Rxjava, combineLatest 和 RxTextView 内存泄漏

Question

我正在尝试将 combineLatest 与多个 RxTextViews 一起使用，并且我认为我正在正确处理我的 Disposables，但看起来我仍然存在内存泄漏。

val one = RxTextView.afterTextChangeEvents(one)
            val two = RxTextView.afterTextChangeEvents(two)
            val three = RxTextView.afterTextChangeEvents(three)
            val four = RxTextView.afterTextChangeEvents(four)
            val five = RxTextView.afterTextChangeEvents(five)

            val disposable = Observables.combineLatest(one, two, three, four, five) { oneEvent, twoEvent, threeEvent, fourEvent, fiveEvent ->
                 //combining happening with these strings: oneEvent.view().text.toString  }
                    .skip(1) 
                    .debounce(1000, TimeUnit.MILLISECONDS)
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribe {
                        //network call
                    }
            compositeDisposable.add(disposable)
        }

然后在我的onStop 中处理它。

override fun onStop() {
    super.onStop()
    if (!compositeDisposable.isDisposed) {
        compositeDisposable.dispose()
    }
}

我读到如果在 onNext() 方法中引用了某些视图，那么我认为可能会发生 NullPointerException。这是我得到的 NPE：

fatal Exception: java.lang.NullPointerException: view == null
       at com.jakewharton.rxbinding2.internal.Preconditions.checkNotNull(Preconditions.java:27)
       at com.jakewharton.rxbinding2.widget.RxTextView.afterTextChangeEvents(RxTextView.java:159)
       at MyFragment$setUpTextListeners$1.execute(MyFragment.kt:170)

这是我正在使用的片段：

private lateinit var viewModel: MyViewModel
private lateinit var binding: FragmentMyThingsBinding

private val compositeDisposable = CompositeDisposable()

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {

    binding = FragmentMyThingsBinding.inflate(inflater, container, false)
    viewModel = ViewModelProviders.of(this).get(MyViewModel::class.java)
    binding.viewModel = viewModel

    //calls to kick off business logic

    return binding.root
}


override fun onStart() {
    super.onStart()

    setUpTextListeners()
}

override fun onStop() {
    super.onStop()
    if (!compositeDisposable.isDisposed) {
        compositeDisposable.dispose()
    }
}

private fun setUpTextListeners() {

    val one = RxTextView.afterTextChangeEvents(one)
    val two = RxTextView.afterTextChangeEvents(two)
    val three = RxTextView.afterTextChangeEvents(three)
    val four = RxTextView.afterTextChangeEvents(four)
    val five = RxTextView.afterTextChangeEvents(five)

    compositeDisposable.add(Observables.combineLatest(one, two, three, four, five) { oneEvent, twoEvent, threeEvent, fourEvent, fiveEvent ->
            //combine here using oneEvent.view().text.toString  }
            .skip(1)
            .debounce(1000, TimeUnit.MILLISECONDS)
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe {
                //network call
            })

    }
}

Answer 1

您传递给RxTextView.afterTextChangeEvents 的其中一个视图为空。有assert in that function，用于检查null 上的传入参数。

而且这个问题与内存泄漏无关。

编辑： 将合成视图属性更改为使用 binding.editText 解决了该问题。 （在cmets中讨论）