小编Shi*_*a s的帖子

一直试图解决这个问题但无法解决。这是 udacity 课程，我尝试使用挂起意图创建通知，但挂起意图可变存在问题，我尝试用这种方式

视图模型

private val REQUEST_CODE = 0
private val TRIGGER_TIME = "TRIGGER_AT"

private val minute: Long = 60_000L
private val second: Long = 1_000L

private val timerLengthOptions: IntArray
private val notifyPendingIntent: PendingIntent

private val alarmManager = app.getSystemService(Context.ALARM_SERVICE) as AlarmManager
private var prefs =
    app.getSharedPreferences("com.shivaConsulting.androidProjects.kotlinnotificatons", Context.MODE_PRIVATE)
private val notifyIntent = Intent(app, AlarmReciever::class.java)

private val _timeSelection = MutableLiveData<Int>()
val timeSelection: LiveData<Int>
    get() = _timeSelection

private val _elapsedTime = MutableLiveData<Long>()
val elapsedTime: LiveData<Long>
    get() = _elapsedTime

private var _alarmOn = MutableLiveData<Boolean>() …

mutablestate我有一个ViewModel正在尝试在可组合项中设置和访问的内容。当我使用委托属性时，remember它正在工作，但是在 viewModel 中创建它并在 compose 中访问它之后，变量的状态为空如何在 viewModel 中使用状态

当状态位于组合内部时，一切工作正常

var mSelectedText by remember { mutableStateOf("") }

但是当我从 viewModel 更改中使用它并设置我的 OutlinedTextField value = mainCatTitle 和 onValueChange = {mainCatTitle = it} 时，所选标题不会显示在 OutlinedTextField 中为空

 private val _mainCatTitle = mutableStateOf("")
 val mainCatTitle: State<String> = _mainCatTitle

我的可组合项

   var mSelectedText by remember { mutableStateOf("") }
   var mainCatTitle = viewModel.mainCatTitle.value

   Column(Modifier.padding(20.dp)) {

    OutlinedTextField(
        value = mainCatTitle,
        onValueChange = { mainCatTitle = it },
        modifier = Modifier
            .fillMaxWidth()
            .onGloballyPositioned { coordinates ->
                mTextFieldSize …

我有几个文本字段和按钮，用于打开底部抽屉。如何删除底部栏占用的空白空间我不想要空白空间，以便我的文本字段靠近我的按钮。我尝试使用修改器，但降低高度后，底部栏在屏幕中可见。是否可以删除多余的空间

我的屏幕

 Scaffold(scaffoldState = scaffoldState) {\n    Column(Modifier.padding(16.dp)) {\n\n        BottomDrawerSample()\n\n        OutlinedTextField(value = text,\n            onValueChange = { text = it },\n            label = { Text(text = "Title") },\n            singleLine = true)\n\n        OutlinedTextField(value = text,\n            onValueChange = { text = it },\n            label = { Text(text = "Brand") },\n            singleLine = true)\n     }\n   }\n

底部抽屉

@Composable\n@OptIn(ExperimentalMaterialApi::class)\nfun BottomDrawerSample() {\nval (gesturesEnabled, toggleGesturesEnabled) = remember { mutableStateOf(true) }\nval scope = rememberCoroutineScope()\nColumn {\n    Row(\n        modifier = Modifier\n            .fillMaxWidth()\n            .toggleable(\n                value = gesturesEnabled,\n                onValueChange …