MainActivity.java

// method to loop through results trying to find a number
private int getNumberFromResult(ArrayList<String> results) {
    for (String str : results) {
        if (getIntNumberFromText(str) != -1) {
            return getIntNumberFromText(str);
        }
    }
    return -1;
}

// method to convert string number to integer
private int getIntNumberFromText(String strNum) {
    switch (strNum) {
        case "zero":
            return 0;
        case "one":
            return 1;
        case "two":
            return 2;
        case "three":
            return 3;
        case "four":
            return 4;
        case "five":
            return 5;
        case "six":
            return 6;
        case "seven":
            return 7;
        case "eight":
            return 8;
        case "nine":
            return 9;
    }
    return -1;
}