1. 在app的build.gradle文件中添加design库的依赖：

dependencies {
    implementation 'com.android.support:design:version number'
}

2. 在XML布局文件中添加BottomNavigationView组件：

3. 在res/menu目录下创建navigation.xml文件，用来定义底部导航栏菜单选项和图标，如下所示：

4. 在MainActivity中实现底部导航栏选项的切换：

public class MainActivity extends AppCompatActivity implements BottomNavigationView.OnNavigationItemSelectedListener {
    private TextView mTextMessage;
    private BottomNavigationView mNavigation;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextMessage = (TextView) findViewById(R.id.message);
        mNavigation = (BottomNavigationView) findViewById(R.id.navigation);
        mNavigation.setOnNavigationItemSelectedListener(this);
    }

    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.navigation_home:
                mTextMessage.setText(R.string.title_home);
                return true;
            case R.id.navigation_dashboard:
                mTextMessage.setText(R.string.title_dashboard);
                return true;
            case R.id.navigation_notifications:
                mTextMessage.setText(R.string.title_notifications);
                return true;
        }
        return false;
    }

}

此时，点击底部导航栏的选项，会切换对应页面的显示。