为什么JSON不返回立陶宛字符

Question

我有一个程序从MySQL数据库中获取字符串，使用相同的字符串创建SqlLite数据库，然后在Android应用程序ListView中显示它们。

问题是，当我从PHP方面得到回复时，它将立陶宛字符显示为“？”，但我使用

  

JSON_UNESCAPED_UNICODE

在json_encode函数中。问题在哪里？

我想提一下MySql unicode设置为“utf8_lithuanian_ci”

PHP文件：

include_once 'db_functions.php';
    $db = new DB_Functions();
    $users = $db->getMarsrutaiCount();
    $a = array();
    $b = array();
    if ($users != false){
        $no_of_users = mysqli_num_rows($users);
        while ($row = mysqli_fetch_array($users)) {     
            $b["id"] = $row["id"];
            $b["marsrutas"] = $row["marsrutas"];
            $b["pasirinkimas_id"] = $row["pasirinkimas_id"];
            array_push($a,$b);
        }
        echo json_encode($a, JSON_UNESCAPED_UNICODE);
    }

Android方面的JSON响应：

ArrayList<HashMap<String, String>> usersynclist;
        usersynclist = new ArrayList<HashMap<String, String>>();
        // Create GSON object
        Gson gson = new GsonBuilder().create();
        try {
            // Extract JSON array from the response
            JSONArray arr = new JSONArray(response);
            System.out.println(arr.length());
            // If no of array elements is not zero
            if(arr.length() != 0){
                // Loop through each array element, get JSON object which has userid and username
                for (int i = 0; i < arr.length(); i++) {
                    // Get JSON object
                    if(veiksmas == 1) {
                        JSONObject obj = (JSONObject) arr.get(i);
                        System.out.println(obj.get("id"));
                        System.out.println(obj.get("marsrutas"));
                        System.out.println(obj.get("pasirinkimas_id"));
                        // DB QueryValues Object to insert into SQLite
                        queryValues = new HashMap<String, String>();
                        // Add userID extracted from Object
                        queryValues.put("id", obj.get("id").toString());
                        // Add userName extracted from Object
                        queryValues.put("marsrutas", obj.get("marsrutas").toString());
                        queryValues.put("pasirinkimas_id", obj.get("pasirinkimas_id").toString());
                        // Insert User into SQLite DB
                        controller.insertMarsrutas(queryValues);