Dropbox 如何解决Android App的内存泄漏问题？

<failure>Test failed because application memory leaks were detected: ==================================== HEAP ANALYSIS RESULT ==================================== 4 APPLICATION LEAKS References underlined with "~~~" are likely causes. Learn more at https://squ.re/leaks. 198449 bytes retained by leaking objects Signature: 6bf2ba80511dcb6ab9697257143e3071fca4 ┬─── 
│ GC Root: System class 
│ ├─ com.airbnb.mvrx.mocking.MockableMavericks class 
│ Leaking: NO (a class is never leaking) 
│ ↓ static MockableMavericks.mockStateHolder 
│                            ~~~~~~~~~~~~~~~ 
├─ com.airbnb.mvrx.mocking.MockStateHolder instance 
│ Leaking: UNKNOWN 
│ ↓ MockStateHolder.delegateInfoMap 
│                   ~~~~~~~~~~~~~~~ 
├─ java.util.LinkedHashMap instance 
│ Leaking: UNKNOWN 
│ ↓ LinkedHashMap.header 
│                 ~~~~~~ 
├─ java.util.LinkedHashMap$LinkedEntry instance 
│ Leaking: UNKNOWN 
│ ↓ LinkedHashMap$LinkedEntry.prv 
│                             ~~~ 
├─ java.util.LinkedHashMap$LinkedEntry instance 
│ Leaking: UNKNOWN 
│ ↓ LinkedHashMap$LinkedEntry.key 
│                             ~~~ 
╰→ com.dropbox.product.android.dbapp.photos.ui.view.PhotosFragment instance 
   Leaking: YES (ObjectWatcher was watching this because com.dropbox.product.android.dbapp.photos.ui.view.PhotosFragment received Fragment#onDestroy() callback and Fragment#mFragmentManager is null) 
   key = 391c9051-ad2c-4282-9279-d7df13d205c3 
   watchDurationMillis = 7304 
   retainedDurationMillis = 2304 198427 bytes retained by leaking objects 
   Signature: d1c9f9707034dd15604d8f2e63ff3bf3ecb61f8

   @After
    fun teardown() {
        scenario.close()
        val holder = MockableMavericks.mockStateHolder
        holder.clearAllMocks()
    }

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.TYPE})
public @interface SkipLeakDetection {
    /**
     * The reason why the test should skip leak detection.
     */
    String value();
}

override fun skipLeakDetectionReason(description: Description): String? {
    return when {
        description.getAnnotation(SkipLeakDetection::class.java) != null ->
            "is annotated with @SkipLeakDetection"
        description.testClass.isAnnotationPresent(SkipLeakDetection::class.java) ->
            "class is annotated with @SkipLeakDetection"
        else -> null
    }
}

private var _binding: ResultProfileBinding? = null
// This property is only valid between onCreateView and
// onDestroyView.
private val binding get() = _binding!!
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?
): View? {
    _binding = ResultProfileBinding.inflate(inflater, container, false)
    val view = binding.root
    return view
}
override fun onDestroyView() {
    super.onDestroyView()
    _binding = null
}

interface ViewBindingHolder<B : ViewBinding> {
    var binding: B?
    // Only valid between onCreateView and onDestroyView.
    fun requireBinding() = checkNotNull(binding)
    fun requireBinding(lambda: (B) -> Unit) {
        binding?.let {
            lambda(it)
        }}
    /**
     * Make sure to use this with Fragment.viewLifecycleOwner
     */
    fun registerBinding(binding: B, lifecycleOwner: LifecycleOwner) {
        this.binding = binding
        lifecycleOwner.lifecycle.addObserver(object : DefaultLifecycleObserver {
            override fun onDestroy(owner: LifecycleOwner) {
                owner.lifecycle.removeObserver(this)
                this@ViewBindingHolder.binding = null
            }
        })
    }
}
interface DataBindingHolder<B : ViewDataBinding> : ViewBindingHolder<B>