If it's a single char, there is no need to use replaceAll, which uses a regular expression. Assuming "H is the character you want to replace":
String line=testingarray.get(index).toString();
String cleanLine = line.replace("H", "");
update (after edit):
since you already have an int array of unicodes you want to remove (i'm assuming the Integers are decimal value of the unicodes):
String line=testingarray.get(index).toString();
int uniCodes[] = {1611,1614,1615,1616,1617,1618};
StringBuilder regexPattern = new StringBuilder("[");
for (int uniCode : uniCodes) {
regexPattern.append((char) uniCode);
}
regexPattern.append("]");
String result = line.replaceAll(regexPattern.toString(), "");