[英]BottomNavigationView doesn't appear after running it in the emulator
my BottomNavigationView appear in the preview of the android studio but when i run it in emulator it doesn't appear so it's only the fragment which appear in the emulator and the program isn't give me any error so i tried to switch the home page layout and it also doesn't appear!我的BottomNavigationView出现在android studio的预览中,但是当我在模拟器中运行它时它没有出现所以它只是出现在模拟器中的片段并且程序没有给我任何错误所以我试图切换主页布局,它也没有出现!
and here is my code这是我的代码
in the Home_activity xml在 Home_activity xml 中
public class HomeActivity extends AppCompatActivity {
@Override
public void onCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) {
super.onCreate(savedInstanceState, persistentState);
setContentView(R.layout.activity_home);
BottomNavigationView bottomNavigationView =findViewById(R.id.nav_view);
bottomNavigationView.setOnNavigationItemSelectedListener(navlistener);
}
private BottomNavigationView.OnNavigationItemSelectedListener navlistener = new BottomNavigationView.OnNavigationItemSelectedListener(){
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
Fragment selectedFragment =null;
switch (menuItem.getItemId()){
case R.id.navigation_home:
selectedFragment=new Home_fragment();
break;
case R.id.navigation_dashboard:
selectedFragment=new Dashboard_fragment();
break;
case R.id.navigation_notifications:
selectedFragment=new Notificatons_fragment();
break;
}
//to show them
getSupportFragmentManager().beginTransaction().replace(R.id.nav_host_fragment,selectedFragment).commit();
return true;
}
};
} }
in xml of the home layout page在主页布局页面的 xml 中
<?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"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="?attr/actionBarSize">
<fragment
android:id="@+id/nav_host_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@id/nav_view"/>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/nav_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
app:menu="@menu/bottom_nav_menu"
/>
</RelativeLayout>
Add library in gradle file
在 gradle 文件中添加库
dependencies {
implementation 'com.google.android.material:material:1.1.0'
}
Xml file without fragment tag.
没有片段标签的 XML 文件。 fragment is giving error on my side.
片段在我这边出错。
<?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"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="?attr/actionBarSize">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/nav_view"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_alignParentBottom="true"
app:menu="@menu/bottom_nav_menu"
/>
</RelativeLayout>
bottom_nav_menu.xml file in menu folder in res
res 中 menu 文件夹中的 bottom_nav_menu.xml 文件
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/home"
android:icon="@android:drawable/arrow_down_float"
android:title="home" />
<item
android:id="@+id/id1"
android:icon="@android:drawable/btn_plus"
android:title="deeplink" />
</menu>
You can change your custom icons in menu.
您可以在菜单中更改自定义图标。 Try it.
尝试一下。 Hopefully, may resolve you issue your issue.
希望可以解决您的问题。 I have tested it on Android Q emulator.
我已经在 Android Q 模拟器上测试过了。 Thanks in advance.
提前致谢。
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