android 取出中间文本

private String getCenText(String resData, String pattern1, String pattern2) {
        String playUrl;
        playUrl = resData.substring(resData.indexOf(pattern1));
        playUrl = playUrl.replace(pattern1, "");
        playUrl = playUrl.substring(0,playUrl.indexOf(pattern2));
        return playUrl;
    }

String playUrl = "";
            
                String pattern1 = "playAddr: \"";
                String pattern2 = "\"";
              
                playUrl = getCenText(resData, pattern1, pattern2);
                Log.e(TAG, "onResponse:playUrl " + playUrl);