Android BottomNavigationBar底部导航控制器使用方法详解

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) {
      }
    });

3.案例的实现

布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://www.easck.com/apk/res/android"
  xmlns:tools="http://www.easck.com/tools"
  xmlns:app="http://www.easck.com/apk/res-auto" android:layout_width="match_parent"
  android:layout_height="match_parent"
  app:layout_behavior="@string/appbar_scrolling_view_behavior"
  tools:showIn="@layout/activity_navigation_view_demo"
  tools:context="com.lidong.demo.navigation_view.BottomNavigationBarDemoActivity">

  <LinearLayout
    android:id="@+id/tb"
    android:layout_width="match_parent"
     android:layout_height="match_parent"
    android:orientation="vertical" />
  <com.ashokvarma.bottomnavigation.BottomNavigationBar
    android:id="@+id/bottom_navigation_bar"
    android:layout_width="match_parent"
    android:layout_alignParentBottom="true"
    android:layout_height="wrap_content"/>
</RelativeLayout>

Activity的代码：

package com.lidong.demo.navigation_view;

import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;

import com.ashokvarma.bottomnavigation.BottomNavigationBar;
import com.ashokvarma.bottomnavigation.BottomNavigationItem;
import com.lidong.demo.R;

/**
 * BottomNavigationBar实现
 */
public class BottomNavigationBarDemoActivity extends AppCompatActivity implements BottomNavigationBar.OnTabSelectedListener {

  private BottomNavigationBar bottomNavigationBar;
  int lastSelectedPosition = 0;
  private String TAG = BottomNavigationBarDemoActivity.class.getSimpleName();
  private LocationFragment mLocationFragment;
  private FindFragment mFindFragment;
  private FavoritesFragment mFavoritesFragment;
  private BookFragment mBookFragment;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_navigation_view_demo);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_navigation_bar);

    bottomNavigationBar
        .addItem(new BottomNavigationItem(R.mipmap.ic_location_on_white_24dp, "位置").setActiveColor(R.color.orange))
        .addItem(new BottomNavigationItem(R.mipmap.ic_find_replace_white_24dp, "发现").setActiveColor(R.color.blue))
        .addItem(new BottomNavigationItem(R.mipmap.ic_favorite_white_24dp, "爱好").setActiveColor(R.color.green))
        .addItem(new BottomNavigationItem(R.mipmap.ic_book_white_24dp, "图书").setActiveColor(R.color.blue))
        .setFirstSelectedPosition(lastSelectedPosition )
        .initialise();

    bottomNavigationBar.setTabSelectedListener(this);
    setDefaultFragment();
  }

  /**
   * 设置默认的
   */
  private void setDefaultFragment() {
    FragmentManager fm = getFragmentManager();
    FragmentTransaction transaction = fm.beginTransaction();
    mLocationFragment = LocationFragment.newInstance("位置");
    transaction.replace(R.id.tabs, mLocationFragment);
    transaction.commit();
  }

  @Override
  public void onTabSelected(int position) {
    Log.d(TAG, "onTabSelected() called with: " + "position = [" + position + "]");
    FragmentManager fm = this.getFragmentManager();
    //开启事务
    FragmentTransaction transaction = fm.beginTransaction();
    switch (position) {
      case 0:
        if (mLocationFragment == null) {
          mLocationFragment = LocationFragment.newInstance("位置");
        }
        transaction.replace(R.id.tb, mLocationFragment);
        break;
      case 1:
        if (mFindFragment == null) {
          mFindFragment = FindFragment.newInstance("发现");
        }
        transaction.replace(R.id.tb, mFindFragment);
        break;
      case 2:
        if (mFavoritesFragment == null) {
          mFavoritesFragment = FavoritesFragment.newInstance("爱好");
        }
        transaction.replace(R.id.tb, mFavoritesFragment);
        break;
      case 3:
        if (mBookFragment == null) {
          mBookFragment = BookFragment.newInstance("图书");
        }
        transaction.replace(R.id.tb, mBookFragment);
        break;
      default:
        break;
    }
    // 事务提交
    transaction.commit();
  }

  @Override
  public void onTabUnselected(int position) {
    Log.d(TAG, "onTabUnselected() called with: " + "position = [" + position + "]");
  }

  @Override
  public void onTabReselected(int position) {

  }
}
								 
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