Try using following code :
try {
    JSONArray jsonArray = new JSONArray(response);
    JSONObject jsonObject = jsonArray.get(0);
    JSONObject _id = jsonObject.getJSONObject("_id");
    String old = _id.getString("$oid");
    String member_id = jsonObject.getString("member_id");
    String sensor_name = jsonObject.getString("sensor_name");
    String value = jsonObject.getString("value");
   String date = jsonObject.getString("date");
}catch(JSONException e){
}
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solved How to parse a JSON string in Android?