Android BottomNavigationBar底部导航控制器的使用

最近Google在自己推出的Material design中增加了Bottom Navigation导航控制。Android一直没有官方的导航控制器，自己实现确实是五花八门，有了这个规定之后，就类似苹果的底部Toolbar，以后我们的APP就会有一致的风格，先看一张效果：

这是官方在Material design中给出一张图，确实很不错。

https://github.com/Ashok-Varma/BottomNavigation

2.1在Gradle中添加

compile ‘com.ashokvarma.android:bottom-navigation-bar:0.9.5’

2.2布局实现

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()

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) {
            }
        });

布局文件

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 > BottomNavigationBarDemoActivity extends AppCompatActivity implements BottomNavigationBar.OnTabSelectedListener {

    private BottomNavigationBar bottomNavigationBar;
    int lastSelectedPosition = 0;
    private String TAG = BottomNavigationBarDemoActivity.>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();
        
        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;
        }
        
        transaction.commit();
    }

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

    @Override
    public void onTabReselected(int position) {

    }
}

fragment的代码

package com.lidong.demo.navigation_view;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.lidong.demo.R;

public > LocationFragment extends Fragment {


    public static LocationFragment newInstance(String param1) {
        LocationFragment fragment = new LocationFragment();
        Bundle args = new Bundle();
        args.putString("agrs1", param1);
        fragment.setArguments(args);
        return fragment;
    }

    public LocationFragment() {

    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_location, container, false);
        Bundle bundle = getArguments();
        String agrs1 = bundle.getString("agrs1");
        TextView tv = (TextView)view.findViewById(R.id.tv_location);
        tv.setText(agrs1);
        return view;
    }



}

代码实现起来很简单，就加载布局，添加BottomNavigationItem，设置TabChangeListener就这三步搞定底部导航控制器。

代码下载地址

效果实现：