How to make randomize data without repeatation on ClikListener

I'm sorry my english is bad, I can't speak english well. I want to make randomize question. On my layout there's an imageView and a button. An imageView will replace with a question which located in my server, and a button for the next question. I made randomize question in my php. But everytime I clicked next Button, some question showing again, it's because everytime I clicked next Button, it will execute the randomize php. My question is, how to make next button without execute randomize php ?

It's my php code :

<?php
$host="localhost";
$username="root";
$password="";

mysql_connect($host,$username,$password);

$database_name="db_ipa";
mysql_select_db($database_name);

$arr = array();
$q = mysql_query("select * from biologi order by rand() limit 10");
    while ($row = mysql_fetch_assoc($q)) {
        $temp = array(
            "no" => $row['no'],
            "soal"=>$row['soal'],
        );
        array_push($arr, $temp);
    }   
$data = json_encode($arr);
$data = str_replace("\\", "", $data);
echo "$data";
?>

It's my onClick method :

public void next(View v){
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);
    JSONParser jParser = new JSONParser();
    String url ="http://ift.tt/1FGsdAi";
    String json = jParser.makeHttpRequestPOSTNew(url);
    Log.d("json", json);

    ImageView img1 = (ImageView) findViewById(R.id.imageView1);
    try {
        JSONArray jArray = new JSONArray(json);
        StringBuffer str[] = new StringBuffer[jArray.length()];

        for(int i=0;i<=10;i++){

            if(i==10){
                Intent intent = new Intent(getApplicationContext(), Nilai.class);
                startActivity(intent);
            }
            str[i] = new StringBuffer();

            JSONObject soal = jArray.getJSONObject(i);

            String sSoal = soal.getString("soal");


            img1.setImageBitmap(BitmapFactory.decodeStream((InputStream) new URL("http://ift.tt/1J6B6XW" + sSoal).getContent()));

        }


    } catch (Exception e) {
        // TODO: handle exception
    }
}