Support spoilers in messages

CHANGES.md

@@ -7,6 +7,7 @@ Features ✨:
 Improvements 🙌:
  - Search reaction by name or keyword in emoji picker
  - Handle code tags (#567)
+ - Support spoiler messages
 
 Other changes:
  - Markdown set to off by default (#412)

vector/src/main/java/im/vector/riotx/features/home/room/detail/timeline/item/MessageTextItem.kt

@@ -31,6 +31,7 @@ import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import me.saket.bettermovementmethod.BetterLinkMovementMethod
+import java.net.URL
 
 @EpoxyModelClass(layout = R.layout.item_timeline_event_base)
 abstract class MessageTextItem : AbsMessageItem<MessageTextItem.Holder>() {
@@ -49,15 +50,25 @@ abstract class MessageTextItem : AbsMessageItem<MessageTextItem.Holder>() {
     private val mvmtMethod = BetterLinkMovementMethod.newInstance().also {
         it.setOnLinkClickListener { _, url ->
             // Return false to let android manage the click on the link, or true if the link is handled by the application
-            urlClickCallback?.onUrlClicked(url) == true
+            try {
+                (URL(url))
+                urlClickCallback?.onUrlClicked(url) == true
+            } catch (t: Throwable) {
+                false
+            }
         }
         // We need also to fix the case when long click on link will trigger long click on cell
         it.setOnLinkLongClickListener { tv, url ->
             // Long clicks are handled by parent, return true to block android to do something with url
-            if (urlClickCallback?.onUrlLongClicked(url) == true) {
-                tv.dispatchTouchEvent(MotionEvent.obtain(0, 0, MotionEvent.ACTION_CANCEL, 0f, 0f, 0))
-                true
-            } else {
+            try {
+                (URL(url))
+                if (urlClickCallback?.onUrlLongClicked(url) == true) {
+                    tv.dispatchTouchEvent(MotionEvent.obtain(0, 0, MotionEvent.ACTION_CANCEL, 0f, 0f, 0))
+                    true
+                } else {
+                    false
+                }
+            } catch (t: Throwable) {
                 false
             }
         }

vector/src/main/java/im/vector/riotx/features/html/SpoilerSpan.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2019 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.riotx.features.html
+
+import android.content.Context
+import android.graphics.Color
+import android.text.TextPaint
+import android.text.style.ClickableSpan
+import android.view.View
+import im.vector.riotx.R
+import im.vector.riotx.features.themes.ThemeUtils
+
+class SpoilerSpan(val bgColor: Int, val context: Context) : ClickableSpan() {
+
+    override fun onClick(widget: View) {
+        isHidden = !isHidden
+        widget.invalidate()
+    }
+
+    var isHidden = true
+
+    override fun updateDrawState(tp: TextPaint) {
+        tp.bgColor = bgColor
+        if (isHidden) {
+            tp.color = Color.TRANSPARENT
+        } else {
+            tp.color = ThemeUtils.getColor(context, R.attr.riotx_text_primary)
+        }
+    }
+}