Updated on 2026-08-14

tangem-demo/src/main/java/com/tangem/tangemtest/ucase/ui/BaseCardActionFragment.kt

@@ -36,6 +36,7 @@ abstract class BaseCardActionFragment : Fragment(), LayoutHolder {
     }
     protected val viewModel: ParamsViewModel by viewModels { ActionViewModelFactory(itemsManager) }
     protected lateinit var mainView: View
+    protected val widgetList = mutableListOf<ParameterWidget>()
 
     private val itemsManager: ItemsManager by lazy { ParamsManagerFactory.createFactory().get(getAction())!! }
 
@@ -51,7 +52,7 @@ abstract class BaseCardActionFragment : Fragment(), LayoutHolder {
 
         viewModel.setCardManager(CardManager.init(requireActivity()))
         initFab()
-        createWidgets { subscribeToViewModelChanges(it) }
+        createWidgets { subscribeToViewModelChanges() }
     }
 
     private fun initFab() {
@@ -59,29 +60,40 @@ abstract class BaseCardActionFragment : Fragment(), LayoutHolder {
         mainView.find<FloatingActionButton>(R.id.fab_action)?.setOnClickListener { viewModel.invokeMainAction() }
     }
 
-    private fun createWidgets(callback: (List<ParameterWidget>) -> Unit) {
+    private fun createWidgets(widgetCreatedCallback: () -> Unit) {
         Log.d(this, "createWidgets")
         viewModel.ldParams.observe(viewLifecycleOwner, Observer { itemList ->
-            val widgetList = mutableListOf<ParameterWidget>()
             itemList.forEach { param ->
                 val widget = ParameterWidget(inflateParamView(incomingParamsContainer), param)
                 widget.onValueChanged = { id, value -> viewModel.userChangedItem(id, value) }
                 widget.onActionBtnClickListener = viewModel.getItemAction(param.id)
                 widgetList.add(widget)
             }
-            callback(widgetList)
+            widgetCreatedCallback()
         })
     }
 
-    private fun subscribeToViewModelChanges(widgetList: List<ParameterWidget>) {
+    private fun subscribeToViewModelChanges() {
         Log.d(this, "subscribeToViewModelChanges")
+        listenResponse()
+        listenError()
+        listenChangedItems()
+        listenDescriptionSwitchChanges()
+    }
 
+    protected open fun listenResponse() {
         val tvResponse by lazy { mainView.findViewById<TextView>(R.id.tv_action_response_json) }
         viewModel.ldResponse.observe(viewLifecycleOwner, Observer {
             Log.d(this, "action response: ${if (it.length > 50) it.substring(0..50) else it}")
             tvResponse.text = it
         })
+    }
+
+    protected open fun listenError() {
         viewModel.seError.observe(viewLifecycleOwner, Observer { showSnackbarMessage(it) })
+    }
+
+    protected open fun listenChangedItems() {
         viewModel.seChangedItems.observe(viewLifecycleOwner, Observer { itemList ->
             itemList.forEach { item ->
                 Log.d(this, "item changed from VM - name: ${item.id}")
@@ -90,6 +102,9 @@ abstract class BaseCardActionFragment : Fragment(), LayoutHolder {
                 widgetList.firstOrNull { it.id == item.id }?.changeParamValue(item.viewModel.data)
             }
         })
+    }
+
+    protected open fun listenDescriptionSwitchChanges() {
         val mainActViewModel by activityViewModels<MainViewModel>()
         mainActViewModel.ldDescriptionSwitch.observe(viewLifecycleOwner, Observer { isEnabled ->
             widgetList.forEach { it.toggleDescriptionVisibility(isEnabled) }

tangem-demo/src/main/java/com/tangem/tangemtest/ucase/variants/scan/ui/ScanActionFragment.kt

@@ -1,8 +1,12 @@
 package com.tangem.tangemtest.ucase.variants.scan.ui
 
+import android.widget.TextView
+import androidx.lifecycle.Observer
 import com.tangem.tangemtest.R
 import com.tangem.tangemtest.ucase.resources.ActionType
 import com.tangem.tangemtest.ucase.ui.BaseCardActionFragment
+import ru.dev.gbixahue.eu4d.lib.android._android.views.show
+import ru.dev.gbixahue.eu4d.lib.android.global.log.Log
 
 /**
 [REDACTED_AUTHOR]
@@ -12,4 +16,14 @@ class ScanActionFragment : BaseCardActionFragment() {
     override fun getLayoutId(): Int = R.layout.fg_action_card_scan
 
     override fun getAction(): ActionType = ActionType.Scan
+
+    override fun listenResponse() {
+        val tvStub = mainView.findViewById<TextView>(R.id.tv_screen_stub)
+        val tvResponse by lazy { mainView.findViewById<TextView>(R.id.tv_action_response_json) }
+        viewModel.ldResponse.observe(viewLifecycleOwner, Observer {
+            Log.d(this, "action response: ${if (it.length > 50) it.substring(0..50) else it}")
+            tvStub.show(false)
+            tvResponse.text = it
+        })
+    }
 }

tangem-demo/src/main/res/layout/fg_action_card_scan.xml

@@ -29,6 +29,7 @@
     </ScrollView>
 
     <TextView
+        android:id="@+id/tv_screen_stub"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center"