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当我在模拟器上运行应用程序时它工作正常但它立即在我的手机上打开和关闭并得到这个

W/Looper: Slow Looper main: Long Msg: seq=7 plan=13:35:52.606  late=267ms wall=1940ms running=0ms h=android.view.Choreographer$FrameHandler c=android.view.Choreographer$FrameDisplayEventReceiver
I/Choreographer: Skipped 220 frames!  The application may be doing too much work on its main thread.
W/Looper: Slow Looper main: doFrame is 1834ms late because of 4 msg, msg 1 took 1940ms (seq=7 late=267ms h=android.view.Choreographer$FrameHandler c=android.view.Choreographer$FrameDisplayEventReceiver), msg 4 took 81ms (seq=10 late=1757ms h=android.os.Handler c=androidx.compose.ui.platform.AndroidUiDispatcher$dispatchCallback$1)
I/Process: Sending signal. PID: 28010 SIG: 9

它工作正常，我不知道发生了什么，但我确定房间里的问题

到

@Dao
interface WordDao {
    @Query("SELECT * FROM vocabulary_table ORDER BY last_revision ASC")
    fun get(): Flow<List<Vocabulary>>
}

存储库

class VocabularyRepository(private val wordDao: WordDao) {
    val allVocabulary = wordDao.get()
}

视图模型

class HomeViewModel(application: Application):AndroidViewModel(application) {



    private val vocabularyRepository = getApplication<WordApplication>().vocabularyRepository
    val allVocabulary = vocabularyRepository.allVocabulary


}

撰写功能

@Composable
fun HomeScreen(
    onNavigateToForm:() -> Unit,
    onNavigateToReview:() -> Unit,
    onNavigateToSettings:() -> Unit,
    onNavigateToRecall:(id:Long) -> Unit
){
    val homeViewModel:HomeViewModel = viewModel()


    val allVocabulary = homeViewModel.allVocabulary.collectAsState(initial = emptyList())
    Text(allVocabulary.value.size.toString())

}
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1 回答 1

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在您的 ViewModel 中，您可以利用 viewModelScope 并将任务安排在 IO 线程上，以减少 mainThread 的工作量。

fun retreiveData(){
 viewModelScope.launch(Dispatchers.IO){
   // retreive data here
 }
}

此外，您可以利用Profiler来检测您的主线程是如何被利用的，然后对其采取行动。查看 Profiler 的选项位于 Logcat 旁边。只需按下探查器图标（除了调试器图标）来运行您的应用程序，然后在探查器部分中观察您的主线程是如何被过度使用的。

于 2021-09-18T12:42:27.420 回答