Android DataBinding 正在泄漏内存

Question

我正在使用数据绑定(bind)并且我已经声明了 lateinit var对于绑定(bind)以及当我要去不同的 fragment Leaky canary 显示泄漏时。

fragment

class HomeFragment : BottomNavViewHostBaseFragment() {

    private lateinit var viewModel: HomeViewModel
    private lateinit var binding: FragmentHomeBinding

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        viewModel = ViewModelProviders.of(this).get(HomeViewModel::class.java)
        binding = DataBindingUtil.inflate(inflater, R.layout.fragment_home, container, false)
        binding.lifecycleOwner = viewLifecycleOwner
        binding.viewModel = viewModel
        return binding.root
    }

   ...
}

这是来自 Leaky Carny 的信息

androidx.constraintlayout.widget.ConstraintLayout has leaked:
Toast$TN.mNextView
↳ LinearLayout.mContext
↳ MainActivity.navigationView
↳ NavigationView.listener
↳ BaseFragment$setNavigationDrawerItemSelectedListener$1.this$0 (anonymous implementation of com.google.android.material.navigation.NavigationView$OnNavigationItemSelectedListener) ↳ OrdersHostFragment.mFragmentManager
↳ FragmentManagerImpl.mActive
↳ HashMap.table
↳ array HashMap$HashMapEntry[].[0]
↳ HashMap$HashMapEntry.value
↳ HomeFragment.!(binding)!
↳ FragmentHomeBindingImpl.!(mboundView0)!
↳ ConstraintLayout

我该如何解决这个问题，我需要做什么binding=null里面 onDestroyView ?但是，如果我需要这样做，那么 binding.lifecycleOwner = viewLifecycleOwner 的意义何在？然后？

Answer 1

这是来自 google docs 的推荐方式初始化和清除 Fragments 中的绑定(bind):

Kotlin :

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
}

java :

private ResultProfileBinding binding;

@Override
public View onCreateView (LayoutInflater inflater, 
                          ViewGroup container, 
                          Bundle savedInstanceState) {
    binding = ResultProfileBinding.inflate(inflater, container, false);
    View view = binding.getRoot();
    return view;
}

@Override
public void onDestroyView() {
    super.onDestroyView();
    binding = null;
}

另外，这里是 medium blog post阅读以摆脱与 Property Delegate 的绑定(bind)内存泄漏。