databinding-samples | samples using the Android Data Binding Library
kandi X-RAY | databinding-samples Summary
kandi X-RAY | databinding-samples Summary
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QUESTION
The Code A and Code B are from the project https://github.com/android/databinding-samples.
The Code B display an icon based fun popularityIcon(view: ImageView, popularity: Popularity)
and works well.
I find that project can still work well even if I rename @BindingAdapter("app:popularityIcon")
to @BindingAdapter("myok:popularityIcon")
, just like Code C, why?
Code A
...ANSWER
Answered 2020-Jun-24 at 12:30you need to update your namespace in your XML were you using this binding. like below
QUESTION
The following code is from the project https://github.com/android/databinding-samples.git
What does ^map mean in Android Studio 4.0 ? It seems that I can't delete it and I can't hide it.
Code Image
...ANSWER
Answered 2020-Jul-02 at 05:16That is actually pointing that it is going to be returned to the lambda passed in the map
function.
By default the lambda name is same as the function you are calling (map
in this case), and by default the lambda returns the last expression that is when
in this case. So it will return it to the lambda. you can also explicitly specify that by return@map Popularity.STAR
as well.
You can also change the name of the lambda if that bothers you,
QUESTION
I know I can implement One-way data binding either Observable fields or LiveData.
1: The sample code implement Two-way data binding with Observable fields, can I implement Two-way data binding with LiveData? Is there a sample code written with Kotlin?
2: I have read the artical, it seems that I must implement BaseObservable
for Two-way data binding with Observable fields. Do I must implement BaseObservable
for Two-way data binding if I can use LiveData to implement Two-way data binding?
ANSWER
Answered 2020-Jun-25 at 03:00The first question's answer is Yes. You can use LiveData
in two-day data binding. I also used LiveData
in two-way data binding. This article helped me much.
The second question's answer is LiveData by itself is a lifecycle-aware Observable. So you don't need to implement BaseObservable
.
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