我的问题是，我试图制作一个简单的应用程序，并且我在同一个 Activity 中使用了导航栏和底部导航，但我遇到了一个简单的问题，例如当我运行应用程序时，我位于主页 fragment 中，但是当我拖动导航栏并单击电影时，它会进入电影 fragment ，并且我的电影项目被选中，但问题是当我再次单击底部导航菜单中的主页而不是导航菜单中时，电影项目仍然被选中。请告诉我，如果我单击底部导航中的主页，然后在导航栏中我的电影项目变为未选中状态，我该怎么做。
希望你能理解我的问题
这是我的代码:-
主要 Activity :-
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private FirebaseAuth mAuth;
private DrawerLayout drawerLayout;
private BottomNavigationView.OnNavigationItemSelectedListener navListener =
new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
Fragment selectedFragment = null;
switch (item.getItemId()) {
case R.id.nav_home:
selectedFragment = new HomeFragment();
break;
case R.id.nav_search:
selectedFragment = new SearchFragment();
break;
case R.id.nav_features:
selectedFragment = new FeaturesFragment();
break;
case R.id.nav_myMusic:
selectedFragment = new MyMusicFragment();
break;
}
assert selectedFragment != null;
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
selectedFragment).commit();
return true;
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
drawerLayout = findViewById(R.id.Drawyer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawerLayout, R.string.navigation_drawer_open,
R.string.navigation_drawer_close);
drawerLayout.addDrawerListener(toggle);
toggle.syncState();
mAuth = FirebaseAuth.getInstance();
BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_navigation);
bottomNavigationView.setOnNavigationItemSelectedListener(navListener);
Fragment selections = null;
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new HomeFragment()).commit();
}
}
@Override
protected void onStart() {
super.onStart();
FirebaseUser currentuser;
currentuser = mAuth.getCurrentUser();
if (currentuser == null) {
SendUserToSelectTypeActivity();
}
}
private void SendUserToSelectTypeActivity() {
Intent testintent = new Intent(MainActivity.this, Selecttype.class);
testintent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(testintent);
overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_right);
finish();
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_Movies:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new MoviesFragment()).commit();
break;
case R.id.nav_log_out:
SendUserToSelectTypeActivity();
mAuth.signOut();
break;
case R.id.nav_live:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container
, new LiveVideosFragment()).commit();
}
drawerLayout.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onBackPressed() {
if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
drawerLayout.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
}
主页 fragment :-
public class HomeFragment extends Fragment {
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_home , container , false);
}
}
导航菜单:-
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:showIn="navigation_view">
<group android:checkableBehavior="single">
<item
android:id="@+id/nav_Movies"
android:icon="@drawable/ic_movie"
android:title="Movies" />
<item
android:id="@+id/nav_live"
android:icon="@drawable/ic_movie"
android:title="Live Videos" />
</group>
<item android:title="Communicate">
<menu>
<item
android:id="@+id/nav_share"
android:icon="@drawable/ic_share_black_24dp"
android:title="Share" />
<item
android:id="@+id/nav_contact"
android:icon="@drawable/ic_report_black_24dp"
android:title="Report us" />
<item
android:id="@+id/nav_log_out"
android:icon="@drawable/ic_arrow_back_black_24dp"
android:title="Log Out" />
</menu>
</item>
</menu>
Activity main.xml:-
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout 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:id="@+id/Drawyer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:fitsSystemWindows="true"
tools:context=".MainClasses.MainActivity"
tools:openDrawer="start">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/bottom_navigation">
</FrameLayout>
<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"
android:background="@color/design_default_color_primary_dark"
app:itemIconTint="@color/White"
app:itemTextColor="@color/White"
app:menu="@menu/bottom_navigation_menu" />
</RelativeLayout>
<com.google.android.material.navigation.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:headerLayout="@layout/nav_header"
app:menu="@menu/naviation_menu_main"
>
</com.google.android.material.navigation.NavigationView>
</androidx.drawerlayout.widget.DrawerLayout>
如果您找到解决方案，请回答我
最佳答案
在可绘制文件中创建一个文件，例如“bottom_icon_color.xml”
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="true" android:color="@color/red" />
<item android:state_checked="false" android:color="@color/lightgray" />
</selector>
然后将其应用到底部导航
app:itemIconTint="@drawable/bottom_icon_color"
app:itemTextColor="@drawable/bottom_icon_color"
关于java - 如何解决导航栏有导航底部问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57572847/