added copy button in RollCall QR Token fragment

docs/messageData.md

@@ -3364,6 +3364,7 @@ This message is sent by both organizers to their servers to be broadcast. The me
 
 ```json5
 // ../protocol/examples/messageData/federation_tokens_exchange/federation_tokens_exchange.json
+
 {
   "object": "federation",
   "action": "tokens_exchange",
@@ -3372,11 +3373,13 @@ This message is sent by both organizers to their servers to be broadcast. The me
   "tokens": ["M5ZychEi5rwm22FjwjNuljL1qMJWD2sE7oX9fcHNMDU="],
   "timestamp": 1712854874
 }
+
 ```
 </details>
 
 ```json5
 // ../protocol/query/method/message/data/dataFederationTokensExchange.json
+
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
   "$id": "https://raw.githubusercontent.com/dedis/popstellar/master/protocol/query/method/message/data/dataFederationTokensExchange.json",

fe2-android/app/src/main/java/com/github/dedis/popstellar/ui/lao/event/rollcall/RollCallFragment.kt

@@ -30,6 +30,7 @@ import com.github.dedis.popstellar.utility.ActivityUtils.getQRCodeColor
 import com.github.dedis.popstellar.utility.ActivityUtils.handleExpandArrow
 import com.github.dedis.popstellar.utility.Constants.ID_NULL
 import com.github.dedis.popstellar.utility.Constants.ROLL_CALL_ID
+import com.github.dedis.popstellar.utility.UIUtils
 import com.github.dedis.popstellar.utility.error.ErrorUtils.logAndShow
 import com.github.dedis.popstellar.utility.error.UnknownLaoException
 import com.github.dedis.popstellar.utility.error.UnknownRollCallException
@@ -55,6 +56,8 @@ class RollCallFragment : AbstractEventFragment {
 
   private val deAnonymizationWarned = MutableLiveData(false)
 
+  private lateinit var clipboardManager: UIUtils.ClipboardUtil
+
   constructor()
 
   override fun onCreateView(
@@ -67,7 +70,7 @@ class RollCallFragment : AbstractEventFragment {
 
     laoViewModel = obtainViewModel(requireActivity())
     rollCallViewModel = obtainRollCallViewModel(requireActivity(), laoViewModel.laoId)
-
+    clipboardManager = UIUtils.ClipboardUtil(requireActivity())
     rollCall =
         try {
           rollCallRepo.getRollCallWithPersistentId(
@@ -147,6 +150,9 @@ class RollCallFragment : AbstractEventFragment {
 
     handleBackNav(TAG)
 
+    clipboardManager.setupCopyButton(
+        binding.rollCallPopTokenTextCopyButton, binding.rollCallPopTokenText, "PoP Token Hash")
+
     return binding.root
   }
 

fe2-android/app/src/main/res/layout/roll_call_fragment.xml

@@ -74,13 +74,33 @@
       app:layout_constraintStart_toStartOf="parent"
       app:layout_constraintTop_toBottomOf="@+id/roll_call_end_time" />
 
-    <TextView
-      android:id="@+id/roll_call_pop_token_text"
+    <LinearLayout
+      android:id="@+id/lao_properties_identifier_container"
       android:layout_width="wrap_content"
-      android:layout_height="0dp"
-      app:layout_constraintEnd_toEndOf="parent"
+      android:layout_height="wrap_content"
+      android:orientation="horizontal"
       app:layout_constraintStart_toStartOf="parent"
-      app:layout_constraintTop_toBottomOf="@+id/roll_call_pk_qr_code" />
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintTop_toBottomOf="@id/roll_call_pk_qr_code">
+
+      <TextView
+        android:id="@+id/roll_call_pop_token_text"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textIsSelectable="true"
+        app:layout_constraintTop_toBottomOf="@+id/roll_call_pk_qr_code" />
+
+      <ImageButton
+        android:id="@+id/roll_call_pop_token_text_copy_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:srcCompat="@drawable/ic_content_copy"
+        android:layout_gravity="bottom"
+        android:contentDescription="@string/copy_to_clipboard_lao_id"
+        android:background="?android:attr/selectableItemBackgroundBorderless"
+        android:layout_marginStart="8dp"/>
+    </LinearLayout>
+
 
     <TextView
       android:id="@+id/roll_call_fragment_title"

fe2-android/app/src/test/framework/common/java/com/github/dedis/popstellar/testutils/pages/lao/event/rollcall/RollCallFragmentPageObject.java

@@ -53,6 +53,10 @@ public static ViewInteraction rollCallPopTokenText() {
     return onView(withId(R.id.roll_call_pop_token_text));
   }
 
+    public static ViewInteraction rollCallPopTokenTextCopyButton() {
+        return onView(withId(R.id.roll_call_pop_token_text_copy_button));
+    }
+
   public static ViewInteraction rollCallLocationCard() {
     return onView(withId(R.id.roll_call_location_card));
   }

fe2-android/app/src/test/ui/robolectric/com/github/dedis/popstellar/ui/lao/event/rollcall/RollCallFragmentTest.kt

@@ -1,5 +1,7 @@
 package com.github.dedis.popstellar.ui.lao.event.rollcall
 
+import android.content.ClipboardManager
+import android.content.Context
 import androidx.arch.core.executor.testing.InstantTaskExecutorRule
 import androidx.test.espresso.action.ViewActions
 import androidx.test.espresso.assertion.ViewAssertions
@@ -36,6 +38,7 @@ import dagger.hilt.android.testing.BindValue
 import dagger.hilt.android.testing.HiltAndroidRule
 import dagger.hilt.android.testing.HiltAndroidTest
 import io.reactivex.subjects.BehaviorSubject
+import junit.framework.TestCase
 import org.junit.Assert
 import org.junit.Rule
 import org.junit.Test
@@ -558,6 +561,23 @@ class RollCallFragmentTest {
     UITestUtils.assertToastIsDisplayedWithText(R.string.roll_call_attendees_list_not_sorted)
   }
 
+  @Test
+  fun copyTokenButtonCopiesCorrectText() {
+
+    fakeClientLao()
+    rollCallRepo.updateRollCall(LAO_ID, openRollCall(ROLL_CALL))
+    RollCallFragmentPageObject.rollCallPopTokenTextCopyButton().perform(ViewActions.click())
+
+    val clipboard = InstrumentationRegistry.getInstrumentation().targetContext.getSystemService(
+      Context.CLIPBOARD_SERVICE) as ClipboardManager
+    TestCase.assertTrue(clipboard.hasPrimaryClip())
+    val clipData = clipboard.primaryClip
+    TestCase.assertNotNull(clipData)
+    val copiedText = clipData!!.getItemAt(0).text.toString()
+    RollCallFragmentPageObject.rollCallPopTokenText().check(ViewAssertions.matches(ViewMatchers.withText(copiedText)))
+
+  }
+
   /** Utility function to create a LAO when the user is not the organizer */
   @Throws(UnknownLaoException::class)
   private fun fakeClientLao() {