android-运算符==不能应用于Kotlin中的’Long’和’Int’

我正在尝试在Kotlin中实现Mike Penz的NavigationDrawer(https://github.com/mikepenz/MaterialDrawer)的某些部分.从那以后,我只遇到了几个问题,主要是关于操作符的.这是实例化抽屉本身的代码的一部分.除了在int和Long变量上使用==运算符的地方,Android Studio不会引发任何错误：

        // Create the Drawer
        result = DrawerBuilder()
                .withSliderBackgroundColor(ContextCompat.getColor(applicationContext, R.color.top_header))
                .withActivity(this)
                .withToolbar(toolbar)
                .withHasStableIds(true)
                .withItemAnimator(AlphaCrossFadeAnimator())
                .withAccountHeader(headerResult!!)
                .addDrawerItems(
                        PrimaryDrawerItem().withName(R.string.drawer_item_profile).withIcon(FontAwesome.Icon.faw_user).withIdentifier(1).withSelectable(false).withIconColor(ContextCompat.getColor(applicationContext, R.color.icon_grey)).withTextColor(ContextCompat.getColor(applicationContext, R.color.stroke)),
                        PrimaryDrawerItem().withName(R.string.drawer_item_create).withIcon(FontAwesome.Icon.faw_paint_brush).withIdentifier(2).withSelectable(false).withIconColor(ContextCompat.getColor(applicationContext, R.color.icon_grey)).withTextColor(ContextCompat.getColor(applicationContext, R.color.stroke)),
                        PrimaryDrawerItem().withName(R.string.drawer_item_yaanich_news).withIcon(FontAwesome.Icon.faw_newspaper_o).withIdentifier(3).withSelectable(false).withIconColor(ContextCompat.getColor(applicationContext, R.color.icon_grey)).withTextColor(ContextCompat.getColor(applicationContext, R.color.stroke)),
                        PrimaryDrawerItem().withName(R.string.drawer_item_my_groups).withIcon(FontAwesome.Icon.faw_users).withIdentifier(4).withSelectable(false).withIconColor(ContextCompat.getColor(applicationContext, R.color.icon_grey)).withTextColor(ContextCompat.getColor(applicationContext, R.color.stroke)),
                        PrimaryDrawerItem().withName(R.string.drawer_item_settings).withIcon(FontAwesome.Icon.faw_cog).withIdentifier(5).withSelectable(false).withIconColor(ContextCompat.getColor(applicationContext, R.color.icon_grey)).withTextColor(ContextCompat.getColor(applicationContext, R.color.stroke))
                )
                .withOnDrawerItemClickListener { view, position, drawerItem ->

                    if (drawerItem != null) {
                        var intent: Intent? = null
                        if (drawerItem.identifier == (1) {
                            intent = Intent(this, UserProfileActivity::class.java)
                        } else if (drawerItem.identifier == 2) {
                            intent = Intent(this, YeetActivity::class.java)
                        } else if (drawerItem.identifier == 3) {
                            intent = Intent(this, RssActivity::class.java)
                        } else if (drawerItem.identifier == 4) {
                            intent = Intent(this, GroupsActivity::class.java)
                        } else if (drawerItem.identifier == 5) {
                            intent = Intent(this, UserSettingsActivity::class.java)
                        }
                        if (intent != null) {
                            this.startActivity(intent)
                        }
                    }
                    false
                }
                .withSavedInstance(savedInstanceState)
                .withShowDrawerOnFirstLaunch(true)
                .build()

        RecyclerViewCacheUtil<IDrawerItem<*, *>>().withCacheSize(2).apply(result!!.recyclerView, result!!.drawerItems)

        if (savedInstanceState == null) {
            result!!.setSelection(21, false)
            headerResult!!.activeProfile = profile
        }
    }

错误：

如果(drawerItem.identifier ==(1)

如果(drawerItem.identifier == 2)

运算符==不能应用于’Long and”Int’

解决方法:

只需在右侧长时间使用

if (drawerItem.identifier == 1L)

编辑：之所以需要这样做,是因为Kotlin不会将Ints提升为Longs(或更普遍的是,不会扩展类型)；左边是Long,右边是Int,这会导致错误.明确指出右侧是Long可以修复错误.

标签：android,kotlin,operator-keyword
来源： https://codeday.me/bug/20191010/1886478.html