Show text with only few emojis in bigger

vector/src/main/java/im/vector/riotredesign/core/utils/DimensionUtils.kt

@@ -28,4 +28,12 @@ object DimensionUtils {
                 context.resources.displayMetrics
         ).toInt()
     }
+
+    fun spToPx(sp: Int, context: Context): Int {
+        return TypedValue.applyDimension(
+                TypedValue.COMPLEX_UNIT_SP,
+                sp.toFloat(),
+                context.resources.displayMetrics
+        ).toInt()
+    }
 }

vector/src/main/java/im/vector/riotredesign/core/utils/Emoji.kt

@@ -0,0 +1,69 @@
+package im.vector.riotredesign.core.utils
+
+import java.util.regex.Pattern
+
+private val emojisPattern = Pattern.compile("((?:[\uD83C\uDF00-\uD83D\uDDFF]" +
+        "|[\uD83E\uDD00-\uD83E\uDDFF]" +
+        "|[\uD83D\uDE00-\uD83D\uDE4F]" +
+        "|[\uD83D\uDE80-\uD83D\uDEFF]" +
+        "|[\u2600-\u26FF]\uFE0F?" +
+        "|[\u2700-\u27BF]\uFE0F?" +
+        "|\u24C2\uFE0F?" +
+        "|[\uD83C\uDDE6-\uD83C\uDDFF]{1,2}" +
+        "|[\uD83C\uDD70\uD83C\uDD71\uD83C\uDD7E\uD83C\uDD7F\uD83C\uDD8E\uD83C\uDD91-\uD83C\uDD9A]\uFE0F?" +
+        "|[\u0023\u002A\u0030-\u0039]\uFE0F?\u20E3" +
+        "|[\u2194-\u2199\u21A9-\u21AA]\uFE0F?" +
+        "|[\u2B05-\u2B07\u2B1B\u2B1C\u2B50\u2B55]\uFE0F?" +
+        "|[\u2934\u2935]\uFE0F?" +
+        "|[\u3030\u303D]\uFE0F?" +
+        "|[\u3297\u3299]\uFE0F?" +
+        "|[\uD83C\uDE01\uD83C\uDE02\uD83C\uDE1A\uD83C\uDE2F\uD83C\uDE32-\uD83C\uDE3A\uD83C\uDE50\uD83C\uDE51]\uFE0F?" +
+        "|[\u203C\u2049]\uFE0F?" +
+        "|[\u25AA\u25AB\u25B6\u25C0\u25FB-\u25FE]\uFE0F?" +
+        "|[\u00A9\u00AE]\uFE0F?" +
+        "|[\u2122\u2139]\uFE0F?" +
+        "|\uD83C\uDC04\uFE0F?" +
+        "|\uD83C\uDCCF\uFE0F?" +
+        "|[\u231A\u231B\u2328\u23CF\u23E9-\u23F3\u23F8-\u23FA]\uFE0F?))")
+
+/**
+ * Test if a string contains emojis.
+ * It seems that the regex [emoji_regex]+ does not work.
+ * Some characters like ?, # or digit are accepted.
+ *
+ * @param str the body to test
+ * @return true if the body contains only emojis
+ */
+fun containsOnlyEmojis(str: String?): Boolean {
+    var res = false
+
+    if (str != null && str.isNotEmpty()) {
+        val matcher = emojisPattern.matcher(str)
+
+        var start = -1
+        var end = -1
+
+        while (matcher.find()) {
+            val nextStart = matcher.start()
+
+            // first emoji position
+            if (start < 0) {
+                if (nextStart > 0) {
+                    return false
+                }
+            } else {
+                // must not have a character between
+                if (nextStart != end) {
+                    return false
+                }
+            }
+            start = nextStart
+            end = matcher.end()
+        }
+
+        res = -1 != start && end == str.length
+    }
+
+    return res
+}
+

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

@@ -16,10 +16,7 @@
 
 package im.vector.riotredesign.features.home.room.detail.timeline.item
 
-import android.text.Spannable
 import android.view.View
-import android.widget.ImageView
-import android.widget.TextView
 import androidx.appcompat.widget.AppCompatTextView
 import androidx.core.text.PrecomputedTextCompat
 import androidx.core.text.toSpannable
@@ -28,6 +25,8 @@ import com.airbnb.epoxy.EpoxyAttribute
 import com.airbnb.epoxy.EpoxyModelClass
 import im.vector.matrix.android.api.permalinks.MatrixLinkify
 import im.vector.riotredesign.R
+import im.vector.riotredesign.core.utils.DimensionUtils
+import im.vector.riotredesign.core.utils.containsOnlyEmojis
 import im.vector.riotredesign.features.html.PillImageSpan
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
@@ -47,12 +46,21 @@ abstract class MessageTextItem : AbsMessageItem<MessageTextItem.Holder>() {
     override fun bind(holder: Holder) {
         super.bind(holder)
         MatrixLinkify.addLinkMovementMethod(holder.messageView)
-        val textFuture = PrecomputedTextCompat.getTextFuture(message ?: "",
+
+        val msg = message ?: ""
+        if (msg.length <= 4 && containsOnlyEmojis(msg.toString())) {
+            holder.messageView.textSize = 44F
+        } else {
+            holder.messageView.textSize = 14F
+        }
+
+        val textFuture = PrecomputedTextCompat.getTextFuture(msg,
                 TextViewCompat.getTextMetricsParams(holder.messageView),
                 null)
+
         holder.messageView.setTextFuture(textFuture)
         holder.messageView.renderSendState()
-        holder.messageView.setOnClickListener (clickListener)
+        holder.messageView.setOnClickListener(clickListener)
         holder.messageView.setOnLongClickListener(longClickListener)
         findPillsAndProcess { it.bind(holder.messageView) }
     }