package org.fest.assertions.api.android;

import java.util.List;

public final class Utils {
  public static String join(List<String> parts) {
    StringBuilder builder = new StringBuilder();
    for (String part : parts) {
      if (builder.length() > 0) {
        builder.append(", ");
      }
      builder.append(part);
    }
    return builder.toString();
  }

  private Utils() {
    // No instances.
  }
}

@@ -35,16 +35,47 @@
 droid;%0A%0A
+import android.text.TextUtils;%0A
 import j
@@ -89,16 +89,16 @@
 l.List;%0A
-
 %0Apublic 
@@ -175,219 +175,41 @@
     
-StringBuilder builder = new StringBuilder();%0A    for (String part : parts) %7B%0A      if (builder.length() %3E 0) %7B%0A        builder.append(%22, %22);%0A      %7D%0A      builder.append(part);%0A    %7D%0A    return builder.toString(
+return TextUtils.join(%22, %22, parts
 );%0A 

Change custom String joiner to use framework one.