-1

我在当前项目中使用了 BottomNavigationView。我有四个片段。这是一个 SpeedTest 应用程序。如果我在运行速度测试时尝试切换到另一个 Fragment，应用程序会崩溃。我认为是在运行时禁用底部栏。但我不知道该怎么做。有没有办法做到这一点？

这是主要活动

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle  savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    BottomNavigationView bottomNav = findViewById(R.id.bottom_navigation);
    bottomNav.setOnNavigationItemSelectedListener(navListener);

    if (savedInstanceState == null){
        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new SpeedFragment()).commit();
    }

}


 private BottomNavigationView.OnNavigationItemSelectedListener navListener = new
       BottomNavigationView.OnNavigationItemSelectedListener() {
           @Override
           public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                Fragment selectedFragment = null;
                    switch (item.getItemId()){
                    case R.id.nav_speed:
                        selectedFragment=new SpeedFragment();
                        break;
                    case R.id.nav_web:
                        selectedFragment=new WebFragment();
                        break;
                    case R.id.nav_video_test:
                        selectedFragment=new VideoFragment();
                        break;
                    case R.id.nav_history:
                        selectedFragment=new HistoryFragment();
                        break;
                }
               assert selectedFragment != null;
               getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,selectedFragment).commit();
               return true;
           }
       };

}

这是activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ui.MainActivity">

<FrameLayout
    android:id="@+id/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_above="@id/bottom_navigation"/>

<com.google.android.material.bottomnavigation.BottomNavigationView
    android:id="@+id/bottom_navigation"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    app:menu="@menu/bottom_navigation"
    android:background="?android:attr/windowBackground"
    app:labelVisibilityMode="labeled"/>

4

3 回答 3

1

您可以禁用底部导航栏，如下所示：

bottomNavigationBar.setEnabled(false);

或者您也可以隐藏底部导航栏，如下所示：

bottomNavigationBar.setVisibility(View.GONE);
于 2020-04-23T08:00:16.807 回答
0

只好申报

 BottomNavigationView bottomNav;

this 作为全局变量

并放

 bottomNav = getActivity().findViewById(R.id.bottom_navigation);

在 OncreateView() 里面

于 2020-04-23T08:25:45.767 回答
0

您需要分别禁用每个菜单项：

    for (i in 0 until bottomNavigationView.menu.size()) {
        mainBinding.bottomNavigationView.menu.getItem(i).isEnabled = false
    }
于 2022-02-17T15:00:11.230 回答