Android Livedata和JetPack组成：实时数据未更新时

Question

固定在Livedata之后，观察者中的setContent并未被执行。所以我只是在空白的活动。这是怎么回事？它似乎在另一个具有类似模式的活动中起作用。

class TeamBuilderActivity : ComponentActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    
    val imageIds = listOf(
        R.mipmap.goblin_smiling_background,
        R.mipmap.marker_goblin_axe_foreground,
        R.mipmap.beholder_foreground,
        R.mipmap.d20_background,
        R.mipmap.marker_goblin_axe_foreground,
        R.mipmap.goblin_smiling_foreground
    )

    val monsters = listOf(
        GoblinoidFactory.Bugbear(), GoblinoidFactory.Goblin(), KoboldFactory.Kobold()
    )
    val viewModel = ViewModelProvider(this).get(TeamBuilderActivityViewModel::class.java)
    val liveData = viewModel.getLiveData()

    liveData.observe(this, Observer {  
        setContent {
            Column {
                Card {

                    Column(Modifier.padding(5.dp)) {
                        TeamBuilderComposables.ImageSlider(
                            imageIds = imageIds,
                            onClicked = viewModel::onClickImage
                        )

                        TeamBuilderComposables.RandomNameRoller(
                            inputStream = resources.openRawResource(R.raw.nicknames),
                            onClicked = viewModel::setName
                        )

                        TeamBuilderComposables.StatBlockChooser(
                            monsters = monsters,
                            onClicked = viewModel::onClickMonsterStatBlock
                        )
                    }
                }

                TeamBuilderComposables.CharacterInfo(
                    imageId = it.selectedImageId,
                    monster = it.selectedMonster,
                    name = it.selectedName
                )
            }
        }
    })
}

}

Answer 1

好的……我发现处理此问题的最佳方法是将实时数据转换为组合块内部的状态对象：

val viewState = liveData.observeAsState()