Android BottomNavigationBar底部导航的使用方法

import android.graphics.Color;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.TypedValue;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.FrameLayout;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;import com.ashokvarma.bottomnavigation.BottomNavigationBar;import com.ashokvarma.bottomnavigation.BottomNavigationItem;import com.ashokvarma.bottomnavigation.ShapeBadgeItem;import com.ashokvarma.bottomnavigation.TextBadgeItem;import java.lang.reflect.Field;public class MainActivity extends AppCompatActivity implements BottomNavigationBar.OnTabSelectedListener { private FragmentManager mFragmentManager; private BottomNavigationBar bottomNavigationBar; private FirstFragment firstFragment; private SecondFragment secondFragment; private ThirdFragment thirdFragment; private FourthFragment fourthFragment; //默认选择第一个fragment private int lastSelectedPosition = 0; private FragmentTransaction transaction; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); bottomNavigationBar = this.findViewById(R.id.bottomNavigationBar); showNumberAndShape(); initNavigation(); } /** * 初始底部导航栏 */ private void initNavigation() { //导航栏Item的个数<=3 用 MODE_FIXED 模式，否则用 MODE_SHIFTING 模式 bottomNavigationBar.setMode(BottomNavigationBar.MODE_FIXED); bottomNavigationBar.setTabSelectedListener(this);//监听切换点击事件 //bottomNavigationBar.setBarBackgroundColor("#595757");//背景颜色 //1、BACKGROUND_STYLE_DEFAULT：如果设置的Mode为MODE_FIXED，将使用BACKGROUND_STYLE_STATIC 。如果Mode为MODE_SHIFTING将使用BACKGROUND_STYLE_RIPPLE。 //2、BACKGROUND_STYLE_STATIC：点击无水波纹效果 //3、BACKGROUND_STYLE_RIPPLE：点击有水波纹效果 bottomNavigationBar.setBackgroundStyle(BottomNavigationBar.BACKGROUND_STYLE_STATIC); //需要添加的item数 bottomNavigationBar  //选中时的图片的资源、文字  .addItem(new BottomNavigationItem(R.drawable.home, "首页")   //选中的颜色   .setActiveColor(R.color.colorAccent)   //选中的颜色(资源文件 下面同上)   //.setActiveColorResource(R.color.colorAccent)   //未选中的颜色(默认灰色 可注释)   .setInActiveColor("#999999")   //未选中时的图片的资源   .setInactiveIconResource(R.drawable.ic_launcher_background))  .addItem(new BottomNavigationItem(R.drawable.home, "订单")   .setActiveColorResource(R.color.colorAccent)   .setInActiveColor("#999999")   .setInactiveIconResource(R.drawable.ic_launcher_background)).  addItem(new BottomNavigationItem(R.drawable.ic_launcher_background, "购物车")   .setActiveColorResource(R.color.colorAccent)   .setInActiveColor("#999999")   .setBadgeItem(textBadgeItem)   .setInactiveIconResource(R.drawable.ic_launcher_background)).  addItem(new BottomNavigationItem(R.drawable.ic_launcher_background, "我的")   .setActiveColorResource(R.color.colorAccent)   .setInActiveColor("#999999")   .setBadgeItem(shapeBadgeItem)   .setInactiveIconResource(R.drawable.ic_launcher_background))  .setFirstSelectedPosition(lastSelectedPosition)//设置默认选中项  //.setFab(FloatingActionButton的id)//FloatingActionButton 关联  .initialise();//注意此句放在最后 setIconItemMargin(bottomNavigationBar,10,25,14); setDefaultFragment(); } /** * 设置默认开启的fragment */ private void setDefaultFragment() { mFragmentManager = getSupportFragmentManager(); FragmentTransaction transaction = mFragmentManager.beginTransaction(); firstFragment = new FirstFragment(); transaction.add(R.id.tb, firstFragment); transaction.commit(); } /** * 切换事件 */ @Override public void onTabSelected(int position) { lastSelectedPosition = position;//每次点击赋值 //开启事务 transaction = mFragmentManager.beginTransaction(); hideFragment(transaction); switch (position) {  case 0:  if (firstFragment == null) {   firstFragment = new FirstFragment();   transaction.add(R.id.tb, firstFragment);  } else {   transaction.show(firstFragment);  }  // transaction.replace(R.id.tb, firstFragment);  break;  case 1:  if (secondFragment == null) {   secondFragment = new SecondFragment();   transaction.add(R.id.tb, secondFragment);  } else {   transaction.show(secondFragment);  }  break;  case 2:  if (thirdFragment == null) {   thirdFragment = new ThirdFragment();   transaction.add(R.id.tb, thirdFragment);  } else {   transaction.show(thirdFragment);  }  break;  case 3:  if (fourthFragment == null) {   fourthFragment = new FourthFragment();   transaction.add(R.id.tb, fourthFragment);  } else {   transaction.show(fourthFragment);  }  break; } // 事务提交 transaction.commit(); } /** * 隐藏当前fragment * * @param transaction */ private void hideFragment(FragmentTransaction transaction) { if (firstFragment != null) {  transaction.hide(firstFragment); } if (secondFragment != null) {  transaction.hide(secondFragment); } if (thirdFragment != null) {  transaction.hide(thirdFragment); } if (fourthFragment != null) {  transaction.hide(fourthFragment); } } private TextBadgeItem textBadgeItem; private ShapeBadgeItem shapeBadgeItem; /** * 展示消息点 */ private void showNumberAndShape() { //消息 textBadgeItem = new TextBadgeItem()  .setText("99")//显示的文本  .setTextColor("#ffffff")//文本颜色  //.setTextColorResource(R.color.colorAccent)//文本颜色(资源文件-下面如同)  .setBorderWidth(6)//圆环宽度  .setBorderColor(Color.parseColor("#000000"))//圆环燕色  //.setBorderColorResource(R.color.colorPrimary)  .setBackgroundColor("#FF4081")//背景颜色  .setHideOnSelect(false);//选中是否隐藏 //.setBackgroundColorResource(R.color.colorAccent)//背景颜色 //.setAnimationDuration(300)//隐藏与动画的过渡时间（setHideOnSelect 为true时生效） //.setGravity(Gravity.RIGHT | Gravity.TOP); //位置，默认右上角(可不设置) //形状 shapeBadgeItem = new ShapeBadgeItem()  //也可设置为常量 （0-6之间）  .setShape(ShapeBadgeItem.SHAPE_HEART) //形状  .setShapeColor(Color.RED) //颜色  //.setShapeColorResource(R.color.colorPrimaryDark) //（同上）  .setEdgeMarginInDp(this, 0) //距离Item的边距，dp值  //.setEdgeMarginInPixels(20) //距离Item的边距，px  .setSizeInDp(this, 15, 15) //宽高值，dp  //.setSizeInPixels(30, 30) //宽高值，px  .setAnimationDuration(300) //隐藏和展示的动画速度，单位毫秒,和setHideOnSelect一起使用  //.setGravity(Gravity.LEFT) //位置，默认右上角  .setHideOnSelect(false); //true：当选中状态时消失，非选中状态显示,moren false } @Override public void onTabUnselected(int position) { } @Override public void onTabReselected(int position) { } /** * 修改间距及图片文字大小 * @param bottomNavigationBar * @param space 文字与图片的间距 * @param imgLen 单位：dp，图片大小 * @param textSize 单位：dp，文字大小 */ private void setIconItemMargin(BottomNavigationBar bottomNavigationBar, int space, int imgLen, int textSize){ Class barClass = bottomNavigationBar.getClass(); Field[] fields = barClass.getDeclaredFields(); for(int i = 0; i < fields.length; i++){  Field field = fields[i];  field.setAccessible(true);  if(field.getName().equals("mTabContainer")){  try{   //反射得到 mTabContainer   LinearLayout mTabContainer = (LinearLayout) field.get(bottomNavigationBar);   for(int j = 0; j < mTabContainer.getChildCount(); j++){   //获取到容器内的各个Tab   View view = mTabContainer.getChildAt(j);   //获取到Tab内的各个显示控件   FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, dip2px(56));   FrameLayout container = (FrameLayout) view.findViewById(R.id.fixed_bottom_navigation_container);   container.setLayoutParams(params);   container.setPadding(dip2px(12), dip2px(0), dip2px(12), dip2px(0));   //获取到Tab内的文字控件   TextView labelView = (TextView) view.findViewById(com.ashokvarma.bottomnavigation.R.id.fixed_bottom_navigation_title);   //计算文字的高度DP值并设置，setTextSize为设置文字正方形的对角线长度，所以：文字高度（总内容高度减去间距和图片高度）*根号2即为对角线长度，此处用DP值，设置该值即可。   labelView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, textSize);   labelView.setIncludeFontPadding(false);   labelView.setPadding(0,0,0,dip2px(20-textSize - space/2));   //获取到Tab内的图像控件   ImageView iconView = (ImageView) view.findViewById(com.ashokvarma.bottomnavigation.R.id.fixed_bottom_navigation_icon);   //设置图片参数，其中，MethodUtils.dip2px()：换算dp值   params = new FrameLayout.LayoutParams(dip2px(imgLen), dip2px(imgLen));   params.setMargins(0,0,0,space/2);   params.gravity = Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL;   iconView.setLayoutParams(params);   }  } catch (IllegalAccessException e){   e.printStackTrace();  }  } } } private int dip2px(float dpValue) { final float scale = getApplication().getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); }}

import android.os.Bundle;import android.support.annotation.NonNull;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public class FirstFragment extends Fragment { @Override public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.activity_first_fragment, container, false); return view; }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="第一个Fragment" android:textSize="30sp" /></LinearLayout>

 switch (position) {  case 0:  firstFragment = new FirstFragment();  transaction.replace(R.id.tb, firstFragment);  break;  case 1:  secondFragment = new SecondFragment();  transaction.replace(R.id.tb, secondFragment);  break;  case 2:  thirdFragment = new ThirdFragment();  transaction.replace(R.id.tb, thirdFragment);  break;  case 3:  fourthFragment = new FourthFragment();  transaction.replace(R.id.tb, fourthFragment);  break; }