render MarkDown link.

rocket-chat-android-widgets/src/main/java/chat/rocket/android/widget/helper/Linkify.java

 package chat.rocket.android.widget.helper;
 
-import android.content.ClipData;
-import android.content.ClipboardManager;
-import android.content.Context;
-import android.content.Intent;
-import android.net.Uri;
 import android.text.SpannableString;
 import android.text.Spanned;
-import android.text.style.ClickableSpan;
-import android.view.View;
 import android.widget.TextView;
-import android.widget.Toast;
 import org.nibor.autolink.LinkExtractor;
 import org.nibor.autolink.LinkSpan;
 import org.nibor.autolink.LinkType;
@@ -41,33 +33,10 @@ public class Linkify {
       final int idx2 = link.getEndIndex();
       final String url = text.subSequence(idx1, idx2).toString();
 
-      spannableString.setSpan(createLinkSpan(url), idx1, idx2, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+      spannableString.setSpan(MarkDown.createLinkSpan(url), idx1, idx2,
+          Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
     }
 
     return spannableString;
   }
-
-  private static ClickableSpan createLinkSpan(final String url) {
-    return new ClickableSpan() {
-      @Override
-      public void onClick(View view) {
-        final Context context = view.getContext();
-        try {
-          Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
-          intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-          context.startActivity(intent);
-          return;
-        } catch (Exception exception) {
-        }
-
-        try {
-          ClipboardManager clipboardManager =
-              (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
-          clipboardManager.setPrimaryClip(ClipData.newPlainText("linkURL", url));
-          Toast.makeText(context, "Copied to clipboard", Toast.LENGTH_SHORT).show();
-        } catch (Exception exception) {
-        }
-      }
-    };
-  }
 }
\ No newline at end of file

rocket-chat-android-widgets/src/main/java/chat/rocket/android/widget/helper/MarkDown.java

 package chat.rocket.android.widget.helper;
 
+import android.content.ClipData;
+import android.content.ClipboardManager;
+import android.content.Context;
+import android.content.Intent;
 import android.graphics.Typeface;
+import android.net.Uri;
 import android.text.SpannableString;
 import android.text.Spanned;
 import android.text.style.AbsoluteSizeSpan;
+import android.text.style.ClickableSpan;
 import android.text.style.StrikethroughSpan;
 import android.text.style.StyleSpan;
+import android.view.View;
 import android.widget.TextView;
+import android.widget.Toast;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -22,6 +30,8 @@ public class MarkDown {
   public static void apply(TextView textView) {
     SpannableString text = new SpannableString(textView.getText());
     removeImage(text);
+    highlightLink1(text);
+    highlightLink2(text);
     bold(text);
     italic(text);
     strike(text);
@@ -39,6 +49,31 @@ public class MarkDown {
     }
   }
 
+  private static void highlightLink1(SpannableString inputText) {
+    Pattern linkPattern = Pattern.compile(
+        "\\[([^\\]]+)\\]\\(((?:http|https):\\/\\/[^\\)]+)\\)", Pattern.MULTILINE);
+    final Matcher matcher = linkPattern.matcher(inputText);
+    while (matcher.find()) {
+      ClickableSpan span = createLinkSpan(matcher.group(2));
+      setSpan(span, inputText,
+          matcher.start(), matcher.end(),
+          1, matcher.group(2).length() + 3);
+    }
+  }
+
+  private static void highlightLink2(SpannableString inputText) {
+    Pattern linkPattern = Pattern.compile(
+        "(?:<|&lt;)((?:http|https):\\/\\/[^\\|]+)\\|(.+?)(?=>|&gt;)(?:>|&gt;)", Pattern.MULTILINE);
+    Matcher matcher = linkPattern.matcher(inputText);
+    while (matcher.find()) {
+      ClickableSpan span = createLinkSpan(matcher.group(2));
+      setSpan(span, inputText,
+          matcher.start(), matcher.end(),
+          matcher.group(1).length() + matcher.group(2).length() + 1,
+          matcher.group(5).length() + matcher.group(6).length());
+    }
+  }
+
   private static void bold(SpannableString inputText) {
     Pattern boldPattern = Pattern.compile(
         "(^|&gt;|[ >_~`])(\\*{1,2})[^\\*\\r\\n]+(\\*{1,2})([<_~`]|\\B|\\b|$)", Pattern.MULTILINE);
@@ -96,4 +131,28 @@ public class MarkDown {
           Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
     }
   }
+
+  /*package*/ static ClickableSpan createLinkSpan(final String url) {
+    return new ClickableSpan() {
+      @Override
+      public void onClick(View view) {
+        final Context context = view.getContext();
+        try {
+          Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
+          intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+          context.startActivity(intent);
+          return;
+        } catch (Exception exception) {
+        }
+
+        try {
+          ClipboardManager clipboardManager =
+              (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
+          clipboardManager.setPrimaryClip(ClipData.newPlainText("linkURL", url));
+          Toast.makeText(context, "Copied to clipboard", Toast.LENGTH_SHORT).show();
+        } catch (Exception exception) {
+        }
+      }
+    };
+  }
 }