如何在 JSON android 中引用特定项目？

我正在关注 android 中的 JSON 教程。我设法将文件中的 JSON 输出到ListView. 但是，我不太明白如何引用特定项目。这是json文件：

    {
  "contacts": [
    {
      "id": "c200",
      "name": "Ravi Tamada",
      "email": "[email protected]",
      "address": "xx-xx-xxxx,x - street, x - country",
      "gender" : "male",
      "phone": {
        "mobile": "+91 0000000000",
        "home": "00 000000",
        "office": "00 000000"
      }
    },
    {
      "id": "c201",
      "name": "Figaro",
      "email": "[email protected]",
      "address": "xx-xx-xxxx,x - street, x - country",
      "gender" : "male",
      "phone": {
        "mobile": "+91 0000000000",
        "home": "00 000000",
        "office": "00 000000"
      }
    },
    {
      "id": "c202",
      "name": "Johnny Depp",
      "email": "[email protected]",
      "address": "xx-xx-xxxx,x - street, x - country",
      "gender" : "female",
      "phone": {
        "mobile": "+91 0000000000",
        "home": "00 000000",
        "office": "00 000000"
      }
    }
  ]
}

第一件事：如何仅输出“性别 = 男性”等项目？第二件事：每当我在我的 .Ravi Tamada 上按下例如时，我ListView怎样才能让它只加载它的移动设备？换句话说，如何在我按下的项目和应该显示的信息之间设置链接，同时考虑到它与按下的项目的关系？

这就是我从 json 中检索项目的方式：

 switch (view.getId()){

            case R.id.button1:
                loadmyjson();
                try {
                    JSONObject jsonObj = new JSONObject(jsonString);

                    JSONArray letters = jsonObj.getJSONArray("contacts");
                    for (int i = 0; i < letters.length(); i++){
                        JSONObject first = letters.getJSONObject(i);
                        String gender = first.getString("gender");
                        Log.e("and that means", " " + gender);

                        if (first.getString("name") == "Figaro"){
                            where.add(gender);


                        }

                         }

                } catch (JSONException e) {
                    e.printStackTrace();
                }
                Log.e("and that means", " " + where);

                break;

        }

问题是这个 if 语句总是错误的。