android-jetpack-compose

来源： https://stackoverflow.com/questions/59277354/jetpack-compose-breaks-room-compiler

来源： https://stackoverflow.com/questions/63549229/why-jetpack-compose-preview-shows-nothing

来源： https://stackoverflow.com/questions/63549229/why-jetpack-compose-preview-shows-nothing

来源： https://stackoverflow.com/questions/63549229/why-jetpack-compose-preview-shows-nothing

来源： https://stackoverflow.com/questions/63549229/why-jetpack-compose-preview-shows-nothing

问题 In Jetpack Compose, how can I display a large list of data while laying out only the visible items, instead of composing and laying out every item on the initial layout pass? This would be similar to RecyclerView and ListView in the View toolkit. One could use a for loop to place all of the components inside of a Column in a VerticalScroller , but this would result in dropped frames and poor performance on larger numbers of items. Note: this is intended as a canonical self-answered question

问题 In Jetpack Compose, how can I display a large list of data while laying out only the visible items, instead of composing and laying out every item on the initial layout pass? This would be similar to RecyclerView and ListView in the View toolkit. One could use a for loop to place all of the components inside of a Column in a VerticalScroller , but this would result in dropped frames and poor performance on larger numbers of items. Note: this is intended as a canonical self-answered question

问题 fun createListItem(itemIndex: Int) { Padding(left = 8.dp, right = 8.dp, top = 8.dp, bottom = 8.dp) { FlexRow(crossAxisAlignment = CrossAxisAlignment.Center) { expanded(1.0f) { Text("Item $itemIndex") } inflexible { Button( "Button $itemIndex", style = ContainedButtonStyle(), onClick = { Toast.makeText( this@MainActivity, "Item name $itemIndex", Toast.LENGTH_SHORT ).show() }) } } } } I try to make Toast in a normal way. but I got the error I tried a lot of multiples source but failed. 回答1: You

问题 fun createListItem(itemIndex: Int) { Padding(left = 8.dp, right = 8.dp, top = 8.dp, bottom = 8.dp) { FlexRow(crossAxisAlignment = CrossAxisAlignment.Center) { expanded(1.0f) { Text("Item $itemIndex") } inflexible { Button( "Button $itemIndex", style = ContainedButtonStyle(), onClick = { Toast.makeText( this@MainActivity, "Item name $itemIndex", Toast.LENGTH_SHORT ).show() }) } } } } I try to make Toast in a normal way. but I got the error I tried a lot of multiples source but failed. 回答1: You

问题 I'm trying call DrawImage() on my code, I'm following this tutorial Jetpack Tutorial, But I'm getting this error.: Unresolved reference: DrawImage I tried implement on build.gradle, this lib.: implementation 'androidx.ui:ui-foundation:0.1.0-dev04' But I getting this error.: Executing tasks: [clean, :app:assembleDebug] in project C:\Users\samue\Desktop\Projetos Kotlin\first-jetpack Task :clean Task :app:clean Task :app:preBuild UP-TO-DATE Task :app:preDebugBuild UP-TO-DATE Task :app