在窗口管理器不起作用的情况下撰写 UI（重构）

Question

我正在 Android 上开发浮动窗口，但遇到了问题。 因此，我的活动调用我的浮动类，该类创建视图并将其添加到窗口管理器，并带有显示并倒计时的计时器。在正常活动中尝试相同的代码时，它可以找到：S？

这是我的视图模型，保存着我的 mutableStateOf 值

class WicViewModel : ViewModel() {

private val TAG = "WicViewModel"

private val a = 10000L
private val b = 1000L

private var _input: Long by mutableStateOf(a)

var input: Long
    get() = _input
    set(value) {
        if (value == _input) return
        _input = value

    }


fun start() {
    val timer = object : CountDownTimer(a, b) {
        override fun onTick(millisUntilFinished: Long) {
            Log.d("MYLOG", "text updated programmatically")
            input = millisUntilFinished

        }

        override fun onFinish() {
            input = 0
        }
    }
    timer.start()

}
}

这是我的课程，其中包含窗口管理器

class WicController constructor(val context: Context?, val viewModel: WicViewModel) {

private val TAG = "WicController"
private var windowManager: WindowManager? = null
private var wicView: View? = null
private lateinit var lifecycleOwner: CDOLifecycleOwner


fun show() {
    if (context == null) return
    val paramFloat = WindowManager.LayoutParams(
        WindowManager.LayoutParams.WRAP_CONTENT,
        WindowManager.LayoutParams.WRAP_CONTENT,
        getWindowType(),
        WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
        PixelFormat.TRANSLUCENT
    )
    paramFloat.gravity = Gravity.CENTER or Gravity.END

    windowManager = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager?


    val composeView = ComposeView(context.applicationContext)
    composeView.setContent {
        timerText(viewModel)
    }

    lifecycleOwner = CDOLifecycleOwner()
    lifecycleOwner.performRestore(null)
    lifecycleOwner.handleLifecycleEvent(Lifecycle.Event.ON_CREATE)
    ViewTreeLifecycleOwner.set(composeView, lifecycleOwner)
    ViewTreeSavedStateRegistryOwner.set(composeView, lifecycleOwner)
    windowManager?.addView(composeView, paramFloat)

}

fun hide() {
    windowManager?.removeView(wicView!!)
    context?.let { Demo.startCalldorado(it) }
}

private fun getWindowType(): Int {
    var windowType = WindowManager.LayoutParams.TYPE_SYSTEM_ERROR
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        windowType = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY
    }
    return windowType
}


@Composable
fun timerText(viewModel: WicViewModel){
    Text(
        text = (viewModel.input / 1000).toString(),
        modifier = Modifier
            .padding(bottom = 8.dp)
            .fillMaxWidth(),
        fontSize = 13.sp,
        color = Color.White,

        )
}}

我知道值正在改变，但组合并没有重新组合本身 有时它可能会改变，但非常随机。

我不知道我是否做错了，或者 compose 是否不是为窗口管理器/浮动窗口使用而设计的，但是我希望这里的一些人可以帮助我，因为我在网上找不到任何关于此的信息。

Answer 1

Jetpack Compose，使用自定义 Lifecycle/ViewModelStore/SavedStateRegistry Owner 时不会触发重组

这个答案会对你有帮助。

val viewModelStore = ViewModelStore()
lifecycleOwner.performRestore(null)
lifecycleOwner.handleLifecycleEvent(Lifecycle.Event.ON_CREATE)
lifecycleOwner.handleLifecycleEvent(Lifecycle.Event.ON_START)
ViewTreeLifecycleOwner.set(composeView, lifecycleOwner)
ViewTreeViewModelStoreOwner.set(composeView) { viewModelStore }
it.setViewTreeSavedStateRegistryOwner(lifecycleOwner)