侧菜单上的注销按钮不会重定向到LoginActivity（Android）

Question

所以我现在做了一个应用程序，我使用侧菜单来实现一些功能，比如注销，设置等。当用户需要注销时，我不得不将他重定向到LoginActivity，出于某种原因，它只是关闭侧菜单，就像没有那个项目一样。我在这里和youtube上都找过类似的问题，但没有任何帮助。而且，当按下侧菜单上的“logout_btn”时，该应用程序似乎没有错误

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {

    private BottomNavigationView bottomNav;
    private DrawerLayout root;
    private Toolbar toolbar;
    private TextView report_btn;
    private NavigationView navigationView;

    private String[] permissions;
    private LocationManager locationManager;
    private FirebaseAuth mAuth;

    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        switch(item.getItemId()){
            case R.id.logout_btn:
                mAuth.signOut();
                startActivity(new Intent(MainActivity.this, LoginActivity.class));
                break;
        }
        return true;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //Making sure no data are left
        ServiceSharedInfo.deleteALlData();
        mAuth = FirebaseAuth.getInstance();

        //Setting values
        FirebaseUser user = mAuth.getCurrentUser();

        if(user == null){
            startActivity(new Intent(MainActivity.this, LoginActivity.class));
        }else{
            System.out.println("#~#~#~#~#~#~# User: "+ user.getEmail());
        }

        permissions = new String[]{Manifest.permission.CAMERA, Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.INTERNET};
        locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

        root = findViewById(R.id.root_layout);
        toolbar = findViewById(R.id.main_tool_bar);
        navigationView = findViewById(R.id.side_nav);
        bottomNav = findViewById(R.id.bottom_navigation);
        bottomNav.setOnNavigationItemSelectedListener(navListener);
        report_btn = findViewById(R.id.report_btn);

        setSupportActionBar(toolbar);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(MainActivity.this,
                 root,toolbar,R.string.navigation_open,
                    R.string.navigation_close);
        root.addDrawerListener(toggle);
        toggle.syncState();

        getSupportFragmentManager().beginTransaction().replace(R.id.container_layout,
                new HomeFragment()).commit();
        bottomNav.getMenu().getItem(1).setChecked(true);
        report_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent emailIntent = new Intent(Intent.ACTION_SEND);

                emailIntent.setType("plain/text");
                emailIntent.putExtra(Intent.EXTRA_EMAIL, new String[]{"[e-mail]"});
                emailIntent.putExtra(Intent.EXTRA_SUBJECT, "<-Your subject here->");
                emailIntent.putExtra(Intent.EXTRA_TEXT, "<-Your Problem here->");

                startActivity(Intent.createChooser(emailIntent,"Send mail..."));
            }
        });
        navigationView.setNavigationItemSelectedListener(this::onNavigationItemSelected);

    }
    private BottomNavigationView.OnNavigationItemSelectedListener navListener =
            new BottomNavigationView.OnNavigationItemSelectedListener() {
                @Override
                public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                    Fragment fragmentSelected = null;

                    switch(item.getItemId()){
                        case R.id.home_nav:
                            fragmentSelected = new HomeFragment();
                            break;
                        case R.id.installation_nav:
                            fragmentSelected = new InstallationFragment();
                            break;
                        case R.id.damage_nav:
                            fragmentSelected = new DamageFragment();
                            break;
                    }
                    getSupportFragmentManager().beginTransaction().replace(R.id.container_layout,
                            fragmentSelected).commit();

                    return true;
                }
            };
}

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:id="@+id/root_layout"
    android:fitsSystemWindows="true">

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/side_nav"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:headerLayout="@layout/menu_header"
        app:menu="@menu/side_nav_menu"
        tools:visibility="gone" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/white"
        android:id="@+id/appBar">

        <androidx.appcompat.widget.Toolbar
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/main_tool_bar">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <ImageView
                    android:layout_width="100dp"
                    android:layout_height="30dp"
                    android:layout_alignParentStart="true"
                    android:src="@drawable/somephoto" />

                <TextView
                    android:id="@+id/report_btn"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentEnd="true"
                    android:drawableStart="@drawable/ic_baseline_priority_high_24" />

            </RelativeLayout>

        </androidx.appcompat.widget.Toolbar>

    </com.google.android.material.appbar.AppBarLayout>

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

    <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/white"
        android:clickable="false"
        app:menu="@menu/button_navigation" />

    </RelativeLayout>

</androidx.drawerlayout.widget.DrawerLayout>

side_nav_menu:

<?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>
        <item
            android:id="@+id/logout_btn"
            android:title="Log out :("
            android:icon="@drawable/ic_baseline_exit_to_app_24"/>
    </group>

</menu>

Answer 1

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
     if (item.getTitle().equals("Log out :(")) {
            mAuth.signOut();
            startActivity(new Intent(MainActivity.this, LoginActivity.class));
            return false;
     }
}

这对我有用..

试试这个...