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android - 使用 onNavigationSelect 注销

问题描述

这是我注销到 logInActivity 的代码。虽然我的片段有效，但我的注销按钮却无效。可能有什么问题？

    public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{

    FirebaseUser mFirebaseAuth;
    DatabaseReference dbref;
    private AppBarConfiguration mAppBarConfiguration;
    private DrawerLayout drawer;

    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
        if (menuItem.getItemId() == R.id.nav_logout) {
            FirebaseAuth.getInstance().signOut();
            Intent toMain = new Intent(getApplicationContext(), LogInActivity.class);
            toMain.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(toMain);
        }
        return true;
    }

获取 firebase 实例 - 忽略 FAB。

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mFirebaseAuth = FirebaseAuth.getInstance().getCurrentUser();
        dbref = FirebaseDatabase.getInstance().getReference("User").child(mFirebaseAuth.getUid());

        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });

将每个菜单 ID 作为一组 ID 传递，因为每个菜单都应被视为顶级目的地。膨胀菜单；如果存在，这会将项目添加到操作栏。

        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        NavigationView navigationView = findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);

        mAppBarConfiguration = new AppBarConfiguration.Builder(
                R.id.nav_home, R.id.nav_settings, R.id.nav_task)
                .setDrawerLayout(drawer)
                .build();
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
        NavigationUI.setupWithNavController(navigationView, navController);
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onSupportNavigateUp() {
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        return NavigationUI.navigateUp(navController, mAppBarConfiguration)
                || super.onSupportNavigateUp();
    }
}

标签： androidfirebase

解决方案

implements NavigationView.OnNavigationItemSelectedListener在课堂上实施

在 onCreate 函数中

        NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
        NavigationUI.setupWithNavController(navigationView, navController);
        navigationView.setNavigationItemSelectedListener(this);

在类中添加函数

    @Override
    public boolean onNavigationItemSelected(MenuItem menuItem) {
        int id = menuItem.getItemId();
        if(id == R.id.nav_logout) {
            ...
            return true;
        }
        else {
            boolean handled = NavigationUI.onNavDestinationSelected(menuItem, navController);
            if (handled)
                drawer.closeDrawer(navigationView);
            return handled;
        }

    }

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