How to use Android LifecycleOwner in dialog

Question

I want to use mvvm in Dialog but I don't know how to pass LifecycleOwner to observe

class CommonDialog(context: Context) : Dialog(context, R.style.AppMaskStatusTheme) {

    private val viewBinding: DialogSportOrderBinding by lazy { DialogSportOrderBinding.inflate(LayoutInflater.from(context)) }
    private val viewModel by lazy { ViewModelProvider(context as ViewModelStoreOwner)[SportOrderViewModel::class.java] }

 init {
        setContentView(viewBinding.root)

        viewModel.sportOrderList.observe(***what to pass here?***, androidx.lifecycle.Observer {

        })
    }
}

I have tried context as LifecycleOwner, context as AppCompatActivity but all fail

please help me, thanks!

score 3 · Accepted Answer · answered Dec 27 '21 at 09:02

You can create your own LifecycleOwner like this

class MyLifecycleOwner() : LifecycleOwner {
    private val mLifecycleRegistry: LifecycleRegistry by lazy { LifecycleRegistry(this) }

    init {
        mLifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_START)
    }

    fun stop() {
        mLifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_STOP)
    }

    fun start() {
        mLifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_START)
    }

    override fun getLifecycle(): Lifecycle = mLifecycleRegistry
}

Then your Dialog class will be like this

class CommonDialog(context: Context) : Dialog(context, R.style.AppMaskStatusTheme) {

    private val viewBinding: DialogSportOrderBinding by lazy { DialogSportOrderBinding.inflate(LayoutInflater.from(context)) }
    private val viewModel by lazy { ViewModelProvider(context as ViewModelStoreOwner)[SportOrderViewModel::class.java] }

    private val lifeCycleOwner: MyLifecycleOwner by lazy { MyLifecycleOwner() }

    init {
        setContentView(viewBinding.root)

        viewModel.sportOrderList.observe(lifeCycleOwner, {

        })
    }

    override fun onStart() {
        super.onStart()
        lifeCycleOwner.start()
    }

    override fun onStop() {
        super.onStop()
        lifeCycleOwner.stop()
    }
}

Read more about Lifecycle-Aware Components at here

That is what i need. Thank for help. It works. Appreciate – GHH Dec 28 '21 at 01:35 — GHH, Dec 28 '21 at 01:35

score 0 · Answer 2 · answered Dec 27 '21 at 08:15

0

android.content.Context does not implement android.arch.lifecycle.LifecycleOwner.

You'd have to pass an instance of AppCompatActivity, which implements android.arch.lifecycle.LifecycleOwner (or any other class which does that).

or cast (AppCompatActivity) context, when context is an instanceof AppCompatActivity.

answered Dec 27 '21 at 08:15

faizy

504
5
17

I tried to pass `context as AppCompatActivity` but app will crash – GHH Dec 27 '21 at 08:22
Did you tried DialogFragment ? – faizy Dec 27 '21 at 08:28
DialogFragment is ok, but that is different from Dialog.I just want to use dialog – GHH Dec 27 '21 at 08:35

How to use Android LifecycleOwner in dialog

2 Answers2