FragmentTransaction transaction; int lastSelectedPosition = 0; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activty_message); bottomNavigationBar = findViewById(R.id.bottom_navigation_bar); init(); } private void init() { //要先设计模式后再添加图标！ //设置按钮模式 MODE_FIXED表示固定 MODE_SHIFTING表示转移 bottomNavigationBar.setMode(BottomNavigationBar.MODE_FIXED); //设置背景风格 // BACKGROUND_STYLE_STATIC表示静态的 //BACKGROUND_STYLE_RIPPLE表示涟漪的，也就是可以变化的 ，跟随setActiveColor里面的颜色变化 bottomNavigationBar.setBackgroundStyle(BottomNavigationBar.BACKGROUND_STYLE_RIPPLE); //添加并设置图标、图标的颜色和文字 bottomNavigationBar .addItem(new BottomNavigationItem(R.drawable.im_botton_message, "消息")).setActiveColor(R.color.blue) .addItem(new BottomNavigationItem(R.drawable.im_botton_contacts, "联系人")).setActiveColor(R.color.red) .addItem(new BottomNavigationItem(R.drawable.im_botton_dongtai, "动态")).setActiveColor(R.color.orign) .setFirstSelectedPosition(lastSelectedPosition ) .initialise(); bottomNavigationBar.setTabSelectedListener(this); setDefaultFragment(); } //设置初始界面 private void setDefaultFragment() { fragmentManager = getSupportFragmentManager(); transaction = fragmentManager.beginTransaction(); transaction.replace(R.id.layFrame, MsgFragment.newInstance("消息")); transaction.commit(); } @Override public void onTabSelected(int position) { fragmentManager = getSupportFragmentManager(); transaction = fragmentManager.beginTransaction(); switch (position) { case 0: if (msgFragment == null) { msgFragment = MsgFragment.newInstance("消息"); } transaction.replace(R.id.layFrame, msgFragment); break; case 1: if (contactsFragment == null) { contactsFragment = ContactsFragment.newInstance("联系人"); } transaction.replace(R.id.layFrame, contactsFragment); break; case 2: if (dongtaiFragment == null) { dongtaiFragment = DongtaiFragment.newInstance("动态"); } transaction.replace(R.id.layFrame, dongtaiFragment); break; default: break; } // 事务提交 transaction.commit(); } @Override public void onTabUnselected(int position) { Log.d("dongtaiFragment", "onTabUnselected() called with: " + "position = [" + position + "]"); } @Override public void onTabReselected(int position) { } } package fragment; import android.os.Bundle; import android.support.annotation.Nullable; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import com.android.xiaobai.R; /** * Created by xiaobai on 2018/1/31/031. */ public class MsgFragment extends BaseFragment { /** * 标志位，标志已经初始化完成 */ private boolean isPrepared; /** * 是否已被加载过一次，第二次就不再去请求数据了 */ private boolean mHasLoadedOnce; TextView textView; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { if (mView == null) { // 需要inflate一个布局文件 填充Fragment mView = inflater.inflate(R.layout.fragment_msg, container, false); initView(); isPrepared = true; // 实现懒加载 lazyLoad(); } //缓存的mView需要判断是否已经被加过parent， 如果有parent需要从parent删除，要不然会发生这个mView已经有parent的错误。 ViewGroup parent = (ViewGroup) mView.getParent(); if (parent != null) { parent.removeView(mView); } return mView; } /** * 初始化控件 */ private void initView() { } @Override public void lazyLoad() { if (!isPrepared || !isVisible || mHasLoadedOnce) { return; } //填充各控件的数据 mHasLoadedOnce = true; } public static MsgFragment newInstance(String param1) { MsgFragment fragment = new MsgFragment(); Bundle args = new Bundle(); args.putString("agrs1", param1); fragment.setArguments(args); return fragment; } } <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MessageActivity"> <FrameLayout android:id="@+id/layFrame" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" /> <com.ashokvarma.bottomnavigation.BottomNavigationBar android:id="@+id/bottom_navigation_bar" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="bottom" /> </LinearLayout> package fragment; import android.support.v4.app.Fragment; import android.view.View; /** * Created by xiaobai on 2018/1/31/031. */ public abstract class BaseFragment extends Fragment { /** * Fragment当前状态是否可见 */ public boolean isVisible; /** * inflate布局文件 返回的view */ public View mView; /** * 简化 findViewById * * @param viewId * @param <T> * @return */ protected <T extends View> T find(int viewId) { return (T) mView.findViewById(viewId); } /** * setUserVisibleHint是在onCreateView之前调用的 * 设置Fragment可见状态 */ @Override public void setUserVisibleHint(boolean isVisibleToUser) { super.setUserVisibleHint(isVisibleToUser); /** * 判断是否可见 */ if (getUserVisibleHint()) { isVisible = true; onVisible(); } else { isVisible = false; onInvisible(); } } /** * 可见 */ private void onVisible() { lazyLoad(); } /** * 不可见 */ private void onInvisible() { } /** * 延迟加载 * 子类必须重写此方法 */ public abstract void lazyLoad(); } BottomNavigationBar 图标和文字的间距： 在自己项目里value文件夹中的dimens.xml里面复写fixed_height_bottom_padding（默认是10dp，值越小，间距越大。适合的模式是BottomNavigationBar.MODE_FIXED） 如果模式是BottomNavigationBar.MODE_SHIFTING也是一样，复写和修改相关的参数
