本篇内容介绍了“Android底部导航组件BottomNavigationView怎么使用”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
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
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
// 容器,承载fragment
<FrameLayout
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
// BottomNavigationView
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/nav_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:attr/windowBackground"
app:menu="@menu/bottom_nav_menu_test" />
</LinearLayout>
第二步,写BottomNavigationView所需要的菜单
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/navigation_test1"
android:icon="@drawable/ic_home_black_24dp"
android:title="测试一" />
<item
android:id="@+id/navigation_test2"
android:icon="@drawable/ic_dashboard_black_24dp"
android:title="测试二" />
<item
android:id="@+id/navigation_test3"
android:icon="@drawable/ic_notifications_black_24dp"
android:title="测试三" />
</menu>
第三步,书写testActivity文件。重点是setOnNavigationItemSelectedListener点击事件
public class TestActivity extends AppCompatActivity {
List<Fragment> 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();
}
}
}