How to store Hindi text in MySQL from Android?

I get?????? in MySQL instead of Hindi text. I have the following code to get Hindi text from edittext and send to PHP page that is meant to store my text.

My activity

public class MainActivity extends Activity {
     EditText s;
     Button b1;
      private JSONObject jsonObject=null;
      List<NameValuePair> nameValuePairs;
           ProgressDialog dialog = null;


         @Override
        protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        s=(EditText)findViewById(R.id.editText1);
       b1=(Button)findViewById(R.id.btn);
       Typeface tf = Typeface.createFromAsset(getAssets(), "akshar.ttf");               

     s.setTypeface(tf);


     b1.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {

        Toast.makeText(getApplicationContext(), ""+s.getText(), Toast.LENGTH_SHORT).show();
            new GetAllPosts().execute();
        }
    });
}


private class GetAllPosts extends AsyncTask<Void, Void, Void> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected Void doInBackground(Void... arg0) {
        ServiceHandler sh = new ServiceHandler();
            List<NameValuePair> params   = new ArrayList<NameValuePair>(2);
            params.add(new BasicNameValuePair("text",""+s.getText()));

            jsonObject = sh.makeServiceCall("http://192.168.24.12/temp/v1/temp.php", ServiceHandler.POST, params);
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
    }
}

}