我的问题是我试图制作一个简单的应用程序，并且在同一活动中同时使用了导航栏和底部导航，但是我遇到一个简单的问题，例如当我运行该应用程序时，主页片段，但是当我拖动导航栏并单击电影时，它进入了电影片段，并且我的电影项目得到了检查，但是问题是当我再次在底部导航菜单中单击首页而不是在我的导航菜单中单击电影项目时仍然被检查。请告诉我，如果我在底部导航中单击“首页”，然后在导航栏中未选中我的电影项目，该怎么办？
希望您能理解我的问题
这是我的代码：-
MainActivity：-
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();
}
}
}
HomeFragment：-
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>
活动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>
如果找到解决方法，请回答我
答案 0 :(得分：0)
根据您在问题中提到的问题 您必须先存储先前单击的MenuItem，然后使用MenuItem的setCheckable（false）将其设为未选中状态。
我假设所有其他功能都正常工作，例如，当选择了底部导航项时，请检查NavigationView的项。
在您的onNavigationItemSelected商店中，在一个变量中单击的MenuItem表示MenuItem类型的prevMenuItem。 现在，在您的BottomNavigationView.OnNavigationItemSelectedListener（）中，将此prevMenuItem设为未选中状态。
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.getMenu().findItem(previousMenuItem.getId()).setCheckable(false);
答案 1 :(得分：0)
在可绘制文件中制作一个文件，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>
然后将其应用于您的底部导航
app:itemIconTint="@drawable/bottom_icon_color"
app:itemTextColor="@drawable/bottom_icon_color"