Use addLinks method on message. Next step is to proceed the url to navigate.

app/src/main/java/im/vector/riotredesign/features/home/room/detail/RoomDetailFragment.kt

@@ -23,8 +23,9 @@ import im.vector.riotredesign.features.home.room.detail.timeline.TimelineEventCo
 import kotlinx.android.synthetic.main.fragment_room_detail.*
 import org.koin.android.ext.android.inject
 import org.koin.core.parameter.parametersOf
+import timber.log.Timber
 
-class RoomDetailFragment : RiotFragment() {
+class RoomDetailFragment : RiotFragment(), TimelineEventController.Callback {
 
     companion object {
 
@@ -80,6 +81,7 @@ class RoomDetailFragment : RiotFragment() {
         recyclerView.layoutManager = layoutManager
         timelineEventController.addModelBuildListener { it.dispatchTo(scrollOnNewMessageCallback) }
         recyclerView.setController(timelineEventController)
+        timelineEventController.callback = this
     }
 
     private fun renderRoomSummary(roomSummary: RoomSummary?) {
@@ -100,4 +102,10 @@ class RoomDetailFragment : RiotFragment() {
         timelineEventController.timeline = events
     }
 
+    // TimelineEventController.Callback ************************************************************
+
+    override fun onUrlClicked(url: String) {
+        Timber.v("Url clicked: $url")
+    }
+
 }

app/src/main/java/im/vector/riotredesign/features/home/room/detail/timeline/MessageItem.kt

@@ -3,6 +3,8 @@ package im.vector.riotredesign.features.home.room.detail.timeline
 import android.view.View
 import android.widget.ImageView
 import android.widget.TextView
+import im.vector.matrix.android.api.permalinks.MatrixURLSpan
+import im.vector.matrix.android.api.permalinks.MatrixUrlLinkify
 import im.vector.riotredesign.R
 import im.vector.riotredesign.core.epoxy.KotlinModel
 import im.vector.riotredesign.features.home.AvatarRenderer
@@ -12,7 +14,8 @@ data class MessageItem(
         val time: CharSequence? = null,
         val avatarUrl: String?,
         val memberName: CharSequence? = null,
-        val showInformation: Boolean = true
+        val showInformation: Boolean = true,
+        val onUrlClickedListener: ((url: String) -> Unit)? = null
 ) : KotlinModel(R.layout.item_event_message) {
 
     private val avatarImageView by bind<ImageView>(R.id.messageAvatarImageView)
@@ -22,6 +25,11 @@ data class MessageItem(
 
     override fun bind() {
         messageView.text = message
+        MatrixUrlLinkify.addLinks(messageView, object : MatrixURLSpan.Callback {
+            override fun onUrlClicked(url: String) {
+                onUrlClickedListener?.invoke(url)
+            }
+        })
         if (showInformation) {
             avatarImageView.visibility = View.VISIBLE
             memberNameView.visibility = View.VISIBLE

app/src/main/java/im/vector/riotredesign/features/home/room/detail/timeline/MessageItemFactory.kt

@@ -9,7 +9,13 @@ class MessageItemFactory(private val timelineDateFormatter: TimelineDateFormatte
 
     private val messagesDisplayedWithInformation = HashSet<String?>()
 
-    fun create(event: EnrichedEvent, nextEvent: EnrichedEvent?, addDaySeparator: Boolean, date: LocalDateTime): MessageItem? {
+    fun create(event: EnrichedEvent,
+               nextEvent: EnrichedEvent?,
+               addDaySeparator: Boolean,
+               date: LocalDateTime,
+               callback: TimelineEventController.Callback?
+    ): MessageItem? {
+
         val messageContent: MessageContent? = event.root.content.toModel()
         val roomMember = event.roomMember
         if (messageContent == null || roomMember == null) {
@@ -20,13 +26,13 @@ class MessageItemFactory(private val timelineDateFormatter: TimelineDateFormatte
             messagesDisplayedWithInformation.add(event.root.eventId)
         }
         val showInformation = messagesDisplayedWithInformation.contains(event.root.eventId)
-
         return MessageItem(
                 message = messageContent.body,
                 avatarUrl = roomMember.avatarUrl,
                 showInformation = showInformation,
                 time = timelineDateFormatter.formatMessageHour(date),
-                memberName = roomMember.displayName ?: event.root.sender
+                memberName = roomMember.displayName ?: event.root.sender,
+                onUrlClickedListener = { callback?.onUrlClicked(it) }
         )
     }
 

app/src/main/java/im/vector/riotredesign/features/home/room/detail/timeline/TimelineEventController.kt

@@ -44,6 +44,8 @@ class TimelineEventController(private val roomId: String,
             buildSnapshotList()
         }
 
+    var callback: Callback? = null
+
     override fun buildModels() {
         buildModels(snapshotList)
     }
@@ -61,8 +63,8 @@ class TimelineEventController(private val roomId: String,
             val addDaySeparator = date.toLocalDate() != nextDate?.toLocalDate()
 
             val item = when (event.root.type) {
-                EventType.MESSAGE -> messageItemFactory.create(event, nextEvent, addDaySeparator, date)
-                else              -> textItemFactory.create(event)
+                EventType.MESSAGE -> messageItemFactory.create(event, nextEvent, addDaySeparator, date, callback)
+                else -> textItemFactory.create(event)
             }
             item
                     ?.onBind { timeline?.loadAround(index) }
@@ -87,4 +89,8 @@ class TimelineEventController(private val roomId: String,
         requestModelBuild()
     }
 
+    interface Callback {
+        fun onUrlClicked(url: String)
+    }
+
 }

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/permalinks/MatrixUrlLinkify.kt

@@ -1,34 +1,69 @@
 package im.vector.matrix.android.api.permalinks
 
 import android.text.Spannable
-import android.text.SpannableStringBuilder
+import android.text.SpannableString
+import android.text.method.LinkMovementMethod
+import android.widget.TextView
 
 object MatrixUrlLinkify {
 
     /**
      * Find the matrix spans i.e matrix id , user id ... to display them as URL.
      *
-     * @param spannableStringBuilder the text in which the matrix items has to be clickable.
+     * @param spannable the text in which the matrix items has to be clickable.
      */
-    fun addLinks(spannableStringBuilder: SpannableStringBuilder, callback: MatrixURLSpan.Callback?) {
+    fun addLinks(spannable: Spannable?, callback: MatrixURLSpan.Callback?): Boolean {
         // sanity checks
-        if (spannableStringBuilder.isEmpty()) {
-            return
+        if (spannable.isNullOrEmpty()) {
+            return false
         }
-        val text = spannableStringBuilder.toString()
+        val text = spannable.toString()
+        var hasMatch = false
         for (index in MatrixPatterns.MATRIX_PATTERNS.indices) {
             val pattern = MatrixPatterns.MATRIX_PATTERNS[index]
-            val matcher = pattern.matcher(spannableStringBuilder)
+            val matcher = pattern.matcher(spannable)
             while (matcher.find()) {
+                hasMatch = true
                 val startPos = matcher.start(0)
                 if (startPos == 0 || text[startPos - 1] != '/') {
                     val endPos = matcher.end(0)
                     val url = text.substring(matcher.start(0), matcher.end(0))
                     val span = MatrixURLSpan(url, callback)
-                    spannableStringBuilder.setSpan(span, startPos, endPos, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
+                    spannable.setSpan(span, startPos, endPos, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
                 }
             }
         }
+        return hasMatch
+    }
+
+    fun addLinks(textView: TextView, callback: MatrixURLSpan.Callback?): Boolean {
+        val text = textView.text
+        if (text is Spannable) {
+            if (addLinks(text, callback)) {
+                addLinkMovementMethod(textView)
+                return true
+            }
+
+            return false
+        } else {
+            val spannableString = SpannableString.valueOf(text)
+            if (addLinks(spannableString, callback)) {
+                addLinkMovementMethod(textView)
+                textView.text = spannableString
+                return true
+            }
+            return false
+        }
+    }
+
+
+    private fun addLinkMovementMethod(textView: TextView) {
+        val movementMethod = textView.movementMethod
+        if (movementMethod == null || movementMethod !is LinkMovementMethod) {
+            if (textView.linksClickable) {
+                textView.movementMethod = LinkMovementMethod.getInstance()
+            }
+        }
     }