【Android -- Material Design】BottomNavigationView 的基本使用

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官网：BottomNavigationView

引入 material 包：

implementation 'com.google.android.material:material:1.2.1'

效果图

使用

1. 布局

2. 颜色选择器 bottom_navigation_item_selector.xml

    
    


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3. 菜单 main_bottom_navigation.xml

4. 逻辑代码 MainActivity.java

public class MainActivity extends BaseActivity {
    private HomeFragment mHomeFragment = HomeFragmentFactory.getInstance().getHomeFragment();
    private MineFragment mMineFragment = HomeFragmentFactory.getInstance().getMineFragment();

    private List mFragments = new ArrayList();

    @BindView(R.id.bottomNavigationView)
    BottomNavigationView mNavigationView;

    @Override
    public int getLayoutId() {
        return R.layout.activity_main;
    }

    @Override
    public void initView() {
        mFragments.add(mHomeFragment);
        mFragments.add(mMineFragment);

        mNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switchFragment(item.getItemId());
                return true;
            }
        });

        switchFragment(R.id.menu_message);
    }

    /**
     * 切换fragment
     *
     * @param id
     * @return
     */
    private void switchFragment(int id) {
        Fragment fragment = null;
        switch (id) {
            case R.id.menu_message:
                fragment = mFragments.get(0);
                break;

            case R.id.menu_contacts:
                fragment = mFragments.get(1);
                break;

            default:
                break;
        }
        if (fragment != null) {
            getSupportFragmentManager().beginTransaction().replace(R.id.fl_content,fragment).commit();
        }
    }


}