Android底部导航组件BottomNavigationView

目录

• 什么是BottomNavigationView
• BottomNavigationView的简单用法

什么是BottomNavigationView

底部菜单栏

BottomNavigationView的简单用法

需求：如上图所示。点击测试一菜单，展示test1fragment。点击测试二菜单，展示test2fragment。点击测试三菜单，展示test3fragment。

第一步，testActivity布局

  // 容器，承载fragment
  
  // BottomNavigationView
  

第二步，写BottomNavigationView所需要的菜单

第三步，书写testActivity文件。重点是setOnNavigationItemSelectedListener点击事件

public class TestActivity extends AppCompatActivity {
  List mFragments = new ArrayList<>();
  test1Fragment t1f = new test1Fragment();
  test2Fragment t2f = new test2Fragment();
  test3Fragment t3f = new test3Fragment();
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_test);
    BottomNavigationView navView = findViewById(R.id.nav_view);
    mFragments.add(t1f);
    mFragments.add(t2f);
    mFragments.add(t3f);
    // navView 点击事件
    navView.setOnNavigationItemSelectedListener((item)->{
      switchFragment(item.getItemId());
      return true;
    });
  }
  private void switchFragment(int id) {
    Fragment fragment = null;
    switch (id) {
      case R.id.navigation_test1:
        fragment = mFragments.get(0);
        break;
      case R.id.navigation_test2:
        fragment = mFragments.get(1);
        break;
      case R.id.navigation_test3:
        fragment = mFragments.get(2);
        break;
      default:
        break;
    }
    if (fragment != null) {
      getSupportFragmentManager().beginTransaction().replace(R.id.nav_host_fragment,fragment).commit();
    }
  }
}

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