控制器创建重复视图

Question

我有一个应用

BaseListActivity 托管

BaseController -> 充当 ViewPager

ListController -> ViewPager 的选项卡 1

FavoriteController -> ViewPager 的选项卡 2

DetailActivity -> 在选项卡 1 上单击项目时启动

DetailController -> 在 DetailActivity

中推送到视图

所以代码给你一个想法。

activity.xml:

<LinearLayout android:id="@+id/mainLayout"
          xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:orientation="vertical">

<com.bluelinelabs.conductor.ChangeHandlerFrameLayout
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

BaseListActivity:

class CoinListActivity : AppCompatActivity() {

private lateinit var router: Router

/**
 * Current implementation uses BlueLineLabs Router to navigate between views and handle animations
 */
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_coin_list)

    router = Conductor.attachRouter(this, container, savedInstanceState)

    router.setRoot(RouterTransaction.with(CoinBaseController()))

    RoomSingleton.initDB(this)
.
.
.

基础控制器：

class CoinBaseController : Controller() {


override fun onCreateView(inflater: LayoutInflater, container: ViewGroup): View {
    return inflater.inflate(R.layout.coin_base_controller, container, false).apply {
        viewPager.adapter = TabAdapter()
        tabs.setupWithViewPager(viewPager)
    }
}

.
.
.

inner class TabAdapter : RouterPagerAdapter(this) {
    override fun configureRouter(router: Router, position: Int) {
        router.setPopsLastView(true)
        when (position) {
            0 -> router.pushController(RouterTransaction.with(CoinListController.newInstance()))
            1 -> router.pushController(RouterTransaction.with(CoinFavoriteController()))
        }
        if (router.hasRootController().not())
            router.setRoot(RouterTransaction.with(this@CoinBaseController))
    }

    override fun getCount(): Int = 2

    override fun getPageTitle(position: Int): CharSequence? {
        return if (position == 0)
            "List"
        else
            "Favorites"
    }
}

}

CoinListController:

    class CoinListController : BaseMvvmController<CoinListViewModel, CoinListContract.State>(), CoinListAdapter
.CoinListListener {
var list: List<CoinListItem> = emptyList()
var recyclerView: RecyclerView? = null
lateinit var swipeLayout: SwipeRefreshLayout

private val adapter by lazy(LazyThreadSafetyMode.NONE) {
    CoinListAdapter(applicationContext!!, this)
}


override fun onCreateView(inflater: LayoutInflater, container: ViewGroup): View {
    val view = inflater.inflate(R.layout.coin_list_controller, container, false)
    swipeLayout = view.findViewById(R.id.swipeContainer)
    recyclerView = view.findViewById(R.id.listRecycler)
    recyclerView!!.layoutManager = LinearLayoutManager(activity)
    recyclerView!!.addItemDecoration(DividerItemDecoration(activity,
            DividerItemDecoration.VERTICAL))
    recyclerView!!.adapter = adapter
    recyclerView!!.isNestedScrollingEnabled = false
    view.swipeContainer.apply {
        this.setOnRefreshListener {
            viewModel.getCoinList()
            this.isRefreshing = false
        }
    }
    return view
}


override fun onAttach(view: View) {
    super.onAttach(view)
    with(viewModel) {
        if (list.isEmpty()) {
            getCoinList()
            setSearchListener(view)
        } else {
            view.listRecycler.adapter = adapter
            adapter.notifyDataSetChanged()
        }
    }

}

override fun onDetach(view: View) {
    super.onDetach(view)
    view.listRecycler.adapter = null
    println("Detached")
}


override fun onCoinClicked(coin: CoinListItem) {
    viewModel.onCoinClicked(coin)
}

override fun onFavoriteClicked(coinFavoriteItem: CoinFavoriteItem) {
    viewModel.onFavoriteClicked()
}

override val viewModel: CoinListViewModel = get().koin.get()

override fun onStateChange(state: Mvvm.State) {
    when (state) {
        is CoinListContract.State.CoinListReceived -> {
            list = state.coins
            adapter.addItems(list)
        }
        is CoinListContract.State.CoinItemClicked -> {
            Snackbar.make(view!!, "Coin Item Clicked", Snackbar.LENGTH_SHORT)
            //router.onActivityStarted()
            startActivity(CoinDetailActivity.getLaunchIntent(activity!!, state.coin))
        }
        is CoinListContract.State.FavoriteClicked -> {
            Snackbar.make(view!!, "Favorite Button Clicked", Snackbar.LENGTH_SHORT)
        }
        is CoinListContract.State.QueryRan -> {
            adapter.addItems(state.searchList)
        }
        is CoinListContract.State.Error -> {
            Log.d("OnStateChange", state.throwable.localizedMessage!!)
        }
    }
}

所以问题出在CoinListController，当我点击一个列表项时，DetailActivity被启动，然后我退出..return到CoinListController。

但是，对于项目的每次后续点击，都会添加一个额外的侦听器（我认为）。因此，如果我第 3 次单击某个项目，CoinListController.onCoinClicked 将被调用 3 次，从而创建 CoinDetailActivity 的 3 个实例。所以我必须按回键 3 次才能 return 到 CoinListController.

此行为在调试模式下不存在..

我在分离时将适配器设置为空。什么在控制器的生命周期中持续存在？是我在适配器中设置的侦听器还是其他？

Answer 1

在 CoinListActivity 和 CoinBaseController 中设置根两次导致了问题

控制器创建重复视图

Controller creating duplicate views

android

controller

android-lifecycle

conductor