如何制作按钮而不是打开导航抽屉

Question

我在我的应用程序中成功实现了导航抽屉，将菜单的每个项目链接到一个片段。目标片段隐藏了DrawerToggle并显示了向上按钮（即箭头图标），但是由于任何原因，如果我单击它，它将打开抽屉，而我无法返回上一个片段。我必须按“后退”按钮来执行此操作。我该如何改变这种行为？是否可以解决这个问题而无需在每个片段中添加代码？

我使用什么：

• 导航组件
• 一个活动，一些片段
• 工具栏
• AppBarConfiguration

MainActivity

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        // Setup FTUE conditional navigation
        setupNavigation()

        setupNavigationDrawer()

        appBarConfiguration =
            AppBarConfiguration(
                setOf(R.id.overviewFragment, R.id.registrationFragment,
                       R.id.registrationParamFragment), drawerLayout)
        setupActionBarWithNavController(navController, appBarConfiguration)
        findViewById<NavigationView>(R.id.nav_view)
            .setupWithNavController(navController)
    }

    /**
     * Set the toolbar, set the drawerLayout, set the drawerToggle
     */
    private fun setupNavigationDrawer() {
        toolbar = findViewById(R.id.toolbar)

        setSupportActionBar(toolbar)

        drawerLayout = (findViewById<DrawerLayout>(R.id.drawer_layout))
            .apply {
                setStatusBarBackground(R.color.colorPrimaryDark)
            }
        drawerToggle = ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.open, R.string.close)
        drawerToggle.setDrawerIndicatorEnabled(true)
        drawerToggle.syncState()

        drawerLayout.addDrawerListener(drawerToggle)

    }

    override fun onPostCreate(savedInstanceState: Bundle?, persistentState: PersistableBundle?) {
        super.onPostCreate(savedInstanceState, persistentState)
        drawerToggle.syncState()
    }

    /**
     * Ensures that the drawer is closed
     * before the app switches back to the previous fragment
     */
    override fun onBackPressed() {
        if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
            drawerLayout.closeDrawer(GravityCompat.START)
        } else {
            super.onBackPressed()
        }
    }
}

完整库：Github

Answer 1

为什么不利用继承？创建具有此代码的MonitorCardiacoActivity，并且您使用的每个Activity都应继承MonitorCardiacoActivity。