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I'm using LeakCanary to detect memory leaks in an app. I successfully identified and fixed some leaks using it, but I am struggling find the root of this leak:
* android.support.constraint.ConstraintLayout has leaked:
* Toast$TN.mNextView
* ↳ LinearLayout.mContext
* ↳ HomeActivity.!(mDelegate)!
* ↳ AppCompatDelegateImplN.!(mActionBar)!
* ↳ ToolbarActionBar.!(mDecorToolbar)!
* ↳ ToolbarWidgetWrapper.!(mToolbar)!
* ↳ Toolbar.mParent
* ↳ ConstraintLayout
* Reference Key: 552b5bc5-409d-44c4-8412-87341237ae6d
* Device: samsung samsung SM-G960F starltexx
* Android Version: 8.0.0 API: 26 LeakCanary: 1.6.2 0ebc1fc
* Durations: watch=5769ms, gc=153ms, heap dump=933ms, analysis=5802ms
Is this leak caused by the Android SDK or app specific code?
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A ConstraintLayout is a ViewGroup which allows you to position and size widgets in a flexible way. Note: ConstraintLayout is available as a support library that you can use on Android systems starting with API level 9 (Gingerbread). As such, we are planning on enriching its API and capabilities over time.
Open the layout file (activity_main. xml) in Android Studio and click the Design tab at the bottom of the editor window. In the Component Tree window, right-click LinearLayout and then choose Convert layout to ConstraintLayout from the context menu.
constraintlayout:constraintlayout:2.1. 0 is released. This is the final release for 2.1. 0.
Bias, in terms of ConstraintLayout , means "if there is extra room, slide the widget in this direction along the axis". The default bias is 0.5, meaning that the widget is centered in the available space.
The leak was caused by app specific code. One fragment called getActivity().setSupportActionBar() with a view contained in the fragments layout. When switching to another fragment the resources couldn't get gc'ed because the activity was still holding a reference to the no longer visible toolbar.
I fixed this leak by calling getActivity().setSupportActionBar(null) in the fragments onDestroyView() method, which removes the reference to the toolbar.
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