为什么等于总是在布局 xml（数据绑定）中返回 false？

Question

I'm working on this project https://developer.android.google.cn/codelabs/basic-android-kotlin-training-project-lunch-tray , and the final project is very similar to https://github.com/ErickPimentel/LunchTray , but I add android:checked to RadioButton , for example, @{viewModel.accompaniment.name.equals(@string/bread)} (I put all hard coded strings in string.xml ). But it does not work fine, it can't checked any radio button.

Answer 1

I check your AccompanimentMenuFragment android:checked="@{viewModel.accompaniment.name.equals(@string/pickles)}"

Here viewModel.accompaniment.name has value "Pickled Veggies" and in string "pickles".

viewModel.setAccompaniment(@string/pickles)}" is setting value from your DataSource which has name "Pickled Veggies".

_accompaniment.value = menuItems[accompaniment] in this line menuItems[accompaniment] is getting value from DataSource which has

"pickles" to MenuItem( name = "Pickled Veggies", description = "Pickled cucumbers and carrots, made in house", price = 0.50, type = ItemType.ACCOMPANIMENT )

Hence you "Pickled Veggies" is getting compared with "pickles" which gives false result. Same issue is with other fragments