Android：在 Android Studio 中无需更改 LiveData 即可自动更新视图

如何解决Android：在 Android Studio 中无需更改 LiveData 即可自动更新视图

（编辑：当我在从 setSavedAnimOnUi() 调用方法 activity 之前添加了延迟，该方法负责在启动时更新 visibility 的 ImageViews，它是现在工作正常。可能是什么原因？我在下面添加了 activity 代码段。）

我正在使用 LiveData 和自定义 BindingAdapter 来更新某些 ImageViews 的可见性。

问题是：当我最小化应用程序并返回时，ImageView 会自动更新，即使 livedata 没有改变。

为什么会这样？有人可以帮我吗？

这是我的代码片段：

Activity.kt

   settingsViewModel.readAnimationFromDataStore.observe(this,{
        if (!isAnimPaused) {   // stopping update when onResume gets called
            Handler().postDelayed({   // This is making things work as expected
                settingsViewModel.setSavedAnimOnUi(it)
            },1000)
    })

ViewModel.kt

private val _stateAnim1 = MutableLiveData<Boolean>()
val stateAnim1: LiveData<Boolean> = _stateAnim1

private val _stateAnim2 = MutableLiveData<Boolean>()
val stateAnim2: LiveData<Boolean> = _stateAnim2

private val _stateAnim3 = MutableLiveData<Boolean>()
val stateAnim3: LiveData<Boolean> = _stateAnim3

private val _stateAnim4 = MutableLiveData<Boolean>()
val stateAnim4: LiveData<Boolean> = _stateAnim4

private val _stateAnim5 = MutableLiveData<Boolean>()
val stateAnim5: LiveData<Boolean> = _stateAnim5

fun setSavedAnimOnUi(anim: Int) {

    when (anim) {
        1 -> _stateAnim1.value = true
            
        2 -> _stateAnim2.value = true
            
        3 -> _stateAnim3.value = true
           
        4 -> _stateAnim4.value = true

        5 -> _stateAnim5.value = true
    }
}

BindingAdapter.kt

@BindingAdapter("checkMarkVisibility")
fun checkMarkVisibility(view: ImageView,state: Boolean) {

// this log statement is used for getting the logs i have provided below
Log.d("BINDING_ADAPTER","checkMarkVisibility: called. view=$view,state=$state")
if (state)
   view.visibility = View.VISIBLE
else
   view.visibility = View.GONE
}

layout.xml

<ImageView
            android:id="@+id/check_anim1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:scaleType="centerInside"
            app:checkMarkVisibility="@{viewmodel.stateAnim1}"   // tied with the BindingAdapter
            android:src="@drawable/ic_selected" />

<ImageView
            android:id="@+id/check_anim2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:scaleType="centerInside"
            app:checkMarkVisibility="@{viewmodel.stateAnim2}"  // tied with the BindingAdapter
            android:src="@drawable/ic_selected" />

<ImageView
            android:id="@+id/check_anim5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:scaleType="centerInside"
            app:checkMarkVisibility="@{viewmodel.stateAnim5}"  // tied with the BindingAdapter
            android:src="@drawable/ic_selected" />