diousk

viewLifecycleOwner.lifecycleScope.launchWhenResumed {
    context?.hideKeyboard(searchView)
    awaitKeyboardHidden() // wait for keyboard dismissed
    activity?.supportFragmentManager?.popBackStack()
}

diousk

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    viewLifecycleOwner.lifecycleScope.launchWhenCreated {
        // before view laid out
        requireView().awaitLayout() // coroutine suspended
        // now view is laid out, we can get the size of view
    }
}

diousk

suspend fun View.awaitLayout() = suspendCancellableCoroutine<Unit>{ cont ->
    if (isLaidOut) {
        // if view is laid out, just resume coroutine
        cont.resume(Unit)
        return@suspendCancellableCoroutine
    }
    val listener = object : View.OnLayoutChangeListener {
        override fun onLayoutChange(
            view: View,
            left: Int,

diousk

suspend fun View.awaitLayout() = suspendCancellableCoroutine<Unit>{
    // use suspendCancellableCoroutine so that 
    // we can remove this listener when the job is cancelled
}

diousk

view.addOnLayoutChangeListener(object : View.OnLayoutChangeListener {
    override fun onLayoutChange(
        view: View,
        left: Int, top: Int, right: Int, bottom: Int,
        oldLeft: Int, oldTop: Int, oldRight: Int, oldBottom: Int
    ) {
        view.removeOnLayoutChangeListener(this)
        // now you can do something on the view
    }
})

diousk

class MainActivity : FragmentInjectActivity() {

    @Inject lateinit var vmFactory: ViewModelProvider.Factory
    private val viewModel by viewModels<MainViewModel> { vmFactory }

    @Inject lateinit var fragmentFactory: FragmentFactory

    override fun beforeOnCreate() {
        supportFragmentManager.fragmentFactory = fragmentFactory
    }

diousk

class DummyFragment @Inject constructor(
    private val repo: AppRepo
) : DaggerFragment() {
    // ...
}

diousk

public abstract class FragmentInjectActivity extends AppCompatActivity
        implements HasAndroidInjector {

    @Inject DispatchingAndroidInjector<Object> androidInjector;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        AndroidInjection.inject(this);
        beforeOnCreate(); // <-- expose here for child to do things before onCreate
        super.onCreate(savedInstanceState);

diousk

class MainActivity : DaggerAppCompatActivity() {

    @Inject lateinit var fragmentFactory: FragmentFactory

    override fun onCreate(savedInstanceState: Bundle?) {
        supportFragmentManager.fragmentFactory = fragmentFactory
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
}

diousk

@Module
abstract class DummyBuilder {
    @ContributesAndroidInjector(modules = [DummyModule::class])
    abstract fun bindDummygFragment(): DummyFragment

    // put binding of fragment at this layer(not DummyModule) for parent to inject
    @Binds
    @IntoMap
    @FragmentKey(DummyFragment::class)
    abstract fun bindDummyFragment(fragment: DummyFragment): Fragment