android framework开发_android开发中BottomNavigationBar使用例子

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这次写个新的底部栏实现方式，BottomNavigationBar，貌似上个月谷歌发布的，使用起来也很方便下面简单介绍下使用方式，

1、compile ‘com.ashokvarma.android:bottom-navigation-bar:0.9.5’     在gradle中加入这句

2、布局文件

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="com.example.chenxu.mybottomdemo.MainActivity">


    android:id="@+id/ll_root"

    android:orientation="vertical"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:layout_above="@+id/bottom_bar"

    />

    
        android:id="@+id/bottom_bar"

        android:layout_width="match_parent"

        android:layout_height="50dp"

        android:layout_alignParentBottom="true" />

 

3、Java代码

package com.example.chenxu.mybottomdemo;

 

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentTransaction;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

 

import com.ashokvarma.bottomnavigation.BottomNavigationBar;

import com.ashokvarma.bottomnavigation.BottomNavigationItem;

 

 

public class MainActivity extends AppCompatActivity implements BottomNavigationBar.OnTabSelectedListener {

    private BottomNavigationBar mBottomBar;

    private FragmentOne fragmentOne;

    private FragmentTwo fragmentTwo;

    private FragmentThree fragmentThree;

    private FragmentFore fragmentFore;

    private FragmentFive fragmentFive;

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        assignViews();

    }

 

    /**

     * 添加页面

     */

    private void assignViews() {

        mBottomBar = (BottomNavigationBar) findViewById(R.id.bottom_bar);

        mBottomBar.addItem(new BottomNavigationItem(R.mipmap.ic_launcher, "首页"))

                .addItem(new BottomNavigationItem(R.mipmap.ic_launcher, "商品"))

                .addItem(new BottomNavigationItem(R.mipmap.ic_launcher, "分类"))

                .addItem(new BottomNavigationItem(R.mipmap.ic_launcher, "购物车"))

                .addItem(new BottomNavigationItem(R.mipmap.ic_launcher, "我的"))

                .initialise();

        mBottomBar.setTabSelectedListener(this);//设置监听

        setDefaultFragment();//设置默认选项

    }

    private void setDefaultFragment() {

        FragmentManager fragmentManager=getSupportFragmentManager();

        FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();

        hideFragments(fragmentTransaction);

        fragmentOne=new FragmentOne();

        fragmentTransaction.add(R.id.ll_root,fragmentOne);

        fragmentTransaction.commit();

    }

 

    /**

     * 隐藏fragment

     * @param transaction

     */

    private void hideFragments(FragmentTransaction transaction) {

        if (fragmentOne != null) {

            transaction.hide(fragmentOne);

        }

        if (fragmentTwo != null) {

            transaction.hide(fragmentTwo);

        }

        if (fragmentThree != null) {

            transaction.hide(fragmentThree);

        }

        if (fragmentFore != null) {

            transaction.hide(fragmentFore);

        }

        if (fragmentFive != null) {

            transaction.hide(fragmentFive);

        }

    }

 

    @Override

    public void onTabSelected(int position) {

        FragmentManager fragmentManager=getSupportFragmentManager();

        FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();

        hideFragments(fragmentTransaction);

        switch (position){

            case 0:

                if (fragmentOne==null){

                    fragmentOne=new FragmentOne();

                    fragmentTransaction.add(R.id.ll_root,fragmentOne);

 

                }else {

                    fragmentTransaction.show(fragmentOne);

                }

                break;

            case 1:

                if (fragmentTwo==null){

                    fragmentTwo=new FragmentTwo();

                    fragmentTransaction.add(R.id.ll_root,fragmentTwo);

 

                }else {

                    fragmentTransaction.show(fragmentTwo);

                }

                break;

            case 2:

                if (fragmentThree==null){

                    fragmentThree=new FragmentThree();

                    fragmentTransaction.add(R.id.ll_root,fragmentThree);

 

                }else {

                    fragmentTransaction.show(fragmentThree);

                }

                break;

            case 3:

                if (fragmentFore==null){

                    fragmentFore=new FragmentFore();

                    fragmentTransaction.add(R.id.ll_root,fragmentFore);

 

                }else {

                    fragmentTransaction.show(fragmentFore);

                }

                break;

            case 4:

                if (fragmentFive==null){

                    fragmentFive=new FragmentFive();

                    fragmentTransaction.add(R.id.ll_root,fragmentFive);

 

                }else {

                    fragmentTransaction.show(fragmentFive);

                }

                break;

        }

        fragmentTransaction.commit();

    }

 

    @Override

    public void onTabUnselected(int position) {

 

    }

 

    @Override

    public void onTabReselected(int position) {

 

    }

}

注：每个底部按钮对应一个fragment即可，以上就是全部内容，用起来效果不错，推荐使用

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